Quantum teleportation with identical particles

TL;DR

This paper investigates quantum teleportation using identical massive particles, highlighting how particle indistinguishability and particle number conservation affect fidelity and exploring conditions for perfect teleportation.

Contribution

It analyzes the impact of particle indistinguishability and conservation laws on teleportation performance and identifies specific states that enable near-perfect teleportation.

Findings

Particle indistinguishability shifts the focus to orthogonal modes for teleportation.

Conservation of particle number reduces teleportation fidelity.

Certain entangled states, like atomic coherent states, enable high-fidelity teleportation.

Abstract

We study teleportation with identical massive particles. Indistinguishability imposes that the relevant degrees of freedom to be teleported are not particles, but rather addressable orthogonal modes. We discuss the performances of teleportation under the constraint of conservation of the total number of particles. The latter inevitably decreases the teleportation fidelity. Moreover, even though a phase reference, given by the coupling to a reservoir, circumverts the constraint, it does not restore perfect deterministic teleportation. The latter is only achievable with some special resource entangled states and when the number of particles tends to infinity. Interestingly, some of such states are the many-particle atomic coherent states and the ground state of cold atoms loaded into a double well potential, which are routinely prepared in experiments.