First measurements with three-Josephson Junction Radiofrequency Quantum Upconverters
ORAL
Abstract
The Radiofrequency Quantum Upconverter (RQU) coherently upconverts low-frequency (<300 MHz) signals to microwave frequencies, enabling precision measurement for fundamental physics experiments including measurements that evade the Standard Quantum Limit. The RQU consists of a microwave resonator terminated by a multi-junction Josephson junction interferometer. The microwave resonance frequency is modulated via a parametric coupling between the interferometer and a low-frequency pickup resonator. In this talk, we present first experimental results from Al-AlO-Al three-junction RQUs. We discuss the structure and fabrication of these RQUs. We demonstrate low-frequency upconversion from dc to ~20 MHz and frequency modulation of the microwave resonator with varying applied flux. In addition, we present phase-sensitive amplification results from our RQU, a necessary precursor to implementing quantum back action evasion.
*This work was supported by the US Department of Energy, Office of High Energy Physics program under the QuantISED program, FWP 100495. Jason Corbin is supported by the High Energy Physics Consortium for Advanced Training (HEPCAT), which is funded by the DOE, Office of HEP (award number: DE-SC0022313). We would also like to acknowledge the Stanford Nanofabrication Facility and Safavi-Naeini group for providing fabrication facilities.
–
Presenters
-
Jason Y Corbin
- Stanford University