Quantum-enabled communication without a phase reference

TL;DR

This paper demonstrates that quantum communication without a phase reference is feasible using short-time memory effects, with derived capacities showing advantages of non-Gaussian states and simple encoding schemes under certain noise conditions.

Contribution

It provides the first exact solutions for quantum capacities without phase references and highlights the benefits of non-Gaussian states and simple encoding in noisy environments.

Findings

Quantum communication without phase reference is possible with short-time memory effects.

Non-Gaussian multipartite-entangled states outperform Gaussian sources in this setting.

Simple phase-encoding schemes can achieve capacity bounds under high noise.

Abstract

A phase reference has been a standard requirement in continuous-variable quantum sensing and communication protocols. However, maintaining a phase reference is challenging due to environmental fluctuations, preventing quantum phenomena such as entanglement and coherence from being utilized in many scenarios. We show that quantum communication and entanglement-assisted communication without a phase reference are possible, when a short-time memory effect is present. The degradation in the communication rate of classical or quantum information transmission decreases inversely with the correlation time. An exact solution of the quantum capacity and entanglement-assisted classical/quantum capacity for pure dephasing channels is derived, where non-Gaussian multipartite-entangled states show strict advantages over usual Gaussian sources. For thermal-loss dephasing channels, lower bounds of the capacities are derived. The lower bounds also extend to scenarios with fading effect in the channel. In addition, for entanglement-assisted communication, the lower bounds can be achieved by a simple phase-encoding scheme on two-mode squeezed vacuum sources, when the noise is large.