Seminar Schedule
Find upcoming seminars below. All talks are also announced via our mailing list and are also available via a google calendar (ical). Previous talks as well as a copy of the slides will be made available for the foreseeable future on the VIDEOS page.
Thu 20200917 17:00 CEST
Quantum Science Seminar #18: Precision Measurement
PhysikalischTechnische Bundesanstalt Braunschweig and
Leibniz Universität Hannover — Germany
Leibniz Universität Hannover — Germany
Quantum Logic Spectroscopy of Trapped Ions
Precision spectroscopy is a driving force for the
development of our physical understanding. However,
only few atomic and molecular systems of interest have
been accessible for precision spectroscopy in the
past, since they miss a suitable transition for laser
cooling and internal state detection. This restriction
can be overcome in trapped ions through quantum logic
spectroscopy [1]. Coherent laser manipulation
originally developed in the context of quantum
information processing with trapped ions allows us to
combine the special spectroscopic properties of one
ion species (spectroscopy ion) with the excellent
control over another species (logic or cooling ion).
The logic ion provides sympathetic cooling and is used
to control and read out the internal state of the
spectroscopy ion. In my talk I will provide an
overview of different implementations and applications
of quantum logic spectroscopy to investigate
previously inaccessible species such as molecular
ions [2] and highly charged ions [3].
Spectroscopy of these species may reveal physics
beyond the standard model, such as new force carriers
or scalar fields that are dark matter candidates and
could induce a variation of fundamental constants, or
appear as nonlinearities in isotope shift
spectroscopy.
Thu 20200924 17:00 CEST
Quantum Science Seminar #19
Harvard University
Cambridge — Massachusetts — U.S.A.
Cambridge — Massachusetts — U.S.A.
Programmable quantum systems based on Rydberg atom arrays
We will discuss the recent advances involving
programmable, coherent manipulation of quantum
manybody systems using atom arrays excited into
Rydberg states. Specifically, we will describe our
recent technical upgrades that now allow the control
over 200 atoms in twodimensional arrays. Recent
progress involving the realization of exotic states of
matter, exploration of their nonequilibrium dynamics
as well as realization and testing quantum
optimization algorithms using such systems will be
discussed.
References

Probing manybody dynamics on a 51atom quantum simulatorNature5515792017

Quantum Kibble–Zurek mechanism and critical dynamics on a programmable Rydberg simulatorNature5682072019

Generation and manipulation of Schrödinger cat states in Rydberg atom arraysScience3655702019

Parallel implementation of highfidelity multiqubit gates with neutral atomsPhysical Review Letters1231705032019
Thu 20201001 17:00 CEST
Quantum Science Seminar #20: Quantum Simulation
Center for Quantum Physics, University of Innsbruck, and
IQOQI, Austrian Academy of Sciences
Innsbruck — Austria
IQOQI, Austrian Academy of Sciences
Innsbruck — Austria
Programmable Quantum Simulators with Atoms and Ions
Quantum optical systems with cold atoms and ions
provides one of the best ways to build controllable
quantum manybody systems as quantum computers and
quantum simulators. Here we report on recent
developments in building, and in particular
programming quantum simulators based on trapped ions
as intermediate scale quantum devices. Our discussion
will focus on hybrid classicalquantum scenarios: here
the quantum part is the generation of highly entangled
states on the quantum device in quench dynamics, which
is combined with a classical post processing of
measurement data, possibly run in a feedback loop with
the quantum device. Examples highlighting these
developments include the implementation of
selfverifying variational quantum simulations,
illustrated here by computing the ground state and
quantum phase transition of a Schwinger Model as 1D
QED. In addition, we develop and demonstrate a
‘randomized measurement toolbox’, allowing to access
in experiments quantities like Renyi entanglement
entropies and — as ongoing research — measure the
entanglement spectrum, i.e. ‘seeing the Schmidt
decomposition live’ in quench dynamics from an initial
product state towards thermodynamic equilibrium.
Confirmed Speakers
We are excited to announce that the following speakers have already agreed to give a talk in the next few weeks:
 Tilman Pfau
 Eugene Polzik
 Martin Plenio
 Christiane Koch
 Dima Budker