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学者姓名：吴凡
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Abstract ：
Quantum operations by utilizing the underlying geometric phases produced in physical systems are favoured due to their potential robustness. When a system in a non-degenerate eigenstate undergoes an adiabatically cyclic evolution dominated by its Hamiltonian, it will get a geometric phase, referred to as the Berry Phase. While a non-adiabatically cyclic evolution produces an Aharonov-Anandan geometric phase. The two types of Abelian geometric phases are extended to the non-Abelian cases, where the phase factors become matrix-valued and the transformations associated with different loops are non-commutable. Abelian and non-Abelian (holonomic) operations are prevalent in discrete variable systems, whose limited (say, two) energy levels, form the qubit. While their developments in continuous systems have also been investigated, mainly due to that, bosonic modes (in, such as, cat states) with large Hilbert spaces, provide potential advantages in fault-tolerant quantum computation. Here we propose a feasible scheme to realize non-adiabatic holonomic quantum logic operations in continuous variable systems with cat codes. We construct arbitrary single-qubit (two-qubit) gates with the combination of single- and two-photon drivings applied to a Kerr Parametric Oscillator (KPO) (the coupled KPOs). Our scheme relaxes the requirements of the previously proposed quantum geometric operation strategies in continuous variable systems, providing an effective way for quantum control.
Keyword ：
cat qubit cat qubit continuous variable systems continuous variable systems non-Abelian non-Abelian
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| GB/T 7714 | Zhang, Hao-Long , Kang, Yi-Hao , Wu, Fan et al. Non-adiabatic holonomic quantum operations in continuous variable systems [J]. | SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY , 2024 , 67 (6) . |
| MLA | Zhang, Hao-Long et al. "Non-adiabatic holonomic quantum operations in continuous variable systems" . | SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY 67 . 6 (2024) . |
| APA | Zhang, Hao-Long , Kang, Yi-Hao , Wu, Fan , Yang, Zhen-Biao , Zheng, Shi-Biao . Non-adiabatic holonomic quantum operations in continuous variable systems . | SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY , 2024 , 67 (6) . |
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Spontaneous symmetry breaking (SSB) plays a central role in understanding a large variety of phenomena associated with phase transitions, such as superfluid and superconductivity. So far, the transition from a symmetric vacuum to a macroscopically ordered phase has been substantially explored. The process bridging these two distinct phases is critical to understanding how a classical world emerges from a quantum phase transition, but so far remains unexplored in experiment. We here report an experimental demonstration of such a process with a quantum Rabi model engineered with a superconducting circuit. We move the system from the normal phase to the superradiant phase featuring two symmetry-breaking field components, one of which is observed to emerge as the classical reality. The results demonstrate that the environment-induced decoherence plays a critical role in the SSB.
Keyword ：
quantum phase transition quantum phase transition Rabi model Rabi model Schrodinger cat states Schrodinger cat states spontaneous symmetry breaking spontaneous symmetry breaking superconducting circuit superconducting circuit
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| GB/T 7714 | Ning, Wen , Zheng, Ri-Hua , Lue, Jia-Hao et al. Experimental observation of spontaneous symmetry breaking in a quantum phase transition [J]. | SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY , 2024 , 67 (2) . |
| MLA | Ning, Wen et al. "Experimental observation of spontaneous symmetry breaking in a quantum phase transition" . | SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY 67 . 2 (2024) . |
| APA | Ning, Wen , Zheng, Ri-Hua , Lue, Jia-Hao , Wu, Fan , Yang, Zhen-Biao , Zheng, Shi-Biao . Experimental observation of spontaneous symmetry breaking in a quantum phase transition . | SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY , 2024 , 67 (2) . |
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We systematically characterize the dynamical evolution of time-parity (PT)-symmetric two-level systems with spin-dependent dissipations. If the control parameters of the gap are linearly tuned with time, the dynamical evolution can be characterized with parabolic cylinder equations which can be analytically solved. We find that the asymptotic behaviors of particle probability on the two levels show initial-state-independent redistribution in the slow-tuning-speed limit as long as the system is nonadiabatically driven across exceptional points. Equal distributions appear when the nondissipative Hamiltonian shows gap closing. As long as the nondissipative Hamiltonian displays level anticrossing, the final distribution becomes unbalanced. The ratios between the occupation probabilities are given analytically. These results are confirmed with numerical simulations. The predicted equal-distribution phenomenon may be used to identify the closing of the energy gap from anticrossing between two energy bands.
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| GB/T 7714 | Pan, Jian-Song , Wu, Fan . Nonadiabatic transitions in non-Hermitian PT-symmetric two-level systems [J]. | PHYSICAL REVIEW A , 2024 , 109 (2) . |
| MLA | Pan, Jian-Song et al. "Nonadiabatic transitions in non-Hermitian PT-symmetric two-level systems" . | PHYSICAL REVIEW A 109 . 2 (2024) . |
| APA | Pan, Jian-Song , Wu, Fan . Nonadiabatic transitions in non-Hermitian PT-symmetric two-level systems . | PHYSICAL REVIEW A , 2024 , 109 (2) . |
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Understanding the dynamical behavior of a qubit in a reservoir is critical to applications in quantum technological protocols, ranging from quantum computation to quantum metrology. The effect of the reservoir depends on the reservoir's spectral structure as well as on the qubit-reservoir coupling strength. We here propose a measure for quantifying the non-Markovian effect of a reservoir with a Lorentzian spectrum, based on the maximum qubit-reservoir quantum entanglement that can be extracted. Numerical simulation shows that this entanglement exhibits a monotonous behavior in response to the variation of the coupling strength. We confirm the validity of this measure with an experiment where a superconducting qubit is controllably coupled to a lossy resonator, which acts as a reservoir for the qubit. The experimental results illustrate that the maximal extractable entanglement is progressively increased with the strengthening of non-Markovianity. © 2024 Author(s).
Keyword ：
Petroleum reservoir evaluation Petroleum reservoir evaluation Quantum electronics Quantum electronics Quantum entanglement Quantum entanglement Quantum optics Quantum optics Qubits Qubits Superconducting resonators Superconducting resonators
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| GB/T 7714 | Han, Pei-Rong , Wu, Fan , Huang, Xin-Jie et al. Characterization of non-Markovianity with maximal extractable qubit-reservoir entanglement [J]. | Applied Physics Letters , 2024 , 125 (12) . |
| MLA | Han, Pei-Rong et al. "Characterization of non-Markovianity with maximal extractable qubit-reservoir entanglement" . | Applied Physics Letters 125 . 12 (2024) . |
| APA | Han, Pei-Rong , Wu, Fan , Huang, Xin-Jie , Wu, Huai-Zhi , Yi, Wei , Wen, Jianming et al. Characterization of non-Markovianity with maximal extractable qubit-reservoir entanglement . | Applied Physics Letters , 2024 , 125 (12) . |
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A Kerr nonlinear oscillator (KNO) supports a pair of steady eigenstates, coherent states with opposite phases, that are good for the encoding of continuous variable qubit basis states. Arbitrary control of the KNO confined within the steady-state subspace allows extraction of the Berry curvature through the linear response of the physical observable to the quench velocity of the system, providing an effective method for the characterization of topology in the KNO. As an alternative, the control adopting the 'shortcut to adiabaticity' to the KNO enables the exploration of the topology through accelerated adiabatic eigenstate evolution to measure all 3 physical observables. Topological transitions are revealed by the jump of the first Chern number, obtained respectively from the integral of the Berry curvature and of the new polar angle relation, over the whole parameter space. Our strategy paves the way for measuring topological transitions in continuous variable systems. © 2024 Juan Lin et al.
Keyword ：
Eigenvalues and eigenfunctions Eigenvalues and eigenfunctions Magnetic moments Magnetic moments Optical Kerr effect Optical Kerr effect Oscillators (mechanical) Oscillators (mechanical) Oscillistors Oscillistors Quantum electronics Quantum electronics Quantum optics Quantum optics Topology Topology
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| GB/T 7714 | Lin, Juan , Yang, Shou-Bang , Wu, Fan et al. Topological Transitions in a Kerr Nonlinear Oscillator [J]. | Intelligent Computing , 2024 , 3 . |
| MLA | Lin, Juan et al. "Topological Transitions in a Kerr Nonlinear Oscillator" . | Intelligent Computing 3 (2024) . |
| APA | Lin, Juan , Yang, Shou-Bang , Wu, Fan , Yang, Zhen-Biao . Topological Transitions in a Kerr Nonlinear Oscillator . | Intelligent Computing , 2024 , 3 . |
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We investigate the quantum phase transition in the anisotropic Dicke model through an examination of the quantum geometric tensor of the ground state. In this analysis, two distinct classical limits exhibit their unique anisotropic characteristics. The classical spin limit demonstrates a preference for the rotating-wave coupling, whereas the classical oscillator limit exhibits symmetry in the coupling strength of the bias. The anisotropic features of the classical spin limit persist at finite scales. Furthermore, we observe that the interplay among the anisotropic ratio, spin length, and frequency ratio can collectively enhance the critical behaviors. This critical enhancement without a trade-off between these factors provides a flexible method for quantum precision measurement.
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| GB/T 7714 | Zhu, Xin , Lu, Jia-Hao , Ning, Wen et al. Quantum geometric tensor and critical metrology in the anisotropic Dicke model [J]. | PHYSICAL REVIEW A , 2024 , 109 (5) . |
| MLA | Zhu, Xin et al. "Quantum geometric tensor and critical metrology in the anisotropic Dicke model" . | PHYSICAL REVIEW A 109 . 5 (2024) . |
| APA | Zhu, Xin , Lu, Jia-Hao , Ning, Wen , Shen, Li-Tuo , Wu, Fan , Yang, Zhen-Biao . Quantum geometric tensor and critical metrology in the anisotropic Dicke model . | PHYSICAL REVIEW A , 2024 , 109 (5) . |
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A scheme for measuring topological properties in a two-photon-driven Kerr-nonlinear (KNR) resonator subjected to a single-photon modulation is proposed. The topological properties are revealed through the observation of the Berry curvature and hence the first Chern number, as a nonadiabatic response of the physical observable to the change rate of the control parameter of the modulated drive. The parameter manifold, constructed from the system's Hamiltonian that determines its dynamics constrained in the state space spanned by the even and odd cat states as two basis states, is adjusted so that the degeneracy crossing the manifold indicates a topological transition. The scheme, with such continuous variable states in mesoscopic systems, provides a new perspective for exploration of the geometry and the related topology with complex systems.
Keyword ：
cat-qubit cat-qubit continuous variable systems continuous variable systems first Chern number first Chern number
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| GB/T 7714 | Wang, Bi-Yao , Zhang, Hao-Long , Yang, Shou-Bang et al. Scheme for Measuring Topological Transitions in a Continuous Variable System [J]. | ADVANCED QUANTUM TECHNOLOGIES , 2023 , 6 (6) . |
| MLA | Wang, Bi-Yao et al. "Scheme for Measuring Topological Transitions in a Continuous Variable System" . | ADVANCED QUANTUM TECHNOLOGIES 6 . 6 (2023) . |
| APA | Wang, Bi-Yao , Zhang, Hao-Long , Yang, Shou-Bang , Wu, Fan , Yang, Zhen-Biao , Zheng, Shi-Biao . Scheme for Measuring Topological Transitions in a Continuous Variable System . | ADVANCED QUANTUM TECHNOLOGIES , 2023 , 6 (6) . |
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Quantum systems that undergo quantum phase transitions exhibit divergent susceptibility and can be exploited as probes to estimate physical parameters. We generalize the dynamic framework for criticality-enhanced quantum sensing by the quantum Rabi model (QRM) to its anisotropic counterpart and derive the correspondingly analytical expressions for the quantum Fisher information (QFI). We find that the contributions of the rotating-wave and counterrotating-wave interaction terms are symmetric at the limit of the infinite ratio of qubit frequency to field frequency, with the QFI reaching a maximum for the isotropic QRM. At finite frequency scaling, we analytically derive the inverted variance of higher-order correction and find that it is more affected by the rotating-wave coupling than by the counterrotating-wave coupling.
Keyword ：
anisotropic quantum Rabi model anisotropic quantum Rabi model quantum Fisher information quantum Fisher information quantum sensing quantum sensing
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| GB/T 7714 | Zhu, Xin , Lue, Jia-Hao , Ning, Wen et al. Criticality-enhanced quantum sensing in the anisotropic quantum Rabi model [J]. | SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY , 2023 , 66 (5) . |
| MLA | Zhu, Xin et al. "Criticality-enhanced quantum sensing in the anisotropic quantum Rabi model" . | SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY 66 . 5 (2023) . |
| APA | Zhu, Xin , Lue, Jia-Hao , Ning, Wen , Wu, Fan , Shen, Li-Tuo , Yang, Zhen-Biao et al. Criticality-enhanced quantum sensing in the anisotropic quantum Rabi model . | SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY , 2023 , 66 (5) . |
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Lithium-sulfur (Li-S) batteries have gained widespread attention owing to their high theoretical energy density and low cost. However, the commercial application of these batteries is hindered by the severe shuttle effect and slow redox reaction kinetics of polysulfides. In this study, a hierarchically porous membrane consisting of CoSe2 nanoparticle-decorated carbon nanofibers containing carbon nanotubes (CoSe2@CNF/CNT) is constructed as a self-supported sulfur host for Li-S batteries. The hierarchical conductive network of CNFs/CNTs with N-doped porous carbon facilitates electron/ion transport and provides sufficient space to mitigate the volume expansion of lithium polysulfides (LiPSs). Moreover, the modified CoSe2 nanoparticles serve as both chemical trappers and electrocatalysts, chemically anchoring LiPSs and accelerating the redox kinetics to inhibit the shuttle effect. As a result, an initial specific discharge capacity of 1098.8 mA h g(-1) is achieved at 1 C. Importantly, the cathode exhibits superior cycling stability with a capacity decay rate as low as 0.06% over 500 cycles. This work offers a feasible approach to designing multi-functional sulfur hosts for high-energy-density Li-S batteries.
Keyword ：
catalytic conversion catalytic conversion chemical adsorption chemical adsorption CoSe2 nanoparticles CoSe2 nanoparticles hierarchical carbon nanofibers hierarchical carbon nanofibers lithium-sulfur batteries lithium-sulfur batteries
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| GB/T 7714 | Ao, Juan , Xie, Yonghui , Lai, Yunda et al. CoSe2 nanoparticles-decorated carbon nanofibers as a hierarchical self-supported sulfur host for high-energy lithium-sulfur batteries [J]. | SCIENCE CHINA-MATERIALS , 2023 , 66 (8) : 3075-3083 . |
| MLA | Ao, Juan et al. "CoSe2 nanoparticles-decorated carbon nanofibers as a hierarchical self-supported sulfur host for high-energy lithium-sulfur batteries" . | SCIENCE CHINA-MATERIALS 66 . 8 (2023) : 3075-3083 . |
| APA | Ao, Juan , Xie, Yonghui , Lai, Yunda , Yang, Ming , Xu, Jing , Wu, Fan et al. CoSe2 nanoparticles-decorated carbon nanofibers as a hierarchical self-supported sulfur host for high-energy lithium-sulfur batteries . | SCIENCE CHINA-MATERIALS , 2023 , 66 (8) , 3075-3083 . |
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In this work the dressed -molecule theory is used to describe the two-dimensional quantum anomaly of breathing mode in a recent experimental system [M. Holten et al., Phys. Rev. Lett. 121, 120401 (2018); T. Peppler et al., Phys. Rev. Lett. 121, 120402 (2018)]. With the aid of a beyond -mean -field Gaussian pair fluctuation theory, we employ the dressed -molecule states to characterize the axial excited states and the Feshbach molecular states and propose a low -energy effective theory. We show that, in the whole crossover from a BCS superfluid to a Bose-Einstein condensate, our theory can describe the two-dimensional experimental systems precisely in the low -energy region. We explain the puzzling experimental observations of the smaller than expected breathing -mode frequency. Our establishment of the dressed -molecule theory for two-dimensional fermions can help in the understanding of the conformal anomaly in quasi -low -dimensional quantum systems.
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| GB/T 7714 | Wu, Fan , Hu, Jian-Shen , He, Lianyi . Dressed-molecule theory for the quasi-two-dimensional quantum anomaly [J]. | PHYSICAL REVIEW A , 2023 , 108 (6) . |
| MLA | Wu, Fan et al. "Dressed-molecule theory for the quasi-two-dimensional quantum anomaly" . | PHYSICAL REVIEW A 108 . 6 (2023) . |
| APA | Wu, Fan , Hu, Jian-Shen , He, Lianyi . Dressed-molecule theory for the quasi-two-dimensional quantum anomaly . | PHYSICAL REVIEW A , 2023 , 108 (6) . |
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