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Physical Review A

Conditional quantum phase gate using distant atoms and linear optics

Xu‐Bo Zou, Wolfgang M. Mathis

Published Apr 21, 2005• 36 citations
Publisher

Abstract

A scheme is proposed to implement a conditional quantum phase gate between atoms trapped in spatially separated cavities. Instead of direct interaction between atoms, quantum interference of polarized photons decayed from the optical cavities is used to realize the desired quantum operation between two distant atoms. The scheme requires a twofold coincidence detection, and is insensitive to the imperfection of the photon detectors.

DOI
10.1103/physreva.71.042334

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We propose a scheme for implementing conditional quantum phase gates for two four-state atoms trapped in a cavity. The two ground states of the atoms are coupled through two Raman processes induced by the cavity mode and two classical fields. Under certain conditions nonresonant Raman processes lead to two-atom coupling and can be used to produce conditional phase gates. The scheme is insensitive to cavity decay, thermal photons, and atomic spontaneous emission. The scheme does not require individual addressing of the atoms.