Abstract
We implement the proof of principle for the quantum walk of one ion in a linear ion trap. With a single-step fidelity exceeding 0.99, we perform three steps of an asymmetric walk on the line. We clearly reveal the differences to its classical counterpart if we allow the walker or ion to take all classical paths simultaneously. Quantum interferences enforce asymmetric, nonclassical distributions in the highly entangled degrees of freedom (of coin and position states). We theoretically study and experimentally observe the limitation in the number of steps of our approach that is imposed by motional squeezing. We propose an altered protocol based on methods of impulsive steps to overcome these restrictions, allowing to scale the quantum walk to many, in principal to several hundreds of steps.
- Received 24 April 2009
DOI:https://doi.org/10.1103/PhysRevLett.103.090504
©2009 American Physical Society
Synopsis
Quantum walking the line
Published 14 September 2009
A trapped ion reveals the difference between a quantum particle executing a random walk and its classical version.
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