YQI Colloquium - Yasunobu Nakamura - The University of Tokyo

Event time: 
Friday, March 23, 2018 - 12:00pm to 1:00pm
YQI Seminar Room - 4th Floor See map
17 Hillhouse Ave
Event description: 

Hybrid quantum systems consisting of superconducting quantum circuits and surface acoustic wave resonators

Superconducting qubits and related circuits have proven to be an excellent tool for controlling and measuring their internal and external quantum degrees of freedom. Here we apply them to construct hybrid quantum systems using surface acoustic waves (SAW). Localized at the surface, SAW modes on piezoelectric substrate can provide a high-quality resonator with a small volume and strong coupling to surface electrodes. Our experiment demonstrates microwave-driven parametric coupling between SAW and microwave resonators via nonlinearity of a qubit, which enables highly efficient upconversion of SAW phonons to microwave photons and a nearly quantum-limited phonon measurement. SAW can also couple to optical light via optoelastic interaction. Our efforts toward microwave-to-optical quantum interface will also be discussed.