Speaker
Description
Superconducting microwave circuits provide a versatile platform for exploring both fundamental topological physics and the frontiers of quantum metrology. In this talk, we present two advancements based on the coherent manipulation of frequency modes in planar tunable resonators. First, we demonstrate how frequency-based synthetic dimensions can expand the dimensionality of photonic systems. By periodically modulating a single-mode resonator under a coherent monochromatic drive, we realize a tilted synthetic lattice. We study the resulting Bloch wave dynamics and their unique spectral signatures, providing experimental confirmation via a tunable superconducting resonator. Second, we exploit parametric processes to surpass the standard quantum limit in interferometry. We present a microwave device based on a single flux tunable Josephson Parametric Amplifier operating as a truncated SU(1,1) interferometer. In our implementation, the two distinct frequencies of the signal and idler photons act as the two arms of the interferometer, allowing them to travel along the same physical waveguide. By employing digital demodulation, we achieve a setup capable of reaching the Heisenberg scaling limit with minimal hardware overhead.