Quantum quincunx in cavity quantum electrodynamics

Details Quantum quincunx in cavity quantum electrodynamics Quantum quincunx in cavity quantum electrodynamics

2002-07-04

arxiv.org/abs/quant-ph/0207028v2

Phys. Rev. A 67, 042305 (2003)

Physics

Quantum Physics

4 pages, 2 figures, published version

Scientific paper

10.1103/PhysRevA.67.042305

We introduce the quantum quincunx, which physically demonstrates the quantum walk and is analogous to Galton's quincunx for demonstrating the random walk. 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.

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