Related papers: A quantum electromechanical interface for long-lived phonons

A quantum electromechanical interface for long-lived phonons

URL: http://arxiv.org/abs/2207.10972v1
Date: Fri, 22 Jul 2022 09:38:40 GMT
Title: A quantum electromechanical interface for long-lived phonons
Authors: Alkim Bozkurt, Han Zhao, Chaitali Joshi, Henry G. LeDuc, Peter K. Day, and Mohammad Mirhosseini
Abstract summary: We present an electromechanical system capable of operating in the GHz-frequency band in a silicon-on-insulator platform. We find the cavity-mechanics system in the quantum ground state by performing sideband thermometry measurements.
Score: 6.050453270663202
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: Controlling long-lived mechanical oscillators in the quantum regime holds promises for quantum information processing. Here, we present an electromechanical system capable of operating in the GHz-frequency band in a silicon-on-insulator platform. Relying on a novel driving scheme based on an electrostatic field and high-impedance microwave cavities based on TiN superinductors, we are able to demonstrate a parametrically-enhanced electromechanical coupling of ${g/2 \pi} = 1.1$ MHz, sufficient to enter the strong-coupling regime with a cooperativity of $\mathcal{C} = 1200$. The absence of piezoelectric materials in our platform leads to long mechanical lifetimes, finding intrinsic values up to $\tau_\text{d} = 265~ \mu$s ($Q = 8.4 \times {10}^6$ at $\omega_\mathrm{m}/2\pi = 5$ GHz) measured at low-phonon numbers and millikelvin temperatures. Despite the strong parametric drives, we find the cavity-mechanics system in the quantum ground state by performing sideband thermometry measurements. Simultaneously achieving ground-state operation, long mechanical lifetimes, and strong coupling sets the stage for employing silicon electromechanical resonators as memory elements and transducers in hybrid quantum systems, and as a tool for probing the origins of acoustic loss in the quantum regime.

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