Decoherence-free quantum memory for photonic state using atomic ensembles

TL;DR

This paper proposes a feasible decoherence-free quantum memory scheme using atomic ensembles, enabling stable quantum information storage and remote transfer with fault-tolerance, suitable for current technology.

Contribution

It introduces a new method for decoherence-free quantum memory leveraging atom-photon entanglement and atomic ensembles, with practical applications in remote quantum state transfer.

Findings

Scheme is experimentally feasible with current technology.

Provides inherent fault-tolerance to noise and imperfections.

Enables remote transfer of unknown quantum states.

Abstract

Large scale quantum information processing requires stable and long-lived quantum memories. Here, using atom-photon entanglement, we propose an experimentally feasible scheme to realize decoherence-free quantum memory with atomic ensembles, and show one of its applications, remote transfer of unknown quantum state, based on laser manipulation of atomic ensembles, photonic state operation through optical elements, and single-photon detection with moderate efficiency. The scheme, with inherent fault-tolerance to the practical noise and imperfections, allows one to retrieve the information in the memory for further quantum information processing within the reach of current technology.