Experimental preparation of two-photon Knill-Laflamme-Milburn states

Karel Lemr, Antonín Černoch, Jan Soubusta, and Jaromír Fiurášek

Phys. Rev. A 81, 012321 – Published 22 January 2010

Abstract

We report an experimental preparation of the so-called Knill-Laflamme-Milburn states (KLM states) that have been known to have interesting properties related to quantum information processing. Our experiment has demonstrated successful preparation of entangled two-photon four-mode KLM states using spontaneous parametric down-conversion as a source of entangled photon pairs, linear optical components, and avalanche photodiodes for single-photon detection. We have verified the successful generation of KLM states by complete quantum state tomography.

Received 26 October 2009

DOI:https://doi.org/10.1103/PhysRevA.81.012321

Authors & Affiliations

Karel Lemr¹, Antonín Černoch¹, Jan Soubusta¹, and Jaromír Fiurášek²

¹Joint Laboratory of Optics of Palacký University and Institute of Physics of Academy of Sciences of the Czech Republic, 17. listopadu 50A, 779 07 Olomouc, Czech Republic
²Department of Optics, Palacký University, 17. listopadu 12, 771 46 Olomouc, Czech Republic

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Vol. 81, Iss. 1 — January 2010

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Physical Review A

covering atomic, molecular, and optical physics and quantum information