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Laser Physics Letters

Entanglement concentration of unknown states via the quantum dot plus double-sided cavity system

Xiao-Jie Yuan, Ming Yang, Ping Dong, Zhuo‐Liang Cao

Published Oct 14, 2015• 4 citations

Abstract

In this letter we propose a scheme of entanglement concentration via entanglement swapping in the quantum dot (QD) plus double-sided cavity system with the help of an input photon. With our scheme, bipartite maximally entangled states among two spatially separated particles can be generated without direct interaction and initial entanglement. Moreover, four-particle maximally entangled states can be created too. Contrary to previous work investigating entanglement concentration in QD systems, the non-maximally entangled state to be concentrated can be unknown for us; furthermore, the complicated Bell-state measurement of entanglement swapping is replaced by single-photon detection, which will greatly reduce the realisation complexity of the current scheme.

DOI: 10.1088/1612-2011/12/11/115204

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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.

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