Coherent excitation of a $\mu$Hz scale optical magnetic quadrupole transition

• URL: http://arxiv.org/abs/2401.03934v1
• Date: Mon, 8 Jan 2024 14:46:44 GMT
• Title: Coherent excitation of a $\mu$Hz scale optical magnetic quadrupole transition
• Authors: V. Kl\"usener, S. Pucher, D. Yankelev, J. Trautmann, F. Spriestersbach, D. Filin, S. G. Porsev, M. S. Safronova, I. Bloch, S. Blatt
• Abstract summary: By confining atoms in a state insensitive optical lattice, we achieve excitation fractions of 97(1)%. We find coherence times of 14(1) ms, which can be extended to 266(36) ms using a spin-echo sequence. These results establish an additional clock transition in strontium and pave the way for applications of the metastable $3mathrmP$ state in quantum computing.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We report on the coherent excitation of the ultranarrow $^{1}\mathrm{S}_0$-$^{3}\mathrm{P}_2$ magnetic quadrupole transition in $^{88}\mathrm{Sr}$. By confining atoms in a state insensitive optical lattice, we achieve excitation fractions of 97(1)% and observe linewidths as narrow as 58(1) Hz. With Ramsey spectroscopy, we find coherence times of 14(1) ms, which can be extended to 266(36) ms using a spin-echo sequence. We determine the linewidth of the M2 transition to 24(7) $\mu$Hz, confirming longstanding theoretical predictions. These results establish an additional clock transition in strontium and pave the way for applications of the metastable $^{3}\mathrm{P}_2$ state in quantum computing and quantum simulations.

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