Quantum Emulation of Coherent Backscattering in a System of Superconducting Qubits
Ana Laura Gramajo, Dan Campbell, Bharath Kannan, David K. Kim, Alexander Melville, Bethany M. Niedzielski, Jonilyn L. Yoder, María José Sánchez, Daniel Domínguez, Simon Gustavsson, William D. Oliver
DOI 10.1103/PhysRevApplied.14.014047 · Physical Review Applied
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Abstract
In condensed matter systems, coherent backscattering and quantum interference in the presence of time-reversal symmetry lead to well-known phenomena, such as weak localization (WL) and universal conductance fluctuations (UCFs). Here we use multipass Landau-Zener transitions at the avoided crossing of a highly coherent superconducting qubit to emulate these phenomena. The average and standard deviations of the qubit transition rate exhibit a dip and peak when the driving waveform is time-reversal symmetric, analogous to WL and UCFs, respectively. The higher coherence of this qubit enabled the realization of both effects, in contrast to the earlier work by Gustavsson et al. [Phys. Rev. Lett. 110, 016603 (2013)], who successfully emulated UCFs, but did not observe WL. This demonstration illustrates the use of nonadiabatic control to implement quantum emulation with superconducting qubits.
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