Nearly Deterministic Linear Optical Controlled-NOT Gate

Kae Nemoto and W. J. Munro
Phys. Rev. Lett. 93, 250502 – Published 15 December 2004

Abstract

We show how to construct a near deterministic CNOT gate using several single photons sources, linear optics, photon number resolving quantum nondemolition detectors, and feed forward. This gate does not require the use of massively entangled states common to other implementations and is very efficient on resources with only one ancilla photon required. The key element of this gate is nondemolition detectors that use a weak cross-Kerr nonlinearity effect to conditionally generate a phase shift on a coherent probe if a photon is present in the signal mode. These potential phase shifts can then be measured using highly efficient homodyne detection.

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  • Received 18 August 2004

DOI:https://doi.org/10.1103/PhysRevLett.93.250502

©2004 American Physical Society

Authors & Affiliations

Kae Nemoto1,* and W. J. Munro1,2,†

  • 1National Institute of Informatics, 2-1-2 Hitotsubashi, Chiyoda-ku, Tokyo 101-8430, Japan
  • 2Hewlett-Packard Laboratories, Filton Road, Stoke Gifford, Bristol BS34 8QZ, United Kingdom

  • *Electronic address: nemoto@nii.ac.jp
  • Electronic address: bill.munro@hp.com

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Issue

Vol. 93, Iss. 25 — 17 December 2004

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