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X-WR-CALNAME:Stewart Blusson Quantum Matter Institute
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X-WR-CALDESC:Events for Stewart Blusson Quantum Matter Institute
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SUMMARY:CM Seminar: How nonlinearity distorts the evidence for photoinduced superconductivity\, J. Steven Dodge\, SFU
DESCRIPTION:Speaker: J. Steven Dodge\, SFU \nAbstract: How nonlinearity distorts the evidence for photoinduced superconductivity \nTime: 10:00-11:00am \nLocation: BRIM 311 \nAbstract: Over a decade of research has suggested that some metallic compounds can be transformed into superconductors by illuminating them with intense beams of laser light. Recently\, we have shown that the experimental evidence for this effect could literally be an optical illusion produced by the high-intensity laser illumination. By examining several influential results on photoinduced superconductivity in K3C60\, we have identified a fundamental flaw in their analysis that exaggerates the apparent photoinduced changes to the conductivity. When we account for this error\, we find evidence that photoexcitation produces a moderate enhancement of the conductivity\, but that there is no need to appeal to a photoinduced phase transition to a superconducting state. Subsequent work on K3C60 has provided quantitative support for our analysis. After discussing our reanalysis of experiments on K3C60\, I will describe how this error also distorts the evidence for photoinduced superconductivity in the normal state of cuprate superconductors and in the charge-transfer salt BEDT-TTF. Finally\, I will discuss how our reinterpretation raises new and interesting questions about the interaction of light with matter. \n 
URL:https://qmi.miffanytark.com/event/cm-seminar-j-steven-dodge-sfu/
CATEGORIES:CM Seminar
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DTSTART;TZID=America/Vancouver:20250123T100000
DTEND;TZID=America/Vancouver:20250123T110000
DTSTAMP:20250115T234034Z
CREATED:20250115T234034Z
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SUMMARY:CM Seminar: Just-in-time compiling Shor's algorithm with PennyLane and Catalyst\, Olivia Di Matteo\, UBC
DESCRIPTION:Speaker: Olivia Di Matteo\, UBC \nTime: 10:00-11:00am \nLocation: BRIM 311 \n\nAbstract: As quantum computing hardware continues to improve\, so must the tools we use to write quantum algorithms. There is a growing need for more expressive quantum programming languages that enable developers to write code at higher levels of abstraction than quantum circuits. This\, in turn\, necessitates robust and automated compilers that can generate optimized sequences of quantum operations in a scalable way. Such compilers are especially important for algorithms with many interdependent classical and quantum subroutines\, such as Shor’s factoring algorithm. \nIn this talk I will provide a pedagogical introduction to Shor’s algorithm by presenting its implementation at varying levels of abstraction. While its high-level subroutines are straightforward to express\, compilation and optimization incurs a large overhead due to the algorithm’s randomized nature. To that end\, I will highlight on-going work on a fully just-in-time-compiled implementation using PennyLane and Catalyst. I’ll discuss its scaling\, practical resource requirements\, implementation tricks (and unique quirks)\, and the feasibility of executing it on near-term hardware.
URL:https://qmi.miffanytark.com/event/just-in-time-compiling-shors-algorithm-with-pennylane-and-catalyst/
CATEGORIES:CM Seminar
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DTSTART;TZID=America/Vancouver:20250130T100000
DTEND;TZID=America/Vancouver:20250130T110000
DTSTAMP:20240903T220549Z
CREATED:20240903T220549Z
LAST-MODIFIED:20240903T220549Z
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SUMMARY:CM Seminar: Connected Network Model for the Mechanical Loss of Amorphous Materials\, Steven Blaber\, UBC
DESCRIPTION:Speaker: Steven Blaber\, UBC \nTime: 10:00-11:00am \nLocation: BRIM 311 \nAbstract: For over 50 years\, the two-level system (TLS) model has stood as the prevailing description of thermal and acoustic properties of amorphous solids. Atomistic modeling shows that TLS are not independent as typically assumed\, but form a sparse\, interconnected network. I will discuss the mechanical loss in amorphous solids based on the nonequilibrium thermodynamics of connected networks\, providing a major advance beyond the quintessential two-level system model\, and revealing new avenues for the study amorphous materials. Amorphous mirror coatings with exceptionally low mechanical loss are critical components in the next generation of gravitational wave detectors. I will also briefly discuss how these results could impact the TLS model for dielectric loss in superconducting qubits. \n  \nCM Seminars take place every Thursday morning at BRIM 311. More information about the talk and speaker becomes available closer to the event’s date—watch this space for more!
URL:https://qmi.miffanytark.com/event/cm-seminar-clara-santato-polytechnique-montreal/
CATEGORIES:CM Seminar
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