Storage and on-demand release of microwaves using superconducting resonators with tunable coupling

TL;DR

This paper introduces a superconducting resonator system with tunable coupling that enables on-demand microwave storage and release, with significant control over the storage lifetime and release timing.

Contribution

It presents a novel tunable coupling mechanism using a SQUID-controlled resonator, allowing dynamic control of microwave storage and release in superconducting circuits.

Findings

Storage lifetime can be tuned by over three orders of magnitude.

Microwave can be stored for 18 microseconds and released in 14 nanoseconds.

The system enables on-demand microwave capture, storage, and release.

Abstract

We present a system which allows to tune the coupling between a superconducting resonator and a transmission line. This storage resonator is addressed through a second, coupling resonator, which is frequency-tunable and controlled by a magnetic flux applied to a superconducting quantum interference device (SQUID). We experimentally demonstrate that the lifetime of the storage resonator can be tuned by more than three orders of magnitude. A field can be stored for 18 {\mu}s when the coupling resonator is tuned off resonance and it can be released in 14 ns when the coupling resonator is tuned on resonance. The device allows capture, storage, and on-demand release of microwaves at a tunable rate.