Universal remote quantum computation assisted by the cavity input–output process

Abstract

Quantum computing may provide potential superiority to solve some difficult problems. We propose a scheme for scalable remote quantum computation based on an interface between the photon and the spin of an electron confined in a quantum dot embedded in a microcavity. By successively interacting auxiliary photon pulses with spins charged in optical cavities, a prototypical quantum controlled-controlled flip gate (Toffoli gate) is achieved on a remote three-spin system using only one Einstein-Podolsky-Rosen entanglement, and local operations and classical communication. Our proposed model is shown to be robust to practical noise and experimental imperfections in current cavity-quantum electrodynamics techniques.

Distributed atomic quantum information processing via optical fibers

“…Zheng proposes an efficient scheme for quantum communication between two atoms trapped in distant cavities 30 . Moreover, flying single photons are also used for remote gates 31–35 .…”

Quantum Computation Based on Photons with Three Degrees of Freedom

“…Another diamond NV − center is proposed with six electrons from the nitrogen and three carbons surrounding the vacancy 42 , which is confined in a microtoroidal resonator (MTR) 43 with the quantized whispering-gallery mode (WGM). This useful system allows for an ultrahigh- Q and a small mode volume of WGM microresonators 44 45 46 , which has been applied to construct quantum gates on electron-spin qubits 47 48 or remote qubits 49 50 . Furthermore, recent experiments have assembled several hybrid systems, where colour centers in diamond nanocrystals or bulk diamond are coupled to the evanescent fields of cavities, which are defined in non-diamond materials coupling to WGMs in a silica micro-sphere 50 51 52 , diamond-GaP micro-disk 53 , GaP micro-ring cavities 54 , or SiN photonic crystal 55 .…”