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学者姓名：施志成
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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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The unconventional photon blockade, which relies on the physical mechanism of quantum interference, is primarily investigated using a general master equation, where a weak nonlinearity must be presented in the system to achieve photon antibunching. In this study, we explore the unconventional photon blockade using an alternative master equation known as the two-photon absorption master equation, which is derived from the system and environment interaction via two-photon absorption. Specifically, we find that the unconventional photon blockade can be triggered in two-coupled cavities, where each cavity interacts with a two-photon absorption environment. Different from unconventional photon blockade via the general master equation, we show that the two-photon absorption acts as the weak nonlinearity, and this photon blockade corresponds to a large average photon number. To derive optimal conditions for achieving this blockade, we propose a non-Hermitian Hamiltonian method to describe the mode loss caused by the two-photon absorption. In addition, we highlight the distinctions between our proposal and other approaches for generating single-photon states based on two-photon absorption. © 2024 IOP Publishing Ltd.
Keyword ：
photon blockade photon blockade photons antibunching photons antibunching photon statistics photon statistics
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| GB/T 7714 | Zhou, Y.-H. , Liu, T. , Zhang, X.-Y. et al. Unconventional photon blockade via two-photon absorption [J]. | Physica Scripta , 2024 , 99 (9) . |
| MLA | Zhou, Y.-H. et al. "Unconventional photon blockade via two-photon absorption" . | Physica Scripta 99 . 9 (2024) . |
| APA | Zhou, Y.-H. , Liu, T. , Zhang, X.-Y. , Wu, Q.-C. , Shi, Z.-C. , Yang, C.-P. . Unconventional photon blockade via two-photon absorption . | Physica Scripta , 2024 , 99 (9) . |
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Cat-state qubits formed by photonic cat states have a biased noise channel, i.e., one type of error dominates over all the others. We demonstrate that such biased-noise qubits are also promising for error-tolerant simulations of the quantum Rabi model (and its varieties) by coupling a cat-state qubit to an optical cavity. Using the cat-state qubit can effectively enhance the counterrotating coupling, allowing us to explore several fascinating quantum phenomena relying on the counterrotating interaction. Moreover, another benefit from biased-noise cat qubits is that the two main error channels (frequency and amplitude mismatches) are both exponentially suppressed. Therefore, the simulation protocols are robust against parameter errors of the parametric drive that determines the projection subspace. We analyze three examples: (i) collapse and revivals of quantum states; (ii) hidden symmetry and tunneling dynamics; and (iii) pair-cat-code computation. © 2024 American Physical Society.
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| GB/T 7714 | Chen, Y.-H. , Shi, Z.-C. , Nori, F. et al. Error-Tolerant Amplification and Simulation of the Ultrastrong-Coupling Quantum Rabi Model [J]. | Physical Review Letters , 2024 , 133 (3) . |
| MLA | Chen, Y.-H. et al. "Error-Tolerant Amplification and Simulation of the Ultrastrong-Coupling Quantum Rabi Model" . | Physical Review Letters 133 . 3 (2024) . |
| APA | Chen, Y.-H. , Shi, Z.-C. , Nori, F. , Xia, Y. . Error-Tolerant Amplification and Simulation of the Ultrastrong-Coupling Quantum Rabi Model . | Physical Review Letters , 2024 , 133 (3) . |
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A scheme is proposed for achieving robust population inversion in five-level systems by means of composite pulses. An example of such a system consists of the magnetic sublevels with angular momenta Jg=2$J_g=2$ and Je=2$J_e=2$. Through elaborately constructing the relative phases of pulse pairs, the composite sequences perform well in suppressing the uncorrelated pulse area errors. In particular, the five pulse-pair sequence possesses good robustness and a short evolution time. The composite sequences are further designed to compensate for a single type of pulse area errors to any desired order. This work provides a high-efficiency way for robust quantum state manipulation in five-level systems. This work is devoted to achieving robust population inversion in a five-level quantum system by means of composite pulses. The designed composite sequence can compensate the pulse area errors of the driving fields to any order. The results demonstrate that the proposed method is promising in error-prone environments, a superior technique for high-fidelity quantum computation in multilevel systems. image
Keyword ：
composite pulses composite pulses five-level systems five-level systems quantum state transfer quantum state transfer robust quantum control robust quantum control
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| GB/T 7714 | Wang, Jian-Hui , Shi, Zhi-Cheng , Chen, Ye-Hong et al. Robust Quantum State Manipulation by Composite Pulses in Five-Level Systems [J]. | ADVANCED QUANTUM TECHNOLOGIES , 2024 , 7 (9) . |
| MLA | Wang, Jian-Hui et al. "Robust Quantum State Manipulation by Composite Pulses in Five-Level Systems" . | ADVANCED QUANTUM TECHNOLOGIES 7 . 9 (2024) . |
| APA | Wang, Jian-Hui , Shi, Zhi-Cheng , Chen, Ye-Hong , Song, Jie , Huang, Bi-Hua , Xia, Yan . Robust Quantum State Manipulation by Composite Pulses in Five-Level Systems . | ADVANCED QUANTUM TECHNOLOGIES , 2024 , 7 (9) . |
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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.
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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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Abstract ：
Cat-state qubits formed by photonic cat states have a biased noise channel, i.e., one type of error dominates over all the others. We demonstrate that such biased-noise qubits are also promising for error-tolerant simulations of the quantum Rabi model (and its varieties) by coupling a cat-state qubit to an optical cavity. Using the cat-state qubit can effectively enhance the counterrotating coupling, allowing us to explore several fascinating quantum phenomena relying on the counterrotating interaction. Moreover, another benefit from biased-noise cat qubits is that the two main error channels (frequency and amplitude mismatches) are both exponentially suppressed. Therefore, the simulation protocols are robust against parameter errors of the parametric drive that determines the projection subspace. We analyze three examples: (i) collapse and revivals of quantum states; (ii) hidden symmetry and tunneling dynamics; and (iii) pair-cat-code computation.
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| GB/T 7714 | Chen, Ye-Hong , Shi, Zhi-Cheng , Nori, Franco et al. Error-Tolerant Amplification and Simulation of the Ultrastrong-Coupling Quantum Rabi Model [J]. | PHYSICAL REVIEW LETTERS , 2024 , 133 (3) . |
| MLA | Chen, Ye-Hong et al. "Error-Tolerant Amplification and Simulation of the Ultrastrong-Coupling Quantum Rabi Model" . | PHYSICAL REVIEW LETTERS 133 . 3 (2024) . |
| APA | Chen, Ye-Hong , Shi, Zhi-Cheng , Nori, Franco , Xia, Yan . Error-Tolerant Amplification and Simulation of the Ultrastrong-Coupling Quantum Rabi Model . | PHYSICAL REVIEW LETTERS , 2024 , 133 (3) . |
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Recently, a groundbreaking advancement known as multimode photon blockade (MPB) is proposed by S. Chakram et al. [Nature. Phys. 18, 879-884 (2022)], showcasing its ability to generate multimode W states. Inspired by their work, in this paper, an interesting method is proposed to investigate MPB by engineering the eigenstates of the system Hamiltonian, which is defined as the reverse design method. It is demonstrated that an entangled state is created with a certain probability by sharing a single photon between two coupled Kerr-nonlinear cavities. This entangled state in the two-coupled cavities blocks the creation of the subsequent photons. The system is in a superposition of only the entangled state and the vacuum state. And the photon blockade (PB) exists in two cavities simultaneously. The reversed design method can also be utilized to study MPB in three coupled cavities with Kerr nonlinearities by creating a three-qubit W state. This proposal introduces an interesting method to investigate multimode photon blockade by engineering the eigenstates of the system Hamiltonian, which is defined as the reverse design method. An entangled state is created with a certain probability by sharing a single photon between two coupled Kerr-nonlinear cavities. This entangled state in the two-coupled cavities blocks the creation of the subsequent photons. image
Keyword ：
nonclassical light nonclassical light photon blockade photon blockade photon statistics photon statistics
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| GB/T 7714 | Zhou, Yan-Hui , Liu, Tong , Zhang, Xing-Yuan et al. Multimode Photon Blockade with a Reversed Design Method [J]. | ADVANCED QUANTUM TECHNOLOGIES , 2024 , 7 (8) . |
| MLA | Zhou, Yan-Hui et al. "Multimode Photon Blockade with a Reversed Design Method" . | ADVANCED QUANTUM TECHNOLOGIES 7 . 8 (2024) . |
| APA | Zhou, Yan-Hui , Liu, Tong , Zhang, Xing-Yuan , Wu, Qi-Cheng , Chen, Dong-Xu , Shi, Zhi-Cheng et al. Multimode Photon Blockade with a Reversed Design Method . | ADVANCED QUANTUM TECHNOLOGIES , 2024 , 7 (8) . |
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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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Abstract ：
The unconventional photon blockade, which relies on the physical mechanism of quantum interference, is primarily investigated using a general master equation, where a weak nonlinearity must be presented in the system to achieve photon antibunching. In this study, we explore the unconventional photon blockade using an alternative master equation known as the two-photon absorption master equation, which is derived from the system and environment interaction via two-photon absorption. Specifically, we find that the unconventional photon blockade can be triggered in two-coupled cavities, where each cavity interacts with a two-photon absorption environment. Different from unconventional photon blockade via the general master equation, we show that the two-photon absorption acts as the weak nonlinearity, and this photon blockade corresponds to a large average photon number. To derive optimal conditions for achieving this blockade, we propose a non-Hermitian Hamiltonian method to describe the mode loss caused by the two-photon absorption. In addition, we highlight the distinctions between our proposal and other approaches for generating single-photon states based on two-photon absorption.
Keyword ：
photon blockade photon blockade photons antibunching photons antibunching photon statistics photon statistics
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| GB/T 7714 | Zhou, Yan-Hui , Liu, Tong , Zhang, Xing-Yuan et al. Unconventional photon blockade via two-photon absorption [J]. | PHYSICA SCRIPTA , 2024 , 99 (9) . |
| MLA | Zhou, Yan-Hui et al. "Unconventional photon blockade via two-photon absorption" . | PHYSICA SCRIPTA 99 . 9 (2024) . |
| APA | Zhou, Yan-Hui , Liu, Tong , Zhang, Xing-Yuan , Wu, Qi-Cheng , Shi, Zhi-Cheng , Yang, Chui-Ping . Unconventional photon blockade via two-photon absorption . | PHYSICA SCRIPTA , 2024 , 99 (9) . |
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