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Calendar of Physics Talks Vienna
| Classical Holographic Codes |
| Speaker: | Enrice Brehm (LMU München) |
| Abstract: | im Rahmen des Seminars für Mathematische Physik: I present toy models for the AdS/CFT correspondence that model essential features
such as the Ryu-Takayanagi formula and bulk reconstruction properties. Recently Quantum Error Correcting Codes (QECC) were shown to fall into this class, mainly because of their very special entanglement structure. I want to present some models that are motivated by QECC and share the same features but without quantum correlations, as e.g. entanglement. We call them classical holographic codes.
They can be understood as concatenated probabilistic codes and can be represented
as networks uniformly covering hyperbolic space.
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| Date: | Tue, 25.10.2016 |
| Time: | 14:15 |
| Duration: | 60 min |
| Location: | Fakultät für Physik, Erwin-Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock |
| Contact: | S. Fredenhagen, H. Steinacker |
| Massive and supermassive neutrinos as dark matter |
| Speaker: | Patrick Ludl (Univ. of Southampton, U.K.) |
| Abstract: | im Rahmen des Teilchenphysikseminars |
| Date: | Tue, 25.10.2016 |
| Time: | 16:15 |
| Duration: | 60 min |
| Location: | Fakultät für Physik, Erwin-Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock |
| Contact: | A. Hoang, H. Neufeld |
| Testing the quantum and gravity interface with single photons |
| Speaker: | Christopher Hilweg (Vienna) |
| Abstract: | Quantum theory and general relativity are considered the two pillars of modern physics. Their predictions are verified with spectacular precision on scales covering several orders of magnitude. Despite their success in describing nature, a unique framework reconciling these two theories is still missing. In this talk we will present a modified version of a Mach-Zehnder interferometer, capable of realizing the first table-top experiments probing jointly the quantum superposition principle and the mass-energy equivalence principle for single photons. The novel gravitational effects to be tested in this project arise when a single photon is travelling in a superposition along two paths located at different heights above earth and which are then brought to interfere. Due to the Shapiro delay, the travel time of a photon depends on the altitude of its path above earth. For the time . . . .
|
| Date: | Thu, 27.10.2016 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | Arbeitsgruppe Gravitation, Währinger Strasse 17, Raum 218, 2. Stock, 1090 Wien |
| Contact: | P.T. Chrusciel |
| Speaker: | Univ.Prof. Dr. Thomas A. Klar (Institute of Applied Physics Johannes Kepler University Linz Linz, Austria) |
| Abstract: | In
1873,
Ernst
Abbe
pointed
out
that
optics
below
the
dimensions
of
the
wavelength
of
light
is
pretty
cumbersome,
specifically
that
resolution
should
be
limited
by
diffraction.
This
claim
kept
its
dogmatic
character
for
one
century
until
Stefan
Hell
put
forward
the
idea
to
break
this
limit
in
fluorescence
microscopy
using
stimulated
emission
depletion
(STED).
We
are
now
using
STED
in
lithography
and
we
construct
sub-‐diffraction
patterns,
including
bio-‐inert
scaffolds
that
carry,
in
three
dimensional
space,
bio-‐functional
nanoanchors
which
allow
for
targeted
placement
of
proteins
or
oligonucleotides.
Another
approach
to
nanoscale
optics
is
plasmonics.
Multi-‐layered
gold/silver/oxide
nanostars
are
one
example
which
we
use
for
the
improvement
of
organic
LEDs
or
random
lasers.
Voltage-‐clamped
gold
nanoparticles
also
allow
for
an
optical
read-‐out
of
chemical
processes
at
their
sol |
| Date: | Thu, 27.10.2016 |
| Time: | 16:00 |
| Location: | TU Wien Freihaus Hörsaal 2 Wiedner Hauptstr. 8-‐10, 2nd floor |
| Contact: | Univ.Prof.Dr. Friedrich Aumayr |
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