Southwest Quantum Information and Technology

Measurement-based control of quantum chaos

Presenting Author: Sacha Greenfield, Carleton College
Contributing Author(s): Andre Carvalho, Arjendu K. Pattanayak

Recent results from Pokharel et al. observe quantum chaos in the Duffing oscillator without a corresponding classical attractor. In related work, Eastman et al. report measurement-angle-dependent chaos at the same parameters. We have investigated how semiclassical chaos arises for classically periodic systems, demonstrating that the choice of measurement scheme acts as a ``knob'' giving rise to the chaos. In doing this, we show that the semiclassical Duffing oscillator acts as a ``centroid'' oscillator in position and momentum coupled to a ``spread'' oscillator in the position-variance and its rate of change. We apply this new understanding to demonstrate measurement-based control of chaos.

(Session 5 : Thursday from 5:00pm - 7:00 pm)