Automatic Quantum Error Correction
Quantum Physics
2009-10-31 v1
Abstract
Criteria are given by which dissipative evolution can transfer populations and coherences between quantum subspaces, without a loss of coherence. This results in a form of quantum error correction that is implemented by the joint evolution of a system and a cold bath. It requires no external intervention and, in principal, no ancilla. An example of a system that protects a qubit against spin-flip errors is proposed. It consists of three spin 1/2 magnetic particles and three modes of a resonator. The qubit is the triple quantum coherence of the spins, and the photons act as ancilla.
Cite
@article{arxiv.quant-ph/9912104,
title = {Automatic Quantum Error Correction},
author = {Jeff P Barnes and Warren S Warren},
journal= {arXiv preprint arXiv:quant-ph/9912104},
year = {2009}
}
Comments
16 pages 12 fig LaTex uses multicol, graphicx expanded version of letter submitted to Phys Rev Lett