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TT: Fachverband Tiefe Temperaturen
TT 44: Quantum Chaos (joint session DY/TT)
TT 44.3: Vortrag
Mittwoch, 18. März 2020, 15:45–16:00, HÜL 186
Controlling chaos in the quantum regime using adaptive measurements — •Jessica Eastman1,2,3, Stuart Szigeti1, Joseph Hope1, and André Carvalho3 — 1Department of Quantum Science, Research School of Physics and Engineering, The Australian National University, Canberra, ACT 2601, Australia — 2Centre for Quantum Computation and Communication Technology (Australian Research Council), Griffith University, Brisbane, Queensland 4111, Australia — 3Centre for Quantum Dynamics, Griffith University, Brisbane, Queensland 4111, Australia
The continuous monitoring of a quantum system strongly influences the emergence of chaotic dynamics near the transition from the quantum regime to the classical regime. Here we present a feedback control scheme that uses adaptive measurement techniques to control the degree of chaos in the driven-damped quantum Duffing oscillator. This control relies purely on the measurement backaction on the system, making it a uniquely quantum control, and is only possible due to the sensitivity of chaos to measurement. We quantify the effectiveness of our control by numerically computing the quantum Lyapunov exponent over a wide range of parameters. We demonstrate that adaptive measurement techniques can control the onset of chaos in the system, pushing the quantum-classical boundary further into the quantum regime.