Linear Optics Controlled-Phase Gate Made Simple

Nikolai Kiesel, Christian Schmid, Ulrich Weber, Rupert Ursin, and Harald Weinfurter
Phys. Rev. Lett. 95, 210505 – Published 18 November 2005

Abstract

Linear optics quantum logic gates are the best tool to generate multiphoton entanglement. Simplifying a recent approach [Phys. Rev. A 65, 062324 (2002); 66, 024308 (2002); Nature (London) 426, 264 (2003); Phys. Rev. Lett. 93, 080502 (2004)], we were able to implement the conditional phase gate with only one second-order interference at a polarization dependent beam splitter, thereby significantly increasing its stability. The improved quality of the gate is evaluated by analyzing its entangling capability and by performing full process tomography. The achieved results ensure that this device is well suited for implementation in various multiphoton quantum information protocols.

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  • Received 30 June 2005

DOI:https://doi.org/10.1103/PhysRevLett.95.210505

©2005 American Physical Society

Authors & Affiliations

Nikolai Kiesel1,2, Christian Schmid1,2, Ulrich Weber1,2, Rupert Ursin3, and Harald Weinfurter1,2

  • 1Max-Planck-Institut für Quantenoptik, D-85748 Garching, Germany
  • 2Department für Physik, Ludwig-Maximilians-Universität, D-80797 München, Germany
  • 3Institut für Experimentalphysik, Universität Wien, A-1090 Wien, Austria

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)

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 (2005)

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Vol. 95, Iss. 21 — 18 November 2005

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