Automatic Quantum Error Correction

Details Automatic Quantum Error Correction Automatic Quantum Error Correction

1999-12-22

arxiv.org/abs/quant-ph/9912104v1

Physics

Quantum Physics

16 pages 12 fig LaTex uses multicol, graphicx expanded version of letter submitted to Phys Rev Lett

Scientific paper

10.1103/PhysRevLett.85.856

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.

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