Multiphoton resonances for all-optical quantum logic with multiple cavities

Mark S. Everitt and Barry M. Garraway
Phys. Rev. A 90, 012335 – Published 28 July 2014

Abstract

We develop a theory for the interaction of multilevel atoms with multimode cavities yielding cavity-enhanced multiphoton resonances. The locations of the resonances are predicted from the use of effective two- and three-level Hamiltonians. As an application we show that quantum gates can be realized when photonic qubits are encoded on the cavity modes in arrangements where ancilla atoms transit the cavity. The fidelity of operations is increased by conditional measurements on the atom and by the use of a selected, dual-rail, Hilbert space. A universal set of gates is proposed, including the Fredkin gate and iswap operation; the system seems promising for scalability.

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  • Received 26 May 2014

DOI:https://doi.org/10.1103/PhysRevA.90.012335

©2014 American Physical Society

Authors & Affiliations

Mark S. Everitt1 and Barry M. Garraway2

  • 1National Institute of Informatics, 2-1-2 Hitotsubashi, Chiyoda-ku, Tokyo 101-8430, Japan
  • 2Department of Physics and Astronomy, University of Sussex, Falmer, Brighton BN1 9QH, United Kingdom

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Issue

Vol. 90, Iss. 1 — July 2014

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