Phys. Rev. Lett. 85, 856–859 (2000)Automatic Quantum Error CorrectionReceived 19 October 1999; revised 17 March 2000; published in the issue dated 24 July 2000 Criteria are given by which dissipative evolution in the weak coupling limit can transfer populations and coherences between quantum subspaces, without a loss of coherence. The result is a form of quantum error correction implemented by the joint evolution of a system with a cold bath. It requires no external intervention and, in principle, no ancilla. An example of such a system, consisting of three dipole ordered spin 1/2 particles in a resonator, is given. The qubit, or the triple quantum coherence of the spins, is protected against all spin-flip errors. © 2000 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.85.856
DOI:
10.1103/PhysRevLett.85.856
PACS:
03.67.Lx, 05.30.Ch
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