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How to count one photon and get a result of 1000 (Prof. A. Steinberg)

  • Date: May 29, 2018
  • Time: 14:30 - 15:30
  • Speaker: Prof. Dr. Aephraim M. Steinberg
  • Quantum Optics Group, Centre for Quantum Information & Quantum Control, Department of Physics, University of Toronto, Canada
  • Room: New Lecture Hall, Room B 0.32
  • Host: MPQ
I will present our recent experimental work using electromagnetically induced transparency in laser-cooled atoms to measure the nonlinear phase shift created by a single post-selected photon, and its enhancement through "weak-value amplification."

Put simply, due to the striking effects of "post-selective" quantum measurements, a (very uncertain) measurement of photon number can yield an average value much larger than one, even when it is carried out on a single photon. I will say a few words about possible practical applications of this "weak value amplification" scheme, and their limitations.

Time permitting, I will also describe other future and past work related to quantum measurement and ultracold atoms – in particular, we have implemented a quantum-information-inspired protocol to beat “Rayleigh’s curse” for resolving closely-separated spots in classical imaging; and we are progressing towards an experiment which will permit us to track where atoms spend their time while tunneling through an optical barrier.

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