Optimal linear optical implementation of a single-qubit damping channel

Details Optimal linear optical implementation of a single-qubit damping channel Optimal linear optical implementation of a single-qubit damping channel

2011-09-09

arxiv.org/abs/1109.2070v1

New J. Phys 14, 033016 (2012)

Physics

Quantum Physics

4 pages, 3 figures

Scientific paper

10.1088/1367-2630/14/3/033016

We experimentally demonstrate a single-qubit decohering quantum channel using linear optics. We implement the channel, whose special cases include both the amplitude-damping channel and the bit-flip channel, using a single, static optical setup. Following a recent theoretical result [M. Piani et al., Phys. Rev. A, 84, 032304 (2011)], we realize the channel in an optimal way, maximizing the probability of success, i.e., the probability for the photonic qubit to remain in its encoding. Using a two-photon entangled resource, we characterize the channel using ancilla-assisted process tomography and find average process fidelities of 0.9808 \pm 0.0002 and 0.9762 \pm 0.0002 for amplitude-damping and the bit-flip case, respectively.

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