Scalable quantum information processing with atomic ensembles and flying photons

TL;DR

This paper proposes a scalable quantum information processing scheme using atomic ensembles and flying photons, leveraging Rydberg blockade for fast manipulation, suitable for quantum computation and communication.

Contribution

It introduces a novel scheme combining atomic ensembles and flying photons for scalable QIP, including cluster state generation and quantum repeaters, operable in weak coupling regimes.

Findings

Enables fast and efficient quantum gate operations with atomic ensembles.

Supports generation of two-dimensional cluster states for measurement-based quantum computing.

Works effectively in bad cavity or weak coupling regimes, relaxing experimental constraints.

Abstract

We present a scheme for scalable quantum information processing (QIP) with atomic ensembles and flying photons. Using the Rydberg blockade, we encode the qubits in the collective atomic states, which could be manipulated fast and easily due to the enhanced interaction, in comparison to the single-atom case. We demonstrate that our proposed gating could be applied to generation of two-dimensional cluster states for measurement-based quantum computation. Moreover, the atomic ensembles also function as quantum repeaters useful for long distance quantum state transfer. We show the possibility of our scheme to work in bad cavity or in weak coupling regime, which could much relax the experimental requirement. The efficient coherent operations on the ensemble qubits enable our scheme to be switchable between quantum computation and quantum communication using atomic ensembles.