(Poster) Quantum bazooka using a perfect inverse filter in chaotic cavities

HERNAN L. CALVO; HORACIO M. PASTAWSKI

Bariloche, Rio Negro

Workshop; Workshop on "Physics of Nanostructures and Nanomaterials"; 2007

CNEA - Centro Atomico Bariloche

Refocusing of ultrasonic waves in heterogeneous media is made possible by the time-reversal mirror procedure developed experimentally by M. Fink: the propagation of a wave excitation generated by a local source is detected and recorded by a set of transducers that surrounds the control region (a closed cavity). Once the whole excitation escapes, all the registries are played back in the inversed time sequence and the wave propagates backwards until a form of the Loschmidt echo that appears at the source. The robustness of this technique against inhomogeneities allows many applications in medical physics, oceanography and telecommunications. In order to apply these concepts in a quantum system, we introduce a formal prescription to obtain perfect focusing called the perfect inverse filter. This last corrects the signals to be played-back by accounting for the correlations imposed by the system and could be used also in chains of classical coupled oscillators. We discuss the basics of these novel concepts and its implementation for a "quantum bazooka".