R. G. Herb Condensed Matter Seminars

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Events During the Week of February 9th through February 16th, 2020

Monday, February 10th, 2020

No events scheduled

Tuesday, February 11th, 2020

QC Cluster Seminar
Optical photon generation from a superconducting qubit
Time: 3:00 pm
Place: 5310 Chamberlin Hall
Speaker: Alp Sipahigil, California Institute of Technology
Abstract: The ability to store, transfer, and process quantum information promises to transform how we calculate, communicate, and measure. The realization of large-scale quantum systems that can achieve these tasks is an outstanding challenge and an exciting frontier in modern physics. In the past two decades, superconducting circuits based on Josephson junctions emerged as a promising platform for processing quantum information. However, these systems operate at low temperatures and microwave frequencies, and require a coherent interface with optical photons to transfer quantum information across long distances. In this talk, I will present our recent experiments demonstrating quantum transduction of a superconducting qubit excitation to an optical photon. I will describe how we use mesoscopic mechanical oscillators in their quantum ground states to convert single photons from microwave frequencies to the optical domain. I will conclude by discussing the prospects of this approach for realizing future quantum networks based on superconducting quantum processors and mechanical quantum memories.
Host: Mark Saffman
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Wednesday, February 12th, 2020

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Thursday, February 13th, 2020

The fall and rise of the mass on a spring
Time: 10:00 am
Place: 5310 Chamberlin Hall
Speaker: Prof. Benjamin Aleman , University of Oregon
Abstract: Since antiquity, the mass on a spring and other simple mechanical systems have been used in everyday applications, like time-keeping clocks. But at one time, they were also employed in smarter information technologies such as calculators and computers, technologies now ruled by silicon-based microelectronics. In recent years, thanks largely to the nanometer-scale miniaturization of mechanical systems and the discovery of atomic-scale materials like graphene, the mass on a spring has been rising in scientific and technological prominence, and is once again knocking on the door of more sophisticated uses. The next step in this mechanical evolution—as occurred with electronic microchips—is to form large programmable networks of interacting nanomechanical resonators, but such networks demand unprecedented, scalable control over the resonance frequencies and coupling of the constituent resonators. Here, I will detail recent projects in my lab that advance the quest to realize these networks, projects enabled by optically addressable graphene nanoelectromechanical resonators. By harnessing several unique properties of graphene, we develop an optoelectronic non-volatile mechanical strain memory and a means for fast, photothermally mediated strain modulation, which together enable local static and dynamic frequency and coupling control of resonators in large arrays. I will discuss several applications already enabled by our work, such as a new light detector that "hears" light, as well as some wilder, yet promising aspirations.
Host: Brar
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Friday, February 14th, 2020

No events scheduled