Toward nanomechanical quantum sensors

• Speaker: Dr. Junho Suh (KRISS)
• Date: Friday September 28, 2018 5:00pm
• Place: 한국표준과학연구원 물리동(201동) 2층 204호 세미나실

Nanomechanical sensors for mass, charge, spin and other various physical measurements have been demonstrated based on sensitive detection of their mechanical resonances. By cooling down the nanomechanical resonators, one could reach quantum regime where actuations and detections near zero-point motion become possible. For example, quantum back-action evading measurements[1] and quantum squeezing of mechanical motion[2-3] have been conducted in the experiments with cavity electromechanical systems. Toward quantum sensors based on the cavity electromechanical devices, improved photon-phonon coupling is necessary. In this talk, I describe our recent approaches involving tunable Josephson inductance and type-II superconductor microwave resonators that could bring the nanomechanical resonators into the ultra-strong coupling regime with microwave photons[4].

[1] Suh et.al., Science 344, 1262-1265 (2014). [2] Wollman et.al., Science 349, 952-955 (2015). [3] Lei et.al., PRL 117, 100801 (2016). [4] Nation et.al., PRA 93, 022510 (2016).