Phonon-number resolution of voltage-biased mechanical oscillators with weakly-anharmonic superconducting circuits

• URL: http://arxiv.org/abs/2103.04829v2
• Date: Wed, 24 Mar 2021 09:33:33 GMT
• Title: Phonon-number resolution of voltage-biased mechanical oscillators with weakly-anharmonic superconducting circuits
• Authors: Mario F. Gely, Gary A. Steele
• Abstract summary: We study the electrostatic coupling of motion to a weakly anharmonic circuit, namely the transmon qubit. To remedy this issue, we explore the requirements to reach phonon-number resolution.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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.

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