У оквиру семинара Центра за изучавање комплексних система Института за физику у Београду, у четвртак, 11. септембра 2025. године у 14 часова у читаоници библиотеке „Др Драган Поповић“, др Лука Антонић (докторирао на Техниону, Израелском институту за технологију 2025. године) одржаће предавање:
The role of symmetry in measurement-induced currents
САЖЕТАК:
Quantum measurement alters a quantum state, and this can induce motion in the measured system [1, 2]. We study how these currents depend on the measured observable and identify the symmetries of the observable as the decisive factor [3]. Breaking inversion symmetry is sufficient to generate a current, but sizable currents require breaking time-reversal symmetry as well. Repeated measurements drive the system into an infinite-temperature steady state with no net current; however, persistent currents can survive in the steady state if the system is coupled to a cooling bath. The steady-state current depends non-monotonically on the measurement rate. Finally, while nondegenerate and infinitely fast local measurements suppress transport between different non-overlapping measurement regions, we show that they do not prevent loop currents confined within those regions.
[1] J. Ferreira, T. Jin, J. Mannhart, T. Giamarchi, and M. Filippone, Physical Review Letters 132, 136301 (2024).
[2] G. T. Landi, M. J. Kewming, M. T. Mitchison, and P. P. Potts, PRX Quantum 5, 020201 (2024).
[3] L. Antonić, Y. Kafri, D. Podolsky, and A. M. Turner, Physical Review B 111, 224305 (2025).