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Universal continuous-variable quantum computation: Requirement of optical nonlinearity for photon counting
2002
Physical Review A. Atomic, Molecular, and Optical Physics
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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.
doi:10.1103/physreva.65.042304
fatcat:bil6ychgurd6jfszn43mdguqwy