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学者姓名：郑仕标
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Abstract ：
Dissipation usually plays a negative role in quantum metrological technologies, which aim to improve measurement precision by leveraging quantum effects that are vulnerable to environment-induced decoherence. Recently, it has been demonstrated that dissipation can actually be used as a favorable resource for enhancing the susceptibility of signal detection. However, demonstrations of such enhancement for detecting physical quantities in open quantum systems are still lacking. Here a protocol is proposed and demonstrated for realizing such non-Hermitian quantum sensors for probing the coupling between a qubit and a resonator subjecting to energy dissipations. The excitation-number conversion associated with the no-jump evolution trajectory enables removal of the noisy outcomes with quantum jumps, implementing the exceptional point (EP), where the Rabi splitting exhibits a divergent behavior in response to a tiny variation of the effective coupling. The sensitivity enhancement near the EP is confirmed by both theoretical calculation and experimental measurement.
Keyword ：
exceptional point exceptional point quantum sensing quantum sensing superconducting circuit superconducting circuit
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| GB/T 7714 | Han, Pei-Rong , Wu, Fan , Huang, Xin-Jie et al. Enhancement of Sensitivity Near Exceptional Points in Dissipative Qubit-Resonator Systems [J]. | ADVANCED QUANTUM TECHNOLOGIES , 2025 . |
| MLA | Han, Pei-Rong et al. "Enhancement of Sensitivity Near Exceptional Points in Dissipative Qubit-Resonator Systems" . | ADVANCED QUANTUM TECHNOLOGIES (2025) . |
| APA | Han, Pei-Rong , Wu, Fan , Huang, Xin-Jie , Wu, Huai-Zhi , Zou, Chang-Ling , Yi, Wei et al. Enhancement of Sensitivity Near Exceptional Points in Dissipative Qubit-Resonator Systems . | ADVANCED QUANTUM TECHNOLOGIES , 2025 . |
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Abstract ：
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 , 7 (11) . |
| MLA | Chen, K. et al. "Critical Sensing with a Single Bosonic Mode Without Boson–Boson Interactions" . | Advanced Quantum Technologies 7 . 11 (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 , 7 (11) . |
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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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Abstract ：
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. A protocol is proposed for the critical sensing with a single parametrically-driven bosonic mode. Below the critical point, the system has a ladder-type eigenspectrum, underlain by squeezed Fock eigenstates. The results reveal that both the quantum Fisher information and the inverted variance exhibit a diverging behavior approaching the critical point, which confirms the criticality-enhanced quantum sensing. image
Keyword ：
criticality-enhancement criticality-enhancement critical sensing critical sensing quantum fisher information quantum fisher information
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| GB/T 7714 | Chen, Ken , Lue, Jia-Hao , Zhu, Xin et al. Critical Sensing with a Single Bosonic Mode Without Boson-Boson Interactions [J]. | ADVANCED QUANTUM TECHNOLOGIES , 2024 , 7 (11) . |
| MLA | Chen, Ken et al. "Critical Sensing with a Single Bosonic Mode Without Boson-Boson Interactions" . | ADVANCED QUANTUM TECHNOLOGIES 7 . 11 (2024) . |
| APA | Chen, Ken , Lue, Jia-Hao , Zhu, Xin , Zhang, Hao-Long , Ning, Wen , Yang, Zhen-Biao et al. Critical Sensing with a Single Bosonic Mode Without Boson-Boson Interactions . | ADVANCED QUANTUM TECHNOLOGIES , 2024 , 7 (11) . |
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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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Abstract ：
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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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.
Cite：
Copy from the list or Export to your reference management。
| 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 ：
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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