High-fidelity Z-measurement error encoding of optical qubits
- Centre for Quantum Computer Technology, Department of Physics, University of Queensland, 4072 (Australia)
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 vertical bar 0>, vertical bar 1>, vertical bar 0>{+-} vertical bar 1>, and vertical bar 0>{+-}i vertical bar 1> 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.
- OSTI ID:
- 20717837
- Journal Information:
- Physical Review. A, Vol. 71, Issue 6; Other Information: DOI: 10.1103/PhysRevA.71.060303; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
- Country of Publication:
- United States
- Language:
- English
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