Quantum entanglement and teleportation in pulsed cavity-optomechanics

TL;DR

This paper proposes a pulsed scheme to generate and verify entanglement between a mechanical oscillator and an optical pulse in cavity optomechanics, avoiding stability issues of continuous-wave methods and working with current technology.

Contribution

It introduces a pulsed entanglement protocol that does not require steady-state conditions and analyzes its feasibility under realistic experimental parameters.

Findings

Entanglement can be generated without stability constraints.

High mechanical Qf product is crucial for success.

The protocol is feasible with current optomechanical systems.

Abstract

Entangling a mechanical oscillator with an optical mode is an enticing and yet a very challenging goal in cavity optomechanics. Here we consider a pulsed scheme to create Einstein-Podolsky-Rosen-type entanglement between a traveling-wave light pulse and a mechanical oscillator. The entanglement can be verified unambiguously by a pump-probe sequence of pulses. In contrast to schemes that work in a steady-state regime under a continuous-wave drive, this protocol is not subject to stability requirements that normally limit the strength of achievable entanglement. We investigate the protocol's performance under realistic conditions, including mechanical decoherence, in full detail. We discuss the relevance of a high mechanical Qf product for entanglement creation and provide a quantitative statement on which magnitude of the Qf product is necessary for a successful realization of the scheme. We determine the optimal parameter regime for its operation and show it to work in current state-of-the-art systems.