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Processing multiphoton states through operation on a single photon: Methods and applications

Source: Phys. Rev. A 80, 042311 (2009); doi:10.1103/PhysRevA.80.042311

Published 15 October 2009

KEYWORDS and PACS
Keywords
PACS
  • 03.67.Lx
    Quantum computation architectures and implementations
  • 42.50.Ex
    Optical implementations of quantum information processing and transfer
  • YEAR: 2009
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PUBLICATION DATA
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Qing Lin,1 Bing He,2 János A. Bergou,3 and Yuhang Ren3
1College of Information Science and Engineering, Huaqiao University (Xiamen), Xiamen 361021, China
2Institute for Quantum Information Science, University of Calgary, Alberta, Canada T2N 1N4
3Department of Physics and Astronomy, Hunter College of the City University of New York, 695 Park Avenue, New York, New York 10065, USA
Multiphoton states are widely applied in quantum information technology. By the methods presented in this paper, the structure of a multiphoton state in the form of multiple single-photon qubit products can be mapped to a single-photon qudit, which could also be in a separable product with other photons. This makes possible the manipulation of such multiphoton states by processing single-photon states. The optical realization of unknown qubit discrimination [B. He, J. A. Bergou, and Y.-H. Ren, Phys. Rev. A 76, 032301 (2007)] is simplified with the transformation methods. Another application is the construction of quantum logic gates, where the inverse transformations back to the input state spaces are also necessary. We especially show that the modified setups to implement the transformations can realize the deterministic multicontrol gates (including Toffoli gate) operating directly on the products of single-photon qubits. ©2009 The American Physical Society
History: Received 27 July 2009; published 15 October 2009
Permalink: http://link.aps.org/abstract/PRA/v80/e042311

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