Probabilistic motional averaging

Denys S. Karpov (), Vladimir Y. Monarkha, Daniel Szombati, Alejandro G. Frieiro, Aleksander N. Omelyanchouk, Evgeni Il’ichev, Arkady Fedorov and Sergey N. Shevchenko
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Denys S. Karpov: B. Verkin Institute for Low Temperature Physics and Engineering
Vladimir Y. Monarkha: ARC Centre of Excellence for Engineered Quantum Systems
Daniel Szombati: ARC Centre of Excellence for Engineered Quantum Systems
Alejandro G. Frieiro: ARC Centre of Excellence for Engineered Quantum Systems
Aleksander N. Omelyanchouk: B. Verkin Institute for Low Temperature Physics and Engineering
Evgeni Il’ichev: Leibniz Institute of Photonic Technology
Arkady Fedorov: ARC Centre of Excellence for Engineered Quantum Systems
Sergey N. Shevchenko: V. N. Karazin Kharkov National University

The European Physical Journal B: Condensed Matter and Complex Systems, 2020, vol. 93, issue 3, 1-6

Abstract: Abstract In a continuous measurement scheme a spin-1/2 particle can be measured and simultaneously driven by an external resonant signal. When the driving is weak, it does not prevent the particle wave-function from collapsing and a detector randomly outputs two responses corresponding to the states of the particle. In contrast, when driving is strong, the detector returns a single response corresponding to the mean of the two single-state responses. This situation is similar to a motional averaging, observed in nuclear magnetic resonance spectroscopy. We study such quantum system, being periodically driven and probed, which consists of a qubit coupled to a quantum resonator. It is demonstrated that the transmission through the resonator is defined by the interplay between driving strength, qubit dissipation, and resonator linewidth. We demonstrate that our experimental results are in good agreement with numerical and analytical calculations. Graphical abstract

Date: 2020
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DOI: 10.1140/epjb/e2019-100514-8

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