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学者姓名：杨贞标
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Abstract ：
Investigation of the nonlocality evolution of entangled mesoscopic fields under decoherence not only is important for understanding the quantum-classical transition, but also has relevance to quantum communication and quantum computation protocols based on continuous variables. According to previous formulations of Bell inequalities, the system loses nonlocal features far before the disappearance of entanglement. We here construct a new version of Bell signal based on rotated and displaced on-off correlations, with which the Bell inequality is violated as long as there remains entanglement and the field state components keep quasiorthogonal. Consequently, the nonlocal character revealed by our formulation decays much slower compared with those based on previous ones. More importantly, there exists a wide regime where the Bell inequality is restored with previous formulations but remains to be violated based on our correlation operators.
Keyword ：
Bell inequality Bell inequality entangled mesoscopic fields entangled mesoscopic fields nonlocality evolution nonlocality evolution rotated and displaced on-off correlations rotated and displaced on-off correlations
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| GB/T 7714 | Tan, Zhao-Song , Yang, Shou-Bang , Yang, Zhen-Biao et al. Quantum nonlocality evolution for two entangled mesoscopic fields under decoherence [J]. | COMMUNICATIONS IN THEORETICAL PHYSICS , 2024 , 76 (1) . |
| MLA | Tan, Zhao-Song et al. "Quantum nonlocality evolution for two entangled mesoscopic fields under decoherence" . | COMMUNICATIONS IN THEORETICAL PHYSICS 76 . 1 (2024) . |
| APA | Tan, Zhao-Song , Yang, Shou-Bang , Yang, Zhen-Biao , Zheng, Shi-Biao . Quantum nonlocality evolution for two entangled mesoscopic fields under decoherence . | COMMUNICATIONS IN THEORETICAL PHYSICS , 2024 , 76 (1) . |
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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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Bulk-boundary correspondence (BBC) remains the central topic in modern condensed matter physics and has received a boost of interest with the recent discovery of non-Hermitian skin effects. However, there still exist profound features of BBC that are beyond the existing framework. Here, we report the unexpected behavior of BBC when the Hamiltonian contains terms of the form d0(k)I , which serves as a momentum dependent energy shift. For Hermitian cases, the momentum dependent energy shift can force the system to be metallic, where topological phase transitions can take place with the upper and the lower bands kept untouched. The modified BBC should be reconstructed from the perspective of the indirect band gap. In non-Hermitian cases, skin effects are found to be capable of coexisting with the preserved BBC, of which the process can be greatly facilitated by the complex d0(k)I . Remarkably, such results can be led to a further step, and contrary to the intuition, the modified BBC in Hermitian systems can be restored to be conventional by including extra non-Hermiticity. The physical origin for these phenomena lies in that d0(k)I can drastically change the point gap topology. Finally, the corresponding experimental simulations are proposed via the platforms of electric circuits.
Keyword ：
bulk-boundary correspondence bulk-boundary correspondence double side discontinuous non-Hermitian skin effect double side discontinuous non-Hermitian skin effect momentum dependent energy shift momentum dependent energy shift
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| GB/T 7714 | Wang, Huan-Yu , Yang, Zhen-Biao , Liu, Wu-Ming . Bulk-boundary correspondence in topological systems with the momentum dependent energy shift [J]. | QUANTUM SCIENCE AND TECHNOLOGY , 2024 , 9 (2) . |
| MLA | Wang, Huan-Yu et al. "Bulk-boundary correspondence in topological systems with the momentum dependent energy shift" . | QUANTUM SCIENCE AND TECHNOLOGY 9 . 2 (2024) . |
| APA | Wang, Huan-Yu , Yang, Zhen-Biao , Liu, Wu-Ming . Bulk-boundary correspondence in topological systems with the momentum dependent energy shift . | QUANTUM SCIENCE AND TECHNOLOGY , 2024 , 9 (2) . |
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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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Critical phenomena of quantum systems are useful for enhancement of quantum sensing. However, experimental realizations of criticality enhancement are confined to very few systems, owing to the stringent requirements, including the thermodynamical or scaling limit, and fine control of interacting quantum subsystems or particles. Here, a simple critical quantum sensing scheme is proposed that requires neither of these conditions. The critical system is realized with a single parametrically-driven bosonic mode involving many non-interacting bosons. The quantum Fisher information is calculated, which confirms the criticality-enabled enhancement. The response of one of the quadratures to the variation of the control parameter is further detailed. The numerical results reveal that its inverted variance exhibits a diverging behavior at the critical point. Based on the presently available control techniques of parametric driving, it is expected that scheme can be realized in different systems, e.g., ion traps and superconducting circuits. © 2024 Wiley-VCH GmbH.
Keyword ：
criticality-enhancement criticality-enhancement critical sensing critical sensing quantum fisher information quantum fisher information
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| GB/T 7714 | Chen, K. , Jia-Hao, L.ü. , Zhu, X. et al. Critical Sensing with a Single Bosonic Mode Without Boson–Boson Interactions [J]. | Advanced Quantum Technologies , 2024 . |
| MLA | Chen, K. et al. "Critical Sensing with a Single Bosonic Mode Without Boson–Boson Interactions" . | Advanced Quantum Technologies (2024) . |
| APA | Chen, K. , Jia-Hao, L.ü. , Zhu, X. , Zhang, H.-L. , Ning, W. , Yang, Z.-B. et al. Critical Sensing with a Single Bosonic Mode Without Boson–Boson Interactions . | Advanced Quantum Technologies , 2024 . |
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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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Abstract: Superradiant phase transition and entanglement entropy in the Dicke model with a squeezed light are investigated. We find a special rotation coordinate system mapping the original Hamiltonian into an effective dual-oscillator Hamiltonian in the thermodynamic limit. We analytically derive the eigenenergy and eigenstate of the ground state. The ground state is demonstrated to undergo superradiant phase transition at a nonlinear critical boundary collectively induced by the squeezed driving and qubit-field coupling. This phase boundary requires neither large qubit-field detuning nor strong squeezed driving. An exact expression of the ground-state entropy is obtained. We demonstrate that the squeezed light enhances the qubit-field entanglement entropy linearly. Graphical abstract: (Figure presented.) © The Author(s), under exclusive licence to EDP Sciences, SIF and Springer-Verlag GmbH Germany, part of Springer Nature 2024.
Keyword ：
Entropy Entropy Ground state Ground state Hamiltonians Hamiltonians Phase transitions Phase transitions Quantum entanglement Quantum entanglement Qubits Qubits
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| GB/T 7714 | Shen, Li-Tuo , Pei, Xuan-Tong , Shi, Zhi-Cheng et al. Quantum phase transition and entanglement entropy in the Dicke model with a squeezed light [J]. | European Physical Journal D , 2024 , 78 (7) . |
| MLA | Shen, Li-Tuo et al. "Quantum phase transition and entanglement entropy in the Dicke model with a squeezed light" . | European Physical Journal D 78 . 7 (2024) . |
| APA | Shen, Li-Tuo , Pei, Xuan-Tong , Shi, Zhi-Cheng , Yang, Zhen-Biao . Quantum phase transition and entanglement entropy in the Dicke model with a squeezed light . | European Physical Journal D , 2024 , 78 (7) . |
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We study the ground state of the two-qubit squeezed Rabi model. Two special transformations are found to diagonalize the system Hamiltonian when each qubit's frequency is close to the field frequency, where both the squeezing and counterrotating-wave interactions are removed, leading to an effective integrable Hamiltonian. The analytical ground state is determined and matches with numerical solutions well for a range of squeezing strengths and qubit-field detunings in the ultrastrong-coupling regime. We demonstrate that the ground state exhibits a firstorder quantum phase transition at a phase boundary linearly induced by the squeezed light. We characterize the two-qubit negativity analytically and find that its two-qubit entanglement increases with the increasing squeezing strength nonlinearly. The average photon numbers of the field mode and variances of position and momentum quadratures are also analyzed and discovered to have a nonlinear relation with the squeezing strength. Finally, we discuss the experimental scheme and realization possibility of the predicted results. (c) 2024 Optica Publishing Group
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| GB/T 7714 | Pei, Xuan-Tong , Shi, Zhi-Cheng , Shen, Li-Tuo et al. First-order quantum phase transition in the two-qubit squeezed Rabi model [J]. | JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS , 2024 , 41 (6) : 1373-1380 . |
| MLA | Pei, Xuan-Tong et al. "First-order quantum phase transition in the two-qubit squeezed Rabi model" . | JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS 41 . 6 (2024) : 1373-1380 . |
| APA | Pei, Xuan-Tong , Shi, Zhi-Cheng , Shen, Li-Tuo , Yang, Zhen-Biao . First-order quantum phase transition in the two-qubit squeezed Rabi model . | JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS , 2024 , 41 (6) , 1373-1380 . |
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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 non-analytic 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 ε and phase ϕ. The results reveal that with the increase in ε, the system undergoes a quantum phase transition from the normal to the symmetry-breaking phase, with the critical point unaffected by ϕ. 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. © 2024 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.
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| GB/T 7714 | Zhang, H.-L. , Lü, J.-H. , Chen, K. et al. Critical quantum geometric tensors of parametrically-driven nonlinear resonators [J]. | Optics Express , 2024 , 32 (13) : 22566-22577 . |
| MLA | Zhang, H.-L. et al. "Critical quantum geometric tensors of parametrically-driven nonlinear resonators" . | Optics Express 32 . 13 (2024) : 22566-22577 . |
| APA | Zhang, H.-L. , Lü, J.-H. , Chen, K. , Yu, X.-J. , Wu, F. , Yang, Z.-B. et al. Critical quantum geometric tensors of parametrically-driven nonlinear resonators . | Optics Express , 2024 , 32 (13) , 22566-22577 . |
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