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X-ORIGINAL-URL:https://physics.sciences.ncsu.edu
X-WR-CALDESC:Events for Department of Physics and Astronomy
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DTSTART;TZID=America/New_York:20250106T160000
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SUMMARY:Physics Colloquium: Shengwang Du
DESCRIPTION:Title: Distributed Quantum Computing with Shared Quantum Gate Processing Unit \nAbstract: Due to many physical constraints\, it is extremely challenging to build a monolithic fully connected quantum computer with a very large number (N) of qubits\, in which a direct control gate operation can be performed between two arbitrary qubits. Extending from N to N+1 in such a quantum computer is more than just physically adding one more qubit. For this reason\, the cost of such a fully connected quantum computer increases exponentially as the number of qubits increases. On the other side\, connecting two N-qubit remote quantum computers classically\, the dimension of their combined Hilbert space is only 22N=2(N+1). If they are fully connected though quantum links\, the dimension of the combined Hilbert space could reach 2(2N) which is much more powerful than two independent quantum computers. Consequently\, there is a growing interest in exploring distributed quantum computing (DQC) systems that can interconnect many small-sized\, cost-effective local quantum computers. In most conventional DQC architectures\, each local quantum computer is equipped with additional communication qubits dedicated to establishing remote entanglement links. The presence of these communication qubits not only substantially increases the cost of individual local quantum computer nodes\, but also renders the entanglement-communication-based scheme inherently non-deterministic. In this work\, we propose a DQC architecture in which individual small-sized quantum computers are connected through a shared quantum gate processing unit (S-QGPU) [1]. The S-QGPU comprises a collection of hybrid two-qubit gate modules [2] for remote gate operations. In contrast to conventional entangled-communication-based DQC systems\, S-QGPU effectively pools the resources together for remote gate operations\, and thus significantly reduces the cost of not only the local quantum computers but also the overall distributed system. Moreover\, S-QGPU’s shared resources for remote gate operations enable efficient resource utilization. When not all computing qubits in the system require simultaneous remote gate operations\, S-QGPU-based DQC architecture demands fewer resources\, further decreasing the overall cost. Unlike conventional DQC architectures based on entanglement communication\, wherein remote gate operations are accomplished via teleportation or cat-entanglers [3\, 4]\, the proposed S-QGPU approach for remote gate operations is deterministic and does not depend on any measurement-based post selection. \n[1] E. Oh\, X. Lai\, J. Wen\, and S. Du\, “Distributed quantum computing with photons and atomic memories\,” Adv. Quantum Technol. 6\, 2300007 (2023);\n[2] S. Du\, Y. Ding\, and C. Qiao\, “S-QGPU: Shared Quantum Gate Processing Unit for distributed quantum computing\,” arXiv:2309.08736 [quant-ph].\n[3] A. Yimsiriwattana and S. J. Lomonaco Jr\, “Generalized ghz states and distributed quantum computing\,” AMS Cont. Math. 381\, 131 (2005).\n[4] J. Eisert\, K. Jacobs\, P. Papadopoulos\, and M. B. Plenio\, “Optimal local implementation of nonlocal quantum gates\,” Phys. Rev. A 62\, 052317 (2000). \nHost: Weijian Chen
URL:https://physics.sciences.ncsu.edu/event/physics-colloquium-shengwang-du/
LOCATION:Riddick 301\, 2401 Stinson Drive\, Raleigh\, NC\, 27695\, United States
CATEGORIES:Colloquia
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DTSTART;TZID=America/New_York:20250113T160000
DTEND;TZID=America/New_York:20250113T170000
DTSTAMP:20250110T153235Z
CREATED:20241206T170334Z
LAST-MODIFIED:20250110T153235Z
UID:51676-1736784000-1736787600@physics.sciences.ncsu.edu
SUMMARY:Physics Colloquium: Steve Johnston
DESCRIPTION:Title and abstract details are forthcoming. \nHost:  Alexander Kemper
URL:https://physics.sciences.ncsu.edu/event/physics-colloquium-steve-johnston/
LOCATION:Riddick 325\, 2401 Stinson Drive\, Raleigh\, NC\, 27695\, United States
CATEGORIES:Colloquia
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DTSTART;TZID=America/New_York:20250127T120000
DTEND;TZID=America/New_York:20250127T133000
DTSTAMP:20250123T154726Z
CREATED:20250123T154726Z
LAST-MODIFIED:20250123T154726Z
UID:51741-1737979200-1737984600@physics.sciences.ncsu.edu
SUMMARY:Preliminary Exam - McKenzie Myers
DESCRIPTION:Effects of Mass Loss and Overshooting on the Pre-Supernova Neutrino Signal from Red Supergiants
URL:https://physics.sciences.ncsu.edu/event/preliminary-exam-mckenzie-myers/
LOCATION:Riddick 415\, 2401 Stinson Drive\, Raleigh\, NC\, 27695\, United States
CATEGORIES:In The Department
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DTSTART;TZID=America/New_York:20250127T160000
DTEND;TZID=America/New_York:20250127T170000
DTSTAMP:20250124T151337Z
CREATED:20241206T170716Z
LAST-MODIFIED:20250124T151337Z
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SUMMARY:Physics Colloquium: Shelly Lesher
DESCRIPTION:Title: The Impact of Nuclear Physics on Society \nAbstract: Born in war\, nuclear science was first revealed to the world in horror. The Cold War\, power plant disasters\, and current political tensions continue to play into people’s fears of everything nuclear. But what is the scientist’s role? The author uses public scholarship to help address these fears by exploring the impact nuclear science has on society. When the Atomic Energy Commission (AEC) and Edward Teller planned to “nuke” a harbor in Point Hope Alaska\, the Iñupiat residents and local scientists fought to keep their land pristine. Find out what happened in Point Hope and how this impacts everything from nuclear testing to a possible cure for Alzheimer’s disease. \nHost: Richard Longland
URL:https://physics.sciences.ncsu.edu/event/physics-colloquium-shelly-lesher/
LOCATION:Riddick 325\, 2401 Stinson Drive\, Raleigh\, NC\, 27695\, United States
CATEGORIES:Colloquia
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DTSTART;TZID=America/New_York:20250130T120000
DTEND;TZID=America/New_York:20250130T130000
DTSTAMP:20250108T071201Z
CREATED:20241017T131816Z
LAST-MODIFIED:20250108T071201Z
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SUMMARY:CMB Seminar: Tom Schroeder
DESCRIPTION:Title: Controlling crystal growth using polyelectrolytes \nAbstract: In one form or another\, polyelectrolyte additives are employed to control the formation of ionic crystals in a variety of contexts. As one example\, engineers employ them as antiscalants to prevent the buildup of minerals on the interior of pipes. In a drastically different setting — the microenvironment in animal tissues in which collagen is mineralized to form bone — biological macromolecules bearing multiple phosphate groups enable the deposition of calcium salts on the interior of nanoscale fibrous scaffolds. In these processes\, associative interactions between the polyelectrolyte and nanoscale amorphous ion clusters serve as kinetic barriers to the nucleation of stable crystals. In some contexts\, these interactions drive a phase separation process that results in the formation of a mineral-rich liquid-like precursor phase. Such precursors can be manipulated with scaffolds and capillary forces to ultimately synthesize crystalline materials in highly non-equilibrium morphologies. This talk will cover some insights and applications related to liquid precursor phases (mostly of calcium carbonate) being explored in the Schroeder lab in the Department of Textile Engineering\, Chemistry and Science. Our lab is able to manipulate such precursors using other additives to controllably trigger nucleation on-demand\, activity we are able to rationalize using thermodynamic arguments. We have also developed methods to scaffold crystal deposition using readily available substrates\, enabling the synthesis of functional materials at scale. \n  \nTom Schroeder is an Assistant Professor in the Department of Textile Engineering\, Chemistry and Science in the Wilson College of Textiles. Prior to joining NC State in 2022\, he completed a postdoc in materials science in Joanna Aizenberg’s lab at Harvard\, a Ph.D. in chemical engineering from University of Michigan (in Michael Mayer’s biophysics lab\, with which he moved from Ann Arbor to the Adolphe Merkle Institute in Switzerland for nearly 3 years)\, and a bachelor’s degree in chemistry from Northwestern. Tom is broadly interested in bioinspired materials; his other specific foci include gels and ionic circuitry.
URL:https://physics.sciences.ncsu.edu/event/cmb-seminar-tom-schroeder/
LOCATION:Bureau of Mines 201
CATEGORIES:CMB Seminar
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