536 citations · 12.9k across the 243 of their papers we have counts for
9 papers · 1 filter
The Helstrom measurement: A nondestructive implementation
Rui Han, Gerd Leuchs, János A. Bergou
We discuss a novel implementation of the minimum error state discrimination measurement, originally introduced by Helstrom. In this implementation, instead of performing the optima…
Broadband bright twin beams and their up-conversion
Maria V. Chekhova, Semen Germanskiy, Dmitri B. Horoshko +5
We report on the observation of broadband (40 THz) bright twin beams through high-gain parametric down-conversion in an aperiodically poled lithium niobate crystal. The output phot…
Residual and Destroyed Accessible Information after Measurements
Rui Han, Gerd Leuchs, Markus Grassl
When quantum states are used to send classical information, the receiver performs a measurement on the signal states. The amount of information extracted is often not optimal due t…
Near optimal discrimination of binary coherent signals via atom-light interaction
Rui Han, János A. Bergou, Gerd Leuchs
We study the discrimination of weak coherent states of light with significant overlaps by nondestructive measurements on the light states through measuring atomic states that are e…
Unraveling beam self-healing
Andrea Aiello, Girish S. Agarwal, Martin Paúr +6
We show that, contrary to popular belief, non only diffraction-free beams may reconstruct themselves after hitting an opaque obstacle but also, for example, Gaussian beams. We unra…
Detection loss tolerant supersensitive phase measurement with an SU(1,1) interferometer
Mathieu Manceau, Gerd Leuchs, Farid Khalili +1
In an unseeded SU(1,1) interferometer composed of two cascaded degenerate parametric amplifiers, with direct detection at the output, we demonstrate a phase sensitivity overcoming…