Optical quantum computing with photons of arbitrarily low fidelity and purity

Peter P. Rohde
Phys. Rev. A 86, 052321 – Published 19 November 2012

Abstract

Linear optics quantum computing (LOQC) is a leading candidate for the implementation of large scale quantum computers. Here quantum information is encoded into the quantum states of light and computation proceeds via a linear optics network. It is well known that in such schemes there are stringent requirements on the spatiotemporal structure of photons—they must be completely indistinguishable and of very high purity. We show that in the boson-sampling model for LOQC these conditions may be significantly relaxed. We present evidence that by increasing the size of the system we can implement a computationally hard algorithm even if our photons have arbitrarily low fidelity and purity. These relaxed conditions may make boson-sampling LOQC within reach of present-day technology.

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  • Received 23 September 2012

DOI:https://doi.org/10.1103/PhysRevA.86.052321

©2012 American Physical Society

Authors & Affiliations

Peter P. Rohde*

  • Centre for Engineered Quantum Systems, Department of Physics and Astronomy, Macquarie University, Sydney NSW 2113, Australia

  • *dr.rohde@gmail.com; http://www.peterrohde.org

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Issue

Vol. 86, Iss. 5 — November 2012

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