23.12 Chemistry of quantum entanglement dynamics
Considering multipartite entanglement as a chemical compound opens a new view on the entanglement dissipative evolution. In fact, the particles of environment represent nothing else but the solvent in which the entanglement compound dissociates! The solvent can act on the whole compound (global quantum noise) or particular elements of the compound (local quantum noise). The differences between these two mechanisms are in the presense of clustering stages in the case of global noise, when particles reassemble to form almost equal bipartitions, tripartions, etc.
More info: S. N. Filippov, A. A. Melnikov, and M. Ziman. Dissociation and annihilation of multipartite entanglement structure in dissipative quantum dynamics. Phys. Rev. A 88, 062328 (2013), E-print arXiv:1310.4790 [quant-ph], Download <<PDF>>
30.09 Feasible coupling of two superconducting resonators by a single trapped atom
We present a theoretical proposal how to couple (selectively) microwave radiation in two superconducting resonators via the Raman effect for an ion trap.
More info about the idea: <<presentation [pdf, 530kB]>>
16.09 Revealing noise tolerance of quantum entanglement
Promising advances of quantum information technologies rely on the physical phenomenon of entanglement, a particular form of correlations exhibited by composite systems. After being created, the entanglement typically decreases due to unavoidable external noises. To fight with this undesirable effect, scientists have developed quaint methods to maintain correlations such as error correction and entanglement concentration protocols, etc. However, the nature can hardly be deceived, so if the noise level exceeds some fundamental limit, then the entanglement is lost without any chance to be resuscitated by local operations. In our paper [S.N. Filippov and M. Ziman, Bipartite entanglement-annihilating maps: Necessary and sufficient conditions, Phys. Rev. A 88, 032316 (2013)], we find the fundamental limit of such entanglement annihilation for any type of physical noisy evolution. The obtained result is crucial for determining the ultimate length of quantum communication lines.
Links to the paper: http://pra.aps.org/abstract/PRA/v88/i3/e032316 (restricted access), http://arxiv.org/abs/1306.6525 (free access)
09.06 10th Central European Quantum Information Processing Workshop
This year, CEQIP was held in Valtice, Czech Republic. The participants, organization, scientific and social activities (and the venue of course) created a very nice atmosphere reflected in some photos. Our team "Friday" (which sounds quite interesting in Finnish) took part in the cipher game and was the third to solve the final riddle. BTW, guess the solution!
As to science, you can look at our poster (it is self-explaining).
01.06 Joining the group of Miroslav Grajcar in Comenius University
Our collaborative work with the experimental group of Miroslav Grajcar has been started this year, and my official part-time job in Comenius University within the Integrated Quantum Information Technology (IQIT) project began on June 1, 2013.
More information about the project is here.