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In the past month, the group has put up two new preprints.

- In the strontium experiment, we report the generation of entangled Bell states, prepared in optical clock qubits, whose phase coherence persists for more than 4 seconds. This uses a gate scheme proposed by M. Martin and I. Deutsch, based on Rydberg-mediated interactions. See the preprint here.

- On the Ytterbium experiment, we report our first results preparing, controlling, and detecting arrays of nuclear spin qubits of 171Yb. We observe high fidelity control with sub-microsecond pulse times. We also demonstrate low-entropy array preparation through deterministic loading techniques via the use of narrow-line transitions and Raman-sideband cooling to near the motional ground state. See the preprint here.

This year’s Q2B (Quantum 2 Business) conference took place on December 7-9 at the Santa Clara Convention Center. Several big names spoke at the event, and it was a place to forge new partnerships and connections. For one lucky JILAn, the trip to this conference was sponsored by CUbit Quantum Initiative, (CUbit). "I am very grateful to Women in Quantum and CUbit for sponsoring me to attend the Q2B conference," Joanna Lis said. Lis is a graduate student within JILA Fellow Adam Kaufman's laboratory. "My research is looking at neutral atoms in tweezers. I was positively surprised on how much presence neutral atom platforms had within the conference," she added.

Our paper on high power light sources at magic wavelengths for neutral atom optical atomic clocks is published in RSI! https://aip.scitation.org/doi/10.1063/5.0057619

In this work, we showed half-minute scale coherence in a tweezer clock of 150 atoms, demonstrated high relative stability, and established new methods for scaling ultracold arrays of neutral atoms. Congratulations to the team! See also: The Nature highlight on our work and the recent entangled optical clock paper from the Vuletić group; and, NIST highlight.

A new national quantum research center draws on JILA Fellows' and their expertise to make the United States an international leader in quantum technology.

Congratulations Will!

In this most recent paper, we show how to scale tweezer arrays to 320 sites, while maintaining atomic coherence at the half-minute-scale. This allows us to reach excellent stability through frequency self-comparisons in the array, as well as to characterize the single-particle coherence in the array through correlation measurements.

The Office of Naval Research program rewards early career scientists “who show exceptional promise for doing creative research”—and JILA's Adam Kaufman's work with optical tweezers has earned that recognition.

By using optical tweezers, the Kaufman and Ye groups are exploring a new kind of optical atomic clock—one that can run measurements for more than half a minute, an unprecedented coherence time. Not only does this finding open new possibilities for precision measurement, it’s a starting point to engineer interactions between many coherent and carefully-controlled atoms.

Our paper was published in science; you can find it here. See also the news highlight by NIST: https://www.nist.gov/news-events/news/2019/09/jilas-novel-atomic-clock-design-offers-tweezer-control