Preparation of Knill-Laflamme-Milburn states using tunable controlled phase gate

Details Preparation of Knill-Laflamme-Milburn states using tunable controlled phase gate Preparation of Knill-Laflamme-Milburn states using tunable controlled phase gate

2011-08-04

arxiv.org/abs/1108.1006v1

J. Phys. B: At. Mol. Opt. Phys. 44 (2011) 195501

Physics

Quantum Physics

5 pages, 4 figures, accepted in Journal of Physics B

Scientific paper

10.1088/0953-4075/44/19/195501

A specific class of partially entangled states known as Knill-Laflamme-Milburn states (or KLM states) has been proved to be useful in relation to quantum information processing [Knill et al., Nature 409, 46 (2001)]. Although the usage of such states is widely investigated, considerably less effort has been invested into experimentally accessible preparation schemes. This paper discusses the possibility to employ a tunable controlled phase gate to generate an arbitrary Knill-Laflamme-Milburn state. In the first part, the idea of using the controlled phase gate is explained on the case of two-qubit KLM states. Optimization of the proposed scheme is then discussed for the framework of linear optics. Subsequent generalization of the scheme to arbitrary n-qubit KLM state is derived in the second part of this paper.

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