Binary Projective Measurement via Linear Optics and Photon Counting

Masahiro Takeoka, Masahide Sasaki, and Norbert Lütkenhaus

Phys. Rev. Lett. 97, 040502 – Published 26 July 2006

Abstract

We investigate the implementation of binary projective measurements with linear optics. This problem can be viewed as a single-shot discrimination of two orthogonal pure quantum states. We show that any two orthogonal states can be perfectly discriminated using only linear optics, photon counting, coherent ancillary states, and feedforward. The statement holds in the asymptotic limit of a large number of these physical resources.

Received 13 March 2006

DOI:https://doi.org/10.1103/PhysRevLett.97.040502

Authors & Affiliations

Masahiro Takeoka^1,2, Masahide Sasaki^1,2, and Norbert Lütkenhaus^3,4

¹Quantum Information Technology Group, National Institute of Information and Communications Technology (NICT), 4-2-1 Nukui-kitamachi, Koganei, Tokyo 184-8795, Japan
²CREST, Japan Science and Technology Agency, 1-9-9 Yaesu, Chuoh-ku, Tokyo 103-0028, Japan
³Quantum Information Theory Group, Institute of Theoretical Physics, Universität Erlangen-Nürnberg, 91058 Erlangen, Germany
⁴Institute for Quantum Computing, University of Waterloo, 200 University Avenue West, Waterloo, Ontario N2L 3G1, Canada

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Issue

Vol. 97, Iss. 4 — 28 July 2006

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