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学者姓名：夏岩
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Abstract ：
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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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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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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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, 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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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 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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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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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 . |
| MLA | Wang, Jian-Hui et al. "Robust Quantum State Manipulation by Composite Pulses in Five-Level Systems" . | ADVANCED QUANTUM TECHNOLOGIES (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 . |
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