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American Physical Society, Physical Review A, 4(65), 2002

DOI: 10.1103/physreva.65.042304

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Universal Continuous-Variable Quantum Computation: Requirement of Optical Nonlinearity for Photon Counting

Journal article published in 2001 by Stephen D. Bartlett ORCID, Barry C. Sanders
This paper is available in a repository.
This paper is available in a repository.

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Abstract

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. ; Comment: 6 pages, no figures, replaced with published version