1301.1050 (Ali Ü. C. Hardal et al.)

Discrete time quantum walk with nitrogen-vacancy centers in diamond
coupled to a superconducting flux qubit    [PDF]

Ali Ü. C. Hardal, Peng Xue, Yutaka Shikano, Özgür E. Müstecapl\ioglu, Barry C. Sanders

We propose a quantum-electrodynamics scheme for implementing the discrete-time, coined quantum walk with the walker corresponding to the phase degree of freedom for a quasi-magnon field realized in an ensemble of nitrogen-vacancy centres in diamond. The coin is realized as a superconducting flux qubit. Our scheme improves on an existing proposal for implementing quantum walks in cavity quantum electrodynamics by removing the cumbersome requirement of varying drive-pulse durations according to mean quasiparticle number. Our improvement is relevant to all indirect-coin-flip cavity quantum-electrodynamics realizations of quantum walks. Our numerical analysis shows that this scheme can realize a discrete quantum walk under realistic conditions.

View original: http://arxiv.org/abs/1301.1050