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Lea Segner (ETH Zรผrich)07/08/2025, 16:30Poster
The n2EDM experiment at the Paul Scherrer Institute is a fundamental particle physics experiment which aims to measure the neutron electric dipole moment with a sensitivity below $1 \times 10^{-27}$โฏeยทcm. Achieving this level of sensitivity requires exact control of magnetic field uniformity to reduce systematic effects. To this end, an array of 112 optically pumped cesium vapor magnetometers...
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Ms Maike Schmidt (1. Department of Imaging Neuroscience, UCL Queen Square Institute of Neurology, University College London, London, UK)07/08/2025, 16:30Poster
Optically Pumped MagnetoEncephaloSpinography (OP-MSEG) offers a promising new avenue for concurrent non-invasive imaging of spinal cord and brain activity. However, the accuracy of source localisation in the cord critically depends on the quality of the forward model; particularly given the spinal cord's complex geometry, deep location, and conductive environment. In this study, we evaluate...
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Lea Segner (ETH Zรผrich), Luz Sanchez-Real Zielniewicz (ETH Zurich)07/08/2025, 16:35Poster
The n2EDM experiment at the Paul Scherrer Institut aims to probe the neutron electric dipole moment with a sensitivity below 10$^{-27}$ $e\cdot$$\mathrm{cm}$, requiring an exceptionally clean magnetic environment. To identify minuscule magnetic impurities that could introduce false EDM signals, we developed a mobile gradiometer based on optically pumped cesium magnetometers in the Mx...
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Peter Koss (Fraunhofer IPM)07/08/2025, 16:35Poster
This contribution reports on a new spray-coating approach for magnetic shielding materials aimed at improved low-frequency field measurements with optically pumped magnetometers. Building on earlier investigations, we have successfully spray coated pure iron and Invar onto Aluminum substrates, and ongoing work explores spray coating of mu-metal. A 3-axis Helmholtz coil setup in a magnetically...
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Dr Martin Rosner (Bundeswehr Technical Center for Ships and Naval Weapons, Maritime Technology and Research (WTD 71))07/08/2025, 16:40Poster
Until now, highly sensitive optically pumped magnetometers (OPMs) have mainly been used in shielded environments under strictly controlled laboratory conditions. However, for a continuous dissemination of this technology and the development of additional areas of application and research, it will be essential to adapt it to more challenging environments.
In particular, the maritime domain...
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Yujian Ma (Beihang University)07/08/2025, 16:45Poster
Optically pumped magnetometers (OPMs) offer significant advantages for biomagnetic measurements such as magnetoencephalography (MEG), owing to their high sensitivity, room-temperature operation, and potential for wearable configurations. In these applications, gradiometric measurement serves as an effective method to suppress common-mode environmental noise. However, it is difficult to make...
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Julen Eccleston Etxeberria (University of Nottingham)07/08/2025, 16:45Poster
Background: Magnetic Induction Tomography (MIT) is an electromagnetic imaging technique that maps a materialโs electrical conductivity by inducing eddy currents via a primary oscillating magnetic field. The resulting secondary magnetic fields from the eddy currents are measured for image reconstruction and object characterisation. Performing MIT on low-conductivity samples (e.g. human tissue,...
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Naoki Umetani (Shimadzu Corporation)07/08/2025, 16:50Poster
Sensitivity Improvement of a $^4$He Optically Pumped Magnetometer in the RF band
N. Umetani$^{1}$, Y. Fujimoto$^1$, K. Shinada$^1$, J. Saikawa$^1$, T. Munaka$^1$, and T. Kobayashi$^2$
$^1$Technology Research Laboratory, Shimadzu Corporation, Soraku-gun, Kyoto, Japan*
$^2$HBRC, Graduate School of Medicine, Kyoto University, Sakyo-ku, Kyoto, Japan***High-sensitivity...
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Jeremias Gutekunst (Fraunhofer IPM)07/08/2025, 16:50Poster
We have developed a magnetic field camera for detecting defects in metal components and battery imaging.
Our approach leverages the high sensitivity and robustness of free-spin-precession (FSP) and Mz magnetometry, combined with a fast, commercial camera operating at up to 90kHz.
Unlike current state-of-the-art optically pumped magnetometers (OPM), which record single or few data...
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Dr Stephanie Mellor (1. Spinal Cord Injury Center, Balgrist University Hospital, University of Zurich, Zurich, Switzerland 2. Translational Neuromodeling Unit, Institute for Biomedical Engineering, University of Zurich & ETH Zurich, Zurich, Switzerland)07/08/2025, 16:55Poster
A key motivator for the adoption of OPMs for neural recordings is that they allow recordings from multiple different electrophysiological sources simultaneously. Simultaneous recording from the brain (MEG) and spinal cord (MSG) has recently garnered interest [1,2], as it has the potential to facilitate research into cortico-spinal connectivity, furthering our understanding of sensorimotor...
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Marvin Kessler (Physikalisch-Technische Bundesanstalt), Dr Ingo Hilschenz (light & matter Group, Institute for Solid State Physics, Leibniz University Hanover, Germany)07/08/2025, 16:55Poster
A novel approach for the fabrication of glass-based atomic vapor cells is presented, combining laser-assisted glass structuring and a hermetic glass joining technique. The structure of these glass-based cells includes three glass chips stacked on top of each other, with the central chip containing interconnected cavities. Glass structuring using selective laser-induced etching (SLE) process...
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Jie Zheng (School of Instrumentation and Optoelectronic Engineering, Beihang University, Beijing, 100191, China; Hangzhou Innovation Institute, Beihang University, Hangzhou, 310051, Zhejiang, China; Hefei National Laboratory, Hefei, 230088, Anhui, China)07/08/2025, 17:00Poster
Enhancing the interaction strength between light and atoms amplifies the Faraday rotation effect, thereby improving the measurement sensitivity of optical rotation detection. This work integrates a multi-reflection cavity into the vapor cell of the SERF co-magnetometer for the first time, increasing the interaction strength between light and atoms. We establish a model that accounts for light...
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Tim Kรผgler (Leibniz Institute of Photonic Technology, Albert-Einstein-Strasse 9, 07745 Jena, Germany)07/08/2025, 17:00Poster
Alkali vapor cells are at the heart of a variety of atomic systems and quantum sensors, including atomic clocks and gyroscopes, laser frequency references, Rydberg atom-based electric field sensors, and especially for this work, optically pumped magnetometers. In state-of-the-art, wafer-scale vapor cell fabrication technology, the alkali metal is often introduced as a chemical compound into...
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Dr Anna Jodko-Wลadziลska (Warsaw University of Technology, Faculty of Mechatronics, Warsaw, Poland)07/08/2025, 17:05Poster
Auditory Brainstem Response (ABR) testing is currently the only clinical method for objectively determining hearing thresholds by detecting wave V of Auditory Evoked Potentials (AEPs). Its magnetic counterpart, Auditory Evoked Fields (AEFs), offers a promising alternative by identifying the sound pressure level (SPL) at which auditory responses, such as the M100, are detectable.
Whilst...
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Mr JunLin Chen (Beihang University)07/08/2025, 17:05Poster
Junlin Chen$^{a,b}$, Changhao Zhang$^{a,b}$, Jiaqi Yang$^{a,b}$, Zhenglong Lu$^{a,b}$, Haowen Tian$^{a,b}$, Yanchao Chai$^{a,b}$, Yuntian Zou$^{a,b}$, and Liwei Jiang$^{a,b,c}$
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$^{a}$ Institute of Large-scale Scientific Facility and Centre for Zero Magnetic Field Science,
Beihang University, Beijing, 100191, China
$^{b}$ Hangzhou Innovation Institute, Beihang University, Hangzhou, 310051,... -
Yosuke Ito (Kyoto University)07/08/2025, 17:10Poster
Recently, Meta Platforms, Inc. reported that brain-machine interfaces (BMIs) based on magnetoencephalography (MEG) can achieve higher accuracy than those based on electroencephalography (EEG)$^1$. Optically pumped magnetometers (OPMs), which have been actively developed for miniaturization and shield-free measurements, offer a promising noninvasive sensing solution for BMIs. In this study, we...
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Zhenglong Lu (Beihang University)07/08/2025, 17:10Poster
This study investigates the effects of power broadening on nonlinear magneto-optical rotation (NMOR) magnetometers. As the laser power increases, the interference between two partially resolved transitions of 87Rb induced by velocity-changing collisions can be exacerbated by power broadening, resulting in a reduction
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of the rotation rate, and the shift of the optimal laser frequency... -
Syed Mohammad Suhaib (School of Engineering, University of Birmingham)07/08/2025, 17:15Poster
Optically Pumped Magnetometers (OPM) have been a promising technology for magnetometry. Zero-field OPMs have evidenced a capability to measure magnetic fields as small as 10 fT [1] with sensitivity levels ranging from 1 fT/โHz [2]. Moreover, the practical advantages of the OPM include its compact size and independence of the cryogenic environment, unlike SQUID-based magnetometers [3]. These...
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Harini Raghavan (ICFO - The Institute of Photonic Sciences)07/08/2025, 17:15Poster
Miniaturized high-sensitivity OPMs require โ simultaneously โ small volumes, temperature control, magnetic field control, and low magnetic noise. This presents interlinked challenges when designing vapor cells for OPMs. We report a dual-chamber ($4 \times 4 \times 1.5$ mm$^{3}$) low-noise functionalized vapor cell (FVC) and its use in a single-beam SERF OPM. The FVC, made at wafer scale by...
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88. Drone Integration of an Atomic Optically Pumped Magnetometer for Airborne Magnetic Field SensingRuggero Giampaoli (Leibniz University Hannover)07/08/2025, 17:20Poster
We present early results on the integration of a compact, hot-vapor based optically pumped magnetometer (OPM) onto a drone platform for unshielded airborne magnetic sensing. This work is part of a broader effort to develop quantum magnetometry solutions for field applications for geo-prospection and the detection of unexploded ordnance. The system employs an alkali vapour-based OPM operating...
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Ziao Liu (Beihang University)07/08/2025, 17:20Poster
Triaxial spin-exchange relaxation-free (SERF) atomic magnetometers (AMs) provide more comprehensive magnetic field information in bio-magnetic measurements, effectively improving the accuracy of magnetic source reconstruction. Typically, the triaxial AM is considered to be three independent orthogonal single-axis AMs, but the interaction of the triaxial modulation is ignored. This study...
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Mr Yaoguo Wang (Beihang University), Ms Di Zhan (Beihang University)07/08/2025, 17:25Poster
For SERF atomic magnetometer, photo-elastic modulator (PEM) is a commonly-used optical polarimetry technique to detect the weak angle signal due to its high sensitivity. Magnetic field to be measured can be obtained by demodulating the first-harmonic response signal from the photoelectric detector (PD) based on the modulation frequency of PEM. The optical rotation angle contains essential...
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Taylor Christie (Monash University)07/08/2025, 17:25Poster
Four wave mixing is a popular spectroscopic technique with limited examples of use for magnetometry. As an all optical, heterodyne technique, it allows for high sensitivity measurement, without the challenges associated with using RF.
All akali vapours could be used for four wave mixing, however we selected sodium due to having the vapour cell and dye laser readily available in our lab. A...
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Jonathan Dhombridge (Sandia National Laboratories)07/08/2025, 17:30Poster
Optically pumped magnetometers (OPMs) utilizing entangled spins offer the promise of sensing performance beyond the standard quantum limit (SQL). Unfortunately, realizing this advantage has proven exceedingly difficult. Entangled states are inherently tricky to create and maintain. It is often better to simply use many unentangled atoms rather than entangling far fewer of them. Nevertheless,...
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Dr Changhao Zhang (Beihang University)07/08/2025, 17:30Poster
Changhao Zhang$^{1,2,3}$, Junlin Chen$^{1,2,3}$, Zhenglong Lu$^{1,2,3}$, Jiaqi Yang$^{1,2,3}$, Haowen Tian$^{1,2,3}$, Yanchao Chai$^{1,2,3}$, Yuntian Zou$^{1,2,3}$ and Liwei Jiang$^{1,2,3}$
$^1$ Institute of Large-scale Scientific Facility and Centre for Zero Magnetic Field Science, Beihang University, Beijing, 100191, China
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$^2$ Hangzhou Innovation Institute, Beihang University, Hangzhou,... -
Sarvagya Gupta (Balgrist University Hospital)07/08/2025, 17:35Poster
Recording neuromagnetic fields from the spinal cord with Optically Pumped Magnetometers (OPMs) has the potential to offer new insights into spinal cord function. To realise the full potential of OPM based magnetospinography (OPM-MSG), accurate forward models incorporating subject-specific anatomy are required [1]. These models depend on torso and internal organ geometry (heart, lungs, etc.)...
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Taiga Fukushima (Kyoto university)07/08/2025, 17:35Poster
The precision of magnetic field estimation using a scalar-mode optically pumped magnetometerใ(OPM) is significantly degraded in the presence of environmental magnetic noise. Spatial inhomogeneity in the noise magnetic field reduces the transverse relaxation time, resulting in a shorter, noisier free induction decay (FID) signal. To address this issue, we employ a spin echo technique using a...
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Hana Medhat (Institute of Photonic Sciences (ICFO))07/08/2025, 17:40Poster
We investigate the use of optically-addressable nuclear spins in the fermionic isotopes of Mercury (Hg199 and Hg201) for generating macroscopically entangled spin squeezed states [1,2] in hot atomic vapors. We calculate the Wineland spin squeezing parameter [3] under the influence of different atomic loss and spin decoherence sources as well as inhomogeneous atom-light coupling within the...
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Dr Guiying Zhang (Zhejiang University of Technology)07/08/2025, 17:40Poster
Unlike electrical signals, magnetic signals are not affected by the biological tissues because of the nearly homogeneous permeability. Therefore, magnetoencephalography (MEG) is more suitable for detecting biological phenomenon. In the past several decades, superconducting quantum interference device (SQUID) magnetometers are most commonly used for MEG. However, the SQUID magnetometers would...
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Ryo Kinoshita (Kyoto University)07/08/2025, 17:45Poster
In conventional magnetic field estimation using scalar-mode optically pumped magnetometers (OPMs), the goal is to estimate the frequency of a decaying sine curve that best fits a free induction decay (FID) signal. This approach assumes a constant magnetic field during each FID period, limiting its ability to track the temporal dynamics of fields oscillating at high frequencies.
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ใTo overcome... -
Yangzhi Xue (Beihang University)07/08/2025, 17:45Poster
AbstractโSoft magnetic materials, characterized by high magnetic permeability, are typically utilized in the magnetic shields. Among these, a composite shielding system comprising outer layer Permalloy and inner layer manganese-zinc (Mn-Zn) ferrite has demonstrated exceptional performance in providing an extremely-low magnetic interference environment for spin-exchange relaxation-free (SERF)...
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Yao Dou (Beihang University)07/08/2025, 17:50Poster
Abstract๏ผWith the rapid advancement of cutting-edge fields such as quantum precision measurement and biomagnetic sensing, increasingly stringent requirements are being placed on the suppression of ambient magnetic fields. The sensitivity improvement of atomic magnetometers is currently limited by the residual magnetization and intrinsic magnetic noise of conventional soft magnetic shielding...
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Patrick Bevington (National Physical Laboratory)07/08/2025, 17:50Poster
Radio-frequency (rf) atomic magnetometers (AM) can measure oscillating magnetic fields (1 kHz-1 MHz range) with fT/โHz sensitivity and are 2D sensors. Magnetic induction tomography (MIT) measurements require sensitive magnetometers, e.g., for use in the non-destructive testing of pipework and defect detection. Experimental work, verified with COMSOL simulations, shows how changing rf field...
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Shengjie Qi07/08/2025, 17:55Poster
Optically pumped magnetometers (OPMs) based MEG has been widely used in biomagnetic imaging applications with the advantages of closer distance to the scalp, mobile measurements, and high sensitivity. However, it may suffer from angular errors of sensitive axis due to low frequency remnant magnetic fields or magnetic field crosstalk from adjacent sensors, which is determined by the requirement...
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Laszlo Demko (1. Translational Neuromodeling Unit, Institute for Biomedical Engineering, University of Zurich & ETH Zurich, Zurich, Switzerland)07/08/2025, 17:55Poster
Magnetoencephalography (MEG) based on optically pumped magnetometers (OPM-MEG) is a relatively novel method to measure brain activity non-invasively in humans. It offers several advantages over traditional SQUID (superconducting quantum interference device) based MEG and EEG [1-3]. However, its properties, in particular test-retest reliability (stability of measurements in time) and construct...
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Yi-an XU (Beihang University)07/08/2025, 18:00Poster
Molecular Dynamics Optimization of Multilayer OTS SAMs Cells for Enhanced Performance in Single Beam SERF Magnetometers
*Yi-an XU1,2, Yuhao WANG1,2, Ziqian YUE1,2, Zhuangsheng ZHU1,2
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1 School of Instrumentation Science and Opto-electronics Engineering,
Beihang University, Beijing, China
2 Hangzhou Innovation... -
Saixin Zhou (1 School of Instrumentation and Optoelectronic Engineering, Beihang University, Beijing, 100191, China; 2 Hefei National Laboratory, Hefei, 230088, Anhui, China)07/08/2025, 18:00Poster
Spin-exchange relaxation-free (SERF) comagnetometer is significant in exploring fundamental physics and high-precision inertial sensing. However, traditional continuous measurement based on steady atomic spin polarization limits the suppression of long-term drifts, which is pivotal for inertial navigation and the search for new physics beyond standard model.We propose a SERF comagnetometer...
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Yuhao Wang (Beihang University)07/08/2025, 18:05Poster
The modulated single-beam Spin-Exchange Relaxation-Free (SERF) optically pumped magnetometers (OPMs) hold significant promise for applications in biomagnetic measurements. Achieving the SERF regime requires a high atomic number density, which necessitates a stable thermal control system for the vapor cell. Conventionally, the vapor cell temperature is measured by the platinum resistance...
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Fan Wang07/08/2025, 18:05Poster
Comagnetometers have enabled significant progress in searches for physics beyond the standard model and inertial navigation, owing to the ability to substantially suppress magnetic noise. We present a novel type of comagnetometer based on the cooperative coherence transfer (CCT) mechanism [Submitted]. The nonreciprocal coupling is introduced to enable optimized **transfer energy...
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Markus Henttonen (Aalto University)07/08/2025, 18:10Poster
Auditory evoked responses, recorded using electroencephalography or magnetoencephalography (MEG), are commonly used to study cognitive processes related to hearing in humans. These responses have also been recorded in other species but mostly by using invasive techniques. Here, for the first time, we present non-invasive measurements of these responses in unanesthetized domestic cats (Felis...
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Ewan Kennett (University of Nottingham)07/08/2025, 18:10Poster
Background:
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Magnetoencephalography (MEG) systems using optically pumped magnetometers (OPMs) require magnetically shielded rooms (MSRs); typically built from 2โ5 layers of high-permeability material (e.g., MuMetal) and a conductive layer (e.g., copper) to block external magnetic fields. While effective, current MSRs are heavy (2,500โ13,000 kg) and difficult to install (>3 m high),... -
davide sera (Universitร Bari "Aldo Moro")07/08/2025, 18:15Poster
We present the development of a compact and space compatible quantum wideband sensor for radio-frequency (RF) electric fields based on Rydberg atoms in thermal alkali vapor cells.
Rydberg-atom based sensors provide sensitivity to the electric component of RF fields thanks to the high polarizability of excited states.
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Unlike traditional RF antennas, these sensors are self-calibrated via... -
Ronja Rasser07/08/2025, 18:15Poster
We present a zero-field optically pumped magnetometer that utilizes a thin microfabricated vapor cell, offering 16 measurement channels within the same cell. The vapor cell and its thermal insulation have been optimized to minimize the distance between the magnetic sample and the sensing volume, thereby enhancing the effective spatial resolution. Initial measurements indicate that all channels...
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Faming Wang (Beihang University)07/08/2025, 18:20Poster
In SERF atomic magnetometers, the spin polarization of alkali-metal atoms is a critical parameter affecting the signal-to-noise ratio. The signal of the magnetometer is optimal for a particular spin polarization, and higher spatial uniformity of spin polarization enhances the signal. Hybrid optical pumping is a method to improve the spatial uniformity of spin polarization. The signal of the...
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Yanbin Wang (Xi'an Jiaotong University)07/08/2025, 18:20Poster
The miniaturization of optical pumping magnetometer became the focus of research, and the miniaturization of the alkali metal vapor cell is the key to the miniaturization of the atomic magnetometer. The development of micro-electromechanical systems (MEMS) provides the basis for miniaturization of alkali metal vapor cells. The sealing of MEMS vapor cells was mainly realized by anodic bonding,...
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Georgios Vasilakis (Foundation for Research and Technology Hellas)07/08/2025, 18:25Poster
Atomic-optical magnetometers have reached sensitivities where quantum noise becomes a limiting factor. One fundamental quantum noise source is back-action noise, which arises from the coupling between quantum fluctuations in the probe lightโs polarization and the atomic spin ensemble being measured. This back-action can be circumvented by stroboscopically modulating the probe intensity at...
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Peter Schwindt (Sandia National Laboratories)07/08/2025, 18:25Poster
P. D. D. Schwindt$^1$, J. Iivanainen$^1$, J. Dhombridge$^1$, T. S. Read$^1$, D. M. Ridley$^1$, B. J. Little$^1$, T. R. Carter$^1$, J. McKay$^3$, J. Stephen$^4$, S. Taulu$^5$, and A. Borna$^1$
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1 Sandia National Laboratories, Albuquerque, USA
2 University of New Mexico, Albuquerque, USA
3 Candoo Systems,
4 Mind Research Network
5 Institute for Learning and Brain Sciences, University of... -
Christopher Kiehl (ICFO - Institute of Photonic sciences)07/08/2025, 18:30Poster
Nuclear spin-based OPMs offer a path toward advancing sensitive magnetometry by leveraging the long coherence times of nuclear spin ensembles. Mercury (Hg), particularly its odd isotopes, is a promising candidate due to its accessible 254 nm $^1S_0 \rightarrow\ ^3P_1$ optical transition and high vapor pressureโover $10^3$ times that of cesium at room temperatureโenabling large optical depths...
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Dr Michaล Wลadziลski (Warsaw University of Technology, Faculty of Mechatronics, Warsaw, Poland)07/08/2025, 18:30Poster
Magnetically shielded rooms (MSRs) significantly attenuate the ambient magnetic field, making it possible to perform measurements of very low signals. For measurements with optically pumped magnetometers (OPMs), such rooms are, in most cases, essential. In a two-layer magnetically shielded room at the Faculty of Mechatronics, Warsaw University of Technology, the QuSpin Zero-Field Magnetometer...
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Wiebke Pohlandt (Physikalisch-Technische Bundesanstalt)07/08/2025, 18:35Poster
The current method for disseminating the unit Tesla relies on NMR measurements on field polarized proton spins, using water [1]. However, the relative measurement uncertainties are restricted to values between $10^{-4}$ and $10^{-6}$ by limited SNR at fields below 2ย mT and a rather insensitive absorption technique at fields above 10ย mT. To overcome these limitations, we explore the use of...
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Stefan Hartwig (Physikalisch-Technische Bundesanstalt)07/08/2025, 18:35Poster
We report measurements of the bioelectricity of the electrically stimulated abductor digiti minimi (ADM) muscle of the right hand using three types of measurement modalities:
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(1) by recording magnetic flux density with a state of the art zero field optically pumped magnetometer (OPM),
(2) by recording magnetic flux density with a superconducting quantum interference device (SQUID), and
(3)... -
Kuga Uematsu (Kyoto University)07/08/2025, 18:40Poster
Optically pumped magnetometers (OPMs) are highly sensitive sensors that can detect minute biomagnetic fields. However, OPM signals are often degraded by ambient magnetic interference and motion artifacts. To address such noisy signals, we apply independent low-rank matrix analysis (ILRMA), a multichannel blind source separation (BSS) method that leverages the low-rank structure of source power...
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Dr Aaron Jaufenthaler (University of Innsbruck)07/08/2025, 18:40Poster
Operating optically pumped magnetometers (OPMs) in unshielded environments is challenging. The sensors need a high dynamic range of at least several 100 nT to not be saturated by environmental noise (e.g. Mains noise), and a bandwidth of at least 1 kHz in order to avoid aliasing effects. Further, a multichannel system is often desired to allow for model-based spatial noise removal. We aim in...
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Yaqi Zhang (Beihang University)07/08/2025, 18:45Poster
Atomic magnetometry based on the spin-exchange relaxation-free (SERF) effect has emerged as a key technology for high-precision magnetic field measurements due to its ultrahigh sensitivity. A critical factor in enhancing the sensitivity of SERF magnetometers is achieving uniform spin polarization in high-density alkali-metal vapor. However, conventional narrow-linewidth optical pumping often...
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Yasin Taheri Mazinani (University of Bari Aldo Moro)07/08/2025, 18:45Poster
We present a compact optical magnetic gradiometer based on laser-written vapor cells (LWVCs) with a dual-chamber design, aimed at high-sensitivity detection of magnetic field gradients. This system is built around an optically pumped magnetometer (OPM), which enables precise measurements of magnetic variations while rejecting common-mode noiseโan essential feature for operation in unshielded...
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Harry Cook (University of Birmingham)07/08/2025, 18:50Poster
In recent work [1], we showed the efficacy of an intrinsic axial gradiometer for the detection of human biomagnetism. We now present the next generation of this sensor, which employs the nonlinear magneto-optical rotation effect. By using simplified integrated optics, printed circuit boards, and a modular design, we have improved the mechanical rigidity and decreased the standoff from the...
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Dr Haoran Lv (Beihang University)07/08/2025, 18:50Poster
In the research of the interaction between light and atoms, optical ellipticity is a key parameter to characterize the pump and absorption process [1,2]. It was generally believed that ellipticity only originated from the the interaction between magnetic fields and polarized alkali metal atomic ensembles in previous researches [3,4,5]. In this research, a new mechanism of circular dichroism...
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Mr Ruyang Guo (Xi'an Jiaotong University)07/08/2025, 18:55Poster
In mobile magnetoencephalography (MEG) systems, hundreds of atomic magnetometer sensor heads are typically deployed, making the miniaturization of atomic magnetometers essential. The coils used for spin modulation and magneticโfield control are critical components of these devices. Here, using microelectromechanical systems (MEMS) technology, we have designed and fabricated a threeโdimensional...
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Adam Taylor (University of Nottingham)07/08/2025, 18:55Poster
Strict magnetic field control is an integral part of quantum sensors such as optically pumped magnetometers (OPMs). OPMs are used in pioneering research including biomagnetic measurement, which utilises hybrid shielding to provide the low and stable field environment required for precise measurements. Further applications where controlled field environments are required include atom...
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Vito Giovanni Lucivero (University of Bari)07/08/2025, 19:00Poster
We demonstrate atomic spectroscopy and optical magnetometry with picotesla sensitivity using laser-written Rb vapor cells. The technology can be integrated with photonic structures and microfluidic channels in a single platform for lab-on-chip atomic quantum sensing.
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Diana Mendez-Avalos (Institute of Photonic Sciences (ICFO))07/08/2025, 19:00Poster
We describe progress toward quantum enhancement of an optically pumped magnetometer (OPM), operating around Earth's magnetic field. We demonstrate back-action evading scheme with sub-pT/vHz quantum-noise-limited sensitivity, for frequency and amplitude modulation schemes. We also aim to demonstrate the quantum advantage of spin squeezing in highly polarized atomic ensembles within...
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V. Guarrera (University of Birmingham)07/08/2025, 19:05Poster
Miniature atomic vapor cells are a fundamental component in future-focused field-deployable quantum technology development. Here, we explore the physics of diffusive alkali metal-noble gas spin systems magnetization in a mm-sized wafer-fabricated vapor cell, engineered with an eye towards room temperature atomic magnetometry, co-magnetometry and gyroscope setups. Through a systematic survey of...
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Tengyue Long (Beihang University)07/08/2025, 19:05Poster
Optically pumped magnetometers (OPMs) have significantly advanced the field of biomagnetic sensing, particularly in wearable applications such as magnetoencephalography (MEG). Triaxial measurement techniques further enhance the localization accuracy of these systems by capturing full vector information. However, the precision of triaxial OPM measurements is still constrained by two major...
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Wenting Chen (PSI - Paul Scherrer Institut), Nikolaus Stephan Edler von Schickh (PSI - Paul Scherrer Institut), Katia Michielsen (LPSC Grenoble)07/08/2025, 19:10Poster
The n2EDM experiment at the Paul Scherrer Institute searches for the electric dipole moment (EDM) of the neutron with a baseline sensitivity of ~1ร10โปยฒโท eยทcm. Precise monitoring of the average magnetic field experienced by the neutrons is required to guard against systematic shifts on the EDM measurement that cannot be mitigated otherwise. The magnetic field monitoring is achieved using...
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Z. Xiao (School of Electronics, and Center for Quantum Information Technology, Peking University, Beijing, China)07/08/2025, 19:10Poster
The Transient Electromagnetic Method (TEM) has attracted significant interest because of its non-destructive evaluation, rapid response, and environmentally adaptable. In traditional TEM systems, the signal acquisition module generally utilizes multi-turn induction coils. Based on Faradayโs law of electromagnetic induction, these coils detect the secondary eddy currents induced by the primary...
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Xiangdong Zhang (Shenzhen University)Poster
In magnetic resonance experiments, it is widely recognized that a nonuniform magnetic field can lead to an increase in the resonance line width, as well as a reduction in sensitivity and spectral resolution. However, a nonuniform magnetic field can also cause shifts in resonance frequency, which has received far less attention. In this work, we investigate the frequency shift caused by...
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