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Towards Scalable Linear-Optical Quantum Computers

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Abstract

Scalable quantum computation with linear optics was considered to be impossible due to the lack of efficient two-qubit logic gates, despite the ease of implementation of one-qubit gates. Two-qubit gates necessarily need a non-linear interaction between the two photons, and the efficiency of this non-linear interaction is typically very small in bulk materials. However, it has recently been shown that this barrier can be circumvented with effective non-linearities produced by projective measurements, and with this work linear-optical quantum computing becomes a new avenue towards scalable quantum computation. We review several issues concerning the principles and requirements of this scheme.

PACS: 03.67.Lx, 03.67.Pp, 42.50.Dv, 42.65.Lm

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Authors and Affiliations

  1. Quantum Computing Technologies Group, Section 367, Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, MS, CA, 91109, USA

    J. P. Dowling & H. Lee

  2. Department of Physics, Louisiana State University, Baton Rouge, LA, 70803, USA

    J. P. Dowling

  3. Applied Physics Laboratory, Johns Hopkins University, Laurel, MD, 20723, USA

    J. D. Franson

  4. Centre for Quantum Computer Technology, University of Queensland, QLD, 4072, Australia

    G. J. Milburn

Authors
  1. J. P. Dowling
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  2. J. D. Franson
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  3. H. Lee
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  4. G. J. Milburn
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Dowling, J.P., Franson, J.D., Lee, H. et al. Towards Scalable Linear-Optical Quantum Computers. Quantum Information Processing 3, 205–213 (2004). https://doi.org/10.1007/s11128-004-9419-1

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  • DOI: https://doi.org/10.1007/s11128-004-9419-1

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