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APPLIED PHYSICS Ph.D. DISSERTATION DEFENSE: Tori Borish

Department of Applied Physics

PhD Dissertation Defense  

 

 

Many-Body Spin Dynamics with Rydberg-Dressed Atoms

 

 

Tori Borish, PhD Candidate

Research Advisor: Professor Monika Schleier-Smith

 

Monday November 16, 2020 @ 2:00 PM Pacific Time

 

 

Zoom Linkhttps://stanford.zoom.us/j/92639490420?pwd=UXczYkxRQjRKaVlvdkkramtEWW5iZz09

(Email mariaf67@stanford.edu for password.)



 

Abstract

A fundamental challenge of quantum science is to introduce controllable interactions in well isolated quantum systems.  This is necessary for generating entangled many-body states with applications in the fields of quantum computing, quantum optimization, quantum metrology, and quantum simulations.  Controlling inter-particle interactions optically allows for them to be switchable, locally addressable, and tunable.  One way to do this is by exciting neutral atoms to Rydberg states, characterized by a high principal quantum number of the outer electron, which creates optically controlled long-range interactions.  In order to take advantage of both the long-range interactions of the Rydberg states and the long spin coherence times of ground state atoms, we off-resonantly couple a cold dilute gas of cesium atoms to Ryberg states, using a technique known as Rydberg dressing.

 

In this talk, I present the first experimental realization of the transverse-field Ising model with Rydberg dressing.  We demonstrate the creation of Ising interactions and characterize them via Ramsey spectroscopy, a step towards creating spin-squeezed states with finite range interactions.  By adding in a periodic microwave drive, we are able to detect dynamical signatures of the paramagnetic-to-ferromagnetic phase transition.  This work paves the way for many applications including creating arrays of spin-squeezed states via local optical control and implementing a many-qubit quantum gate.

 

November 16, 2020 - 2:00pm