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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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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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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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Abstract ：
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 (LEP s ) and quantum dynamics, a near -perfect single -photon blockade (1PB) can be achieved. By fine-tuning system parameters to approach the second -order LEP (LEP 2 ), 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 LEP 2 . 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. (c) 2024 Optica Publishing Group
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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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In this work, we develop a supervised learning model for implementing robust quantum control in composite-pulse systems, where the training parameters can be either phases, detunings, or Rabi frequencies. This model exhibits great resistance to all kinds of systematic errors, including single, multiple, and time-varying errors. We propose a modified gradient descent algorithm for adapting the training of phase parameters, and show that different sampling methods result in different robust performances. In particular, there is a trade-off between high fidelity and robustness for a given number of training parameters, and both can be simultaneously enhanced by increasing the number of training parameters (pulses). For its applications, we demonstrate that the current model can be used for achieving high-fidelity arbitrary superposition states and universal quantum gates in a robust manner. This work provides a highly efficient learning model for fault-tolerant quantum computation by training various physical parameters.
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| GB/T 7714 | Shi, Zhi-Cheng , Ding, Jun -Tong , Chen, Ye-Hong et al. Supervised learning for robust quantum control in composite-pulse systems [J]. | PHYSICAL REVIEW APPLIED , 2024 , 21 (4) . |
| MLA | Shi, Zhi-Cheng et al. "Supervised learning for robust quantum control in composite-pulse systems" . | PHYSICAL REVIEW APPLIED 21 . 4 (2024) . |
| APA | Shi, Zhi-Cheng , Ding, Jun -Tong , Chen, Ye-Hong , Ding, Jun-Tong , Song, Jie , Xia, Yan et al. Supervised learning for robust quantum control in composite-pulse systems . | PHYSICAL REVIEW APPLIED , 2024 , 21 (4) . |
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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.
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| GB/T 7714 | Xiao, Yang , Kang, Yi-Hao , Zheng, Ri-Hua et al. Effective nonadiabatic holonomic SWAP gate with Rydberg atoms using invariant-based reverse engineering [J]. | PHYSICAL REVIEW A , 2024 , 109 (6) . |
| MLA | Xiao, Yang et al. "Effective nonadiabatic holonomic SWAP gate with Rydberg atoms using invariant-based reverse engineering" . | PHYSICAL REVIEW A 109 . 6 (2024) . |
| APA | Xiao, Yang , Kang, Yi-Hao , Zheng, Ri-Hua , Song, Jie , Chen, Ye-Hong , Xia, Yan . Effective nonadiabatic holonomic SWAP gate with Rydberg atoms using invariant-based reverse engineering . | PHYSICAL REVIEW A , 2024 , 109 (6) . |
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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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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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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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