Generalized quantum measurements

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• Yan Pautrat (Orsay, France)
• Thursday 06 June 2019, 14:15-15:15
• MR13, Centre for Mathematical Sciences, Wilberforce Road, Cambridge.

If you have a question about this talk, please contact Sathyawageeswar Subramanian.

The standard, aka von Neumann measurements in quantum mechanics yield random results and result in a projection of the wave packet, where both effects are described by the Born rule. They have the property that subsequent measurements are entirely described by the first outcome, so that one learns very little studying the sequence of outcomes in repeated measurements. There exists another kind of measurements, called generalized or Kraus measurements, which appear e.g. when the measurement is not done directly on the system of interest but on a probe that interacts with it. In such cases, repeated measurements ``stay random’’, and the sequence of outcomes can give information on the system; the process of random states of the system undergoing the measurements is also of interest. I will review the general theory of these generalized measurements and discuss various results that I have worked on in the past few years.

This talk is part of the CQIF Seminar series.

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