High-fidelity Z-measurement error encoding of optical qubits


Autoria(s): O'Brien, J.L.; Pryde, G.J.; White, A.G.; Ralph, T.C.
Contribuinte(s)

Crasemann, B.

Data(s)

01/01/2005

Resumo

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.

Identificador

http://espace.library.uq.edu.au/view/UQ:74827/UQ74827.pdf

http://espace.library.uq.edu.au/view/UQ:74827

Idioma(s)

eng

Publicador

American Physical Society

Palavras-Chave #Optics #Physics, Atomic, Molecular & Chemical #Linear Optics #Quantum Gate #Realization #C1 #240301 Atomic and Molecular Physics #780102 Physical sciences #02 Physical Sciences #0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
Tipo

Journal Article