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Quantum phase gate in decoherence-free subspace with cavity QED system
Authors:Wei Song  Ping Zou
Affiliation:Laboratory of Quantum Information Technology, ICMP and School of Physics and Telecommunication Engineering, South China Normal University, Guangzhou 510006, China
Abstract:We demonstrate how to perform quantum phase gate with cavity QED system in decoherence-free subspace by using only linear optics elements and photon detectors. The qubits are encoded in the singlet state of the atoms in cavities among spatially separated nodes, and the quantum interference of polarized photons decayed from the optical cavities is used to realized the desired quantum operation among distant nodes. In comparison with previous schemes, the distinct advantage is that the gate fidelity could not only resist collective noises, but also immune from atomic spontaneous emission, cavity decay, and imperfection of the photodetectors. We also discuss the experimental feasibility of our scheme.
Keywords:03.67.Hk   42.50.Dv
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