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Protected two-qubit entangling gate with mechanical driven continuous dynamical decoupling

Communications in Theoretical Physics 2022年第6期74卷 21-30页

作者： Xue-Jian Sun Wen-Xiao Liu Hao Chen Cheng-Yuan Wang Hui-Zhong Ma Hong-Rong Li College of Physics and Telecommunication Engineering Zhoukou Normal UniversityZhoukou 466001China Department of Physics and Electronics North China University of Water Resources and Electric PowerZhengzhou 450046China College of Physics and Electronic Information Engineering Qinghai Normal UniversityXining 810008China Institute of Quantum Optics and Quantum Information School of PhysicsXi'an Jiaotong UniversityXi'an 710049China

In this work, we propose a high-fidelity phonon-mediated entangling gate in a hybrid mechanical system based on two silicon-vacancy color centers in diamond. In order to suppress the influence of the spin decoherence on the entangling gate, we use a continuous dynamical decoupling approach to create new dressed spin states, which are less sensitive to environmental fluctuations and exhibit an extended T_(2)^(*) spin dephasing time. The effective spin-spin Hamiltonian modified by the mechanical driving field and the corresponding master equation are derived in the dispersive regime. We show that in the presence of the mechanical driving field, the effective spin-spin coupling can be highly controlled. By calculating the entangling gate fidelity in the dressed basis, we find that once the mechanical field is turned on, the gate fidelity can be significantly improved. In particular, under an optimized spin-phonon detuning and a stronger Rabi frequency of the mechanical driving field, the two-qubit gate is capable of reaching fidelity exceeding 0.99. Moreover, by employing appropriate driving modulation, we show that a highfidelity full quantum gate can be also realized, in which the initial and final spin states are on a bare basis. Our work provides a promising scheme for realizing high-fidelity quantum information processing.

关键词： silicon-vacancy color centers high-fidelity entangling gate mechanical driving modulation quantum information processing

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