High-Fidelity Z-Measurement Error Correction of Optical Qubits

Details High-Fidelity Z-Measurement Error Correction of Optical Qubits High-Fidelity Z-Measurement Error Correction of Optical Qubits

2004-08-10

arxiv.org/abs/quant-ph/0408064v1

Phys.Rev.A71:060303,2005

Physics

Quantum Physics

4 pages, 4 figures, comments welcome

Scientific paper

10.1103/PhysRevA.71.060303

We demonstrate a quantum error correction scheme that protects against accidental measurement, using an encoding where the logical state of a single qubit is encoded into two physical qubits using a non-deterministic photonic CNOT gate. For the single qubit input states |0>, |1>, |0>+|1>, |0>-|1>, |0>+i|1>, and |0>-i|1> our encoder produces the appropriate 2-qubit encoded state with an average fidelity of 0.88(3) and the single qubit decoded states have an average fidelity of 0.93(5) with the original state. We are able to decode the 2-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 1-qubit decoded states arising from 16 real and imaginary single qubit superposition inputs have an average fidelity of 0.96(3).

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