Fighting decoherence in a continuous two-qubit odd/even parity measurement with a closed loop setup

Details Fighting decoherence in a continuous two-qubit odd/even parity measurement with a closed loop setup Fighting decoherence in a continuous two-qubit odd/even parity measurement with a closed loop setup

2009-08-06

arxiv.org/abs/0908.0817v1

Phys. Rev. A 81, 012307 (2010).

Physics

Quantum Physics

9 pages, 3 figures

Scientific paper

10.1103/PhysRevA.81.012307

A parity measurement on two qubits, each consisting of a single atom in a cavity, can be realized by measuring the phase shift of a probe beam, which interacts sequentially with the two qubits, but imperfections lead to decoherence within the subspaces of a given parity. We demonstrate that a different setup, where the probe light interacts repeatedly with the qubits, can reduce the rate of decoherence within the odd or the even parity subspace significantly. We consider both the case of a resonant and the case of a nonresonant light-atom interaction and find that the performance is comparable if the parameters are chosen appropriately.

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