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New Journal of Physics

Scheme for teleporting an arbitrary superposition of atomic Dicke states via multi-fold coincidence detection

XuBo Zou, Jing Shu, Guang‐Can Guo

Published Oct 23, 2006• 3 citations
Publisher

Abstract

We propose a novel scheme for teleporting an arbitrary superposition of two-atom Dicke states with atoms trapped in optical cavities. The scheme requires a multi-fold coincidence detection and is insensitive to the imperfection of the photon detectors, and the fidelity is unity for any superposition of Dicke states. Further, we also point out that scheme can be extended to teleport an arbitrary superposition of N -atom Dicke states with unit fidelity.

DOI
10.1088/1367-2630/8/10/246

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We propose a novel scheme for teleporting an arbitrary superposition of two-atom Dicke states with atoms trapped in optical cavities. The scheme requires a multi-fold coincidence detection and is insensitive to the imperfection of the photon detectors, and the fidelity is unity for any superposition of Dicke states. Further, we also point out that scheme can be extended to teleport an arbitrary superposition of N -atom Dicke states with unit fidelity.
We propose a scheme for teleporting an arbitrary superposition of entangled Dicke states of any number of atoms (qubits) between two distant cavities. Our method relies on adiabatic passage using multi-atom dark states in each cavity, and a conditional detection of photons leaking out of both cavities. The ideal success probability of the protocol decreases polynomially in the number of atoms. The fidelity is unity for a single Dicke state, and can be optimized for the superposition by unitary postprocessing. Issues of experimental feasibility and applications to quantum informatics are discussed.
This paper proposes a scheme to teleport an arbitrary multi-particle two-level atomic state between two parties or an arbitrary zero- and one-photon entangled state of multi-mode between two high-Q cavities in cavity QED. This scheme is based on the resonant interaction between atom and cavity and does not involve Bell-state measurement. It investigates the fidelity of this scheme and find out the case of this unity fidelity of this teleportation. Considering the practical case of the cavity decay, this paper finds that the condition of the unity fidelity is also valid and obtains the effect of the decay of the cavity on the successful probability of the teleportation.
We propose a scheme for the quantum teleportation of an atomic state based on the detection of cavity decay. The internal state of an atom trapped in a cavity can be disembodiedly transferred to another atom trapped in a distant cavity by measuring interference of polarized photons through single-photon detectors. In comparison with the original proposal by Bose, Knight, Plenio, and Vedral [Phys. Rev. Lett. 83, 5158 (1999)], our protocol of teleportation has a high fidelity of almost unity, and inherent robustness, such as the insensitivity of fidelity to randomness in the atom's position, and to detection inefficiency. All these favorable features make the scheme feasible with the current experimental technology.
We give the detailed study of a scheme to efficiently engineer multi-atom entanglement by detecting the cavity decay through single-photon detectors. The scheme can be used to prepare arbitrary superpositions of multi-atom Dicke states, without the requirements of high-efficiency detection, separate addressing of different atoms, and full localization of the atoms to the Lamb-Dicke limit. We analyze in detail various sources of noise and imperfections in this experimental scheme, and show that the scheme is robust to the dominant sources of noise and realizable with the state of the art technology.