Published in

Optica, Optics Express, 16(24), p. 18619, 2016

DOI: 10.1364/oe.24.018619

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Hyper-parallel Toffoli gate on three-photon system with two degrees of freedom assisted by single-sided optical microcavities

Journal article published in 2016 by Hai-Rui Wei, Fu-Guo Deng ORCID, Gui Lu Long ORCID
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

Encoding qubits in multiple degrees of freedom (DOFs) of a quantum system allows less-decoherence quantum information processing with much less quantum resources. We present a compact and scalable quantum circuit to determinately implement a hyper-parallel controlled-controlled-phase-flip (hyper-$\rm{C^2PF}$) gate on a three-photon system in both the polarization and spatial DOFs. In contrast with the one with many qubits encoding in one DOF only, our hyper-$\rm{C^2PF}$ gate operating two independent $\rm{C^2PF}$ gates on a three-photon system with less decoherence, and reduces the quantum resources required in quantum information processing by a half. Additional photons, necessary for many approaches, are not required in the present scheme. Our calculation shows that this hyper-$\rm{C^2PF}$ gate is feasible in experiment. ; Comment: 13 page, 3 figures