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学者姓名：夏岩
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Abstract ：
In this paper, we propose a one-step scheme for implementing the nonadiabatic holonomic swap gate with Rydberg atoms. By applying invariant-based reverse engineering to design the effective Hamiltonian of the system, a suitable evolution path for implementing nonadiabatic holonomic quantum computation is found. In addition, the systematic-error-sensitivity nullified optimal control method is considered in the parameter selections, so that the scheme is insensitive to the systematic error of pulses. We also estimate the effects of random noise, the random initial phase of the pulses, the Doppler shift, and decoherence on the scheme. The numerical results show that the scheme exhibits fairly good performance against these negative factors. Finally, we generalize the scheme to realize the non-Clifford swap gates. Therefore, this scheme can provide a feasible framework for implementing high-fidelity and robust swap gates and non-Clifford swap gates with Rydberg atoms. © 2024 American Physical Society.
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| GB/T 7714 | Xiao, Y. , Kang, Y.-H. , Zheng, R.-H. et al. Effective nonadiabatic holonomic swap gate with Rydberg atoms using invariant-based reverse engineering [J]. | Physical Review A , 2024 , 109 (6) . |
| MLA | Xiao, Y. et al. "Effective nonadiabatic holonomic swap gate with Rydberg atoms using invariant-based reverse engineering" . | Physical Review A 109 . 6 (2024) . |
| APA | Xiao, Y. , Kang, Y.-H. , Zheng, R.-H. , Song, J. , Chen, Y.-H. , Xia, Y. . Effective nonadiabatic holonomic swap gate with Rydberg atoms using invariant-based reverse engineering . | Physical Review A , 2024 , 109 (6) . |
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Noise is often considered as the biggest enemy of maintaining quantum coherence. However, in this paper, we show a scheme to protect quantum coherence by introducing extra noise. To be specific, we study an atom coupled to a single mode cavity (Jaynes-Cummings model) with two noises. One is from the cavity leakage, the other is from the stochastic atom-cavity coupling. Based on the non-Markovian dynamical equation, we show the quantum coherence can be protected by introducing the noise in the atom-cavity coupling. We study four different types of noises and show their performance on the coherence protection. We also analytically reveal the mechanism of the quantum coherence protection, namely the high frequency noise can freeze the dynamics thus protect coherence. Last but not least, a mixture of different types of noises (hybrid noise) is studied. We show the mixture can lower the performance of the coherence protection scheme and provide an explanation. We hope the results presented here may attract more attention on protecting quantum coherence by utilizing noise. © 2024 Astro Ltd. All rights, including for text and data mining, AI training, and similar technologies, are reserved.
Keyword ：
coherence protection coherence protection noise noise non-Markovian non-Markovian
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| GB/T 7714 | Feng, J. , Guo, T. , Zhou, Y. et al. Quantum coherence protection by utilizing hybrid noise [J]. | Laser Physics Letters , 2024 , 21 (10) . |
| MLA | Feng, J. et al. "Quantum coherence protection by utilizing hybrid noise" . | Laser Physics Letters 21 . 10 (2024) . |
| APA | Feng, J. , Guo, T. , Zhou, Y. , Zhao, X. , Xia, Y. . Quantum coherence protection by utilizing hybrid noise . | Laser Physics Letters , 2024 , 21 (10) . |
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In this paper, a one-step protocol is proposed for the parity measurement of N cat-state qubits which are encoded on the cat states of the modes in superconducting Kerr-nonlinear cavities. The parity measurement is performed with the help of an auxiliary qutrit. Especially, the auxiliary qutrit can (cannot) be excited to the higher-energy levels when the cat-state qubits are in the even- (odd-) parity state. By designing the Rabi frequency of the classical fields via reverse engineering and optimal control, the qutrit is driven to an excited dressed state in the even-parity case, which is robust to the systematic errors of the qutrit-cavity coupling strengths. Accordingly, the parity of the cat-state qubits can be distinguished with high accuracy by measuring the final population of the ground state of the auxiliary qutrit. Numerical simulations also show that the protocol is insensitive to the systematic errors of the classical fields, the inhomogeneity of the coupling strengths, intercavity cross talk, unwanted qutrit transitions, and decoherence. Therefore, the protocol may provide an effective approach for parity measurement of multiple cat-state qubits.
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| GB/T 7714 | Li, Dong-Sheng , Kang, Yi-Hao , Chen, Ye-Hong et al. One-step parity measurement of N cat-state qubits via reverse engineering and optimal control [J]. | PHYSICAL REVIEW A , 2024 , 109 (2) . |
| MLA | Li, Dong-Sheng et al. "One-step parity measurement of N cat-state qubits via reverse engineering and optimal control" . | PHYSICAL REVIEW A 109 . 2 (2024) . |
| APA | Li, Dong-Sheng , Kang, Yi-Hao , Chen, Ye-Hong , Liu, Yang , Zhang, Cheng , Wang, Yu et al. One-step parity measurement of N cat-state qubits via reverse engineering and optimal control . | PHYSICAL REVIEW A , 2024 , 109 (2) . |
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A protocol is proposed for generating three-particle Knill-Laflamme-Milburn (KLM) states in a system composed of two frequency-tunable flux qubits and a coplanar waveguide resonator. With the help of the counter-rotating interaction, the protocol for generating three-particle KLM states can be realized. The numerical results reveal that the protocol is robust against the effects induced by decoherence and frequency-tuning operations. It is hope that the protocol provides an alternative method to generate entangled states. The mixture of longitude and transverse coupling between qubits and resonators, i.e., a counter-rotating interaction, contains high-order nonlinear processes. Based on this interaction, this article explores an efficient protocol to generate multi-particle Knill-Laflamme-Milburn states in the system consisted of two flux qubits and a resonator. The numerical results reveal the effectiveness and robustness of the protocol. image
Keyword ：
circuit QED circuit QED counter-rotating interation counter-rotating interation Knill-Laflamme-Milburn states Knill-Laflamme-Milburn states Schrieffer-Wolff transformation Schrieffer-Wolff transformation
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| GB/T 7714 | Liu, Yang , Shi, Zhi-Cheng , Song, Jie et al. Generation of Multiparticle Knill-Laflamme-Milburn States in Circuit QED via Counter-Rotating Interactions [J]. | ADVANCED QUANTUM TECHNOLOGIES , 2024 , 7 (7) . |
| MLA | Liu, Yang et al. "Generation of Multiparticle Knill-Laflamme-Milburn States in Circuit QED via Counter-Rotating Interactions" . | ADVANCED QUANTUM TECHNOLOGIES 7 . 7 (2024) . |
| APA | Liu, Yang , Shi, Zhi-Cheng , Song, Jie , Chen, Ye-Hong , Xia, Yan . Generation of Multiparticle Knill-Laflamme-Milburn States in Circuit QED via Counter-Rotating Interactions . | ADVANCED QUANTUM TECHNOLOGIES , 2024 , 7 (7) . |
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We propose a robust and high-fidelity scheme for realizing universal quantum gates by optimizing short pulse sequences in a three-level system. To alleviate the sensitivity to the errors, we recombine all elements of error matrices to construct a cost function with three types of weight factors. The modulation parameters are obtained by searching for the minimum value of this cost function. The purposes of introducing the weight factors are to reduce the detrimental impact of high-order error matrices, suppress population leakage to the third state, correct the operational error in the qubit space, and optimize the total pulse area of short pulse sequences. The results demonstrate that the optimized sequences exhibit strong robustness against errors and effectively reduce the total pulse area. Therefore, this work presents a valuable method for achieving exceptional robustness and high speed in quantum computations.
Keyword ：
composite pulse composite pulse optimal control optimal control robust quantum control robust quantum control
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| GB/T 7714 | Zhang, Cheng , Liu, Yang , Song, Jie et al. High-fidelity quantum gates via optimizing short pulse sequences in three-level systems [J]. | NEW JOURNAL OF PHYSICS , 2024 , 26 (1) . |
| MLA | Zhang, Cheng et al. "High-fidelity quantum gates via optimizing short pulse sequences in three-level systems" . | NEW JOURNAL OF PHYSICS 26 . 1 (2024) . |
| APA | Zhang, Cheng , Liu, Yang , Song, Jie , Xia, Yan , Shi, Zhi-Cheng . High-fidelity quantum gates via optimizing short pulse sequences in three-level systems . | NEW JOURNAL OF PHYSICS , 2024 , 26 (1) . |
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We propose a protocol for robust quantum state engineering using composite pulses (CPs) in four-level systems. The analytical expression of the propagator is derived for the implementation of universal single-qubit gates and the maximum superposition state. By carefully designing the relative phases between pulses, the CP sequences can compensate for the pulse area error to any desired order. We present two classes of CP sequences, one generating robust population inversion and the other generating robust superposition states. As applications, we employ the well-designed CP sequences to achieve the conversion of the W and Greenberger-Horne-Zeilinger states with high fidelity in a Rydberg atomic system. It is shown that the CP sequences yield excellent robustness with respect to the pulse area errors, and they possess a short evolution time.
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| GB/T 7714 | Shi, Zhi-Cheng , Wang, Jian-Hui , Zhang, Cheng et al. Universal composite pulses for robust quantum state engineering in four-level systems [J]. | PHYSICAL REVIEW A , 2024 , 109 (2) . |
| MLA | Shi, Zhi-Cheng et al. "Universal composite pulses for robust quantum state engineering in four-level systems" . | PHYSICAL REVIEW A 109 . 2 (2024) . |
| APA | Shi, Zhi-Cheng , Wang, Jian-Hui , Zhang, Cheng , Song, Jie , Xia, Yan . Universal composite pulses for robust quantum state engineering in four-level systems . | PHYSICAL REVIEW A , 2024 , 109 (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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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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We investigate the dynamical blockade in a nonlinear cavity and demonstrate the connection between the correlation function g(2)(t) and system parameters in the entire nonlinear region. Utilizing the Liouville exceptional points (LEPs) and quantum dynamics, a near-perfect single-photon blockade (1PB) can be achieved. By fine-tuning system parameters to approach the second-order LEP (LEP2), we improved single-photon statistics in both weak and strong nonlinearity regimes, including a significant reduction of g(2)(t) and a pronounced increase in the single-photon occupation number. In the strong nonlinearity region, the maximum photon population may correspond to stronger antibunching effect. Simultaneously, the time window and period of blockade can be controlled by selecting detuning based on the LEP2. Furthermore, the 1PB exhibits robustness against parameter fluctuations, and this feature can be generalized to systems for implementing single-photon sources with nonharmonic energy levels. © 2024 Optica Publishing Group.
Keyword ：
Particle beams Particle beams Photons Photons
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| GB/T 7714 | Geng, Zhuang , Chen, Yongjian , Jiang, Yongyuan et al. Engineering dynamical photon blockade with Liouville exceptional points [J]. | Optics Letters , 2024 , 49 (11) : 3026-3029 . |
| MLA | Geng, Zhuang et al. "Engineering dynamical photon blockade with Liouville exceptional points" . | Optics Letters 49 . 11 (2024) : 3026-3029 . |
| APA | Geng, Zhuang , Chen, Yongjian , Jiang, Yongyuan , Xia, Yan , Song, Jie . Engineering dynamical photon blockade with Liouville exceptional points . | Optics Letters , 2024 , 49 (11) , 3026-3029 . |
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Hybridized magnonic-photonic systems are key components for future information-processing technologies such as storage, manipulation, or conversion of data in the quantum regime owing to its ability to achieve collective excitation of spin waves and excellent properties of low damping rate, high spin density, and highly tunable excitations. We propose to realize fast and controllable topological single- and multiexcitation quantum state transfers (QSTs) through a magnon-circuit-QED chain. Various time-dependent magnon-photon and photon-photon couplings are tailored via the Kerr nonlinearity of the magnons and superconducting quantum interference devices, which are implemented fast magnon-magnon excitation transfers by mapping the system to a Su-Schrieffer-Heeger model. We analytically derive the edge state of the system, qualitatively explain the mechanism of fast QST, and numerically show the robustness of QST against on-site potential defects, the fluctuation of couplings, and losses of the system. Furthermore, when larger on-site defects are added to different types of lattice sites in the two ends, alternative singleexcitation controllable magnon-photon, photon-magnon, and photon-photon transfers are also accessible. Our work opens up prospects for realizing a fast and controllable quantum channel in magnon-circuitQED system and for facilitating further applications of topological matter in robust quantum information processing in magnonics and photonics.
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| GB/T 7714 | Han, Jin-Xuan , Wu, Jin-Lei , Yuan, Zhong-Hui et al. Fast and controllable topological excitation transfers in hybrid magnon-photon systems [J]. | PHYSICAL REVIEW APPLIED , 2024 , 21 (1) . |
| MLA | Han, Jin-Xuan et al. "Fast and controllable topological excitation transfers in hybrid magnon-photon systems" . | PHYSICAL REVIEW APPLIED 21 . 1 (2024) . |
| APA | Han, Jin-Xuan , Wu, Jin-Lei , Yuan, Zhong-Hui , Chen, Yong-Jian , Xia, Yan , Jiang, Yong -Yuan et al. Fast and controllable topological excitation transfers in hybrid magnon-photon systems . | PHYSICAL REVIEW APPLIED , 2024 , 21 (1) . |
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