Squeezing of spin states for ultracold atoms
Speaker: Prof. Gediminas Juzeliūnas (Institute of Theoretical Physics and Astronomy, Vilnius University, Vilnius, Lithuania)
Date &Time: 12 December, 3 p.m. - 4 p.m.
In the initial part of the talk, there will be background material on individual and collective spins, collective spin states and squeezing of them. We will also talk about different spin-squeezing mechanisms including one-axis twisting (OAT) and two-axis counter-twisting (TACT) spin-squeezing models [1]. Spin squeezing is used in quantum metrology, such as for increasing the sensitivity of atomic clocks [2]. Subsequently, we will discuss possibilities to produce spin squeezing for spinful fermionic atoms in optical lattices. We will show that by applying laser radiation one can produce not only OAT but also TACT spin squeezing mechanisms [3,4], the latter TACT model providing better squeezing. Finally, we will mention ongoing research on producing non-classical spin states for an ensemble of atoms containing a larger spin, such as for strontium atoms characterised by spin 9/2 [5].
References:
1. L. Pezze, A. Smerzi, M. K. Oberthaler, R. Schmied, and P. Treutlein, Rev. Mod. Phys. 90, 035005 (2018).
2. A. Sinatra, Spin-squeezed states for metrology, Appl. Phys. Lett. 120, 120501 (2022).
3. T. Hernández Yanes, M. Płodzień, M. Mackoit Sinkevičienė, G. Žlabys, G. Juzeliūnas, E. Witkowska, One- and Two-Axis Squeezing via Laser Coupling in an Atomic Fermi-Hubbard Model, Phys. Rev. Lett. 129, 090403 (2022).
4. T. Hernández Yanes, G. Žlabys, M. Płodzień, D. Burba, M. Mackoit Sinkevičienė, E. Witkowska, G. Juzeliūnas, Spin squeezing in open Heisenberg spin chains, Phys. Rev. B 108, 104301 (2023).
5. D. Burba, H. Dunikowski, M. Robert-de-Saint-Vincent, E. Witkowska, G. Juzeliūnas, Effective light-induced Hamiltonian for atoms with large nuclear spin, arXiv:2404.12429 (2024).