Oct 29, 2020 3:45 pm - Virtual - Colloquium
Luis Sanchez-Soto - Max Planck Institut für die Physik des Lichts, Erlangen
Achieving the ultimate quantum resolution

The Rayleigh criterion specifies the minimum separation between two incoherent point sources that may be resolved into distinct objects. We revisit this problem by examining the Fisher information required for resolving the two sources. The resulting Cramér–Rao bound gives the minimum error achievable for any unbiased estimator. When only the intensity in the image plane is recorded, this bound diverges as the separation between the sources tends to zero, an effect that has been dubbed the Rayleigh curse. Nonetheless, this curse can be lifted with suitable measurements. In this seminar, I will demonstrate optimal strategies and present  experimental demonstrations that achieve the ultimate quantum limits. I will also discuss similar issues in the time-frequency domain.