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Quantum vector DC magnetometry via selective phase accumulation

Science China(Physics,Mechanics & Astronomy) 2024年第10期67卷 12-22页

作者： Min Zhuang Sijie Chen Jiahao Huang chaohong lee Institute of Quantum Precision Measurement State Key Laboratory of Radio Frequency Heterogeneous IntegrationCollege of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area(Guangdong) Shenzhen 518045China Laboratory of Quantum Engineering and Quantum Metrology School of Physics and AstronomySun Yat-sen University(Zhuhai Campus)Zhuhai 519082China

Precision measurement of magnetic fields is a crucial issue in both fundamental scientific research and practical sensing *** sensitive detection of a vector magnetic field poses a significant challenge in quantum magnetometry,particularly in estimating a vector DC magnetic field with high ***,we propose a comprehensive protocol for quantum vector DC magnetometry,utilizing selective phase accumulation in both non-entangled and entangled quantum *** upon the principles of Ramsey interferometry,our protocol enables the selective accumulation of phase for a specific magnetic field component by incorporating a meticulously designed pulse *** the individual measurement scheme,we employ three individual quantum interferometries to independently estimate each of the three magnetic field ***,in the simultaneous measurement scheme,the application of a pulse sequence along different directions enables the simultaneous estimation of all three magnetic field components using only one quantum ***,by employing an entangled state(such as the Greenberger-Horne-Zeilinger state)as the input state,the measurement precisions of all three components may reach the Heisenberg *** study not only establishes a general protocol for measuring vector magnetic fields using quantum probes,but also presents a viable pathway for achieving entanglement-enhanced multi-parameter estimation.

关键词： magnetometry quantum interferometry entanglement-enhanced quantum metrology

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Compact magneto-optical traps using planar optics

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Chinese Physics B 2024年第9期33卷 93-108页

作者： Zhi Tan Bo Lu Chengyin Han chaohong lee Institute of Quantum Precision Measurement State Key Laboratory of Radio Frequency Heterogeneous IntegrationCollege of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area(Guangdong) Shenzhen 518045China

Magneto-optical traps (MOTs) composed of magnetic fields and light fields have been widely utilized to cool andconfine microscopic particles. Practical technology applications require miniaturized MOTs. The advancement of planaroptics has promoted the development of compact MOTs. In this article, we review the development of compact MOTs basedon planar optics. First, we introduce the standardMOTs. We then introduce the gratingMOTs with micron structures, whichhave been used to build cold atomic clocks, cold atomic interferometers, and ultra-cold sources. Further, we introducethe integrated MOTs based on nano-scale metasurfaces. These new compact MOTs greatly reduce volume and powerconsumption, and provide new opportunities for fundamental research and practical applications.

关键词： magneto-optical trap (MOT) planar optics grating MOT metasurface MOT

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Magnetic field stabilization system designed for the cold-atom coherent population-trapping clock

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CHINESE OPTICS LETTERS 2024年第8期22卷 080202-080202页

作者： Zhan, Chang Ma, Zhu Wu, Jiatao Li, Maojie Han, Chengyin Lu, Bo lee, chaohong Sun Yat Sen Univ Zhuhai Campus Sch Phys & Astron Lab Quantum Engn & Quantum Metrol Zhuhai 519082 Peoples R China Shenzhen Univ Inst Quantum Precis Measurement State Key Lab Radio Frequency Heterogeneous Integr Shenzhen 518060 Peoples R China Shenzhen Univ Coll Phys & Optoelect Engn Shenzhen 518060 Peoples R China Quantum Sci Ctr Guangdong Hong Kong Macao Greater Hong Kong 518045 Peoples R China

Accurate control of magnetic fields is crucial for cold-atom experiments, often necessitating custom-designed control systems due to limitations in commercially available power supplies. Here, we demonstrate precise and flexible control of a static magnetic field by employing a field-programmable gate array and a feedback loop. This setup enables us to maintain exceptionally stable current with a fractional stability of 1 ppm within 30 s. The error signal of the feedback loop exhibited a noise level of 10(-5) A. Hz(-1/2) for control bandwidths below 10 kHz. Utilizing this precise magnetic field control system, we investigate the second-order Zeeman shift in the context of cold-atom coherent population-trapping (CPT) clocks. Our analysis reveals the second-order Zeeman coefficient to be 574.21 Hz/G(2), with an uncertainty of 1.36 Hz/G(2). Consequently, the magnetic field stabilization system we developed allows us to achieve a second-order Zeeman shift below 10(-14), surpassing the long-term stability of current cold-atom CPT clocks.

关键词： cold-atom coherent popualtion-trapping clock Zeeman coefficient magnetic field stabilization system

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Quantum exceptional points of non-Hermitian Hamiltonian and Liouvillian in dissipative quantum Rabi model

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Chinese Physics B 2021年第11期30卷 233-239页

作者： Xianfeng Ou Jiahao Huang chaohong lee Guangdong Provincial Key Laboratory of Quantum Metrology and Sensing&School of Physics and Astronomy Sun Yat-Sen University(Zhuhai Campus)Zhuhai 519082China State Key Laboratory of Optoelectronic Materials and Technologies Sun Yat-Sen University(Guangzhou Campus)Guangzhou 510275China Synergetic Innovation Center for Quantum Effects and Applications Hunan Normal UniversityChangsha 410081China

The open quantum system can be described by either a Lindblad master equation or a non-Hermitian Hamiltonian(NHH).However,these two descriptions usually have different exceptional points(EPs),associated with the degeneracies in the open quantum ***,considering a dissipative quantum Rabi model,we study the spectral features of EPs in these two descriptions and explore their *** find that,although the EPs in these two descriptions are usually different,the EPs of NHH will be consistent with the EPs of master equation in the weak coupling ***,we find that the quantum Fisher information(QFI),which measures the statistical distance between quantum states,can be used as a signature for the appearance of *** study may give a theoretical guidance for exploring the properties of EPs in open quantum systems.

关键词： dissipative quantum Rabi model non-Hermitian Hamiltonian Lindblad master equation exceptional points

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New designed helical resonator to improve measurement accuracy of magic radio frequency

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Chinese Physics B 2022年第9期31卷 268-272页

作者： Tian Guo Peiliang Liu chaohong lee Guangdong Provincial Key Laboratory of Quantum Metrology and Sensing&School of Physics and Astronomy Sun Yat-Sen University(Zhuhai Campus)Zhuhai 519082China State Key Laboratory of Optoelectronic Materials and Technologies Sun Yat-Sen University(Guangzhou Campus)Guangzhou 510275China

Based upon the new designed helical resonator,the resonant radio frequency(RF)for trapping ions can be consec-utively adjusted in a large range(about 12 MHz to 29 MHz)with high Q-factors(above 300).We analyze the helical resonator with a lumped element circuit model and find that the theoretical results fit well with the experimental *** our resonator system,the resonant frequency near magic RF frequency(where the scalar Stark shift and the second-order Doppler shift due to excess micromotion cancel each other)can be continuously changed at kHz *** ^(88)Sr^(+) ion,compared to earlier results,the measurement accuracy of magic RF frequency can be improved by an order of magnitude upon rough calculation,and therefore the net micromotion frequency shifts can be further ***,the differential static scalar polarizability △α0 of clock transition can be experimentally measured more accurately.

关键词： trapped ions helical resonator magic radio frequency precision measurements

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Cluster mean-field study of spinor Bose-Hubbard ladder:Ground-state phase diagram and many-body population dynamics

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Chinese Physics B 2021年第2期30卷 95-102页

作者： Li Zhang Wenjie Liu Jiahao Huang chaohong lee Guangdong Provincial Key Laboratory of Quantum Metrology and Sensing&School of Physics and Astronomy Sun Yat-Sen University(Zhuhai Campus)Zhuhai 519082China State Key Laboratory of Optoelectronic Materials and Technologies Sun Yat-Sen University(Guangzhou Campus)Guangzhou 510275China

We present a cluster mean-field study for ground-state phase diagram and many-body dynamics of spin-1 bosons confined in a two-chain Bose-Hubbard ladder(BHL).For unbiased BHL,we find superfluid(SF)phase and integer filling Mott insulator(Int MI)*** biased BHL,in addition to the SF and Int MI phases,there appears half-integer filling Mott insulator(HInt MI)*** phase transition between the SF and Int MI phases can be first order at a part of phase boundaries,while the phase transition between the SF and HInt MI phases is always second *** tuning the bias energy,we report on the change of the nature of SF-MI phase ***,we study the effect of the spin-dependent interaction on the many-body population *** spin-dependent interaction can lead to rich dynamical behaviors,but does not influence the particle transfer *** results indicate a way to tune the nature of the SF-MI phase transition and open a new avenue to study the many-body dynamics of spinor bosons in optical lattices.

关键词： spinor Bose gases superfluid-Mott insulator phase transition Landau-Zener dynamics

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Experimental demonstration of nonlinear quantum metrology with optimal quantum state

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Science Bulletin 2018年第8期63卷 469-476页

作者： Xinfang Nie Jiahao Huang Zhaokai Li Wenqiang Zheng chaohong lee Xinhua Peng Jiangfeng Du CAS Key Laboratory of Microscale Magnetic Resonance and Department of Modern Physics University of Science and Technology of China Hefei National Laboratory for Physical Sciences at Microscale University of Science and Technology of China Synergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of China Laboratory of Quantum Engineering and Quantum Metrology School of Physics and Astronomy Sun Yat-sen University (Zhuhai Campus) Center for Optics and Optoelectronics Research College of Science Zhejiang University of Technology State Key Laboratory of Optoelectronic Materials and Technologies Sun Yat-sen University (Guangzhou Campus) Synergetic Innovation Center for Quantum Effects and Applications Hunan Normal University

Nonlinear quantum metrology may exhibit better precision scalings. For example, the uncertainty of an estimated phase may scale as △φ∝ 1/N2 under quadratic phase accumulation, which is 1/N times smal-ler than the linear counterpart, where N is probe number. Here, we experimentally demonstrate the non-linear quantum metrology by using a spin-I（I 〉 1/2） nuclear magnetic resonance （NMR） ensemble that can be mapped into a system ofN = 2I spin-1/2 particles and the quadratic interaction can be utilized for the quadratic phase accumulation. Our experimental results show that the phase uncertainty can scale as △φ∝1/（N2-1） by optimizing the input states, when N is an odd number. In addition, the interferomet-tic measurement with quadratic interaction provides a new way for estimating the quadrupolar coupling strength in an NMR system. Our system may be further extended to exotic nonlinear quantum metrology with higher order many-body interactions.

关键词： Quantum information Quantum simulation Quantum metrology Quantum Fisher information Nuclear magnetic resonance Quadrupolar nuclei

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Quantum coherence~ correlations and dynamics of ultracold atoms： From fundamental research to future technology

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Frontiers of physics 2012年第1期7卷 1-2页

作者： chaohong lee (1) Peter D. Drummond (2) Masahito Ueda (3) 1. State Key Laboratory of Optoelectronic Materials and Technologies School of Physics and Engineering Sun Yat-Sen University Guangzhou 510275 China2. Centre for Atom Optics and Ultrafast Spectroscopy Swinburne University of Technology Melbourne 3122 Australia3. Department of Physics University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-0033 Japan

Coherence and correlation are at. the heart of all quantum sciences The emerging quan- tum technologies crucially depend on exot, ic coherence and correlations that cannot, be found in classical systems, To realize qu... 详细信息

关键词： Quantum coherence correlations future technology

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Nonlinear quantum interferometry with Bose condensed atoms

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Frontiers of physics 2012年第1期7卷 109-130页

作者： chaohong lee (1) Jiahao Huang (1) Haiming Deng (1) Hui Dai (1) Jun Xu (1) 1. State Key Laboratory of Optoelectronic Materials and Technologies School of Physics and Engineering Sun Yat-Sen University Guangzhou 510275 China

In quantum interferometry, it is vital to control and utilize nonlinear interactions for the achievement of high-precision measurements. Due to their long coherence time and high controllability, ultracold atoms including Bose condensed atoms have been widely used for quantum interferometry. Here, we review recent progress in theoretical studies of quantum interferometry with Bose condensed atoms. In particular, we focus on nonlinear phenomena induced by atom-atom interactions, and how to control and utilize these nonlinear phenomena. With a mean-field description, due to atom-atom interactions, matter-wave solitons appear in the interference patterns, and macroscopic quantum self-trapping exists in Bose-Josephson junctions. With a many-body description, atom-atom in- teractions can generate non-classical entanglement, which can be utilized to achieve high-precision measurements beyond the standard quantum limit.

关键词： nonlinear quantum interferometry Bose Einstein condensate Bose-Josephson junction

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Tunable photon blockade with a single atom in a cavity under electromagnetically induced transparency

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Photonics Research 2021年第7期9卷 1226-1233页

作者： JING TANG YUANGANG DENG chaohong lee Guangdong Provincial Key Laboratory of Quantum Metrology and Sensing&School of Physics and Astronomy Sun Yat-sen University(Zhuhai Campus)Zhuhai 519082China State Key Laboratory of Optoelectronic Materials and Technologies Sun Yat-sen University(Guangzhou Campus)Guangzhou 510275China Synergetic Innovation Center for Quantum Effects and Applications Hunan Normal UniversityChangsha 410081China

We present an experimental proposal to achieve a strong photon blockade by employing electromagnetically induced transparency (EIT) with a single alkaline-earth-metal atom trapped in an optical cavity. In the presence of optical Stark shift,both the second-order correlation function and cavity transmission exhibit asymmetric structures between the red and blue sidebands of the cavity. For a weak control field,the photon quantum statistics for the coherent transparency window (i.e.,atomic quasi-dark-state resonance) are insensitive to the Stark shift,which should also be immune to the spontaneous emission of the excited state by taking advantage of the intrinsic dark-state polariton of EIT. Interestingly,by exploiting the interplay between the Stark shift and control field,the strong photon blockade at atomic quasi-dark-state resonance has an optimal second-order correlation function g(2)(0)-10-4 and a high cavity transmission simultaneously. The underlying physical mechanism is ascribed to the Stark shift enhanced spectrum anharmonicity and the EIT hosted strong nonlinearity with loss-insensitive atomic quasi-dark-state resonance,which is essentially different from the conventional proposal with emerging Kerr nonlinearity in cavity-EIT. Our results reveal a new strategy to realize high-quality single photon sources,which could open up a new avenue for engineering nonclassical quantum states in cavity quantum electrodynamics.

关键词： transparency photon quantum

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