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Experimental Demonstration of Coherent Control in Quantum Chaotic Systems
1Department of Physics & Astronomy and The Laboratory for Advanced Spectroscopy and Imaging Research (LASIR), The University of British Columbia, V6T 1Z1 Vancouver, Canada.
Physical Review Letters
|February 4, 2017
Summary
We achieved coherent control over chaotic quantum molecular dynamics. By manipulating laser pulse phases, we precisely controlled molecular angular momentum localization and energy, demonstrating quantum control
Area of Science:
- Quantum dynamics
- Molecular physics
- Nonlinear dynamics
Background:
- Classical systems exhibiting chaotic dynamics are difficult to control.
- Quantum systems can display unique behaviors, such as dynamical localization, in contrast to classical chaos.
- Controlling quantum chaotic systems remains a significant challenge.
Purpose of the Study:
- To experimentally demonstrate coherent control of a quantum system with classically chaotic dynamics.
- To investigate the phenomenon of dynamical localization in diatomic molecules interacting with laser pulses.
- To explore the sensitivity of quantum control to external field parameters.
Main Methods:
- Utilizing ultrashort laser pulses in a periodic sequence to interact with diatomic molecules.
- Preparing initial coherent wave packets with controlled rotational state phases.
- Analyzing the molecular angular momentum distribution and total energy of the localized state.
Main Results:
- Observed dynamical localization of molecular angular momentum, analogous to the quantum kicked rotor.
- Demonstrated control over the rotational distribution and total energy of the localized state by adjusting laser pulse phases.
- Confirmed the sensitivity of this quantum control to the kicking field parameters.
Conclusions:
- Coherent control of quantum chaotic systems is experimentally achievable.
- Dynamical localization provides a pathway for controlling molecular quantum dynamics.
- Quantum control effects diminish in the classical regime of excitation.
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