Error correction in ensemble registers for quantum repeaters and quantum computers

TL;DR

This paper introduces a collective excitation blockade method for error detection and correction in ensemble quantum registers, enhancing the stability of quantum information in quantum repeaters and computers.

Contribution

It presents a novel error correction scheme using collective excitation blockade and decoherence-free encoding in ensemble quantum systems.

Findings

Effective error detection via collective excitation blockade

Simple decoherence-free encoding for ensemble qubits

Potential improvements in quantum register stability

Abstract

We propose to use a collective excitation blockade mechanism to identify errors that occur due to disturbances of single atoms in ensemble quantum registers where qubits are stored in the collective population of different internal atomic states. A simple error correction procedure and a simple decoherence-free encoding of ensemble qubits in the hyperfine states of alkali atoms are presented.