Speaker
Description
The use of travelling wave parametric amplifiers (TWPAs) represents a convenient and effective readout strategy for axion haloscope experiments. TWPAs produce many GHz of broadband gain, typically covering the entire range of an experimental run, with near-quantum-limited added noise that is increasingly competitive with that of their resonant, narrowband counterparts. Beyond low-noise amplification, phase-dependent parametric amplifiers can generate squeezed vacuum noise. This has been used to enhance haloscope scan rate by permitting cavity overcoupling without the usual penalty to SNR. While squeezing has been demonstrated in single TWPAs, a full squeezed-state receiver has yet to be realised using these devices. Here, we present experimental results regarding the use of a commercially available three-wave mixing TWPA for an axion experiment, focusing on the generation of squeezed vacuum noise via its phase-dependent gain and weighing the broadband benefits against its limitations. Finally, we discuss plans to integrate such devices into a future ORGAN-Q experiment.
| Primary Abstract Topic | Experiment: Axions and Wave-Like-DM |
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