Bulletin of the American Physical Society
52nd Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 66, Number 6
Monday–Friday, May 31–June 4 2021; Virtual; Time Zone: Central Daylight Time, USA
Session H06: Collisions and Control with Atoms and Molecules
8:00 AM–9:48 AM,
Wednesday, June 2, 2021
Chair: Paul Julienne, JQI
Abstract: H06.00004 : Complete quantum coherent control of ultracold collisions
8:36 AM–8:48 AM
Live
Presenter:
Adrien Devolder
(Chemical Physics Theory Group, Department of Chemistry, and Center for Quantum Information and Quantum Control, University of Toronto)
Authors:
Adrien Devolder
(Chemical Physics Theory Group, Department of Chemistry, and Center for Quantum Information and Quantum Control, University of Toronto)
Paul Brumer
(Chemical Physics Theory Group, Department of Chemistry, and Center for Quantum Information and Quantum Control, University of Toronto)
Timur Tscherbul
(Department of Physics, University of Nevada)
Quantum coherent control is a promising approach free of these limitations and then complementary with the current methods. It is based on the coherent superposition of initial internal states, inducing interference of scattering amplitudes to a final state. Unfortunately, a large number of involved partial waves hamper the extent of control of integral cross-section (ICS). Therefore, ultracold temperatures are ideal conditions for coherent control.
We show that complete control of ICS is accessible when only a single partial wave is involved in both the incident and final collision channels (double s-wave regime). Destructive interference induces the vanishing of the ICS. With the example of spin-exchange scattering between O2 molecules, a huge control of ICS (10-4 to 105 Å2) and branching ratio (10-9 to 108) is demonstrated. Beyond the double s-wave regime, we demonstrated that one can completely control the contribution of one partial wave in ICS. A d-wave dominant scattering can be changed to an s-wave dominant scattering by tuning the relative phase of the initial superposition. Therefore, coherent control is also a powerful tool for tuning the partial wave expansion.
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700