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

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