Long Distance Atomic Teleportation using Entangled Coherent States and Cavity Assisted Interaction

TL;DR

This paper introduces a novel atomic teleportation scheme using entangled coherent states and cavity interactions, achieving high fidelity and success probability with fewer resources and improved robustness over previous methods.

Contribution

The proposed scheme enables deterministic atomic teleportation with unit fidelity using entangled coherent states, avoiding complex cavity interactions and single-photon detection.

Findings

Unit success with unit fidelity for large mean photon number |α|^2.

Achieves probabilistic success with message preservation at small |α|^2.

Robust against decoherence and does not require multi-stage cavity interactions.

Abstract

The schemes proposed by S. Bose et al [Phys. Rev. Lett. 83, 5158 (1999)] and others for long distance atomic teleportation using cavity decay, gives message state dependent fidelity on successful attempt and in case of failure message state destroys. We propose a different scheme for teleportation of an atomic state from one cavity to a distant cavity by reflecting optical-pulse modes of an entangled coherent state (ECS) from single atom-cavity systems and detecting whether light is on or off. Unit success with unit fidelity is obtained for large mean photon number (|{\alpha}|^2). For small |{\alpha}|^2, however, there is some probability of failure but message state does not destroy, and this allows us to achieve unit success in a few repeated attempts. Unlike previous schemes, our scheme also enjoys advantages of deterministic generation of ECS, robustness of ECS against de-coherence due to photon absorption, and it does not require many-stage cavity interactions and single photon detection ability.