Strong Coupling on a Forbidden Transition in Strontium and Nondestructive Atom Counting

Abstract

We observe strong collective coupling between an optical cavity and the forbidden spin singlet to triplet optical transition ${}^1$S${}_0$ to ${}^3$P${}_1$ in an ensemble of ${}^{88}$Sr. Despite the transition being 1000 times weaker than a typical dipole transition, we observe a well resolved vacuum Rabi splitting. We use the observed vacuum Rabi splitting to make non-destructive measurements of atomic population with the equivalent of projection-noise limited sensitivity and minimal heating ($<0.01$ photon recoils/atom). This technique may be used to enhance the performance of optical lattice clocks by generating entangled states and reducing dead time.

4 pages, 4 figures

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Cited by in corpus (18)

• Quantum metrology with nonclassical states of atomic ensembles
• Exploring dynamical phase transitions with cold atoms in an optical cavity
• Seconds-scale coherence in a tweezer-array optical clock
• A Cold-Strontium Laser in the Superradiant Crossover Regime
• Magnetically-Induced Optical Transparency on a Forbidden Transition in Strontium for Cavity-Enhanced Spectroscopy
• Cavity-QED determination of the natural linewidth of the ${}^{87}$Sr millihertz clock transition with 30$\mu$Hz resolution
• Non-linear Spectroscopy of Sr Atoms in an Optical Cavity for Laser Stabilization
• A cavity-QED protocol for precise field sensing in the optical domain
• Spatially Homogeneous Entanglement for Matter-Wave Interferometry Created with Time-Averaged Measurements
• Cavity-enhanced non-destructive detection of atoms for an optical lattice clock
• Simple Laser Stabilization to the Strontium ${}^{88}$Sr Transition at 707 nm
• Cavity probe for real-time detection of atom dynamics in an optical lattice
• Toward a quantum-enhanced strontium optical lattice clock at INRIM
• Parametrized protocol achieving the Heisenberg limit in the optical domain via dispersive atom-light interactions
• Coupling atoms to cavities with narrow linewidth optical transitions: Applications to frequency metrology
• Atom-light entanglement for precise field sensing in the optical domain
• Tracking evaporative cooling of a mesoscopic atomic quantum gas in real time
• Parameter estimation with one- and two-time measurements on the emission field of the boundary time crystal