TY - JOUR
T1 - Universal continuous-variable quantum computation
T2 - requirement of optical nonlinearity for photon counting
AU - Bartlett, Stephen D.
AU - Sanders, Barry C.
N1 - Copyright 2002 by The American Physical Society. Reprinted from Physical review A.
PY - 2002
Y1 - 2002
N2 - 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.
AB - 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.
U2 - 10.1103/PhysRevA.65.042304
DO - 10.1103/PhysRevA.65.042304
M3 - Article
SN - 1050-2947
VL - 65
SP - 042304-1-042304-5
JO - Physical Review A - Atomic, Molecular, and Optical Physics
JF - Physical Review A - Atomic, Molecular, and Optical Physics
IS - 4
ER -