Entanglement is better teleported than transmitted

TL;DR

This paper demonstrates that entanglement can be more effectively established between distant parties via quantum teleportation using field-generated entanglement, outperforming direct transmission methods in quantum communication.

Contribution

It introduces a teleportation protocol leveraging field-generated entanglement, enabling negativity transfer at lower perturbative orders than direct coupling methods.

Findings

Teleportation transfers negativity at second order perturbation.

Direct coupling generates negativity only at higher orders.

Field harvesting can produce usable entanglement for teleportation.

Abstract

We show that, for the purpose of quantum communication via a quantum field, it is essential to view the field not only as a medium for transmission but also as a source of entanglement that can aid in the communication task. To this end, we consider the quantum communication scenario where Alice is initially entangled with an ancilla and intends to communicate with Bob through a quantum field, so as to make Bob entangled with the ancilla. We find that if Alice and Bob communicate by directly coupling to the quantum field, then they can generate negativity between Bob and the ancilla only at orders that are higher than second perturbative order. We then present a protocol based on quantum teleportation in which Alice and Bob consume entanglement that they obtained from the field via interaction or harvesting. We show that this protocol can transfer negativity already to second perturbative order.