Institute of Physics Polish Academy of Sciences

The formal colloquium of the Institute of Physics, Polish Academy of Sciences it the main ongoing periodic series of lectures in physics and related science, of interest to members of the Institute. It is held from 1977. Colloquium speakers are primarily domestic and foreign scholars of established reputation, but also less-known physicists with remarkable and current scientific achievements. The colloquium is held once a month from September to June, usually at 3:15 PM on the last Tuesday of the month in the Auditorium of the Institute of Physics. Colloquia are open to the public, and are preceded by a coffee/the reception at the Institute.

For future information about the colloquia, pleace contact Prof. Dr. hab. Leszek Sirko (, current chairman of the colloquium committee.


We are pleased to announce that on June 25th 2019 (Tuesday) at 15:15 in the Institute of Physics, in the L. Sosnowski's auditorium will be held colloquium of the Institute of Physics PAS, in which:

Prof. Dr. hab. Marek Żukowski

from International Centre for Theory of Quantum Technologies (ICTQT), University of Gdańsk, will give a lecture entitled:

Entanglement indicators for quantum optical fields

We cordially invite to attend the colloquium and please to inform other interested persons. Before the colloquium, at 14:45, participants are welcome for coffee, tea and biscuits.

  Colloquium Committee


      We show that any multi-qudit entanglement witness leads to a non-separability indicator for quantum optical fields, which involves intensity correlation measurements and is useful for field states of undefined photon numbers. With the approach we get, e.g., necessary and sufficient conditions for intensity or intensity-rates correlations to reveal polarization entanglement. We also derive separability conditions for experiments with mutually unbiased multiport interferometers. Within the standard detector inefficiency model these entanglement indicators work for any detection efficiencies. For specific cases, we show advantages of using local intensity rates rather than intensities. The approach with rates allows a mapping of Bell inequalities for qudits to ones for optical fields. Our results may find applications also in studies of non-classicality of correlations in "macroscopic" many-body quantum systems of undefined or uncontrollable number of constituents.
[arXiv:1903.03526 ]