Emulating weak localization using a solid-state quantum circuit

Yu Chen (), P. Roushan, D. Sank, C. Neill, Erik Lucero, Matteo Mariantoni, R. Barends, B. Chiaro, J. Kelly, A. Megrant, J. Y. Mutus, P. J. J. O'Malley, A. Vainsencher, J. Wenner, T. C. White, Yi Yin, A. N. Cleland and John M. Martinis ()
Additional contact information
Yu Chen: University of California
P. Roushan: University of California
D. Sank: University of California
C. Neill: University of California
Erik Lucero: University of California
Matteo Mariantoni: University of California
R. Barends: University of California
B. Chiaro: University of California
J. Kelly: University of California
A. Megrant: University of California
J. Y. Mutus: University of California
P. J. J. O'Malley: University of California
A. Vainsencher: University of California
J. Wenner: University of California
T. C. White: University of California
Yi Yin: University of California
A. N. Cleland: University of California
John M. Martinis: University of California

Nature Communications, 2014, vol. 5, issue 1, 1-6

Abstract: Abstract Quantum interference is one of the most fundamental physical effects found in nature. Recent advances in quantum computing now employ interference as a fundamental resource for computation and control. Quantum interference also lies at the heart of sophisticated condensed matter phenomena such as Anderson localization, phenomena that are difficult to reproduce in numerical simulations. Here, employing a multiple-element superconducting quantum circuit, with which we manipulate a single microwave photon, we demonstrate that we can emulate the basic effects of weak localization. By engineering the control sequence, we are able to reproduce the well-known negative magnetoresistance of weak localization as well as its temperature dependence. Furthermore, we can use our circuit to continuously tune the level of disorder, a parameter that is not readily accessible in mesoscopic systems. Demonstrating a high level of control, our experiment shows the potential for employing superconducting quantum circuits as emulators for complex quantum phenomena.

Date: 2014
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DOI: 10.1038/ncomms6184

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