info:eu-repo/semantics/article
Time reversal mirror and perfect inverse filter in a microscopic model for sound propagation
Fecha
2007-09Registro en:
Calvo, Hernan Laureano; Danieli, Ernesto Pablo; Pastawski, Horacio Miguel; Time reversal mirror and perfect inverse filter in a microscopic model for sound propagation; Elsevier Science; Physica B: Condensed Matter; 398; 2; 9-2007; 317-320
0921-4526
CONICET Digital
CONICET
Autor
Calvo, Hernan Laureano
Danieli, Ernesto Pablo
Pastawski, Horacio Miguel
Resumen
Time reversal of quantum dynamics can be achieved by a global change of the Hamiltonian sign (a hasty Loschmidt daemon), as in the Loschmidt Echo experiments in NMR, or by a local but persistent procedure (a stubborn daemon) as in the time reversal mirror (TRM) used in ultrasound acoustics. While the first is limited by chaos and disorder, the last procedure seems to benefit from it. As a first step to quantify such stability we develop a procedure, the perfect inverse filter (PIF), that accounts for memory effects, and we apply it to a system of coupled oscillators. In order to ensure a numerical many-body dynamics intrinsically reversible, we develop an algorithm, the pair partitioning, based on the Trotter strategy used for quantum dynamics. We analyze situations where the PIF gives substantial improvements over the TRM.