Automatic Quantum Error Correction
arXiv:quant-ph/9912104 · doi:10.1103/PhysRevLett.85.856
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.
16 pages 12 fig LaTex uses multicol, graphicx expanded version of letter submitted to Phys Rev Lett
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