|
3:30 p.m.
in Room 307 of the Optical Sciences Meinel Building
|
Speaker: |
Poul Jessen
University of Arizona
College of Optical Sciences |
|
Title: |
Quantum Control of Atomic Spins |
|
Host: |
Stanley Pau |
|
Abstract: |
Laboratory techniques to manipulate and observe
ultracold atoms make these a superb platform on which to develop
and test new ideas in quantum control and measurement. I will
discuss a series of recent experiments in which we use laser
light and magnetic fields to drive non-trivial quantum dynamics
of a large spin-angular momentum associated with an atomic
hyperfine ground state. The resulting nonlinear spin Hamiltonian
is sufficiently general to achieve universal quantum control
over the 2F+1 dimensional state space, and allows us to generate
arbitrary spin states and perform a full quantum state
reconstruction of the result. We have implemented and verified
time optimal controls to generate a broad variety of spin
states, as well as an adiabatic scheme to generate spin-squeezed
states for metrology. Most recently we have used our control and
measurement tools to realize a popular paradigm for quantum
chaos known as the kicked top. Direct observation of the phase
space dynamics of this system has given us an unprecedented look
at quantum/classical correspondence. In the future we hope to
extend our toolbox for control and measurement of individual
atoms and to apply it also to collective spins. Applications
include quantum metrology, quantum information processing and
simulations of quantum manybody physics. |
|