A5067202795- Atomic and Subatomic Physics Research
- Quantum optics and atomic interactions
- Cold Atom Physics and Bose-Einstein Condensates
- Quantum Information and Cryptography
- Quantum Mechanics and Applications
- Quantum Computing Algorithms and Architecture
- Advanced Frequency and Time Standards
- Advanced MRI Techniques and Applications
- Quantum, superfluid, helium dynamics
- Mechanical and Optical Resonators
- Geophysical and Geoelectrical Methods
- Inertial Sensor and Navigation
- Non-Destructive Testing Techniques
- Radiomics and Machine Learning in Medical Imaging
- Spectroscopy and Laser Applications
- Target Tracking and Data Fusion in Sensor Networks
- Medical Imaging Techniques and Applications
- Magnetic Field Sensors Techniques
- Dark Matter and Cosmic Phenomena
- Random lasers and scattering media
- Advanced Fiber Laser Technologies
- Colorectal Cancer Surgical Treatments
- Optical Network Technologies
- Geophysical Methods and Applications
- Non-Invasive Vital Sign Monitoring
Peking University
2016-2025
Jiamusi University
2024
Shenzhen University
2011-2024
People's Liberation Army 401 Hospital
2024
Chinese People's Liberation Army
2024
Nanopolis Suzhou (China)
2024
Guangzhou Medical University
2019-2022
Zhejiang University of Technology
2017-2022
Air Force Engineering University
2022
Harbin Institute of Technology
2022
We propose a continuous-variable measurement-device-independent quantum key distribution (CV-MDI QKD) protocol, in which detection is conducted by an untrusted third party. Our protocol can defend all detector side channels, seriously threaten the security of practical CV QKD system. Its analysis against arbitrary collective attacks derived based on fact that entanglement-based scheme CV-MDI equivalent to conventional with coherent states and heterodyne detection. find maximal total...
High-sensitivity total-field atomic magnetometer enables brain-activity measurements in unshielded Earth’s field.
Magnetocardiography (MCG), which uses high-sensitivity magnetometers to record magnetic field signals generated by electrical activity in the heart, is a noninvasive method for evaluating heart diseases such as arrhythmia and ischemia. The MCG measurements usually require participant keeping still magnetically shielded room due immovable sensor noisy external environments. These requirements limit applications, exercise tests long-term observations, are useful early detections of diseases....
A continuous-variable measurement-device-independent quantum key distribution (CV-MDI QKD) protocol using squeezed states is proposed where the two legitimate partners send Gaussian-modulated to an untrusted third party realize measurement. Security analysis shows that can not only defend all detector side channels, but also attain higher secret rates than coherent-state-based protocol. We present a method improve squeezed-state CV-MDI QKD by adding proper Gaussian noise reconciliation side....
Abstract Ultralight bosons such as axion-like particles are viable candidates for dark matter. They can form stable, macroscopic field configurations in the of topological defects that could concentrate matter density into many distinct, compact spatial regions small compared with Galaxy but much larger than Earth. Here we report results search transient signals from domain walls by using global network optical magnetometers exotic (GNOME) physics searches. We data, consisting correlated...
Polarization spectroscopy in (4)He around 1083 nm is observed and optimized with a distributed feedback fiber laser applied for frequency stabilization. In order to improve the accuracy long-term stability of frequency-locking performance, power stabilization module added, dependences peak-to-peak amplitude difference (width) polarization signal on various pump probe powers are investigated.
Photon subtraction can enhance the performance of continuous-variable quantum key distribution (CV QKD). However, enhancement effect will be reduced by imperfections practical devices, especially limited efficiency a single-photon detector. In this paper, we propose non-Gaussian postselection method to emulate photon substraction used in coherent-state CV QKD protocols. The virtual not only avoid complexity and photon-subtraction operation, which extends secure transmission distance as ideal...
Searching for beyond-the-standard-model interactions has been of interest in quantum sensing. Here, we demonstrate a method, both theoretically and experimentally, to search the spin- velocity-dependent interaction with an atomic magnetometer at centimeter scale. By probing diffused optically polarized atoms, undesirable effects coming along optical pumping, such as light shifts power-broadening effects, are suppressed, which enables 1.4 fT_{rms}/Hz^{1/2} noise floor reduced systematic...
This paper presents a closed queuing network model to address bike queues in bike-sharing systems with finite docks. The tackles issues of spillover and user attrition due fully occupied docks shortages at stations. objective is determine throughput rates other performance metrics for these systems. To overcome computational challenges, we propose an approximation algorithm based on the developed model. Our analysis reveals intrinsic properties docks: (i) effective system rate increases...
Source noise affects the security of continuous-variable quantum key distribution (CV QKD) and is difficult to analyze. We propose a model characterize Gaussian source through introducing neutral party (Fred) who induces with general unitary transformation. Without knowing Fred's exact state, we derive bounds for both reverse direct reconciliations show that bound reconciliation tight.
Most existing methods used in aeromagnetic compensation assume a constant geomagnetic field. These do not take into consideration the gradient, which can reduce accuracy of estimated coefficients Tolles-Lawson model. In practice, aside from magnetic interference aircraft, residual component field is contained filtered signal. this letter, signal modeled as function longitude, latitude, and altitude aircraft. The linear equation for estimating then extended by combining model with proposed...
Vapor cells with antirelaxation coating are widely used in modern atomic physics experiments due to the coating's ability maintain atoms' spin polarization during wall collisions. We characterize performance of vapor different materials by measuring longitudinal relaxation and density at temperatures up 95 °C. infer that spin-projection-noise-limited sensitivity for magnetometers such improves temperature, which demonstrates potential coated applications future high-sensitivity magnetometers.
The comagnetometer has been one of the most sensitive devices with which to test new physics related spin-dependent interactions, but comagnetometers based on overlapping ensembles multiple spin species usually suffer from systematic errors due magnetic field gradients. Here, we propose a Zeeman transitions dual hyperfine levels in ground-state ^{87}Rb atoms, shows nearly negligible sensitivity variations laser power and frequency, field, We measured hypothetical gravitational energy proton...
The estimating of the Tolles-Lawson model's coefficients plays an important role in aeromagnetic compensation. directional cosines, which are indispensable for coefficients, usually measured by a three-axis strapdown magnetometer general survey system. However, some cases, scalar may have much higher accuracy than magnetometer. This imbalance measurement is then introduced into model and affects estimation coefficients. In this letter, modified to reduce through substituting error...
In aeromagnetic compensation, the multicolinearity of Tolles-Lawson model is one main factors limiting performance coefficient-estimating methods. Aside from intrinsic characteristic model, data filtering as a preprocessing step in estimating coefficients has significant impact on multicolinearity. To solve this problem, an adaptive filter based wavelet multiresolution analysis proposed. By modifying decomposition results Mallat algorithms and reconstructing signal, can be used to establish...
Abstract We demonstrate a single-beam three-axis parametric-resonance magnetometer operated in near-zero fields. By reflecting the incident laser beam at 90° vapor cell and applying three orthogonal parametric modulation fields, components of magnetic field can be extracted from transmitted light signal. Our vector experimentally demonstrates magnetic-field sensitivities 30 fT Hz −1/2 along x - y -axes 70 z -axis, features compact architecture, which is particularly attractive for...
Magnetic-field-gradient-induced spin polarization transverse relaxation is re-examined in an alkali-metal atomic cell with antirelaxation coating. The experimentally observed motional-narrowing effect a paraffin-coated vapor cell, phenomenon for depicting the suppression of caused by magnetic-field gradient, more than order magnitude weaker theoretical predictions. Such discrepancy due to existence background gas. By taking gas into consideration, Redfield theory combined Langevin approach...
In the system of quantum key distribution (QKD), errors may occur in initial keys due to noise or eavesdropping during transmission on channel. The goal information reconciliation is remove these by exchanging messages an authenticated public this paper, we discuss problem secrete (SKR) QKD, analyze cascade protocol used for SKR, then modify it according our conclusion. Experiments have shown that modified much higher efficiency.
The original two-way continuous-variable quantum-key-distribution (CV-QKD) protocols [S. Pirandola, S. Mancini, Lloyd and L. Braunstein, Nat. Phys. 4 (2008) 726] give the security against collective attack on condition of tomography quantum channels. We propose a family new CV-QKD prove their entangling cloner attacks without simulation result indicates that maintain same advantage as whose tolerable excess noise surpasses one-way protocol. also show all sub-protocols within have higher...
The Global Network of Optical Magnetometers to search for Exotic physics (GNOME) is a network geographically separated, time-synchronized, optically pumped atomic magnetometers that being used correlated transient signals heralding exotic physics. GNOME sensitive nuclear- and electron-spin couplings fields from astrophysical sources such as compact dark-matter objects (for example, axion stars domain walls). Properties the sensors sensitivity, bandwidth, noise characteristics are studied in...
A magnetically-quiet environment is important for detecting faint magnetic-field signals or nonmagnetic spin-dependent interactions. Passive magnetic shielding using layers of large magnetic-permeability materials widely used to reduce the noise. The noise can also be actively monitored with magnetometers and then compensated, acting as a complementary method passive shielding. We present here general model quantitatively depict optimize performance active stabilization experimentally verify...
We build and characterize a dual-species all-optical magnetometer based on Cs-K hybrid vapor cell with paraffin coating. Using the amplitude-modulated Bell-Bloom scheme Faraday-rotation measurement, we show that spin polarization of Cs K atoms can be generated detected independently. The noise floor channel is $35\phantom{\rule{0.2em}{0ex}}\mathrm{fT}/\sqrt{\mathrm{Hz}}$, whereas $260\phantom{\rule{0.2em}{0ex}}\mathrm{fT}/\sqrt{\mathrm{Hz}}$, which affected mainly by magnetic resonance...