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

摘要

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.