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学者姓名：吴凡
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Abstract ：
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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Parametrically driven nonlinear resonators represent a building block for realizing fault -tolerant quantum computation and are useful for critical quantum sensing. From a fundamental viewpoint, the most intriguing feature of such a system is perhaps the critical phenomena, which can occur without interaction with any other quantum system. The nonanalytic behaviors of its eigenspectrum have been substantially investigated, but those associated with the ground state wavefunction have largely remained unexplored. Using the quantum ground state geometric tensor as an indicator, we comprehensively establish a phase diagram involving the driving parameter epsilon and phase 0 . The results reveal that with the increase in epsilon , the system undergoes a quantum phase transition from the normal to the symmetry -breaking phase, with the critical point unaffected by 0 . Furthermore, the critical exponent and scaling dimension are obtained by an exact numerical method, which is consistent with previous works. Our numerical results show that the phase transition falls within the universality class of the quantum Rabi model. This work reveals that the quantum metric and Berry curvature display diverging behaviors across the quantum phase transition. (c) 2024 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement
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| GB/T 7714 | Zhang, Hao-long , Lu, Jia-hao , Chen, Ken et al. Critical quantum geometric tensors of parametrically-driven nonlinear resonators [J]. | OPTICS EXPRESS , 2024 , 32 (13) : 22566-22577 . |
| MLA | Zhang, Hao-long et al. "Critical quantum geometric tensors of parametrically-driven nonlinear resonators" . | OPTICS EXPRESS 32 . 13 (2024) : 22566-22577 . |
| APA | Zhang, Hao-long , Lu, Jia-hao , Chen, Ken , Yu, Xue-jia , Wu, Fan , Yang, Zhen-biao et al. Critical quantum geometric tensors of parametrically-driven nonlinear resonators . | OPTICS EXPRESS , 2024 , 32 (13) , 22566-22577 . |
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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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Abstract ：
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.
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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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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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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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Owing to the presence of exceptional points (EPs), non-Hermitian (NH) systems can display intriguing topological phenomena without Hermitian analogs. However, experimental characterizations of exceptional topological invariants have been restricted to second-order EPs (EP2s) in classical or semiclassical systems. We here propose an NH multi-mode system with higher-order EPs, each of which is underlain by a multifold-degenerate multipartite entangled eigenstate. We implement the NH model by controllably coupling a Josephson-junction-based electronic mode to two microwave resonators. We experimentally quantify the topological invariant for an EP3, by mapping out the complex eigenspectra of the tripartite system along a loop surrounding this EP3 in the parameter space. The nonclassicality of the realized topology is manifested by the observed quantum correlations in the corresponding eigenstates. Our results extend research of exceptional topology to fully quantum-mechanical models with multipartite entangled eigenstates. Exceptional topology associated with higher-order exceptional points has not been completely characterised in quantum systems. Here, the authors fill this gap performing full quantum state tomography in a system composed of a superconducting qubit coupled to two cavities, one lossless and one lossy, featuring third-order exceptional points.
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| GB/T 7714 | Han, Pei-Rong , Ning, Wen , Huang, Xin-Jie et al. Measuring topological invariants for higher-order exceptional points in quantum three-mode systems [J]. | NATURE COMMUNICATIONS , 2024 , 15 (1) . |
| MLA | Han, Pei-Rong et al. "Measuring topological invariants for higher-order exceptional points in quantum three-mode systems" . | NATURE COMMUNICATIONS 15 . 1 (2024) . |
| APA | Han, Pei-Rong , Ning, Wen , Huang, Xin-Jie , Zheng, Ri-Hua , Yang, Shou-Bang , Wu, Fan et al. Measuring topological invariants for higher-order exceptional points in quantum three-mode systems . | NATURE COMMUNICATIONS , 2024 , 15 (1) . |
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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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