Error-rejecting quantum computing with solid-state spins assisted by low-Q optical microcavities

Abstract

We present an efficient proposal for error-rejecting quantum computing with quantum dots (QD) embedded in single-sided optical microcavities based on the interface between the circularly polarized photon and QDs. An almost unity fidelity of the quantum entangling gate (EG) can be implemented with a detectable error that leads to a recycling EG procedure, which improves further the efficiency of our proposal along with the robustness to the errors involved in imperfect input-output processes. Meanwhile, we discuss the performance of our proposal for the EG on two solid-state spins with currently achieved experiment parameters, showing that it is feasible with current experimental technology. It provides a promising building block for solid-state quantum computing and quantum networks.

8 pages, 3 figures

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• Error-heralded generation and self-assisted complete analysis of two-photon hyperentangled Bell states assisted by single-sided quantum-dot-cavity systems
• Entanglement purification of nonlocal quantum-dot-confined electrons assisted by double-sided optical microcavities
• Cumulative generation of maximal entanglement between spectrally distinct qubits using squeezed light
• Self-error-rejecting quantum state transmission of entangled photons for faithful quantum communication without calibrate reference frames