Related papers: A tweezer clock with half-minute atomic coherence at optical frequencies and high relative stability

A tweezer clock with half-minute atomic coherence at optical frequencies and high relative stability

URL: http://arxiv.org/abs/2004.06095v2
Date: Tue, 23 Jun 2020 16:22:24 GMT
Title: A tweezer clock with half-minute atomic coherence at optical frequencies and high relative stability
Authors: Aaron W. Young, William J. Eckner, William R. Milner, Dhruv Kedar, Matthew A. Norcia, Eric Oelker, Nathan Schine, Jun Ye, Adam M. Kaufman
Abstract summary: We introduce a new, hybrid approach to tailoring optical potentials by tweezer-trapped alkaline-earth atoms. We achieve trapping and optical clock excited-state lifetimes exceeding $ 40 $ seconds in ensembles of approximately $ 150 $ atoms. Results pave the way towards long-lived engineered entanglement on an optical clock transition in tailored atom arrays.
Score: 0.6113111451963646
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: The preparation of large, low-entropy, highly coherent ensembles of identical quantum systems is foundational for many studies in quantum metrology, simulation, and information. Here, we realize these features by leveraging the favorable properties of tweezer-trapped alkaline-earth atoms while introducing a new, hybrid approach to tailoring optical potentials that balances scalability, high-fidelity state preparation, site-resolved readout, and preservation of atomic coherence. With this approach, we achieve trapping and optical clock excited-state lifetimes exceeding $ 40 $ seconds in ensembles of approximately $ 150 $ atoms. This leads to half-minute-scale atomic coherence on an optical clock transition, corresponding to quality factors well in excess of $10^{16}$. These coherence times and atom numbers reduce the effect of quantum projection noise to a level that is on par with leading atomic systems, yielding a relative fractional frequency stability of $5.2(3)\times10^{-17}~(\tau/s)^{-1/2}$ for synchronous clock comparisons between sub-ensembles within the tweezer array. When further combined with the microscopic control and readout available in this system, these results pave the way towards long-lived engineered entanglement on an optical clock transition in tailored atom arrays.

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