Superradiant Echoes Induced by Multiple Re-phasing of NV Spin Sub-ensembles Grating at Room Temperature

TL;DR

This paper demonstrates room-temperature superradiant echoes in diamond NV centers by using microwave and laser pulses to create and manipulate spin phase gratings, enabling potential quantum sensing applications.

Contribution

It introduces a method to generate and control superradiant echoes at room temperature using NV centers and microwave sequences, a novel approach in quantum optics.

Findings

Multiple superradiant echoes observed at room temperature.

Superradiant echoes can be tailored via microwave and laser parameters.

The dynamics are analogous to superradiant beats in optical clocks.

Abstract

In this Letter, we propose that superradiant echoes can be achieved at room temperature by applying a laser illumination and a microwave Hahn echo sequence to a diamond with a high concentration of nitrogen-vacancy (NV) centers placed in a dielectric microwave cavity. We identify that the combined action of two microwave driving pulses and a free evolution imprints a phase grating among NV spin sub-ensembles in frequency space, and multiple re-phasing of the grated spin sub-ensembles leads to multiple superradiant echoes through a collective coupling with the cavity. Furthermore, we show that the superradiant echoes can be actively tailored with the microwave pulses and the laser illumination by modifying the grating parameters, and the multiple re-phasing dynamics is analogous to the one leading to superradiant beats in optical clock system. In the future, the spin sub-ensembles grating and the resulting echoes can be further optimized with dynamical decoupling, which might pave the way for applications in quantum sensing.