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

Karel Lemr (1)

1 Institute of Physics

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 [1]. 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.

Mots clés: Physical Sciences

Karel Lemr. Preparation of Knill-Laflamme-Milburn states using a tunable controlled phase gate. Journal of Physics B: Atomic, Molecular and Optical Physics, 2011, 44 (19), pp.195501. ⟨10.1088/0953-4075/44/19/195501⟩. ⟨hal-00659905⟩