Abstract

Heralded universal quantum gates can largely decrease the quantum resource consumed in the integration of a multiqubit quantum circuit. Here, we present a scheme for heralded universal quantum computing, including the construction of the CNOT gate, Fredkin gate, and Toffoli gate on the electron spins in diamond nitrogen-vacancy (NV) centers assisted by low-$ Q $ microtoroidal resonators. These quantum gates can achieve unity fidelity, as the infidelity induced by the imperfect input–output process is transferred into photon loss. The clicks on different single-photon detectors can either herald the success of the quantum gates or instruct an immediate recycling procedure, even without reinitializing the NV centers. Besides the heralding, this scheme is also more realistic, observing that the non-monochromatic auxiliary photon and the inhomogeneous NV centers have no adverse impact on fidelity. The high fidelity and efficiency with experimental parameters show that the scheme is feasible with current technology.

© 2020 Optical Society of America

Robust universal photonic quantum gates operable with imperfect processes involved in diamond nitrogen-vacancy centers inside low-Q single-sided cavities

Ming Li and Mei Zhang
Opt. Express 26(25) 33129-33141 (2018)

Scalable multi-qubit quantum gates in quantum networks based on the microtoroidal-resonator-mediated nitrogen-vacancy centers in diamond

Taian Wang and Yong Zhang
J. Opt. Soc. Am. B 37(5) 1372-1378 (2020)

Simple schemes for universal quantum gates with nitrogen-vacancy centers in diamond

Liu-Yong Cheng, Hong-Fu Wang, and Shou Zhang
J. Opt. Soc. Am. B 30(7) 1821-1826 (2013)

Heralded high-fidelity quantum hyper-CNOT gates assisted by charged quantum dots inside single-sided optical microcavities

Yu-Hong Han, Cong Cao, Ling Fan, and Ru Zhang
Opt. Express 29(13) 20045-20062 (2021)

Universal quantum gates on electron-spin qubits with quantum dots inside single-side optical microcavities

Hai-Rui Wei and Fu-Guo Deng
Opt. Express 22(1) 593-607 (2014)