Microwave photonics with quantum paraelectric materials*

In this project we harness the non-linear properties of quantum paraelectric materials, potassium tantalate (KTO) and strontium titanate (STO), to design parametric modulators and amplifiers. These devices will be useful for sensing and signal processing at microwave frequencies and cryogenic temperatures. At cryogenic temperatures, quantum paraelectric materials have a large dielectric constant which is tunable with an applied electric field. Crucially, they maintain this tunability at high magnetic fields. This feature is useful for both quantum information technology using spin qubits, and for axion dark matter detectors. This talk will present our preliminary results on measurement of KTO and STO dielectric response in the microwave regime, as well as simulation and fabrication of devices.

References:

[1] Vallabhapurapu et. al. Phys. Rev. Applied 16, 044051 (2021)

[2] Davidoviki et. al., Phys. Rev. B. 95, 214513 (2017)

[3] Xu et. al., PRX Quantum 4, 010322 (2023)