IQC-QuICS Math and Computer Science SeminarExport this event to calendar

Tuesday, September 14, 2021 — 4:00 PM EDT

How to perform the coherent measurement of a curved phase space
Dr. Christopher Sahadev Jackson, Sandia National Laboratories

In quantum optics, the Hilbert space of a mode of light corresponds to functions on a plane called the phase space (so called because it reminded Boltzmann of oscillators in 2-d real space.)  This correspondence offers three important features:  it can autonomously handle quantum theoretical calculations, it allows for the infinite-dimensional Hilbert space to be easily visualized, and it is intimately related to a basic experimental measurement (the so-called heterodyne detection).  Continuous phase space correspondences exist naturally for many types of Hilbert space besides this particular infinite-dimensional one.  Specifically, the two-sphere is a natural phase space for quantum spin systems.  Although well studied on the theoretical and visualization fronts, the corresponding measurement (theoretically referred to as the spin-coherent-state positive-operator-valued measure or SCS POVM) has yet to find a natural way to be experimentally performed.  In this talk, I will review the history of phase space, it’s connection to representation theory, quantization, coherent states, and continuous measurement.

Finally, I will explain how the SCS POVM can be simply performed, independent of the quantization.  Such a demonstration is a fundamental contribution to the theory of continuous quantum measurement which revives several differential-geometric ideas from the classical and modern theory of complex semisimple Lie groups.

Join the seminar on Zoom!
Meeting link: https://uwaterloo.zoom.us/j/91715806521?pwd=QjBuWTBDODZOVitFVkV5WXU2dHhlUT09

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This virtual seminar is jointly sponsored by the Institute for Quantum Computing and the Joint Center for Quantum Information and Computer Science.


If you are interested in presenting at a future seminar, please email either Daniel Grier (daniel.grier@uwaterloo.ca) or Hakop Pashayan (hpashaya@uwaterloo.ca).

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