Quantum walks with dynamical control: graph engineering, initial state preparation and state transfer

Nitsche, T. and Elster, F. and Novotny, J. and Gábris, Aurél and Jex, I. (2016) Quantum walks with dynamical control: graph engineering, initial state preparation and state transfer. NEW JOURNAL OF PHYSICS, 18 (6). ISSN 1367-2630

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Abstract

Quantum walks are a well-established model for the study of coherent transport phenomena and provide a universal platform in quantum information theory. Dynamically influencing the walker's evolution gives a high degree of flexibility for studying various applications. Here, we present time-multiplexed finite quantum walks of variable size, the preparation of non-localised input states and their dynamical evolution. As a further application, we implement a state transfer scheme for an arbitrary input state to two different output modes. The presented experiments rely on the full dynamical control of a time-multiplexed quantum walk, which includes adjustable coin operation as well as the possibility to flexibly configure the underlying graph structures.

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