Linear-optics realization of channels for single-photon multimode qudits

Details Linear-optics realization of channels for single-photon multimode qudits Linear-optics realization of channels for single-photon multimode qudits

2010-12-15

arxiv.org/abs/1012.3474v1

Phys. Rev. A 84, 032304 (2011)

Physics

Quantum Physics

12 pages, 4 figures, comments welcome

Scientific paper

10.1103/PhysRevA.84.032304

We propose and theoretically study a method for the stochastic realization of arbitrary quantum channels on multimode single-photon qudits. In order for our method to be undemanding in its implementation, we restrict our analysis to linear-optical techniques, vacuum ancillary states and non-adaptive schemes, but we allow for random switching between different optical networks. With our method it is possible to deterministically implement random-unitary channels and to stochastically implement general, non-unital channels. We provide an expression for the optimal probability of success of our scheme and calculate this quantity for specific examples like the qubit amplitude-damping channel. The success probability is shown to be related to the entanglement properties of the Choi-Jamiolkowski state isomorphic to the channel.

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