Phonon-number resolution of voltage-biased mechanical oscillators with weakly-anharmonic superconducting circuits
arXiv:2103.04829 · doi:10.1103/PhysRevA.104.053509
Abstract
Observing quantum phenomena in macroscopic objects, and the potential discovery of a fundamental limit in the applicability of quantum mechanics, has been a central topic of modern experimental physics. Highly coherent and heavy micro-mechanical oscillators controlled by superconducting circuits are a promising system for this task. Here, we focus in particular on the electrostatic coupling of motion to a weakly anharmonic circuit, namely the transmon qubit. In the case of a megahertz mechanical oscillator coupled to a gigahertz transmon, we explain the difficulties in bridging the large electro-mechanical frequency gap. To remedy this issue, we explore the requirements to reach phonon-number resolution in the resonant coupling of a megahertz transmon and a mechanical oscillator.
arXiv commentCode used to generate the figures available in Zenodo with the DOI identifier 10.5281/zenodo.4292367
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