Probing the strongly driven spin-boson model in a superconducting quantum circuit

L. Magazzù, P. Forn-Díaz, R. Belyansky, J.-L. Orgiazzi, M. A. Yurtalan, M. R. Otto, A. Lupascu (), C. M. Wilson () and M. Grifoni ()
Additional contact information
L. Magazzù: University of Augsburg
P. Forn-Díaz: University of Waterloo
R. Belyansky: University of Waterloo
J.-L. Orgiazzi: University of Waterloo
M. A. Yurtalan: University of Waterloo
M. R. Otto: University of Waterloo
A. Lupascu: University of Waterloo
C. M. Wilson: University of Waterloo
M. Grifoni: University of Regensburg

Nature Communications, 2018, vol. 9, issue 1, 1-8

Abstract: Abstract Quantum two-level systems interacting with the surroundings are ubiquitous in nature. The interaction suppresses quantum coherence and forces the system towards a steady state. Such dissipative processes are captured by the paradigmatic spin-boson model, describing a two-state particle, the “spin”, interacting with an environment formed by harmonic oscillators. A fundamental question to date is to what extent intense coherent driving impacts a strongly dissipative system. Here we investigate experimentally and theoretically a superconducting qubit strongly coupled to an electromagnetic environment and subjected to a coherent drive. This setup realizes the driven Ohmic spin-boson model. We show that the drive reinforces environmental suppression of quantum coherence, and that a coherent-to-incoherent transition can be achieved by tuning the drive amplitude. An out-of-equilibrium detailed balance relation is demonstrated. These results advance fundamental understanding of open quantum systems and bear potential for the design of entangled light-matter states.

Date: 2018
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DOI: 10.1038/s41467-018-03626-w

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