Optimal linear optical implementation of a single-qubit damping channel

Author(s): K.A.G. Fischer, R. Prevedel, R. Kaltenbaek, K. J. Resch

Journal: New Journal of Physics

Volume: 14

Page(s): 033016

Year: 2012

DOI Number: 10.1088/1367-2630/14/3/033016

Link: Link to publication


We experimentally demonstrate a single-qubit decohering quantum channel using linear optics. We implement the channel, whose special cases include the familiar amplitude-damping channel and the bit-flip channel, using a single, static optical setup. Following a recent theoretical result (Piani et al 2011 Phys. Rev. A 84 032304), 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 0.98 ± 0.01 and 0.976 ± 0.009 for amplitude-damping and the bit-flip case, respectively.

Note: http://arxiv.org/abs/1109.2070

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