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学者姓名：黄碧华
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Abstract ：
In this paper, we put forward a scheme for flexibly preparing W states in the presence of detunings and asymmetric couplings in a nanoring-quantum-dot (nanoring-QD) system. Based on the gradient ascent pulse engineering algorithm, the coupling strength modulation (CSM) and the energy level modulation (ELM) methods are proposed, respectively. In the CSM method, the waveforms of the coupling strengths are properly designed to compensate for detunings, thus the decline on the fidelity is effectively suppressed. For the asymmetric couplings, a high-fidelity W state can be generated by the ELM method, which alters the energy levels of QDs in a desired manner. Finally, we generalize the current scheme to realize the preparation of N-particle W states in nanoring-QD systems.
Keyword ：
GRAPE GRAPE quantum dots quantum dots W states W states
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| GB/T 7714 | Chen, Zhen , Shi, Zhi-Cheng , Song, Jie et al. Flexible preparation of the W state via the GRAPE algorithm in a nanoring-quantum-dot system [J]. | LASER PHYSICS LETTERS , 2024 , 21 (4) . |
| MLA | Chen, Zhen et al. "Flexible preparation of the W state via the GRAPE algorithm in a nanoring-quantum-dot system" . | LASER PHYSICS LETTERS 21 . 4 (2024) . |
| APA | Chen, Zhen , Shi, Zhi-Cheng , Song, Jie , Huang, Bi-Hua , Xia, Yan . Flexible preparation of the W state via the GRAPE algorithm in a nanoring-quantum-dot system . | LASER PHYSICS LETTERS , 2024 , 21 (4) . |
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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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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 protocol to distinguish chiral molecules using dissipation dynamics. The physical model is based on a four-level structure with a ground level, a lower level, and two excited levels. Under the condition of large detuning, a chirality-selective transition from the ground level to a dressed state of two excited levels can be achieved, where only the left-handed enantiomer can be exited to the dressed state. The left-handed enantiomer in the dressed state will couple with the cavity mode and evolve to the lower level with a photon creation. When the photon loss happens, the left-handed enantiomer cannot be excited to the dressed state again by absorbing the photon, thus remaining in the lower level. Then, the chiralities of the enantiomers can be distinguished by measuring their final states. We take 1,2-propanediol molecules as an example to demonstrate the protocol, where the difference of the populations of the lower level for the left- and right-handed enantiomer approaches unity in a relatively short operation time. Numerical simulation results show that the scheme is insensitive to the influence of the phase drift and frequency mismatch. Therefore, the protocol may provide an alternative approach for chirality discrimination.
Keyword ：
Chirality discrimination Chirality discrimination Dissipation dynamics Dissipation dynamics
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| GB/T 7714 | Ding, Wei-Wei , Lin, Zhe-Ping , Kang, Yi-Hao et al. Effective chirality discrimination via dissipation dynamics [J]. | QUANTUM INFORMATION PROCESSING , 2023 , 22 (9) . |
| MLA | Ding, Wei-Wei et al. "Effective chirality discrimination via dissipation dynamics" . | QUANTUM INFORMATION PROCESSING 22 . 9 (2023) . |
| APA | Ding, Wei-Wei , Lin, Zhe-Ping , Kang, Yi-Hao , Liu, Yang , Song, Jie , Huang, Bi-Hua et al. Effective chirality discrimination via dissipation dynamics . | QUANTUM INFORMATION PROCESSING , 2023 , 22 (9) . |
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Abstract ：
当冷空气流过一个通电的发热线圈时,线圈的温度会降低,其最终的温度取决于空气流速.对一个钨线圈通以恒定电流,将其置于风场中,用台式万用表测量线圈两端电压而得到其电阻,再利用电阻-温度特性测得线圈温度,以此达到测量风速的 目的.本文将详细探究这一物理过程,从实验进行验证,最终得到一种可靠的测量风速的方法.研究表明:该方法具有较高的测量精度和较短的响应时间,对流场干扰小.
Keyword ：
强制对流 强制对流 恒流法 恒流法 热传导 热传导 电流热效应 电流热效应 电阻温度特性 电阻温度特性
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| GB/T 7714 | 林品臻 , 江云坤 , 冯柏赫 et al. 一种利用通电线圈测量风速的方法 [J]. | 物理与工程 , 2023 , 33 (6) : 85-89 . |
| MLA | 林品臻 et al. "一种利用通电线圈测量风速的方法" . | 物理与工程 33 . 6 (2023) : 85-89 . |
| APA | 林品臻 , 江云坤 , 冯柏赫 , 黄碧华 . 一种利用通电线圈测量风速的方法 . | 物理与工程 , 2023 , 33 (6) , 85-89 . |
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We propose a quantum control scheme with the help of Lyapunov control function in the optomechanics system. The principle of the idea is to design suitable control fields to steer the Lyapunov control function to zero as t -> infinity while the quantum system is driven to the target state. Such an evolution makes no limit on the initial state and one needs not manipulate the laser pulses during the evolution. To prove the effectiveness of the scheme, we show two useful applications in the optomechanics system: one is the cooling of nanomechanical resonator and the other is the quantum fluctuation transfer between membranes. Numerical simulation demonstrates that the perfect and fast cooling of nanomechanical resonator and quantum fluctuation transfer between membranes can be rapidly achieved. Besides, some optimizations are made on the traditional Lyapunov control waveform and the optimized bang-bang control fields makes Lyapunov function V decrease faster. The optimized quantum control scheme can achieve the same goal with greater efficiency. Hence, we hope that this work may open a new avenue of the experimental realization of cooling mechanical oscillator, quantum fluctuations transfer between membranes and other quantum optomechanics tasks and become an alternative candidate for quantum manipulation of macroscopic mechanical devices in the near future.
Keyword ：
bang-bang solution bang-bang solution Lyapunov control Lyapunov control optomechanics system optomechanics system quantum control quantum control
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| GB/T 7714 | Wang, Yu , Kang, Yi-Hao , Hu, Chang-Sheng et al. Quantum control with Lyapunov function and bang-bang solution in the optomechanics system [J]. | FRONTIERS OF PHYSICS , 2022 , 17 (3) . |
| MLA | Wang, Yu et al. "Quantum control with Lyapunov function and bang-bang solution in the optomechanics system" . | FRONTIERS OF PHYSICS 17 . 3 (2022) . |
| APA | Wang, Yu , Kang, Yi-Hao , Hu, Chang-Sheng , Huang, Bi-Hua , Song, Jie , Xia, Yan . Quantum control with Lyapunov function and bang-bang solution in the optomechanics system . | FRONTIERS OF PHYSICS , 2022 , 17 (3) . |
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A protocol to distinguish chiral molecules with the help of a cyclic three-level structure is proposed. Non-resonant microwave pules are applied to drive the transition of chiral molecules from their ground states to dressed-states with different eigenenergies, which induce a large energy split in the levels of left-handed molecules. This dynamics helps to realize a chirality-selective transition, where only the right-handed molecules can be excited to the higher levels. By utilizing the SU(2)-transformation-based shortcuts to adiabaticity method and the systematic-error-sensitivity nullified optimal control method, systematic-error-resistant control pulses to realize maximal population difference between molecules with different chirality are designed. Numerical simulations show that the protocol is also insensitive to random noise and energy relaxation. Therefore, the protocol may provide a promising approach for rapid and robust chiral discrimination.
Keyword ：
adiabaticity adiabaticity chiral discrimination chiral discrimination optimal control optimal control
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| GB/T 7714 | Ding, Wei-Wei , Kang, Yi-Hao , Liu, Yang et al. Chiral Discrimination via Shortcuts to Adiabaticity and Optimal Control [J]. | ANNALEN DER PHYSIK , 2022 , 534 (6) . |
| MLA | Ding, Wei-Wei et al. "Chiral Discrimination via Shortcuts to Adiabaticity and Optimal Control" . | ANNALEN DER PHYSIK 534 . 6 (2022) . |
| APA | Ding, Wei-Wei , Kang, Yi-Hao , Liu, Yang , Song, Jie , Huang, Bi-Hua , Xia, Yan . Chiral Discrimination via Shortcuts to Adiabaticity and Optimal Control . | ANNALEN DER PHYSIK , 2022 , 534 (6) . |
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In this paper, we propose a protocol to generate steady Greenberger-Horne-Zeilinger (GHZ) states of three Rydberg atoms with dissipation dynamics and simplified Lyapunov control. Firstly, combining with the dissipation dynamics and Rydberg antiblockade, a unique and steady solution of the master equation of the system is obtained. Furthermore, to polish the convergence rate, we add well-designed additional coherent control (ACC) fields with Lyapunov control into the traditional dissipation process and simplify the control fields with bang-bang design proposed in the Ref. (Hou et al., 2012) for better experimental feasibility. Numerical simulation reveals that the GHZ states generation is prominently accelerated and the simplified control fields have the similar efficiency with the traditional Lyapunov control fields but are easier to realize in realistic situations. We hope this work could provide an alternative way to polish the generation of entanglement.
Keyword ：
Dissipation dynamic Dissipation dynamic Lyapunov control Lyapunov control Simplified control field Simplified control field
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| GB/T 7714 | Wang, Yu , Hu, Chang-Sheng , Shi, Zhi-Cheng et al. Simplified process of dissipation-based Greenberger-Horne-Zeilinger state generation with Lyapunov control [J]. | OPTICS COMMUNICATIONS , 2021 , 483 . |
| MLA | Wang, Yu et al. "Simplified process of dissipation-based Greenberger-Horne-Zeilinger state generation with Lyapunov control" . | OPTICS COMMUNICATIONS 483 (2021) . |
| APA | Wang, Yu , Hu, Chang-Sheng , Shi, Zhi-Cheng , Huang, Bi-Hua , Song, Jie , Xia, Yan . Simplified process of dissipation-based Greenberger-Horne-Zeilinger state generation with Lyapunov control . | OPTICS COMMUNICATIONS , 2021 , 483 . |
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In this paper, a flexible and effective scheme is proposed to realize nonadiabatic geometric quantum gates with the invariant based reverse engineering and the nonadiabatic holonomic quantum computation (NHQC+) presented in recent work [B.-J. Liu et al., Phys. Rev. Lett. 123, 100501 (2019)] for extensible geometric quantum computation. The scheme provides variabilities for most of control parameters, and can build up multiple evolution paths with different geometric phases acquired in a cycling evolution. As the computational basis can be covered by the evolution paths, the realization of the nonadiabatic geometric quantum computation is possible without auxiliary levels. Moreover, multiple types of nonadiabatic geometric quantum gates can also be easily constructed by only adjusting boundary conditions of control parameters with the method. To show the applications of the scheme, we discuss the implementations of nonadiabatic geometric quantum gates of spin qubits in a double-quantum-dot system with numerical simulations. The results indicate that the scheme possesses robustness against the errors and noise. Therefore, the scheme may offer some interesting perspectives for the realization of the nonadiabatic geometric quantum computation.
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| GB/T 7714 | Kang, Yi-Hao , Shi, Zhi-Cheng , Huang, Bi-Hua et al. Flexible scheme for the implementation of nonadiabatic geometric quantum computation [J]. | PHYSICAL REVIEW A , 2020 , 101 (3) . |
| MLA | Kang, Yi-Hao et al. "Flexible scheme for the implementation of nonadiabatic geometric quantum computation" . | PHYSICAL REVIEW A 101 . 3 (2020) . |
| APA | Kang, Yi-Hao , Shi, Zhi-Cheng , Huang, Bi-Hua , Song, Jie , Xia, Yan . Flexible scheme for the implementation of nonadiabatic geometric quantum computation . | PHYSICAL REVIEW A , 2020 , 101 (3) . |
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A protocol is proposed to realize one-step implementation of the N-qubit nonadiabatic holonomic quantum gates with superconducting qubits. The inverse Hamiltonian engineering is applied in designing microwave pulses to drive superconducting qubits. By combining curve fitting, the wave shapes of the designed pulses can be described by simple functions, which are not hard to realize in experiments. To demonstrate the effectiveness of the protocol, a three-qubit holonomic controlled pi-phase gate is taken as an example in numerical simulations. The results show that the protocol holds robustness against noise and decoherence. Therefore, the protocol may provide an alternative approach for implementing N-qubit nonadiabatic holonomic quantum gates.
Keyword ：
inverse hamiltonian engineering inverse hamiltonian engineering nonadiabatic holonomic quantum gate nonadiabatic holonomic quantum gate superconducting qubit superconducting qubit
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| GB/T 7714 | Kang, Yi-Hao , Chen, Ye-Hong , Shi, Zhi-Cheng et al. One-Step Implementation of N-Qubit Nonadiabatic Holonomic Quantum Gates with Superconducting Qubits via Inverse Hamiltonian Engineering [J]. | ANNALEN DER PHYSIK , 2019 , 531 (7) . |
| MLA | Kang, Yi-Hao et al. "One-Step Implementation of N-Qubit Nonadiabatic Holonomic Quantum Gates with Superconducting Qubits via Inverse Hamiltonian Engineering" . | ANNALEN DER PHYSIK 531 . 7 (2019) . |
| APA | Kang, Yi-Hao , Chen, Ye-Hong , Shi, Zhi-Cheng , Huang, Bi-Hua , Song, Jie , Xia, Yan . One-Step Implementation of N-Qubit Nonadiabatic Holonomic Quantum Gates with Superconducting Qubits via Inverse Hamiltonian Engineering . | ANNALEN DER PHYSIK , 2019 , 531 (7) . |
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