Atomic Bell state and GHZ state analyzers based on cavity input–output processes

Abstract

Abstract: Non-destructive identification of entanglement is very important in quantum information processing. The scheme constructed a controlled phase shifter (CPS) gate via the cavity input–output process. The CPS gate can be used to construct a parity analyzer (PA) with homodyne detection technology. Moreover, it used the PAs, combined with some other operations, to construct the non-destructive atomic Bell states and GHZ states analyzers. The scheme has two advantages:（1）It used the coherent light and homodyne detection, which are much easier to be implemented than single photon source and single photon detection. (2)The atomic Bell states and GHZ states analyzers we realized are non-destructive. All the methods and techniques used in this scheme are achievable in the present experiment.

Key words: quantum optics, Bell states analyzer, GHZ states analyzer, cavity input–output process, controlled phase shifter

CLC Number:

O431.2

LI Ai-li YU Ya-fei ZHANG Zhi-ming. Atomic Bell state and GHZ state analyzers based on cavity input–output processes[J]. J4, 2014, 31(1): 69-74.

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