Upcoming Events

Spring 2024 CUbit Quantum Seminar Series

NOTE: For the Spring 2024 Semester, all talks will be on Tuesday afternoons instead of Monday afternoons.

All seminars are held in the CASE Auditorium. Light refreshments will be served starting at 3:30 p.m. Talk begins at 4 p.m.
This seminar series is sponsored by CUbit with generous support of the Caruso Foundation.

  • Who: Michael Foss-Feig
  • Title: The computational power of random quantum circuits in arbitrary geometries
  • Abstract: Empirical evidence for a gap between the computational powers of classical and quantum computers has been provided by experiments that sample the output distributions of two-dimensional quantum circuits. Many attempts to close this gap have utilized classical simulations based on tensor network techniques, and their limitations shed light on the improvements to quantum hardware required to frustrate classical simulability. In particular, quantum computers having in excess of ∼50 qubits are primarily vulnerable to classical simulation due to restrictions on their gate fidelity and their connectivity, the latter determining how many gates are required (and therefore how much infidelity is suffered) in generating highly-entangled states. Here, we describe recent hardware upgrades to Quantinuum's H2 quantum computer enabling it to operate on up to 56 qubits with arbitrary connectivity and 99.843(5)% two-qubit gate fidelity. Utilizing the flexible connectivity of H2, we present data from random circuit sampling in highly connected geometries, doing so at unprecedented fidelities and a scale that appears to be beyond the capabilities of state-of-the-art classical algorithms. The considerable difficulty of classically simulating H2 is likely limited only by qubit number, demonstrating the promise and scalability of the QCCD architecture as continued progress is made towards building larger machines.

Live Youtube Link Live only, no recording.

Past Events

​CUbit Quantum Seminar Series (Archive)

Funded with the generous support of The Caruso Foundation.

Spring 2024 Seminars 

  • Dr.Amir Safavi-Naeni, Associate Professor of Applied Physics and, by courtesy, of Electrical Engineering, Stanford April 16, 2024
  • Antoine Browaeys (Group Leader, Quantum Optics – Atoms, Laboratoire Charles Fabry at Institut d’Optique) February 27, 2024
  • Dr. Jeff Thompson, Associate Professor of Electrical and Computer Engineering, Princeton April 30, 2024

Fall 2023 Seminars 

  • Leticia Tarruell (Ultracold Quantum Gases, ICFO, Barcelona Institute of Science and Technology) December 11, 2023
  • John Preskill (Caltech) November 13, 2023
  • Christopher Monroe (Duke) October 23, 2023

Spring 2023 Seminars 

  • Mikhail Lukin (Harvard) May 1, 2023  Watch Talk
  • Jon Simon (Stanford) April 10, 2023  Watch Talk
  • Amir Safavi-Naeini (Stanford) March 13, 2023 CANCELED due to illness.
  • Sabrina Maniscalco (University of Helsinki) February 6, 2023 Watch Talk
  • Nathalie de Leon (Princeton University) January 30, 2023 Watch Talk

Fall 2022 Seminars

  • John Martinis (UC Santa Barbara) December 12, 2022
  • Ana Garcia (Columbia University) December 5, 2022
  • Ferdinand Kuemmeth (Niels Bohr Institute) November 7, 2022
  • Kartik A. Srinivasan (NIST) October 24, 2022
  • Mark Eriksson (University of Wisconsin-Madison) October 17, 2022  Watch Talk
    Quantum Computing Using Electron Spins in Silicon
  • Eugene Simon Polzik (Niels Bohr Institute) September 26, 2022  Watch Talk
    Quantum Physics with Macroscopic Objects
  • Rahul Nandkishore (CU Boulder) August 29, 2022  Watch Talk
    Fracton Dynamics

Spring 2022 Seminars

  • Hong Tang (Yale) April 25, 2022  Watch Talk
    Integrated Nonlinear Photonics for Quantum Frequency Conversion
  • Marko Loncar (Harvard) April 18, 2022  Watch Talk
    New Opportunities with Old Materials
  • John Doyle (Harvard) March 28, 2022
    Cold and Ultra-Cold Molecules for Quantum Science 
  • Krister Shalm (NIST) February 14, 2022
    Quantum Entropy as a Service  Watch Talk

Fall 2021 Seminars

  • Jelena Vuckovic (Stanford) December 6, 2021
    Scalable Semiconductor Quantum Systems  Watch Talk

  • Ben Bloom (Atom Computing) November 8, 2021
    Optically Trapped Atomic Qubits  Watch Talk

  • Will Oliver (MIT) October 11, 2021
    Giant Artifical Atoms and Waveguide QED  Watch Talk

  • Scott Diddams (NIST) September 13, 2021
    Optical Frequency Combs 2.0  Watch Talk

  • Ania Jayich (UCSB) February 26, 2019
  • Andrei Faraon (Caltech) March 12, 2019
  • Markus Greiner (Harvard) March 19, 2019
  • Vladan Vuletic (MIT) April 2, 2019
  • Kai-Mei Fu (UW Seattle) April 30, 2019
  • Jack Harris (Yale) May 14, 2019
  • Jonathan Home (ETH) May 14, 2019
  • Nergis Mavalvala (MIT) September 30, 2019
  • Dan Oron (Weizmann) October 28, 2019
  • Franco Wong (MIT) November 4, 2019
  • David Schuster (Chicago) November 18, 2019
  • Andrew Wilson (NIST) December 2, 2019
  • John Martinis (UCSB, Google) February 10, 2020
  • Alexander Gaeta (Columbia) Scheduled February 24, 2020
  • Aram Harrow (MIT) Scheduled March 9, 2020, postponed
  • Jelena Vuckovic (Stanford) Scheduled April 13, 2020, postponed
  • John Doyle (Harvard) Scheduled April 20, 2020, postponed

Other Past Events