Hybrid Analog Teleportation-Direct Transmission in Noisy Bosonic Channels

TL;DR

This paper proposes a hybrid quantum state transfer protocol that replaces classical communication with analog feedforward, outperforming traditional teleportation in certain noisy bosonic channels, with practical implications for optical and microwave systems.

Contribution

Introduces a hybrid teleportation-direct transmission protocol utilizing analog feedforward, offering advantages over standard quantum teleportation in noisy bosonic channels.

Findings

Hybrid protocol outperforms standard teleportation in certain noisy channels.

Optimality of the hybrid protocol depends on entanglement reduction by the channel.

Applicable to optical and superconducting microwave communication systems.

Abstract

Quantum teleportation uses a shared entangled resource, local operations, and a digitally error-corrected classical channel to transfer quantum states between distant parties. We introduce a hybrid teleportation-direct transmission protocol for state transfer that still exploits entanglement, but replaces classical communication and digital error correction with an analog feedforward through a noisy quantum channel. We show that quantum teleportation outperforms this protocol if the communication channel reduces the entanglement of all bipartite states having the same amount of entanglement as the resource; otherwise, the hybrid protocol is optimal. We apply our result to the state transfer of a uniformly distributed coherent-states codebook, highlighting experimentally relevant scenarios where our protocol is most effective. Our findings are directly relevant to both optical and superconducting microwave channels, where analog feedforward techniques have been recently implemented.