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

Understand

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.