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Optical quantum information processing utilizing weak nonlinearities: A little goes a long way

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Published copy (DOI)


  • W. J. Munro
  • K. Nemoto
  • T. P. Spiller
  • R. G. Beausoleil
  • P. Kok
  • S. D. Barrett


Publication details

JournalProceedings of SPIE - The International Society for Optical Engineering
DatePublished - 1 Dec 2005
Number of pages10
Pages (from-to)1-10
Original languageEnglish


Processing information quantum mechanically is known to enable new communication and computational scenarios that cannot be accessed with conventional information technology (IT). It is known that such quantum processing can be performed with linear optical techniques, measurement and feed-forward. However, here the gates are intrinsically probabilistic and so scaling up such an approach requires considerable qubit resources. Here we present an alternative approach to optical QIP, based on the use of weak cross-Kerr non-linearities and highly efficient homodyne measurements. This approach enables a parity gate between optical qubits, mediated by an additional optical probe mode, enabling near-deterministic Bell state measurement and entangling gates. Our approach is therefore the basis for very efficient, scalable optical QIP, and provides a natural method for distributing such processing, combining it with quantum communication.

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