Quantum control gates with weak cross-Kerr nonlinearity

Details Quantum control gates with weak cross-Kerr nonlinearity Quantum control gates with weak cross-Kerr nonlinearity

2008-11-20

arxiv.org/abs/0811.3364v3

PHYSICAL REVIEW A 79, 022301 (2009)

Physics

Quantum Physics

12 pages, 4 figures

Scientific paper

10.1103/PhysRevA.79.022301

In this paper, with the weak cross-Kerr nonlinearity, we first present a special experimental scheme called C-path gate with which the realization of all possible bipartite POVMs of two-photon polarization states can be simpler and nearly deterministic. Following the same technique, the schemes of the realization of quantum control gates have been proposed, including the CNOT gate (1/2), Fredkin gate (1/8), Toffoli gate (2/23), CU gate and even MCU gate. All these gates are scalable with the certain probabilities which are larger than those gates in linear optics. Less resource are required and the structures of these gates are so simple that we think they are feasible with current technology and may be useful for the realization of universal computation in optics.

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