Kavli Affiliate: Kent D. Irwin
| First 5 Authors: Stephen E. Kuenstner, Elizabeth C. van Assendelft, Saptarshi Chaudhuri, Hsiao-Mei Cho, Jason Corbin
| Summary:
We describe the RF Quantum Upconverter (RQU) and describe its application to
quantum metrology of electromagnetic modes between dc and the Very High
Frequency band (VHF) ($lesssim$300MHz). The RQU uses a Josephson
interferometer made up of superconducting loops and Josephson junctions to
implement a parametric interaction between a low-frequency electromagnetic mode
(between dc and VHF) and a mode in the microwave C Band ($sim$ 5GHz),
analogous to the radiation pressure interaction between electromagnetic and
mechanical modes in cavity optomechanics. The RQU can operate as a
quantum-limited op-amp, or use protocols from optomechanics to implement
non-classical measurement protocols equivalent to those used in cavity
optomechanics, including back-action evading (BAE) measurements, sideband
cooling, and two-mode squeezing. These protocols enable experiments using
dc-VHF electromagnetic modes as quantum sensors.
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