Past Seminars

May 2023
May 24 2023
1:30 pm - 2:30 pm

Quantum Error Correction Sold Out

Victor Albert, NIST and University of Maryland. Online participation available.
C520 Physics and Astronomy Building
May 16 2023
1:30 pm - 2:30 pm


Shallow neutral donors (D0) in ZnO have emerged as a promising candidate for solid-state spin qubits. Here, we report on the formation of D0 in ZnO via implantation of In and subsequent annealing. The implanted In donors exhibit optical and spin properties on par with in situ doped donors. The inhomogeneous linewidth of the donor-bound exciton transition is less than 10 GHz, comparable to the optical linewidth of in situ In. Longitudinal spin relaxation times (T1) exceed reported values for in situ Ga donors, indicating that residual In implantation damage does not degrade T1. Two laser Raman spectroscopy on the donor spin reveals the hyperfine interaction of the donor electron with the spin-9/2 In nuclei. This work is an important step toward the deterministic formation of In donor qubits in ZnO with optical access to a long-lived nuclear spin memory.
C421 Physics and Astronomy Building
May 02 2023
1:30 pm - 2:30 pm

UW-PHYSICS-QIS: Stephen Jordan

 I will discuss quantum algorithms for simulating classical wave propagation that achieve superquadratic speedup in the case of three dimensions. These algorithms are based on reductions to Hamiltonian simulation and can be generalized to simulate Maxwell's equations and the Klein-Gordon equation. I will discuss the quantum algorithms, some concrete estimates on the number of qubits and gates needed for solving problems in the regime that might be challenging for classical supercomputers, and some complexity-theoretic barriers against certain generalizations.
C421 Physics and Astronomy Building
April 2023
Apr 25 2023
1:30 pm - 2:30 pm

UW-PHYSICS-QIS: Matthew Hastings

Future quantum computers will require some form of error correction to deal with imperfect hardware.  Traditional quantum error correcting codes are based on the so-called “stabilizer” formalism, and many commonly used codes correspond to physical theories such as discrete gauge theories.  I’ll talk about a new kind of code, called a Floquet code, that offers potentially improved performance for certain kinds of hardware and that has an interesting physical interpretation, implementing a duality of the discrete gauge theory.  This will be an introductory talk, explaining basic ideas of quantum error correction before discussing the new codes.
C421 Physics and Astronomy Building
Apr 18 2023
1:30 pm - 2:30 pm

UW-PHYSICS-QIS : Charlie Marcus

We discuss the well-studied 2D josephson array as a paradigm for quantum coherence coexisting with classical complexity. Experimental aspects of this 40-year-old problem remain puzzling, and challenge theoretical methods.
C421 Physics and Astronomy Building
March 2023
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