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Recent news:

o  ESO Telescope time awarded to CFT-led team!     

Prof. Bożena Czerny and her team were awarded the observing time with the ESO telescopes. Poland is the member of the European Southern Observatory (ESO) but this does not garantee a share of the observing time. The observing time is awadred through a selection process only to the best proposals. The project lead by B. Czerny received 7.3 hours on one of the four 8-meter VLT letescopes and 4 full observing nights on the 3.6-m NTT telescope in La Silla. Project aims to test whether the standard methods of the supermassive black hole mass measurements apply to all types of active galaxies. Planned observation of the polarized spectrum will show if the sources claimed to have extremely small masses and high accretion rates are actually seen along the symmetry axis and the previous black hole mass measurement is wrong by a factor ten. The team  consists of B. Czerny (PI), P. Marziani, J.-M. Wang, D. Pu, L. Popovic i V. Afanasiev. Observations will be performed in late autumn/winter period.

Added: 2016-07-09


o  Prof. Kazimierz Rzążewski was awarded with the honorary doctorate of the University of Stuttgart.     

Added: 2014-09-11


o  Experimentally friendly entanglement criteria.     

    Quantum entanglement – an amazing feature of quantum mechanics – is crucial in quantum information, quantum cryptography and many other, also interdisciplinary, fields of science.

From the practical point of view it is important to know faithful and possibly easy methods of quantum entanglement detection. For instance, some methods can be based on so called uncertainty relations, which significantly constraint (or not, depending on the presence of entanglement) the results of measurements.

The paper entitled „Reliable Entanglement Detection under Coarse-Grained Measurements” which has been published 21.05.2013r. in Physical Review Letters presents recent results of collaboration between dr. Łukasz Rudnicki from Center for Theoretical Physics PAS and the group from University of Rio de Janeiro led by dr. Stephen Walborn.

Łukasz Rudnicki is a recent PHD, who during last three years led two projects – one funded by Polish National Science Centre and one inside the Iuventus Plus 2011 program. He performs common research with one of the world’s leading group in the field of quantum optics, which at the University of Rio de Janeiro possesses a marvelous optical lab.

The main topic of the collaboration was entanglement criteria including experimental coarse graining. In the PRL paper the authors derive and experimentally test new entanglement criteria based on the famous Heisenberg uncertainty relation and Shannon entropies. The criteria take into account information about experimental coarse graining of an arbitrary magnitude. It was shown that for typical two-photon entangled states it is possible to decrease 17 times the experimental resolution and still get faithful entanglement detection. Obtained results have an advantage that they also prevent false entanglement detection in the case of separable states.

Added: 2013-05-27


o  Paper by T. Karpiuk, P. Deuar, P. Bienias, E. Witkowska, K. Pawłowski, M. Gajda, K. Rzążewski i M. Brewczyk, "Spontaneous Solitons in the Thermal Equilibrium of a Quasi-1D Bose Gas"     

    Solitons, or non-destructible local disturbances, are important features of many one-dimensional nonlinear wave phenomena. In a Bose-Einstein condensate confined to a cigar shaped trap they were observed already a decade ago. In all these experiments Solitons in the condensate were created by external perturbation. In the Letter published in Physical Review Letters (Phys. Rev. Lett., 109, 205302 (2012)) we have shown that such an external influence is not necessary. As it turns out, at thermal equilibrium, in nonzero temperature the solitons are generated spontaneously. To show this we used the, so called, classical fields approximation, developed earlier by our group. We argue that thermal solitons are just manifestations of the type II excitations discovered in 1963 by E. Lieb and W. Liniger.

Added: 2012-11-14


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