Phys. Rev. Lett. 89, 207903 (2002) [4 pages]Efficient Classical Simulation of Optical Quantum Information CircuitsReceived 16 April 2002; published 29 October 2002 We identify a broad class of physical processes in an optical quantum circuit that can be efficiently simulated on a classical computer: this class includes unitary transformations, amplification, noise, and measurements. This simulatability result places powerful constraints on the capability to realize exponential quantum speedups as well as on inducing an optical nonlinear transformation via linear optics, photodetection-based measurement, and classical feedforward of measurement results, optimal cloning, and a wide range of other processes. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.89.207903
DOI:
10.1103/PhysRevLett.89.207903
PACS:
03.67.Lx, 02.20.–a, 42.50.–p
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