Demonstration of an Optical Quantum Controlled-NOT Gate without Path Interference

Ryo Okamoto, Holger F. Hofmann, Shigeki Takeuchi, and Keiji Sasaki
Phys. Rev. Lett. 95, 210506 – Published 18 November 2005

Abstract

We report the first experimental demonstration of an optical quantum controlled-NOT gate without any path interference, where the two interacting path interferometers of the original proposals [Phys. Rev. A 66, 024308 (2002); 65, 062324 (2002)] have been replaced by three partially polarizing beam splitters with suitable polarization dependent transmittances and reflectances. The performance of the device is evaluated using a recently proposed method [Phys. Rev. Lett. 94, 160504 (2005)], by which the quantum process fidelity and the entanglement capability can be estimated from the 32 measurement results of two classical truth tables, significantly less than the 256 measurement results required for full quantum tomography.

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  • Received 30 June 2005

DOI:https://doi.org/10.1103/PhysRevLett.95.210506

©2005 American Physical Society

Authors & Affiliations

Ryo Okamoto1, Holger F. Hofmann2, Shigeki Takeuchi1, and Keiji Sasaki1

  • 1Research Institute for Electronic Science, Hokkaido University, Sapporo 060-0812, Japan
  • 2Graduate School of Advanced Sciences of Matter, Hiroshima University, Hiroshima 739-8530, Japan

See Also

Demonstration of a Simple Entangling Optical Gate and Its Use in Bell-State Analysis

N. K. Langford, T. J. Weinhold, R. Prevedel, K. J. Resch, A. Gilchrist, J. L. O’Brien, G. J. Pryde, and A. G. White
Phys. Rev. Lett. 95, 210504 (2005)

Linear Optics Controlled-Phase Gate Made Simple

Nikolai Kiesel, Christian Schmid, Ulrich Weber, Rupert Ursin, and Harald Weinfurter
Phys. Rev. Lett. 95, 210505 (2005)

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Vol. 95, Iss. 21 — 18 November 2005

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