Other

Reception to follow talk in the h-Bar.

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Streaming in the JILA Auditorium from 2024 DAMOP Session Y02 Hot Topics

Abstract: We observed a narrow (~100 kHz) 229Th nuclear clock transition in Th-doped CaF2 crystals using a VUV frequency comb. The VUV comb directly links the 229Th nuclear transition frequency to the JILA Sr optical clock, enabling determination of the absolute 229Th clock frequency. These results represent a milestone in building solid-state nuclear clocks for precision measurements and fundamental physics.

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Abstract: Particle, nuclear, and astrophysics experiments are producing massive amounts of data to answer fundamental questions about the basic constituents of our universe.  While researchers in these areas have been using advanced data science tools for decades, modern machine learning has introduced a paradigm shift whereby data can be directly analyzed holistically without first compressing it into a more manageable and human understandable format.  How will the machines help us explore the unknown?  Can they be trusted to give us the right answers?

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We present the development and uncertainty evaluation of a transportable ytterbium optical lattice clock, achieving a total systematic uncertainty level of 3.7 ×10^-18. We also report a field test of the clock after transporting it to Washington DC, demonstrating the clock’s reliability and readiness to contribute to scientific efforts such as the redefinition of the SI second and frequency-based measurements of Earth’s geopotential.

Join us for a presentation about the recent STROBE NSF Site Review that took place in January 2024. From an institute perspective, this presentation will cover the entire timeline of the review, the types of inquiries and CU's response to the review team, and best practices and tips for working with reviewers. Discussion and question/answer will follow the presentation. All are welcome!

Abstract: Spin glasses—large-scale networks of spins with deeply frustrated interactions—are canonical examples of complex matter. Although much about their structure remains uncertain, they inform the description of a wide array of complex phenomena, ranging from magnetic ordering in metals with impurities to aspects of evolution, protein folding, climate models, and combinatorial optimization. Indeed, spin glass theory forms a mathematical basis for neuromorphic computing and brain modeling.

Please join us for a special edition of our PEAR Boulder monthly seminar series on Tuesday, April 30th at 11 am MT (1 pm ET) in conference room 1-1107 or online at https://nist.zoomgov.com/j/1601226156?pwd=aWpSMklZRWNxWGxLWXFmVVdRMEQrU….

We have two speakers from JILA (Joint Institute for Laboratory Astrophysics), Jacob S. Higgins and Kyungtae Kim, both from Prof. Jun Ye’s research group. JILA is a joint institute between NIST and the University of Colorado Boulder.

The past decade has seen a huge wave of interest in the possibility of hydrodynamic transport of electrons and/or phonons in quantum materials.  There are now dozens of experiments that are approaching consensus on a weakly viscous hydrodynamic regime in e.g. monolayer graphene.

Abstract: Circuit quantization is an extraordinarily successful theory that describes the behavior of quantum circuits with high precision.