Quantum quincunx in cavity quantum electrodynamics

Barry C. Sanders, Stephen D. Bartlett, Ben Tregenna, Peter L. Knight

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    133 Citations (Scopus)
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    We introduce the quantum quincunx, which physically demonstrates the quantum walk and is analogous to Galton’s quincunx for demonstrating the random walk by employing gravity to draw pellets through pegs on a board, thereby yielding a binomial distribution of final peg locations. In contradistinction to the theoretical studies of quantum walks over orthogonal lattice states, we introduce quantum walks over nonorthogonal lattice states (specifically, coherent states on a circle) to demonstrate that the key features of a quantum walk are observable albeit for strict parameter ranges. A quantum quincunx may be realized with current cavity quantum electrodynamics capabilities, and precise control over decoherence in such experiments allows a remarkable decrease in the position noise, or spread, with increasing decoherence.
    Original languageEnglish
    Pages (from-to)042305-1-042305-4
    Number of pages4
    JournalPhysical Review A - Atomic, Molecular, and Optical Physics
    Issue number4
    Publication statusPublished - 2003

    Bibliographical note

    Copyright 2003 by The American Physical Society. Reprinted from Physical review A.


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