High-fidelity universal quantum gates for hybrid systems via the practical photon scattering

doi:10.1088/1674-1056/ac8734

摘要/Abstract

摘要： High-fidelity quantum logic gates are essential in quantum computation, and both photons and electron spins in quantum dots (QDs) have their own unique advantages in implementing quantum computation. It is of critical significance to achieve high-fidelity quantum gates for photon-QD hybrid systems. Here, we propose two schemes for implementing high-fidelity universal quantum gates including Toffoli gate and Fredkin gate for photon-QD hybrid systems, utilizing the practical scattering of a single photon off a QD-cavity system. The computation errors from the imperfections involved in the practical scattering are detected and prevented from arising in the final results of the two gates. Accordingly, the unity fidelity of each quantum gate is obtained in the nearly realistic condition, and the requirement for experimental realization is relaxed. Furthermore, the quantum circuits for the two gates are compact and no auxiliary qubits are required, which would also be the advantages regarding their experimental feasibility. These features indicate that our schemes may be useful in the practical quantum computation tasks.

关键词: quantum computation, quantum dot, photon, microcavity

Abstract: High-fidelity quantum logic gates are essential in quantum computation, and both photons and electron spins in quantum dots (QDs) have their own unique advantages in implementing quantum computation. It is of critical significance to achieve high-fidelity quantum gates for photon-QD hybrid systems. Here, we propose two schemes for implementing high-fidelity universal quantum gates including Toffoli gate and Fredkin gate for photon-QD hybrid systems, utilizing the practical scattering of a single photon off a QD-cavity system. The computation errors from the imperfections involved in the practical scattering are detected and prevented from arising in the final results of the two gates. Accordingly, the unity fidelity of each quantum gate is obtained in the nearly realistic condition, and the requirement for experimental realization is relaxed. Furthermore, the quantum circuits for the two gates are compact and no auxiliary qubits are required, which would also be the advantages regarding their experimental feasibility. These features indicate that our schemes may be useful in the practical quantum computation tasks.

Key words: quantum computation, quantum dot, photon, microcavity

中图分类号: (Quantum computation architectures and implementations)

03.67.Lx

03.67.Pp (Quantum error correction and other methods for protection against decoherence)

Jun-Wen Luo(罗竣文) and Guan-Yu Wang(王冠玉). High-fidelity universal quantum gates for hybrid systems via the practical photon scattering[J]. 中国物理B, 2023, 32(3): 30303-030303.

Jun-Wen Luo(罗竣文) and Guan-Yu Wang(王冠玉). High-fidelity universal quantum gates for hybrid systems via the practical photon scattering[J]. Chin. Phys. B, 2023, 32(3): 30303-030303.

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