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Journal of Fujian Normal University

Teleportation of Quantum States with Nonmaximally Entangled Quantum Channel——Teleportation of an Unknown Atom State Via a Tripartite Nonmaximally Entangled GHZ State in Cavity QED

Xiu‐Min Lin

Published Jan 1, 2008• 0 citations
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Abstract

The article discusses a probability teleportation scheme for an unknown single-atom state and an unknown two-atom entangled state via a tripartite nonmaximally entangled GHZ state in cavity QED.In the process of teleportation of quantum states we have to introduce an ancillary qubit to solve quantum state distortion problems caused by the use of nonmaximally entangled quantum channel.In this scheme,the two identical two-level atoms simultaneously interact with a single-mode cavity and are driven by a strongly classical field.The atomic state evolution is independent of the cavity field state and not affected by the cavity decay and the thermal field.

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Communications in Theoretical Physics•Sep 1, 2007•3 citations
The article discusses a probability teleportation scheme for an unknown single-atom state and an unknown two-atom entangled state via a tripartite nonmaximally entangled GHZ state in cavity QED.In the process of teleportation of quantum states we have to introduce an ancillary qubit to solve quantum state distortion problems caused by the use of nonmaximally entangled quantum channel.In this scheme,the two identical two-level atoms simultaneously interact with a single-mode cavity and are driven by a strongly classical field.The atomic state evolution is independent of the cavity field state and not affected by the cavity decay and the thermal field.
Teleportation schemes with a tripartite entangled state in cavity QED are investigated. The schemes do not need Bell state measurements and the successful probabilities reach optimality. In addition, the schemes are insensitive to both the cavity decay and the thermal field. We first consider two teleportation schemes via a tripartite GHZ state. The first one is a controlled one for an unknown single-qubit state. The second scheme is teleportation of unknown two-atom entangled state. Then we consider teleporting of single-qubit arbitrary state via a tripartite W state.
We present a scheme for realizing probabilistic teleportation of an unknown N -atom state via cavity QED. This scheme requires only a nonmaximally entangled pair to be used as a quantum channel, so the requirement of entanglement is reduced. In addition, our scheme does not involve the Bell-state measurement and is insensitive to the cavity decay, which is important from the experimental point of view. If the quantum channel is a two-atom maximally entangled state, teleportation of an unknown N -atom state can be realized by a simpler scheme via cavity QED.
We propose a scheme for the teleportation of an unknown two-particle entangled EPR state without the Bell-state measurement.Alice needs to teleport an unknown two-particle EPR state to Bob.Her atoms and Bob's are prepared in the maximal entangled GHZ state,which forms the quantum channel.She sends two atoms through a single-mode cavity field,and drives them by a strong classical field at the same time.Throngh the interaction between the atoms and the cavity,the states of these atoms are evolved.After the interaction,Alice realizes the teleportation successfully.In the scheme,the effects of thermal field and cavity decay are all eliminated.The success probability is 1.0,and the fidelity is 1.0 too.
We propose a scheme for the teleportation of an arbitrary two-atom entangled state |ϕ〉12 = a|gg〉12 + b|ge〉12 + c|eg〉12 + d|ee〉12 in driven QED. Two pairs of maximally two-atom entangled state are required as the quantum channel. This scheme does not involve apparent (or direct) Bell-state measurement and is insensitive to the cavity decay and the thermal field. Meanwhile this approach can be used to teleport the unknown multipartite GHZ state. The probability of success in our scheme can reach 1.0.