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学者姓名：赵新宇
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Abstract ：
In this paper, the higher energy levels of the transmon qubit are taken into consideration to investigate the continuous variable entanglement generation between the transmon qubit and the single-mode cavity. Based on the framework of cavity Quantum Electrodynamics (QED), the authors show the entanglement generation depends on the driving field intensity, coupling strength, cavity field frequency, and qubit frequency. The numerical results show that strong entanglement can be generated by properly tuning these parameters. It is hoped that the results presented in this paper may lead to a better understanding of quantum entanglement generation in cavity QED systems and provide new perspectives for further research in quantum information processing. This study investigates continuous variable entanglement between a transmon qubit and a cavity in Quantum Electrodynamics (QED). It examines the effects of driving field intensity, coupling strength, and frequency on entanglement, providing insights for quantum information processing by demonstrating control over strong entanglement in cavity QED systems.image
Keyword ：
cavity cavity entanglement entanglement logarithmic negativity logarithmic negativity transmon transmon
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| GB/T 7714 | Wu, Jian-Zhuang , Lu, Lian-E , Zhao, Xin-Yu et al. Entanglement Generation in Capacitively Coupled Transmon-Cavity System [J]. | ANNALEN DER PHYSIK , 2024 , 536 (5) . |
| MLA | Wu, Jian-Zhuang et al. "Entanglement Generation in Capacitively Coupled Transmon-Cavity System" . | ANNALEN DER PHYSIK 536 . 5 (2024) . |
| APA | Wu, Jian-Zhuang , Lu, Lian-E , Zhao, Xin-Yu , Ma, Yong-Hong . Entanglement Generation in Capacitively Coupled Transmon-Cavity System . | ANNALEN DER PHYSIK , 2024 , 536 (5) . |
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Chaos is important in nonlinear science and promotes the development of fundamental studies, such as neural networks, extreme event statistics, and electron transport. In this paper, a theoretical scheme for generating dynamical chaos in a Fabry-Perot cavity with two-level atoms is investigated. Through the injection of atoms, controllable chaos of the cavity and mechanical oscillator is achieved simultaneously by the external laser field. The trajectory and the maximal Lyapunov exponent that characterize the properties of the chaos could be optimized by adjusting the coupling constant, driving field, injection of atoms, the frequency of the cavity, and the frequency of the mechanical oscillator. This study provides a new idea to manipulate the cavity and mechanical chaos assisted by two level atoms. It is hoped that the results presented can benefit controllable chaos generation and its applications.
Keyword ：
chaos chaos Fabry-Perot cavities Fabry-Perot cavities optomechanical systems optomechanical systems two-level atoms two-level atoms
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| GB/T 7714 | Ma, Yong-Hong , Zhao, Rong , Hou, Xing-Wang et al. Chaos Generation in Opto-Mechanical Coupling System Assisted by Two-Level Atoms [J]. | ANNALEN DER PHYSIK , 2023 , 535 (4) . |
| MLA | Ma, Yong-Hong et al. "Chaos Generation in Opto-Mechanical Coupling System Assisted by Two-Level Atoms" . | ANNALEN DER PHYSIK 535 . 4 (2023) . |
| APA | Ma, Yong-Hong , Zhao, Rong , Hou, Xing-Wang , Liu, Jia-Wei , Li, Ming-Xin , Zhao, Xinyu . Chaos Generation in Opto-Mechanical Coupling System Assisted by Two-Level Atoms . | ANNALEN DER PHYSIK , 2023 , 535 (4) . |
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The dynamics of chaos in quantum systems has attracted much interest in connection with the fundamental aspects of quantum mechanics. We study the chaotic dynamics of both the excitonic mode and the cavity mode in a microcavity containing a quantum well driven by an external field. We investigate how the chaotic dynamics is influenced by the frequencies of the exciton and the cavity, the coupling constant between the exciton and cavity, the Coulomb interaction between excitons, and the response of the exciton to the cavity and the external field. We show that chaos can be generated synchronously in both the cavity and the excitonic mode by choosing appropriate parameters. Moreover, this kind of chaos can be controlled by the coupling constant, the strength of the interaction between excitons, the external field, the response of the excitons to the cavity, and the detuning between the cavity field and the excitonic field. The present study may have applications in chaos-based neural networks and extreme event statistics.
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| GB/T 7714 | Ma, Yong Hong , Hou, Xing Wang , Zhao, Rong et al. Chaos generated in a semiconductor microcavity [J]. | PHYSICAL REVIEW E , 2023 , 107 (2) . |
| MLA | Ma, Yong Hong et al. "Chaos generated in a semiconductor microcavity" . | PHYSICAL REVIEW E 107 . 2 (2023) . |
| APA | Ma, Yong Hong , Hou, Xing Wang , Zhao, Rong , Li, Ming Xin , Zhao, Xin Yu . Chaos generated in a semiconductor microcavity . | PHYSICAL REVIEW E , 2023 , 107 (2) . |
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In this paper, we propose a one-step scheme for generating a multiqubit controlled-controlled-Z (CCZ) gate based on Rydberg atoms where an amplitude-modulated field is employed to induce Rydberg antiblockade. The Rydberg atoms can form a Rabi oscillation between the ground state and the collective excited state effectively, so a one-step three-qubit CCZ gate can be easily achieved through a Rabi cycle. Numerical simulation results show that the scheme has a high fidelity and robustness against errors which are caused by parameter errors, intrinsic errors, and atomic decays. Therefore, we hope that this scheme will enable fast and robust quantum computing in the near future.
Keyword ：
multiqubit controlled-controlled-Z gates multiqubit controlled-controlled-Z gates Rydberg atoms Rydberg atoms
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| GB/T 7714 | Li, Yan , Lin, Zhe-Ping , Zhao, Xin-Yu et al. One-step implementation of multiqubit controlled-controlled-Z gates with Rydberg atoms [J]. | LASER PHYSICS LETTERS , 2023 , 20 (9) . |
| MLA | Li, Yan et al. "One-step implementation of multiqubit controlled-controlled-Z gates with Rydberg atoms" . | LASER PHYSICS LETTERS 20 . 9 (2023) . |
| APA | Li, Yan , Lin, Zhe-Ping , Zhao, Xin-Yu , Chen, Ye-Hong , Xia, Yan . One-step implementation of multiqubit controlled-controlled-Z gates with Rydberg atoms . | LASER PHYSICS LETTERS , 2023 , 20 (9) . |
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Noise is often considered as the biggest enemy of maintaining quantum entanglement. However, in this paper, it shows quantum entanglement can be protected by introducing extra noises to a quantum system. As an example, the dynamics of a two-qubit system coupled to a cavity is studied under the influence of three noises, a quantized noise from the leakage of the cavity and two classical noises in the couplings between the two-qubit system and the cavity. The master equation beyond the Markov approximation is derived and the mechanism of the entanglement protection is analyzed in a special case with analytical solutions. In short, the entanglement loss caused by the dissipation to the bath might be weaken by introducing high-frequency classical noises properly. The numerical simulations not only confirm the feasibility of protecting entanglement by noises but also reveal that the properties of the classical noises have a significant impact on the performance of the entanglement protection. Due to inevitable interaction with noisy environments, quantum systems often lose their entanglement quickly. Since noise is ubiquitous, an intriguing question arises: Is it possible to combat a noisy environment with its own weapon, namely, noise? This article explores the suppression of entanglement loss caused by a noisy environment through properly introducing additional classical noises.image
Keyword ：
entanglement protection entanglement protection noise noise non-Markovian environment non-Markovian environment
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| GB/T 7714 | Zheng, Wenjie , Huang, Bi-Hua , Zhao, Xinyu et al. Quantum Entanglement Protection by Utilizing Classical Noises [J]. | ADVANCED QUANTUM TECHNOLOGIES , 2023 , 6 (12) . |
| MLA | Zheng, Wenjie et al. "Quantum Entanglement Protection by Utilizing Classical Noises" . | ADVANCED QUANTUM TECHNOLOGIES 6 . 12 (2023) . |
| APA | Zheng, Wenjie , Huang, Bi-Hua , Zhao, Xinyu , Xia, Yan . Quantum Entanglement Protection by Utilizing Classical Noises . | ADVANCED QUANTUM TECHNOLOGIES , 2023 , 6 (12) . |
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In this paper, we propose a one-step scheme for generating a multiqubit controlled–controlled-Z (CCZ) gate based on Rydberg atoms where an amplitude-modulated field is employed to induce Rydberg antiblockade. The Rydberg atoms can form a Rabi oscillation between the ground state and the collective excited state effectively, so a one-step three-qubit CCZ gate can be easily achieved through a Rabi cycle. Numerical simulation results show that the scheme has a high fidelity and robustness against errors which are caused by parameter errors, intrinsic errors, and atomic decays. Therefore, we hope that this scheme will enable fast and robust quantum computing in the near future.
Keyword ：
multiqubit controlled—controlled-gates multiqubit controlled—controlled-gates Rydberg atoms Rydberg atoms
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| GB/T 7714 | Yan Li , Zhe-Ping Lin , Xin-Yu Zhao et al. One-step implementation of multiqubit controlled–controlled- gates with Rydberg atoms [J]. | Laser Physics Letters , 2023 , 20 (9) . |
| MLA | Yan Li et al. "One-step implementation of multiqubit controlled–controlled- gates with Rydberg atoms" . | Laser Physics Letters 20 . 9 (2023) . |
| APA | Yan Li , Zhe-Ping Lin , Xin-Yu Zhao , Ye-Hong Chen , Yan Xia . One-step implementation of multiqubit controlled–controlled- gates with Rydberg atoms . | Laser Physics Letters , 2023 , 20 (9) . |
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In this paper, we investigate coherence protection of a quantum system coupled to a hierarchical environment by utilizing noise. As an example, we solve the Jaynes-Cummings model in the presence of both a classical and a quantized noise. The master equation is derived beyond the Markov approximation, where the influence of memory effects from both noises is taken into account. More importantly, we find that the performance of the coherence protection sensitively depends on the non-Markovian properties of both noises. By analyzing the mathematical mechanism of the coherence protection, we show the decoherence caused by a non-Markovian noise with longer memory time can be suppressed by another Markovian noise with shorter memory time. Last but not least, as an outlook, we try to analyze the connection between the atom-cavity entanglement and the atomic coherence, then discuss the possible clue to search the required noise. The results presented in this paper show the possibility of protecting coherence by utilizing noise and may open an alternative path to design noise-assisted coherence protection schemes.
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| GB/T 7714 | Zhao, Xinyu , Ma, Yong-hong , Xia, Yan . Noise-assisted quantum coherence protection in a hierarchical environment [J]. | PHYSICAL REVIEW A , 2022 , 105 (4) . |
| MLA | Zhao, Xinyu et al. "Noise-assisted quantum coherence protection in a hierarchical environment" . | PHYSICAL REVIEW A 105 . 4 (2022) . |
| APA | Zhao, Xinyu , Ma, Yong-hong , Xia, Yan . Noise-assisted quantum coherence protection in a hierarchical environment . | PHYSICAL REVIEW A , 2022 , 105 (4) . |
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In Si quantum dots, the valley degree of freedom, in particular the generally small valley splitting and the dot-dependent valley-orbit phase, adds complexities to the low-energy electron dynamics. In particular, tunnel coupling, a key knob in charge and spin qubit manipulations, is strongly dependent on the valleyorbit coupling in a Si double dot. Here we propose a four-level model that incorporates excited valley states to extract ground-state tunnel coupling information for a Si double quantum dot. This scheme is based on a charge-sensing measurement on a double dot in equilibrium, as proposed in the widely used protocol for a GaAs double dot [DiCarlo et al., Phys. Rev. Lett. 92, 226801 (2004)]. Our theory helps determine both intra- and intervalley tunnel coupling with high accuracy, and is robust against uncertainties in system parameters such as valley splittings in the individual quantum dots.
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| GB/T 7714 | Zhao, Xinyu , Hu, Xuedong . Measurement of Tunnel Coupling in a Si Double Quantum dot Based on Charge Sensing [J]. | PHYSICAL REVIEW APPLIED , 2022 , 17 (6) . |
| MLA | Zhao, Xinyu et al. "Measurement of Tunnel Coupling in a Si Double Quantum dot Based on Charge Sensing" . | PHYSICAL REVIEW APPLIED 17 . 6 (2022) . |
| APA | Zhao, Xinyu , Hu, Xuedong . Measurement of Tunnel Coupling in a Si Double Quantum dot Based on Charge Sensing . | PHYSICAL REVIEW APPLIED , 2022 , 17 (6) . |
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In this paper, a protocol for nondestructive parity meter (NPM) of two cat-state qubits is proposed. The physical model contains two cavities and an auxiliary qubit. For each cavity, the quantum information is encoded on the odd and even cat state, forming a cat-state qubit. By adjusting the strength of the driving field on the auxiliary qubit, an effective Hamiltonian for cavity-selective transition is derived. Moreover, reverse engineering based on the effective Hamiltonian is applied to find the evolution path, and the systematic-error-sensitivity nullification method is used to select proper parameters of the evolution path. In this way, robust control fields are designed to combat the influence of the systematic errors. Furthermore, the effects of random noise and decoherence on the fidelity of the protocol are considered. Numerical simulations show that the protocol is insensitive to the experimental imperfection, including systematic errors, random noise and decoherence. Therefore, the protocol is expected to expand the vision of realizing NPM.
Keyword ：
cat-state qubits cat-state qubits nondestructive parity meters nondestructive parity meters optimal control optimal control reverse engineering reverse engineering
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| GB/T 7714 | Li, Dong-Sheng , Kang, Yi-Hao , Zhao, Xin-Yu et al. Fast and Robust Nondestructive Parity Meter for Cat-State Qubits via Reverse Engineering and Optimal Control [J]. | ANNALEN DER PHYSIK , 2022 , 535 (2) . |
| MLA | Li, Dong-Sheng et al. "Fast and Robust Nondestructive Parity Meter for Cat-State Qubits via Reverse Engineering and Optimal Control" . | ANNALEN DER PHYSIK 535 . 2 (2022) . |
| APA | Li, Dong-Sheng , Kang, Yi-Hao , Zhao, Xin-Yu , Song, Jie , Xia, Yan . Fast and Robust Nondestructive Parity Meter for Cat-State Qubits via Reverse Engineering and Optimal Control . | ANNALEN DER PHYSIK , 2022 , 535 (2) . |
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In this paper, we propose a rapid and high-fidelity protocol to generate Bell states by dissipation dynamics and Lyapunov control. With a designed dissipative path, an arbitrary initial state can evolve into the target Bell state with high fidelity. Besides, the evolution is accelerated by Lyapunov control pulses, particularly at the early stage of the evolution. The time consumption of achieving a certain threshold of required fidelity is shortened remarkably. By analyzing the impact of the pulses on the protocol, we show how to select the suitable pulses and their strengths to achieve a better fidelity. At last, we numerically prove that the protocol is robust against possible noises. The results presented in the paper may open a new path to achieve fast and high-fidelity generation of entangled states based on dissipation dynamics.
Keyword ：
Bell state Bell state Dissipation dynamics Dissipation dynamics Lyapunov control Lyapunov control
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| GB/T 7714 | Wang, Ying-Qi , Wang, Yu , Zhao, Xinyu et al. Accelerated high-fidelity Bell states generation based on dissipation dynamics and Lyapunov control [J]. | QUANTUM INFORMATION PROCESSING , 2021 , 20 (12) . |
| MLA | Wang, Ying-Qi et al. "Accelerated high-fidelity Bell states generation based on dissipation dynamics and Lyapunov control" . | QUANTUM INFORMATION PROCESSING 20 . 12 (2021) . |
| APA | Wang, Ying-Qi , Wang, Yu , Zhao, Xinyu , Song, Jie , Xia, Yan . Accelerated high-fidelity Bell states generation based on dissipation dynamics and Lyapunov control . | QUANTUM INFORMATION PROCESSING , 2021 , 20 (12) . |
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