Past Events

Abstract: To date, neutral atom optical lattice clocks have demonstrated the highest precision measurements of fractional frequency shifts. State-of-the-art optical oscillators employing cryogenic reference cavities have been used to push this frontier, enabling record-level stabilities and resulting in foundational advances in optical frequency metrology. The fundamental performance of cryogenic cavities utilizing crystalline spacers and substrates has been limited by the Brownian thermal noise associated with mechanical dissipation of the mirror coatings.

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Abstract:  Radial diffusion is a key transport process that takes place in the radiation belts. In addition to re-distributing radiation belt particles, inward radial diffusion energizes particles and outward radial diffusion can contribute to loss of particles across the magnetopause.

Abstract: One of the most remarkable discoveries in quantum physics is that long-range entangled qubits can give rise to emergent gauge fields and collective excitations exhibiting generalized ('anyonic') exchange statistics. Despite the importance of such 'topological' states for quantum information processing, they are extremely challenging to find in materials. In this talk, we explore how novel 'bottom-up' quantum devices---built atom by atom, qubit by qubit---challenge this status quo.

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Abstract: QBism (pronounced like cubism) is a foundational program for quantum mechanics premised on the idea that quantum probabilities should be understood as Bayesian probabilities—that is, quantified degrees of belief or gambling attitudes.

Abstract: Recent advances in single-molecule imaging technologies have made it possible to study gene expression dynamics at unprecedented resolution. In this talk, I will describe two projects that use this technology to visualize, quantify, and model gene expression at different levels. The first project involves the study of RNAP2 phosphorylation at a single-copy gene. Here, I combined three-color fluorescent microscopy with antibody-based probes that bind the different phosphorylated forms of endogenous RNAP2.

Abstract: Large-scale quantum computers will require error correction in order to reliably perform computations. However, the hardware overhead for error correction remains dauntingly large, with each logical qubit potentially requiring thousands of physical qubits for reliable operation. One promising approach to reducing the overheads of error correction is to tailor quantum error correcting codes to the dominant noise in the qubit hardware.

In-person and Zoom event.

Zoom Event -- Access Hybrid zoom link:
ID: 936 6429 1970

Email Sinead.Ryan@colorado.edu for the event password.

After the talk, meetup in the hBar at 4pm.  Students will have the opportunity to meet with Tanya and ask her more about her career.  Snacks and drinks will be provided.

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Abstract: Suppose one is handed the ground state wavefunction of a local Hamiltonian. How does one determine the phase of matter this ground state belongs to? In this talk, I will describe a way of answering this question for 1d symmetry protected topological phases using `RG quantum circuits': unitary circuits that test whether or not their inputs belong to a particular phase.

Abstract: The solar wind is a turbulent plasma regime that supports current sheets of many spatial scales. The vast majority of current sheets are narrower than 400 km. We associate these kinetic-scale current sheets with solar wind turbulence at 1 AU. The largest current sheet is 64,000 km wide on average, or 150 times wider than the more prevalent and turbulent ones.

Abstract: In 1974, Stephen Hawking argued that black holes destroy information, counter to a fundamental principle in quantum mechanics, calling into question how general relativity and quantum mechanics could ever be unified. Ever since then physicists have wrestled with this question.