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学者姓名：沈利托
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Abstract ：
In this work, we propose a comprehensive design for narrowband and passband composite pulse sequences by involving the dynamics of all states in the three -state system. The design is quite universal as all pulse parameters can be freely employed to modify the coefficients of error terms. Two modulation techniques, the strength and phase modulations, are used to achieve arbitrary population transfer with a desired excitation profile, while the system keeps minimal leakage to the third state. Furthermore, the current sequences are capable of tolerating inaccurate waveforms, detuning errors, and work well when rotating wave approximation is not strictly justified. Therefore, this work provides versatile adaptability for shaping various excitation profiles in both narrowband and passband sequences. (c) 2024 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement
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| GB/T 7714 | Zhang, Cheng , Shen, Li-tuo , Song, Jie et al. Three-state coherent control using narrowband and passband sequences [J]. | OPTICS EXPRESS , 2024 , 32 (2) : 1188-1206 . |
| MLA | Zhang, Cheng et al. "Three-state coherent control using narrowband and passband sequences" . | OPTICS EXPRESS 32 . 2 (2024) : 1188-1206 . |
| APA | Zhang, Cheng , Shen, Li-tuo , Song, Jie , Xia, Yan , Shi, Zhi-cheng . Three-state coherent control using narrowband and passband sequences . | OPTICS EXPRESS , 2024 , 32 (2) , 1188-1206 . |
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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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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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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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We propose a concatenated approach for implementing transitionless quantum driving regardless of adiabatic conditions while being robustness with respect to all kinds of systematic errors induced by pulse duration, pulse amplitude, detunings, and Stark shift, etc. The current approach is particularly efficient for all time-dependent pulses with arbitrary shape, and only the phase differences between pulses is required to properly modulate. The simple physical implementation without the help of pulse shaping techniques or extra pulses makes this approach quite universal and provides a different avenue for robust quantum control by the time-dependent Hamiltonian.
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| GB/T 7714 | Shi, Zhi-Cheng , Zhang, Cheng , Shen, Li-Tuo et al. Robust transitionless quantum driving: Concatenated approach [J]. | PHYSICAL REVIEW RESEARCH , 2023 , 5 (3) . |
| MLA | Shi, Zhi-Cheng et al. "Robust transitionless quantum driving: Concatenated approach" . | PHYSICAL REVIEW RESEARCH 5 . 3 (2023) . |
| APA | Shi, Zhi-Cheng , Zhang, Cheng , Shen, Li-Tuo , Song, Jie , Xia, Yan , Yi, X. X. . Robust transitionless quantum driving: Concatenated approach . | PHYSICAL REVIEW RESEARCH , 2023 , 5 (3) . |
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We study the quantum phase transition and entanglement in the Jaynes-Cummings model with squeezed light, utilize a special transformation method to obtain the analytical ground state of the model within the near-resonance regime, and numerically verify the validity of the analytical ground state. It is found that the ground state exhibits a first-order quantum phase transition at the critical point linearly induced by squeezed light, and the ground state entanglement reaches its maximum when the qubit-field coupling strength is large enough at the critical point.
Keyword ：
entanglement entanglement Jaynes-Cummings model Jaynes-Cummings model quantum phase transition quantum phase transition
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| GB/T 7714 | Tang, Chun-Qi , Shen, Li-Tuo . First-order quantum phase transition and entanglement in the Jaynes-Cummings model with a squeezed light [J]. | CHINESE PHYSICS B , 2023 , 32 (7) . |
| MLA | Tang, Chun-Qi et al. "First-order quantum phase transition and entanglement in the Jaynes-Cummings model with a squeezed light" . | CHINESE PHYSICS B 32 . 7 (2023) . |
| APA | Tang, Chun-Qi , Shen, Li-Tuo . First-order quantum phase transition and entanglement in the Jaynes-Cummings model with a squeezed light . | CHINESE PHYSICS B , 2023 , 32 (7) . |
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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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Abstract ：
We study the quantum phase transition and entanglement in the Jaynes-Cummings model with squeezed light,utilize a special transformation method to obtain the analytical ground state of the model within the near-resonance regime,and numerically verify the validity of the analytical ground state.It is found that the ground state exhibits a first-order quantum phase transition at the critical point linearly induced by squeezed light,and the ground state entanglement reaches its maximum when the qubit-field coupling strength is large enough at the critical point.
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| GB/T 7714 | Chun-Qi Tang , Li-Tuo Shen . First-order quantum phase transition and entanglement in the Jaynes-Cummings model with a squeezed light [J]. | 中国物理B（英文版） , 2023 , 32 (7) : 292-298 . |
| MLA | Chun-Qi Tang et al. "First-order quantum phase transition and entanglement in the Jaynes-Cummings model with a squeezed light" . | 中国物理B（英文版） 32 . 7 (2023) : 292-298 . |
| APA | Chun-Qi Tang , Li-Tuo Shen . First-order quantum phase transition and entanglement in the Jaynes-Cummings model with a squeezed light . | 中国物理B（英文版） , 2023 , 32 (7) , 292-298 . |
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We study the quantum metric in a driven Tavis-Cummings model, comprised of multiple qubits interacting with a quantized photonic field. The parametrical driving of the photonic field breaks the system's U(1) symmetry down to a Z2 symmetry, whose spontaneous breaking initiates a superradiant phase transition. We analytically solved the eigenenergies and eigenstates, and numerically simulated the system behaviors near the critical point. The critical behaviors near the superradiant phase transition are characterized by the quantum metric, defined in terms of the response of the quantum state to variation of the control parameter. In addition, a quantum metrological protocol based on the critical behaviors of the quantum metric near the superradiant phase transition is proposed, which enables greatly the achievable measurement precision.
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| GB/T 7714 | Lu, Jia-hao , Han, Pei-rong , Ning, Wen et al. Quantum metric and metrology with parametrically-driven Tavis-Cummings models [J]. | OPTICS EXPRESS , 2023 , 31 (25) : 41669-41683 . |
| MLA | Lu, Jia-hao et al. "Quantum metric and metrology with parametrically-driven Tavis-Cummings models" . | OPTICS EXPRESS 31 . 25 (2023) : 41669-41683 . |
| APA | Lu, Jia-hao , Han, Pei-rong , Ning, Wen , Zhu, Xin , Wu, Fan , Shen, Li-tuo et al. Quantum metric and metrology with parametrically-driven Tavis-Cummings models . | OPTICS EXPRESS , 2023 , 31 (25) , 41669-41683 . |
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