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Journal of Fujian Normal University

Generation of Maximally Entangled States Via Entanglement Swapping

Zhiping Huang

Published Jan 1, 2007• 0 citations
OpenAlex

Abstract

A relatively simple scheme for generating maximally entangled photon-photon and atom-photon states via entanglement swapping using techniques of cavity QED is proposed.The scheme of preparing the maximally entangled photon-photon state does not require the transfer of quantum information between the atoms and cavity.In the scheme the cavity is only virtually excited and thus the requirement on the quality factor of the cavity is greatly loosened.The scheme of preparing the maximally entangled atom-photon state based on the two-photon JaynesCummings model only requires detecting the state of the single atom rather than a joint-Bell measurement.

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A relatively simple scheme for generating maximally entangled photon-photon and atom-photon states via entanglement swapping using techniques of cavity QED is proposed.The scheme of preparing the maximally entangled photon-photon state does not require the transfer of quantum information between the atoms and cavity.In the scheme the cavity is only virtually excited and thus the requirement on the quality factor of the cavity is greatly loosened.The scheme of preparing the maximally entangled atom-photon state based on the two-photon JaynesCummings model only requires detecting the state of the single atom rather than a joint-Bell measurement.
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.