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学者姓名：郑仕标
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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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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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The experimental observation of quantum phase transitions predicted by the quantum Rabi model in quantum critical systems is usually challenging due to the lack of signature experimental observables associated with them. Here, we describe a method to identify the dynamical critical phenomenon in the quantum Rabi model consisting of a three-level atom and a cavity at the quantum phase transition. Such a critical phenomenon manifests itself as a sudden change of steady-state output photons in the system driven by two classical fields, when both the atom and the cavity are initially unexcited. The process occurs as the high-frequency pump field is converted into the low-frequency Stokes field and multiple cavity photons in the normal phase, while this conversion cannot occur in the superradiant phase. The sudden change of steady-state output photons is an experimentally accessible measure to probe quantum phase transitions, as it does not require preparing the equilibrium state. Quantum Rabi model as an outstanding model can support superradiant phase transitions, and gets increasing interest in the quantum physics. This work presents an effective method to demonstrate the dynamical critical phenomenon in quantum Rabi model without preparing the Confirmed equilibrium state, i.e., a sudden change of the photon number distribution.
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| GB/T 7714 | Chen, Ye-Hong , Qiu, Yuan , Miranowicz, Adam et al. Sudden change of the photon output field marks phase transitions in the quantum Rabi model [J]. | COMMUNICATIONS PHYSICS , 2024 , 7 (1) . |
| MLA | Chen, Ye-Hong et al. "Sudden change of the photon output field marks phase transitions in the quantum Rabi model" . | COMMUNICATIONS PHYSICS 7 . 1 (2024) . |
| APA | Chen, Ye-Hong , Qiu, Yuan , Miranowicz, Adam , Lambert, Neill , Qin, Wei , Stassi, Roberto et al. Sudden change of the photon output field marks phase transitions in the quantum Rabi model . | COMMUNICATIONS PHYSICS , 2024 , 7 (1) . |
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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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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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Quantum phase transition and entanglement in the Rabi model with a squeezed light are investigated. We find a special unitary-transformation method that removes the nonintegrable squeezing and counterrotating-wave interactions when the qubit frequency is close to the field frequency. The analytical ground state agrees well with the numerical solution. We demonstrate that the ground state exhibits a first-order quantum phase transition at a critical point induced linearly by the squeezed light. This quantum phase transition requires neither multiple qubits nor an infinite ratio of qubit frequency to field frequency, which solves a critical problem for the theory and experiment in Rabi model. As the qubit-field coupling strength increases, the ground-state entanglement reaches its maximum value at the critical point.
Keyword ：
entanglement entanglement ground state ground state quantum phase transition quantum phase transition Rabi model Rabi model
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| GB/T 7714 | Yang, Jingwen , Shi, Zhicheng , Yang, Zhen-Biao et al. First-order quantum phase transition in the squeezed Rabi model [J]. | PHYSICA SCRIPTA , 2023 , 98 (4) . |
| MLA | Yang, Jingwen et al. "First-order quantum phase transition in the squeezed Rabi model" . | PHYSICA SCRIPTA 98 . 4 (2023) . |
| APA | Yang, Jingwen , Shi, Zhicheng , Yang, Zhen-Biao , Shen, Li-tuo , Zheng, Shi-Biao . First-order quantum phase transition in the squeezed Rabi model . | PHYSICA SCRIPTA , 2023 , 98 (4) . |
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Quantum error correction (QEC) aims to protect logical qubits from noises by using the redundancy of a large Hilbert space, which allows errors to be detected and corrected in real time(1). In most QEC codes(2-8), a logical qubit is encoded in some discrete variables, for example photon numbers, so that the encoded quantum information can be unambiguously extracted after processing. Over the past decade, repetitive QEC has been demonstrated with various discrete-variable-encoded scenarios(9-17). However, extending the lifetimes of thus-encoded logical qubits beyond the best available physical qubit still remains elusive, which represents a break-even point for judging the practical usefulness of QEC. Here we demonstrate a QEC procedure in a circuit quantum electrodynamics architecture(18), where the logical qubit is binomially encoded in photon-number states of a microwave cavity(8), dispersively coupled to an auxiliary superconducting qubit. By applying a pulse featuring a tailored frequency comb to the auxiliary qubit, we can repetitively extract the error syndrome with high fidelity and perform error correction with feedback control accordingly, thereby exceeding the break-even point by about 16% lifetime enhancement. Our work illustrates the potential of hardware-efficient discrete-variable encodings for fault-tolerant quantum computation(19).
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| GB/T 7714 | Ni, Zhongchu , Li, Sai , Deng, Xiaowei et al. Beating the break-even point with a discrete-variable-encoded logical qubit [J]. | NATURE , 2023 , 616 (7955) : 56-, . |
| MLA | Ni, Zhongchu et al. "Beating the break-even point with a discrete-variable-encoded logical qubit" . | NATURE 616 . 7955 (2023) : 56-, . |
| APA | Ni, Zhongchu , Li, Sai , Deng, Xiaowei , Cai, Yanyan , Zhang, Libo , Wang, Weiting et al. Beating the break-even point with a discrete-variable-encoded logical qubit . | NATURE , 2023 , 616 (7955) , 56-, . |
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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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