Spin echo silencing using a current-biased frequency-tunable resonator

TL;DR

This paper demonstrates a method to control microwave emission from a spin ensemble using a tunable resonator, enabling on-demand echo silencing while preserving spin coherence, which advances quantum memory protocols.

Contribution

It introduces a rapidly tunable resonator controlled by bias current to achieve on-demand echo silencing in spin ensembles, a novel approach for quantum memory control.

Findings

Echo silencing achieved by detuning during rephasing

Magnetic field gradients generated by bias current aid silencing

Spin coherence preserved during the silencing process

Abstract

The ability to control microwave emission from a spin ensemble is a requirement of several quantum memory protocols. Here, we demonstrate such ability by using a resonator whose frequency can be rapidly tuned with a bias current. We store excitations in an ensemble of rare-earth-ions and suppress on-demand the echo emission (`echo silencing') by two methods: 1) detuning the resonator during the spin rephasing, and 2) subjecting spins to magnetic field gradients generated by the bias current itself. We also show that spin coherence is preserved during silencing.