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arXiv · 1403.4632

Experimental bath engineering for quantitative studies of quantum control

A. Soare·H. Ball·D. Hayes·X. Zhen·M. C. Jarratt·J. Sastrawan·H. Uys·M. J. Biercuk
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Abstract

We develop and demonstrate a technique to engineer universal unitary baths in quantum systems. Using the correspondence between unitary decoherence due to ambient environmental noise and errors in a control system for quantum bits, we show how a wide variety of relevant classical error models may be realized through In-Phase/Quadrature modulation on a vector signal generator producing a resonant carrier signal. We demonstrate our approach through high-bandwidth modulation of the 12.6 GHz carrier appropriate for trapped $^{171}$Yb$^{+}$ ions. Experiments demonstrate the reduction of coherent lifetime in the system in the presence of an engineered bath, with the observed $T_{2}$ scaling as predicted by a quantitative model described herein. These techniques form the basis of a toolkit for quantitative tests of quantum control protocols, helping experimentalists characterize the performance of their quantum coherent systems.

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A. Soare, H. Ball, D. Hayes, X. Zhen, M. C. Jarratt, J. Sastrawan, H. Uys, M. J. Biercuk. 2014-04-08. Experimental bath engineering for quantitative studies of quantum control. https://doi.org/10.1103/physreva.89.042329

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