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Center for Astrophysics Research and Technologies Seminar Series Information

 

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Coherent Matter Wave Circuits for Atomtronics

Thursday May 4, 2017
3:30 pm


 Presenter:  Malcolm Boshier, Los Alamos National Laboratory
 Series:  CQuIC Seminars
 Abstract:  The emerging field of atomtronics seeks to build atomic circuits in which currents are formed by coherent matter waves flowing inside complex waveguide structures. One motivation for developing this technology is creating waveguide atom interferometers, since they could be made much smaller than their free-space counterparts. In this talk I will present our recent work with atomtronic circuits aimed towards this goal. The technology used in all of this work is the Painted Potential, a combination of two red-detuned optical dipole traps. A rapidly-moving tweezer beam "paints" a desired 2D potential on top of a static horizontal light sheet. BECs created in the resulting time-averaged trap can then be manipulated by adiabatically changing the potential. One of the first atomtronic circuit devices studied was the BEC analog of the Superconducting Quantum Interference Device (SQUID). Both rf and dc atom-SQUIDs have now been demonstrated. In our dc device, a BEC was created in a toroidal potential with two thin potential barriers. We observed that the barriers behaved as ideal Josephson Junctions. I will discuss this work and our progress towards observing quantum interference in the atom-SQUID.
The Painted Potential can also realize and integrate the basic elements needed to create complex matter wave circuits. Tilting a waveguide containing a BEC will accelerate it to a desired velocity. We have propagated these moving condensates around bends connecting straight waveguides, around closed waveguide loops, and through Y-junctions which can act as switches and coherent beamsplitters. I will present these results and discuss the challenges associated with ensuring single-mode propagation in atomtronic circuits.
 Location:  Room 190, Physics & Astronomy

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