On 24/03/2026, at 1:15 PM, in room 2011 of the Faculty of Physics, University of Białystok, dr hab. Emilia Witkowska, prof IF PAN, will give a lecture entitled:
„Universal spin-squeezing dynamics in spin-1 atomic Bose-Einstein condensates.s”
Tomasz Karpiuk
Andrzej Maziewski
„Universal spin-squeezing dynamics in spin-1 atomic Bose-Einstein condensates.”
dr hab. Emilia Witkowska, prof IF PAN
Faculty of Physics and Astronomy, Institute of Spintronics and Quantum Information,Adam Mickiewicz University, Poznań
During the seminar I will discuss how spin-changing collisions in a spinor Bose-Einstein condensate, combined with an arbitrary quadratic Zeeman shift, can generate scalable spin squeezing in the collective spin of the ensemble, following the universal paradigm of the celebrated one-axis-twisting model. Squeezing dynamics is driven by the quadratic Zeeman shift when this shift is small; and by the spin-changing collisions for large shifts, in the form of stroboscopic squeezing. Turning off the Zeeman shift freezes out the collective-spin dynamics, so that the ensuing collective spin dynamics can be uniquely governed by an external field to be sensed. Our theoretical results pave the way for the use of spinor Bose gases with a large spin in fundamental studies of entanglement, as well as in advanced metrological applications.
