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Teleportation of an atomic state via cavity decay

Sougato Bose, P. L. Knight, Martin Bodo Plenio, Vlatko Vedral

Published Aug 1, 1999• 0 citations
OpenAlex

Abstract

We show how the state of an atom trapped in a cavity can be teleported to an atom trapped in a distant cavity simply by detecting photon decays from the cavities. This is a rare example of a decay mechanism being made to play a constructive role in quantum information processing. The scheme is comparatively easy to implement, requiring the minimal technology of being able to trap a single three level atom in a cavity.

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We show how the state of an atom trapped in a cavity can be teleported to an atom trapped in a distant cavity simply by detecting photon decays from the cavities. This is a rare example of a decay mechanism being made to play a constructive role in quantum information processing. The scheme is comparatively easy to implement, requiring the minimal technology of being able to trap a single three level atom in a cavity.
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 present a physical scheme to teleport an unknown atomic entangled state via cavity decay. In the teleportation process, four-particle Greenberger–Horne–Zeilinger (GHZ) state is used as quantum channel, and two unknown entangled atoms and two of four atoms in the four-particle GHZ state are trapped in four leaky cavities, respectively. Based on the joint detection of the photons leak out from the four cavities, we can teleport an unknown entangled state to two other remote atoms with certain probability and high fidelity.