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Jiangxi kexue

Teleportation of N-qubit GHZ State Without Bell-state Measurement in Cavity QED

Ai-Xi Chen

Published Jan 1, 2011• 0 citations
OpenAlex

Abstract

We design a scheme to transfer N-qubit GHZ state in cavity quantum electrodynamics(QED).By selecting the right Hamiltonian,without Bell-state measurement,the N-qubit GHZ state can be teleported from atom A to atom B.Of course,the demand is that we should choose the right time between the cavity and the atom in the process of transmission.

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We design a scheme to transfer N-qubit GHZ state in cavity quantum electrodynamics(QED).By selecting the right Hamiltonian,without Bell-state measurement,the N-qubit GHZ state can be teleported from atom A to atom B.Of course,the demand is that we should choose the right time between the cavity and the atom in the process of transmission.
A scheme for approximately and conditionally teleporting an unknown atomic-entangled state in cavity QED is proposed. It is the novel extension of the scheme of [ Phys. Rev. A 69 (2004) 064302], where the state to be teleported is an unknown atomic state and where only a time point of system evolution and the corresponding fidelity implementing the teleportation are given. In fact, there exists multi-time points and the corresponding fidelities, which are shown in this paper and then are used to realize the approximate and conditional teleportation of the unknown atomic-entangled state. Naturally, our scheme does not involve the Bell-state measurement or an additional atom, which is required in the Bell-state measurement, only requiring one single-mode cavity. The scheme may be generalized to not only the teleportation of the cavity-mode-entangled-state by means of a single atom but also the teleportation of the unknown trapped-ion-entangled-state in a linear ion trap and the teleportation of the multi-atomic entangled states included in generalized GHZ states.
An alternative scheme is presented for teleportation of a two-atom entangled state in cavity quantum electrodynamics (QED). It is based on the resonant atom–cavity field interaction. In the scheme, only one cavity is involved, and the number of the atoms needed to be detected is decreased compared with the previous scheme. Since the resonant atom–cavity field interaction greatly reduces the interaction time, the decoherence effect can be effectively suppressed during the teleportation process. The experimental feasibility of the scheme is discussed. The scheme can easily be generalized to the teleportation of N-atom Greeninger–Horne–Zeilinger (GHZ) entangled states. The number of atoms needed to be detected does not increase as the number of the atoms in the GHZ state increases.