Universal continuous-variable quantum computation

requirement of optical nonlinearity for photon counting

Stephen D. Bartlett, Barry C. Sanders

Research output: Contribution to journalArticle

101 Citations (Scopus)
77 Downloads (Pure)


Although universal continuous-variable quantum computation cannot be achieved via linear optics (including squeezing), homodyne detection, and feed-forward, inclusion of ideal photon-counting measurements overcomes this obstacle. These measurements are sometimes described by arrays of beam splitters to distribute the photons across several modes. We show that such a scheme cannot be used to implement ideal photon counting and that such measurements necessarily involve nonlinear evolution. However, this requirement of nonlinearity can be moved “off-line,” thereby permitting universal continuous-variable quantum computation with linear optics.
Original languageEnglish
Pages (from-to)042304-1-042304-5
Number of pages5
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Issue number4
Publication statusPublished - 2002

Bibliographical note

Copyright 2002 by The American Physical Society. Reprinted from Physical review A.

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