Coherent Population Trapping with a controlled dissipation: applications in optical metrology

TL;DR

This paper investigates a pulsed Coherent Population Trapping protocol with controlled decay, demonstrating its potential for high-precision optical measurements and faster implementation compared to traditional methods.

Contribution

It introduces a novel pulsed CPT scheme with controlled dissipation, showing its effectiveness for optical metrology and faster operation times.

Findings

Spectral lines suitable for frequency measurement identified.

Protocol achieves performance comparable to Ramsey-CPT.

Implementation feasible with alkali atoms and ions.

Abstract

We analyze the properties of a pulsed Coherent Population Trapping protocol that uses a controlled decay from the excited state in a $\Lambda$-level scheme. We study this problem analytically and numerically and find regimes where narrow transmission, absorption, or fluorescence spectral lines occur. We then look for optimal frequency measurements using these spectral features by computing the Allan deviation in the presence of ground state decoherence and show that the protocol is on a par with Ramsey-CPT. We discuss possible implementations with ensembles of alkali atoms and single ions and demonstrate that typical pulsed-CPT experiments that are realized on femto-second time-scales can be implemented on micro-seconds time-scales using this scheme.