High-fidelity Z-measurement error encoding of optical qubits

J. L. O'Brien, G. J. Pryde, A. G. White, T. C. Ralph

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24 Citations (Scopus)
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We demonstrate a quantum error correction scheme that protects against accidental measurement, using a parity encoding where the logical state of a single qubit is encoded into two physical qubits using a nondeterministic photonic controlled-NOT gate. For the single qubit input states 0, 1, 0±1, and 0±i1 our encoder produces the appropriate two-qubit encoded state with an average fidelity of 0.88±0.03 and the single qubit decoded states have an average fidelity of 0.93±0.05 with the original state. We are able to decode the two-qubit state (up to a bit flip) by performing a measurement on one of the qubits in the logical basis; we find that the 64 one-qubit decoded states arising from 16 real and imaginary single-qubit superposition inputs have an average fidelity of 0.96±0.03.

Original languageEnglish
Article number060303
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Issue number6
Publication statusPublished - 1 Jun 2005
Externally publishedYes


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