From Nuclear Structure and Reactions to Quantum Information*

Atomic nucleus is an open quantum system with bound states and energy-dependent  reaction channels that act as multiple entrances and exits for quantum signals transformed by internal many-body interactions. If a nucleus lives in an excited state long enough, it comes to statistical equilibrium. The intrinsic thermalization leads to chaotic states, as we show by the exact solution of quantum equations. The results [1] demonstrate that, in distinction to classical mechanics, quantum interference does not show Lyapunov exponents being close to the limit of random matrices. On the other hand, the time-dependent nuclear process of excitation and deexcitation can be considered as the transmission of a quantum signal. From a stationary picture, we come to the problems of quantum information, with separated or overlapping resonances, possible super-radiance, noise, and decoherence.   

[1] A. Volya and V. Zelevinsky, J. Phys. Complexity 1, 025007 (2020); arXiv:1905.11918.