Microwave Filters for Hybrid Circuit Quantum Electrodynamics

The incorporation of spin qubits into microwave cavities has enabled the read out [1] and long-range coupling of spins with microwave frequency photons [2]. One recently pursued method to increase the spin-photon coupling rate adopts high-kinetic-inductance materials [3]. However, high impedance cavities are more susceptible to microwave leakage through the quantum dot gate electrodes. In this talk, we will describe our transition to on-chip thin-film capacitors and high-kinetic-inductance nanowires to form robust and compact low-pass filters for quantum dot circuit electrodynamics.



[1] Petersson et al., Nature 490, 380 (2012)

[2] Borjans et al., Nature 577, 195 (2020)

[3] Harvey-Collard et al., Phys. Rev. Appl. 14, 034025 (2020)