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Chinese Physics

Entanglement swapping without joint measurement via a Λ-type atom interacting with bimodal cavity field

Lin Xiu, Hongcai Li, Rong‐Can Yang, Zhiping Huang

Published Mar 20, 2007• 9 citations
Publisher

Abstract

This paper proposes a scheme for realizing entanglement swapping in cavity QED. The scheme is based on the resonant interaction of a two-mode cavity field with a Λ-type three-level atom. In contrast with the previously proposed schemes, the present scheme is ascendant, since the fidelity is 1.0 and the joint measurement isn't needed. And the scheme is experimentally feasible based on the current cavity QED technique.

DOI
10.1088/1009-1963/16/4/009

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This paper proposes a scheme for realizing entanglement swapping in cavity QED. The scheme is based on the resonant interaction of a two-mode cavity field with a Λ-type three-level atom. In contrast with the previously proposed schemes, the present scheme is ascendant, since the fidelity is 1.0 and the joint measurement isn't needed. And the scheme is experimentally feasible based on the current cavity QED technique.
This paper proposes a scheme where entanglement swapping between atom and cavity can be realized. Λ-type three-level atoms interacting resonantly with cavity field are considered. By detecting atom and cavity field, it realizes entanglement swapping between atom and cavity. It uses the technique of entanglement swapping to generate an entangled state of two cavity fields by measuring on atoms. It discusses the experimental feasibility of the proposed scheme and application of entangled state of cavity fields.
We propose an entanglement swapping scheme in cavity QED.The different degree entanglement between atoms that never directly interacted can be realized,the unknown entanglement state can be transferred on atoms that never directly interacted.In the scheme,the previously used joint measurement is not needed.Only single measurement on atom is needed in realizing the swapping process.During the interaction between atom and cavity,the cavity is only virtually excited and thus the scheme is insensitive to the cavity field states and cavity decay.