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arXiv:1005.1189

Entanglement swapping of atomic states through the photonic Faraday rotation

W. P. Bastos, Wesley Bueno Cardoso, Ardiley Torres Avelar, B. Baseia

Published May 7, 2010• 0 citations
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Abstract

We propose an entanglement swapping of atomic states confined by cavities QED using a photonic Faraday rotation. Two schemes are considered in which we use three and four cavities, respectively, plus an additional circularly-polarized photon. After interacting with an atom trapped inside the cavity the system evolves to an entangled atom-photon state. The entanglement swapping is then achieved by a Bell-state measurement upon the entire atom-photon state.

DOI
10.48550/arxiv.1005.1189

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We propose an entanglement swapping of atomic states confined by cavities QED using a photonic Faraday rotation. Two schemes are considered in which we use three and four cavities, respectively, plus an additional circularly-polarized photon. After interacting with an atom trapped inside the cavity the system evolves to an entangled atom-photon state. The entanglement swapping is then achieved by a Bell-state measurement upon the entire atom-photon state.
We propose a scheme for realizing quantum entanglement swapping between the atoms in cavity QED. With only virtual excitation of the cavity during the interaction between the atoms and cavity, the scheme is insensitive to the cavity mode states and the cavity decay. The ideas can also be utilized for realizing entanglement swapping between the atomic levels in a single atom and the atomic levels in the Bell states and between the atomic levels in the Bell states and the atomic levels in the W states.
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By utilizing Faraday rotation of photons, we present a highly efficient protocol for entanglement concentration of atomic Bell states, which departs from the conventional method of sequential interactions between the auxiliary photon and two optical cavities. Instead, the simultaneous interaction of the auxiliary photon with two atomic cavities is involved in order to significantly reduce the time requirement for achieving atomic Bell state entanglement concentration. By employing iterative applications of the protocol for entanglement concentration, the discarded states can be repeatedly concentrated, efficiently increasing the probability of success. Furthermore, our entanglement concentration protocols (ECPs) operate in low-Q cavities, which are easier to implement in practical applications than high-Q cavities. Finally, it can be generalized to an N -atom GHZ states entanglement concentration protocol.