Robust-fidelity hyperparallel controlled-phase-flip gate through microcavities

TL;DR

This paper proposes a robust hyperparallel optical controlled-phase-flip gate using microcavities that operates on polarization and spatial degrees of freedom, achieving high fidelity and heralded success for quantum information processing.

Contribution

It introduces a novel method for implementing a hyperparallel controlled-phase-flip gate with microcavities, ensuring unity fidelity and preventing undesired photon interactions.

Findings

Gate acts on polarization and spatial DOFs simultaneously

Unity fidelity can be achieved in principle

Gate success is heralded by single-photon detectors

Abstract

Hyperparallel quantum information processing outperforms its traditional parallel one in terms of channel capacity, low loss rate, and processing speed. We present a way for implementing a robust hyper-parallel optical controlled-phase-flip gate through microcavities. The gate acts on polarization and spatial degrees of freedom (DOFs) simultaneously, and the incomplete and undesired interactions between photons and quantum dots are prevented. Interestingly, the unity fidelity of the gate can be achieved in principle, and the success of the gate is heralded by the single-photon detectors.