Classical and quantum information processing with EIT

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


We review our work on electromagnetically induced transparency (EIT) as a potentially key enabling science for few-qubit Quantum Information Technology (QIT). EIT systems capable of providing two-qubit phase shifts as large as π are possible in a condensed matter system such as NV-diamond, but the potentially large residual absorption necessarily arising under this condition significantly reduces the fidelity of a nonlinear optical gate based on EIT. Instead, we emphasize that a universal set of quantum gates can be constructed using EIT systems that provide cumulative phase shifts (and residual absorptions) that are much smaller than unity. We describe a single-photon quantum nondemolition detector and a two-photon parity gate as basic elements of a non-linear optical quantum information processing system.

Original languageEnglish
Pages (from-to)143-154
Number of pages12
JournalProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - 4 Apr 2005


  • EIT
  • Nonlinear optics
  • Quantum information processing

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