Qubit-Assisted Transduction for a Detection of Surface Acoustic Waves near the Quantum Limit

Atsushi Noguchi; Rekishu Yamazaki; Yutaka Tabuchi; Yasunobu Nakamura

doi:10.1103/PhysRevLett.119.180505

Qubit-Assisted Transduction for a Detection of Surface Acoustic Waves near the Quantum Limit

Phys Rev Lett. 2017 Nov 3;119(18):180505. doi: 10.1103/PhysRevLett.119.180505. Epub 2017 Nov 1.

Authors

Atsushi Noguchi^{1

2}, Rekishu Yamazaki^{1

2}, Yutaka Tabuchi¹, Yasunobu Nakamura^{1

3}

Affiliations

¹ Research Center for Advanced Science and Technology (RCAST), The University of Tokyo, Meguro-ku, Tokyo 153-8904, Japan.
² PRESTO, Japan Science and Technology Agency, Kawaguchi-shi, Saitama 332-0012, Japan.
³ Center for Emergent Matter Science (CEMS), RIKEN, Wako-shi, Saitama 351-0198, Japan.

PMID: 29219573
DOI: 10.1103/PhysRevLett.119.180505

Abstract

We demonstrate ultrasensitive measurement of fluctuations in a surface-acoustic-wave (SAW) resonator using a hybrid quantum system consisting of the SAW resonator, a microwave (MW) resonator, and a superconducting qubit. The nonlinearity of the driven qubit induces parametric coupling, which up-converts the excitation in the SAW resonator to that in the MW resonator. Thermal fluctuations of the SAW resonator near the quantum limit are observed in the noise spectroscopy in the MW domain.