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SUMMARY:Šimon Vedl (Macquarie University)
DTSTART;VALUE=DATE-TIME:20231205T070000Z
DTEND;VALUE=DATE-TIME:20231205T090000Z
DTSTAMP;VALUE=DATE-TIME:20240224T053253Z
UID:3cqfs/1
DESCRIPTION:Title: Wa
velets and Quantum Field Theory\nby Šimon Vedl (Macquarie University)
as part of Tricontinental Quantum Fundamentals Seminar\n\n\nAbstract\nIn
this talk I will go through the wavelet-related topics investigated by the
group at Macquarie University: Gavin Brennen\, Sukhwinder Singh (former c
ollaborator)\, Dan George\, Simon Vedl. These can be divided into two dist
inct categories\, applications of discrete wavelet transform\, and applica
tions of continuous wavelet transform.\n\nOur main focus is to understand
and utilise the extra variable introduced in the wavelet transform that is
often called the scale. The talk will begin with an introduction to wavel
et analysis and then proceed with discussion of state compression\, AdS/CF
T correspondence and wavelet regularisation of QFT by a scale cutoff.\n
LOCATION:https://researchseminars.org/talk/3cqfs/1/
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BEGIN:VEVENT
SUMMARY:Robert H. Jonsson (Nordic Institute for Theoretical Physics)
DTSTART;VALUE=DATE-TIME:20231121T070000Z
DTEND;VALUE=DATE-TIME:20231121T090000Z
DTSTAMP;VALUE=DATE-TIME:20240224T053253Z
UID:3cqfs/2
DESCRIPTION:Title: Ga
ussian states\, partner modes and an entanglement duality\nby Robert H
. Jonsson (Nordic Institute for Theoretical Physics) as part of Tricontine
ntal Quantum Fundamentals Seminar\n\n\nAbstract\nGaussian states appear ev
erywhere in quantum physics - from condensed matter\, to quantum optics an
d quantum field theory in curved spacetimes. In this talk I aim for three
objectives related to Gaussian states:\n\nFirst\, I discuss their partner
mode entanglement structure which is well known\, but maybe not widely kno
wn. This is the fact that a pure Gaussian state under any bipartition deco
mposes into a sum of two-mode squeezed states\, for example\, in the Unruh
effect or in Einstein-Bose condensates.\n\nSecond\, I review the powerful
Kähler structure formalism for Gaussian states. It captures the geometry
of Gaussian states\, it is very practical for applications\, and it treat
s both bosons and fermions simultaneously.\n\nThird\, to showcase an examp
le connecting bosonic and fermionic systems\, I will present an entangleme
nt duality which arises in supersymmetric Gaussian states [1]. Here\, boso
nic and fermionic partner subsystems\, canonically identified by the super
charge construction\, exhibit an intriguing duality of their entanglement
spectra.\n\n(Time permitting\, as a special application\, we consider topo
logical insulators and superconductors and their SUSY partners\, discussin
g the recently derived classification of supercharges in this context [2].
)\n\n[1] Jonsson\, Robert H.\, Lucas Hackl\, and Krishanu Roychowdhury.
“Entanglement Dualities in Supersymmetry.” Physical Review Research 3\
, no. 2 (June 16\, 2021): 023213.\n\n[2] Gong\, Zongping\, Robert H. Jonss
on\, and Daniel Malz. “Supersymmetric Free Fermions and Bosons: Locality
\, Symmetry\, and Topology.” Physical Review B 105\, no. 8 (February 24\
, 2022): 085423.\n
LOCATION:https://researchseminars.org/talk/3cqfs/2/
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BEGIN:VEVENT
SUMMARY:Joshua Foo (Stevens Institute of Technology)
DTSTART;VALUE=DATE-TIME:20230418T070000Z
DTEND;VALUE=DATE-TIME:20230418T090000Z
DTSTAMP;VALUE=DATE-TIME:20240224T053253Z
UID:3cqfs/3
DESCRIPTION:Title: Te
lefilters\, telemirrors\, and causality\nby Joshua Foo (Stevens Instit
ute of Technology) as part of Tricontinental Quantum Fundamentals Seminar\
n\n\nAbstract\nMode-selective interactions are ubiquitous in quantum optic
s and interacting quantum field theories. Such unitaries take as input a m
ulti-mode field but uniquely affect a single mode\, compared with those or
thogonal to it. Despite their wide application in theoretical and experime
ntal physics\, the temporal dimension of such interactions are typically i
gnored.\n\nHere\, I demonstrate how the naïve treatment of a mode-selecti
ve unitaries leads to the possibility of acausal signalling\, due to the t
acit assumption that certain kinds of idealised measurements of quantum fi
elds can be made. I achieve this by introducing new theoretical models for
mode-selective mirrors using continuous-variable teleportation\, which is
able to unveil the temporal aspects of the mode propagation.\n\nThe main
result is that mode-selective operations must generally enact a fundamenta
l time-delay on input modes that are delocalised in time. This result reso
lves Sorkin's long-standing "impossible measurement" problem in relativist
ic quantum field theory\, and thus has significant implications for experi
mental quantum optics and those working in quantum causality and field the
ory.\n
LOCATION:https://researchseminars.org/talk/3cqfs/3/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nicolas C. Menicucci (Royal Melbourne Institute of Technology)
DTSTART;VALUE=DATE-TIME:20230502T070000Z
DTEND;VALUE=DATE-TIME:20230502T090000Z
DTSTAMP;VALUE=DATE-TIME:20240224T053253Z
UID:3cqfs/4
DESCRIPTION:Title: Ta
chyonic media in sonic relativity\nby Nicolas C. Menicucci (Royal Melb
ourne Institute of Technology) as part of Tricontinental Quantum Fundament
als Seminar\n\n\nAbstract\nIn sonic models of special relativity\, the fac
t that the sonic medium violates (ordinary) Lorentz symmetry is apparent t
o observers external to the sonic medium but not to a class of observers e
xisting within the medium itself. We show that the situation is symmetric:
internal observers will judge physics in the external laboratory to viola
te their own sonic Lorentz symmetries. We therefore treat all observers on
an equal footing such that each is able to retain a commitment to their o
wn Lorentz symmetries.\n\nWe then generalize beyond the case of subsystem-
environment decompositions to situations in which there exist multiple pho
non fields\, all obeying Lorentz symmetries but with different invariant s
peeds. In such cases\, we argue that all observers have freedom to choose
which field is symmetry preserving\, and so -- in a certain precise sense
-- which other fields are perceived as having an 'ether.' This choice is i
nfluenced -- but not determined -- by a desire for simplicity in the descr
iption of physical laws.\n\nSending information faster than sound serves a
s a model of tachyonic signalling to a distant receiver. Immutable causali
ty of the laboratory setup when perceived externally to a sonic medium man
ifests internally through the confinement of the tachyons to an apparent e
ther (with a rest frame)\, which we call a 'tachyonic medium\,' thereby pr
eventing tachyonic exchange from emulating the scenario of a round-trip si
gnal travelling into an observer's past causal cone. The assignment of son
ic-Lorentz-violating effects to fields that obey 'photonic' Lorentz symmet
ries thus ensures that causality associated with the 'sonic' Lorentz symme
tries is preserved.\n
LOCATION:https://researchseminars.org/talk/3cqfs/4/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Dominic G. Lewis (Royal Melbourne Institute of Technology)
DTSTART;VALUE=DATE-TIME:20230516T070000Z
DTEND;VALUE=DATE-TIME:20230516T090000Z
DTSTAMP;VALUE=DATE-TIME:20240224T053253Z
UID:3cqfs/5
DESCRIPTION:Title: Ba
ndlimitation\, wavelets\, and scaled QFT\nby Dominic G. Lewis (Royal M
elbourne Institute of Technology) as part of Tricontinental Quantum Fundam
entals Seminar\n\n\nAbstract\nThe likely presence of a fundamental minimum
length scale to the universe (motivated by generalised uncertainty princi
ples and UV divergences in quantum field theory to name a few) has led to
the application of information theoretic techniques such as bandlimitation
to quantum field theory\, allowing for field theories to be represented a
s simultaneously continuous and discrete through Shannon theory.\n\nWe ext
end on this notion by showing that non-bandlimited quantum field theories
can be decomposed into bandlimited ones\, called scales\, using Shannon wa
velets. Each scale of the wavelet decomposition gives a field theory posse
ssing an ultraviolet cut-off (and infrared cut-off) and\, as a result\, an
equivalent discrete theory. As such\, one can use wavelets to decompose a
n $N+1$ dimensional continuous field theory into a $2N+1$ dimensional disc
rete theory (where the scale of the wavelet decomposition is treated as a
spatial dimension).\n\nLinked paper only covers the first (bandlimitation)
part of the talk and not wavelets\, which will be included in a future pa
per.\n
LOCATION:https://researchseminars.org/talk/3cqfs/5/
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BEGIN:VEVENT
SUMMARY:Carolyn Wood (University of Queensland)
DTSTART;VALUE=DATE-TIME:20230530T070000Z
DTEND;VALUE=DATE-TIME:20230530T090000Z
DTSTAMP;VALUE=DATE-TIME:20240224T053253Z
UID:3cqfs/6
DESCRIPTION:Title: Jo
urnal club on '*Harvesting quantum coherence from axion dark matter*'
\nby Carolyn Wood (University of Queensland) as part of Tricontinental
Quantum Fundamentals Seminar\n\n\nAbstract\nIn this week's meeting\, Caro
lyn Wood will lead the discussion of the recent article '*Harvesting qua
ntum coherence from axion dark matter*' by Sugumi Kanno\, Akira Matsumu
ra\, and Jiro Soda.\n
LOCATION:https://researchseminars.org/talk/3cqfs/6/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Magdalena Zych (Stockholm University)
DTSTART;VALUE=DATE-TIME:20230620T070000Z
DTEND;VALUE=DATE-TIME:20230620T090000Z
DTSTAMP;VALUE=DATE-TIME:20240224T053253Z
UID:3cqfs/7
DESCRIPTION:Title: Re
lativity of quantum superpositions\nby Magdalena Zych (Stockholm Unive
rsity) as part of Tricontinental Quantum Fundamentals Seminar\n\n\nAbstrac
t\nIt is anticipated that in a theory of quantum gravity\, there exist qua
ntum superpositions of semiclassical states of spacetime geometry. It is o
ften discussed how such states could arise from a source mass in a spatial
superposition. In this talk I will discuss such spatial superposition sce
narios from the perspective of relativity of the notion of location\, and
thus of superposition itself.\n
LOCATION:https://researchseminars.org/talk/3cqfs/7/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nicholas Funai (Royal Melbourne Institute of Technology)
DTSTART;VALUE=DATE-TIME:20231107T070000Z
DTEND;VALUE=DATE-TIME:20231107T090000Z
DTSTAMP;VALUE=DATE-TIME:20240224T053253Z
UID:3cqfs/8
DESCRIPTION:Title: Co
variant bandlimits and entanglement harvesting\nby Nicholas Funai (Roy
al Melbourne Institute of Technology) as part of Tricontinental Quantum Fu
ndamentals Seminar\n\n\nAbstract\nIn QFT UV cutoffs are often used as reno
rmalisation or calculational tools\, however sometimes these cutoffs can h
ave a physical origin\, e.g. condensed matter systems. These UV cutoffs al
so tend to overlook the need for Lorentz covariance in any notion of minim
um length.\n\nThis talk uses the covariant UV cutoff introduced by Kempf a
nd Pye\; and investigates its effects on entanglement harvesting and commu
nication\, with particular attention on causality violations and any non-l
ocal behaviour introduced by the cutoff.\n
LOCATION:https://researchseminars.org/talk/3cqfs/8/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Evan Gale (University of Queensland)
DTSTART;VALUE=DATE-TIME:20230307T070000Z
DTEND;VALUE=DATE-TIME:20230307T090000Z
DTSTAMP;VALUE=DATE-TIME:20240224T053253Z
UID:3cqfs/9
DESCRIPTION:Title: Re
lativistic Unruh-DeWitt detectors with quantized center of mass\nby Ev
an Gale (University of Queensland) as part of Tricontinental Quantum Funda
mentals Seminar\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/3cqfs/9/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Navdeep Arya (Stockholm University)
DTSTART;VALUE=DATE-TIME:20240305T080000Z
DTEND;VALUE=DATE-TIME:20240305T100000Z
DTSTAMP;VALUE=DATE-TIME:20240224T053253Z
UID:3cqfs/12
DESCRIPTION:by Navdeep Arya (Stockholm University) as part of Tricontinent
al Quantum Fundamentals Seminar\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/3cqfs/12/
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