Phys. Rev. Lett. 77, 198–201 (1996)Perfect Quantum Error Correcting CodeReceived 28 February 1996; published in the issue dated 1 July 1996 We present a quantum error correction code which protects a qubit of information against general one qubit errors. To accomplish this, we encode the original state by distributing quantum information over five qubits, the minimal number required for this task. We describe a circuit which takes the initial state with four extra qubits in the state |0〉 to the encoded state. It can also be converted into a decoder by running it backward. The original state of the encoded qubit can then be restored by a simple unitary transformation. © 1996 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.77.198
DOI:
10.1103/PhysRevLett.77.198
PACS:
89.70.+c, 02.70.-c, 03.65.-w, 89.80.+h
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