# Universal continuous-variable quantum computation: Requirement of optical nonlinearity for photon counting

@article{Bartlett2001UniversalCQ, title={Universal continuous-variable quantum computation: Requirement of optical nonlinearity for photon counting}, author={Stephen D. Bartlett and Barry C. Sanders}, journal={Physical Review A}, year={2001}, volume={65}, pages={042304} }

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…

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