Protected subspace Ramsey spectroscopy

Abstract

We study a modified Ramsey spectroscopy technique employing slowly decaying states for quantum metrology applications using dense ensembles. While closely positioned atoms exhibit superradiant collective decay and dipole-dipole induced frequency shifts, recent results [Ostermann, Ritsch and Genes, Phys. Rev. Lett. \textbf{111}, 123601 (2013)] suggest the possibility to suppress such detrimental effects and achieve an even better scaling of the frequency sensitivity with interrogation time than for noninteracting particles. Here we present an in-depth analysis of this 'protected subspace Ramsey technique' using improved analytical modeling and numerical simulations including larger 3D samples. Surprisingly we find that using sub-radiant states of $N$ particles to encode the atomic coherence yields a scaling of the optimal sensitivity better than $1/\sqrt{N}$. Applied to ultracold atoms in 3D optical lattices we predict a precision beyond the single atom linewidth.

9 pages, 7 figures

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Cited by in corpus (11)

• Cooperative quantum phenomena in light-matter platforms
• Many-body Signatures of Collective Decay in Atomic Chains
• Cavity antiresonance spectroscopy of dipole coupled subradiant arrays
• Selective protected state preparation of coupled dissipative quantum emitters
• Cavity Sub- and Superradiance Enhanced Ramsey Spectroscopy
• Efficient frequency-selective single-photon antennas based on a bio-inspired nano-scale atomic ring design with 9-fold symmetry
• Enhanced collective Purcell effect of coupled quantum emitter systems
• Nanoscale continuous quantum light sources based on driven dipole emitter arrays
• Super- and subradiance of clock atoms in multimode optical waveguides
• Laser noise imposed limitations of ensemble quantum metrology
• Subradiance and Superradiant Long Range Excitation Transport among Quantum Emitter Ensembles in a Waveguide