SCL Seminar by Luka Antonić
You are cordially invited to the SCL seminar of the Center for the Study of Complex Systems, which will be held on Thursday, 11 September 2025 at 14:00 in the library reading room "Dr. Dragan Popović" of the Institute of Physics Belgrade. The talk entitled
The role of symmetry in measurement-induced currents
will be given by Dr Luka Antonić (PhD from Technion – Israel Institute of Technology 2025). The abstract of the talk:
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).