A Dual-Band Quantum Superconducting Amplifiers for Axion-Like Dark Matter Particle Search Experiments*

The use of quantum limited components is crucial in the microwave axion-like dark matter (DM) search experiments. Most of these experiments make use of narrow-band Josephson parametric amplifier (JPA), and with the advent of the broadband travelling wave parametric amplifiers (TWPAs), it is natural to replace them with TWPAs to speed up the search and cover a broader mass range. We are currently developing a TWPA that could cover the mass range below 1GHz and above 20GHz simultaneously, cover these so-far unexplored DM mass ranges, in preparation for UHF-band Axion search DM-experiments and the near-future UK DM-search facility. Traditional ultra-low frequency TWPA is challenging to build, as the device needs to be extremely long to achieve the desirable gain. However, one could utilise the relation between the signal and the idler to promote the gain at the low frequency regime, since the idler is an image of the signal. Therefore, one can develop a dual-band TWPA where we make use of the high gain at shorter idler wavelength to transfer more energy to the lower frequency signal component. In this presentation, we shall present in details the concept and design of the dual-band TWPA, as well as some preliminary measurement results characterising the devices.