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BEGIN:VEVENT
SUMMARY:Welcome and Opening Remarks
DTSTART:20220516T130000Z
DTEND:20220516T131500Z
DTSTAMP:20231209T180100Z
UID:indico-contribution-164@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Roger Melko (Perimeter Institute & University of Wat
erloo)\, Ribhu Kaul (University of Kentucky)\, Emilie Huffman (Perimeter I
nstitute)\, Shailesh Chandrasekharan (Duke University)\n\nhttps://events.p
erimeterinstitute.ca/event/11/contributions/164/
URL:https://events.perimeterinstitute.ca/event/11/contributions/164/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Research Talk
DTSTART:20220516T180000Z
DTEND:20220516T184500Z
DTSTAMP:20231209T180100Z
UID:indico-contribution-167@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Fakher Assaad (University of Wuerzburg)\n\nhttps://e
vents.perimeterinstitute.ca/event/11/contributions/167/
URL:https://events.perimeterinstitute.ca/event/11/contributions/167/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Fractionalized fermionic quantum criticality
DTSTART:20220519T201500Z
DTEND:20220519T210000Z
DTSTAMP:20231209T180100Z
UID:indico-contribution-185@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Lukas Janssen (Technical University Dresden)\n\nIn f
rustrated magnets\, novel phases characterized by fractionalized excitatio
ns and emergent gauge fields can occur. A paradigmatic example is given by
the Kitaev model of localized spins 1/2 on the honeycomb lattice\, which
realizes an exactly solvable quantum spin liquid ground state with Majoran
a fermions as low-energy excitations. I will demonstrate that the Kitaev s
olution can be generalized to systems with spin and orbital degrees of fre
edom. The phase diagrams of these Kitaev-Kugel-Khomskii spin-orbital magne
ts feature a variety of novel phases\, including different types of quantu
m liquids\, as well as conventional and unconventional long-range-ordered
phases\, and interesting phase transitions in between. In particular\, I w
ill discuss the example of a continuous quantum phase transition between a
Kitaev spin-orbital liquid and a symmetry-broken phase. This transition c
an be understood as a realization of a fractionalized fermionic quantum cr
itical point.\n\nhttps://events.perimeterinstitute.ca/event/11/contributio
ns/185/
URL:https://events.perimeterinstitute.ca/event/11/contributions/185/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Data-enhanced variational Monte Carlo for Rydberg atom arrays
DTSTART:20220518T213000Z
DTEND:20220518T215000Z
DTSTAMP:20231209T180100Z
UID:indico-contribution-191@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Stefanie Czischek (Perimeter Institute & University
of Waterloo)\n\nRydberg atom arrays are programmable quantum simulators ca
pable of preparing interacting qubit systems in a variety of quantum state
s. However\, long experimental state preparation times limit the amount of
measurement data that can be generated at reasonable timescales\, posing
a challenge for the reconstruction and characterization of quantum states.
Over the last years\, neural networks have been explored as a powerful an
d systematically tuneable ansatz to represent quantum wavefunctions. These
models can be efficiently trained from projective measurement data or thr
ough Hamiltonian-guided variational Monte Carlo. In this talk\, I will com
pare the data-driven and Hamiltonian-driven training procedures to reconst
ruct ground states of two-dimensional Rydberg atom arrays. I will discuss
the limitations of both approaches and demonstrate how pretraining on a sm
all amount of measurement data can significantly reduce the convergence ti
me for a subsequent variational optimization of the wavefunction.\n\nhttps
://events.perimeterinstitute.ca/event/11/contributions/191/
URL:https://events.perimeterinstitute.ca/event/11/contributions/191/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quantum steampunk: Quantum information meets thermodynamics
DTSTART:20220518T180000Z
DTEND:20220518T190000Z
DTSTAMP:20231209T180100Z
UID:indico-contribution-177@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Nicole Yunger Halpern (University of Maryland)\n\nTh
ermodynamics has shed light on engines\, efficiency\, and time’s arrow s
ince the Industrial Revolution. But the steam engines that powered the Ind
ustrial Revolution were large and classical. Much of today’s technology
and experiments are small-scale\, quantum\, far from equilibrium\, and pro
cessing information. Nineteenth-century thermodynamics needs re-envisionin
g for the 21st century. Guidance has come from the mathematical toolkit of
quantum information theory. Applying quantum information theory to thermo
dynamics sheds light on fundamental questions (e.g.\, how does entanglemen
t spread during quantum thermalization? How can we distinguish quantum hea
t from quantum work?) and practicalities (e.g.\, quantum engines and the t
hermodynamic value of coherences). I will overview how quantum information
theory is being used to revolutionize thermodynamics in quantum steampunk
\, named for the steampunk genre of literature\, art\, and cinema that jux
taposes futuristic technologies with 19th-century settings.\n\nhttps://eve
nts.perimeterinstitute.ca/event/11/contributions/177/
URL:https://events.perimeterinstitute.ca/event/11/contributions/177/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Anomalies and symmetric mass generation for staggered fermions –
Talk 1
DTSTART:20220520T130000Z
DTEND:20220520T134500Z
DTSTAMP:20231209T180100Z
UID:indico-contribution-186@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Simon Catterall (Syracuse University)\n\nhttps://eve
nts.perimeterinstitute.ca/event/11/contributions/186/
URL:https://events.perimeterinstitute.ca/event/11/contributions/186/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Blackboard Talk 1 - Virtual
DTSTART:20220516T131500Z
DTEND:20220516T140000Z
DTSTAMP:20231209T180100Z
UID:indico-contribution-165@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Senthil Todadri (Massachusetts Institute of Technolo
gy)\n\nhttps://events.perimeterinstitute.ca/event/11/contributions/165/
URL:https://events.perimeterinstitute.ca/event/11/contributions/165/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Blackboard Talk 2 - Virtual
DTSTART:20220516T143000Z
DTEND:20220516T151500Z
DTSTAMP:20231209T180100Z
UID:indico-contribution-166@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Senthil Todadri (Massachusetts Institute of Technolo
gy)\n\nhttps://events.perimeterinstitute.ca/event/11/contributions/166/
URL:https://events.perimeterinstitute.ca/event/11/contributions/166/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Deconfined quantum critical points with emergent SO(5) symmetry in
fermionic models
DTSTART:20220520T151500Z
DTEND:20220520T160000Z
DTSTAMP:20231209T180100Z
UID:indico-contribution-188@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Hong Yao (Tsinghua University)\n\nhttps://events.per
imeterinstitute.ca/event/11/contributions/188/
URL:https://events.perimeterinstitute.ca/event/11/contributions/188/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Anomalies and symmetric mass generation for staggered fermions –
Talk 2
DTSTART:20220520T141500Z
DTEND:20220520T150000Z
DTSTAMP:20231209T180100Z
UID:indico-contribution-187@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Simon Catterall (Syracuse University)\n\nhttps://eve
nts.perimeterinstitute.ca/event/11/contributions/187/
URL:https://events.perimeterinstitute.ca/event/11/contributions/187/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quantum electrodynamics with massless fermions in three dimensions
- Talk 1
DTSTART:20220517T130000Z
DTEND:20220517T134500Z
DTSTAMP:20231209T180100Z
UID:indico-contribution-170@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Rajamani Narayanan (Florida International University
)\n\nhttps://events.perimeterinstitute.ca/event/11/contributions/170/
URL:https://events.perimeterinstitute.ca/event/11/contributions/170/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quantum electrodynamics with massless fermions in three dimensions
- Talk 2
DTSTART:20220517T141500Z
DTEND:20220517T150000Z
DTSTAMP:20231209T180100Z
UID:indico-contribution-171@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Rajamani Narayanan (Florida International University
)\n\nhttps://events.perimeterinstitute.ca/event/11/contributions/171/
URL:https://events.perimeterinstitute.ca/event/11/contributions/171/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A Sport and a Pastime: Model design and computation for quantum cr
iticality\, gauge fields and matter
DTSTART:20220518T130000Z
DTEND:20220518T134500Z
DTSTAMP:20231209T180100Z
UID:indico-contribution-174@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Zi Yang Meng (University of Hong Kong)\n\nhttps://e
vents.perimeterinstitute.ca/event/11/contributions/174/
URL:https://events.perimeterinstitute.ca/event/11/contributions/174/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Thank you and Good-Bye
DTSTART:20220520T183000Z
DTEND:20220520T183500Z
DTSTAMP:20231209T180100Z
UID:indico-contribution-190@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Emilie Huffman (Perimeter Institute)\, Roger Melko (
Perimeter Institute & University of Waterloo)\, Ribhu Kaul (University of
Kentucky)\, Shailesh Chandrasekharan (Duke University)\n\nhttps://events.p
erimeterinstitute.ca/event/11/contributions/190/
URL:https://events.perimeterinstitute.ca/event/11/contributions/190/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Emergibility: from lattice spins to critical gauge theories and be
yond - Talk 1
DTSTART:20220519T130000Z
DTEND:20220519T134500Z
DTSTAMP:20231209T180100Z
UID:indico-contribution-181@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Chong Wang (Perimeter Institute)\n\nhttps://events.p
erimeterinstitute.ca/event/11/contributions/181/
URL:https://events.perimeterinstitute.ca/event/11/contributions/181/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Emergibility: from lattice spins to critical gauge theories and be
yond - Talk 2
DTSTART:20220519T141500Z
DTEND:20220519T150000Z
DTSTAMP:20231209T180100Z
UID:indico-contribution-182@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Chong Wang (Perimeter Institute)\n\nhttps://events.p
erimeterinstitute.ca/event/11/contributions/182/
URL:https://events.perimeterinstitute.ca/event/11/contributions/182/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Bootstrapping critical gauge theories
DTSTART:20220519T191500Z
DTEND:20220519T200000Z
DTSTAMP:20231209T180100Z
UID:indico-contribution-184@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Yin-Chen He (Perimeter Institute)\n\nI will talk abo
ut our recent progress on bootstrapping critical gauge theories. In specif
ic\, I will first introduce the current understanding that why bootstrap w
orks\, for example\, why a CFT can sit at a kink of bootstrap bounds and w
hy CFT can be isolated as an island. Then\, I will apply these idea to a p
rototypical critical gauge theory--the scalar QED (i.e. SU(N) deconfined p
hase transition)\, and demonstrate it can be isolated in a bootstrap islan
d when the matter flavour is large.\n\nhttps://events.perimeterinstitute.c
a/event/11/contributions/184/
URL:https://events.perimeterinstitute.ca/event/11/contributions/184/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Self dual U(1) lattice field theory with a theta-term
DTSTART:20220516T201500Z
DTEND:20220516T210000Z
DTSTAMP:20231209T180100Z
UID:indico-contribution-169@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Christoff Gattringer (Austrian Science Fund)\n\nStar
ting from the Villain formulation with an additional constraint we constru
ct a self-dual lattice version of U(1) field theory with a theta-term. An
interesting feature is that the self-dual symmetry gives rise to an action
that is local but not ultra-local\, similar to lattice actions that imple
ment chiral symmetry. We outline how electric and magnetic matter can be c
oupled in a self-dual way and discuss the emerging symmetry structure with
the theta term. We present results from a Monte Carlo simulation of the s
elf-dual system with electric and magnetic matter and explore spontaneous
breaking of the self-dual symmetry.\n\nhttps://events.perimeterinstitute.c
a/event/11/contributions/169/
URL:https://events.perimeterinstitute.ca/event/11/contributions/169/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Deconfined multi-criticality in quantum spin models and experiment
s
DTSTART:20220517T191500Z
DTEND:20220517T200000Z
DTSTAMP:20231209T180100Z
UID:indico-contribution-173@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Anders Sandvik (Boston University)\n\nIn the origina
l field theoretical scenario of deconfined quantum criticality\, the decon
fined quantum-critical point (DQCP) separating antiferromagnetic (AFM) and
singlet-solid phases of quantum magnets is generic\, i.e.\, does not requ
ire fine-tuning. Recent numerical studies instead point to a fine-tuned mu
lti-critical DQCP [1] that is also the end-point of a gapless spin liquid
phase [2]. An example is the Shastry-Sutherland (SS) model\, where a narro
w spin liquid phase was recently detected [2\,3]\, instead of the previous
ly argued direct transition between plaquette singlet solid (PSS) and AFM
phases. The multi-critical DQCP\, followed by a direct transition without
intervening spin liquid\, can be reached when other interactions are inclu
ded. Very recent NMR experiments on the SS compound SrCu2(BO3)2 under high
pressures and high magnetic fields are consistent with this scenario [4].
Low-temperature (below 0.1 K) direct PSS to XY-AFM transitions were obser
ved that become less strongly first-order at higher pressures. At the high
est pressure\, quantum-critical scaling of the spin-lattice relaxation was
observed\, indicating close proximity to a DQCP. This point may be the en
d-point of a not yet confirmed quantum spin liquid phase existing at sligh
tly higher pressures.\n\n[1] B. Zhao\, J. Takahashi\, and A. W. Sandvik\,
PRL 125\, 257204 (2020).\n[2] J. Yang\, A. W. Sandvik\, and L. Wang\, PRB
105\, L060409 (2022).\n[3] L. Wang\, Y. Zhang\, and A. W. Sandvik\, arXiv:
2205.02476\n[4] Y. Cui et al.\, arXiv:2204.08133.\n\nhttps://events.perime
terinstitute.ca/event/11/contributions/173/
URL:https://events.perimeterinstitute.ca/event/11/contributions/173/
END:VEVENT
BEGIN:VEVENT
SUMMARY:(Multi-)Critical Point\, and Potential Realization with infinite F
ractal Symmetries
DTSTART:20220520T170000Z
DTEND:20220520T174500Z
DTSTAMP:20231209T180100Z
UID:indico-contribution-189@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Cenke Xu (University of California\, Santa Barbara)\
n\nIn the last few years the concept of symmetry has been significantly ex
panded. One exotic example of the generalized symmetries\, is the “type-
II subsystem symmetry”\, where the conserved charge is defined on a frac
tal sublattice of an ordinary lattice. In this talk we will discuss exampl
es of models with the fractal symmetries. In particular\, we will introduc
e a quantum many-body model with a “Pascal’s triangle symmetry”\, wh
ich is an infinite series of fractal symmetries\, including the better kno
wn Sierpinski-triangle fractal symmetry. We will also construct a gapless
multicritical point with the Pascal’s triangle symmetry\, where the gene
rator of all the fractal symmetries decay with a power-law. If time permit
s\, we will also mention a few potential experimental realizations for mod
els with fractal symmetries.\n\nhttps://events.perimeterinstitute.ca/event
/11/contributions/189/
URL:https://events.perimeterinstitute.ca/event/11/contributions/189/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Multiband superconductivity and the breaking of time reversal symm
etry
DTSTART:20220519T180000Z
DTEND:20220519T184500Z
DTSTAMP:20231209T180100Z
UID:indico-contribution-183@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Igor Herbut (Simon Fraser University)\n\nI will disc
uss how spontaneous breaking of time reversal symmetry in multiband superc
onductors leads quite generally to the formation of small Fermi surfaces o
f Bogoliubov excitations\, irrespective of whether inversion symmetry is a
bsent or present in the superconducting state. In the latter case the inve
rsion symmetry is susceptible to being dynamical broken at low temperatur
es by the residual interactions. A lattice model of this process will be d
iscussed. Its final result is a reduced\, but still finite Bogoliubov-Fer
mi surface.\n\nhttps://events.perimeterinstitute.ca/event/11/contributions
/183/
URL:https://events.perimeterinstitute.ca/event/11/contributions/183/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Dirac criticality from field theory beyond the leading order
DTSTART:20220518T141500Z
DTEND:20220518T150000Z
DTSTAMP:20231209T180100Z
UID:indico-contribution-175@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Michael Scherer (Ruhr University Bochum )\n\nTwo-dim
ensional gapless Dirac fermions emerge in various condensed-matter setting
s. In the presence of interactions such Dirac systems feature critical poi
nts and the precision determination of their exponents is a prime challeng
e for quantum many-body methods. In a field-theoretical language\, these c
ritical points can be described by Gross-Neveu-Yukawa-type models and in m
y talk I will show some results on Gross-Neveu critical behavior using fie
ld theoretical approaches beyond the leading order. To that end\, I will f
irst present higher-loop perturbative RG calculations for generic Gross-Ne
veu-Yukawa models and compare estimates for the exponents with recent corr
esponding results from Quantum Monte Carlo simulations and the conformal b
ootstrap. Then\, I will discuss a more exotic variant of Gross-Neveu-Yukaw
a models which describes the interacting fractionalized excitations of two
-dimensional frustrated spin-orbital magnets. Here\, we have provided fiel
d-theoretical estimates for the critical exponents employing higher-order
epsilon expansion\, large-N calculations\, and functional renormalization
group.\n\nhttps://events.perimeterinstitute.ca/event/11/contributions/175/
URL:https://events.perimeterinstitute.ca/event/11/contributions/175/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Probing sign structure using measurement-induced entanglement
DTSTART:20220518T151500Z
DTEND:20220518T160000Z
DTSTAMP:20231209T180100Z
UID:indico-contribution-176@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Tim Hsieh (Perimeter Institute)\n\nThe sign structur
e of quantum states is closely connected to quantum phases of matter\, yet
detecting such fine-grained properties of amplitudes is subtle. We emplo
y as a diagnostic measurement-induced entanglement (MIE)-- the average ent
anglement generated between two parties after measuring the rest of the sy
stem. We propose that for a sign-free state\, the MIE upon measuring in t
he sign-free basis decays no slower than correlations in the state before
measurement. Concretely\, we prove that MIE is upper bounded by mutual in
formation for sign-free stabilizer states (essentially CSS codes)\, which
establishes a bound between scaling dimensions of conformal field theories
describing measurement-induced critical points in stabilizer systems. We
also show that for sign-free qubit wavefunctions\, MIE between two qubits
is upper bounded by a simple two-point correlation function\, and we veri
fy our proposal in several critical ground states of one-dimensional syste
ms\, including the transverse field and tri-critical Ising models. In con
trast\, for states with sign structure\, such bounds can be violated\, as
we illustrate in critical hybrid circuits involving both Haar or Clifford
random unitaries and measurements\, and gapless symmetry-protected topolog
ical states.\n\nhttps://events.perimeterinstitute.ca/event/11/contribution
s/176/
URL:https://events.perimeterinstitute.ca/event/11/contributions/176/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Superconductivity\, charge density wave\, and supersolidity in fla
t bands with tunable quantum metric
DTSTART:20220518T193000Z
DTEND:20220518T201500Z
DTSTAMP:20231209T180100Z
UID:indico-contribution-178@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Johannes Hofmann (Weizmann Institute of Science)\n\n
Predicting the fate of an interacting system in the limit where the electr
onic bandwidth is quenched is often highly non-trivial. The complex interp
lay between interactions and quantum fluctuations driven by the band geome
try can drive a competition between various ground states\, such as charge
density wave order and superconductivity. In this work\, we study an elec
tronic model of topologically-trivial flat bands with a continuously tunab
le Fubini-Study metric in the presence of on-site attraction and nearest-n
eighbor repulsion\, using numerically exact quantum Monte Carlo simulation
s. By varying the electron filling and the spatial extent of the localized
flat-band Wannier wavefunctions\, we obtain a number of intertwined order
s. These include a phase with coexisting charge density wave order and sup
erconductivity\, i.e.\, a supersolid. In spite of the non-perturbative nat
ure of the problem\, we identify an analytically tractable limit associate
d with a `small' spatial extent of the Wannier functions\, and derive a lo
w-energy effective Hamiltonian that can well describe our numerical result
s.\n\nhttps://events.perimeterinstitute.ca/event/11/contributions/178/
URL:https://events.perimeterinstitute.ca/event/11/contributions/178/
END:VEVENT
BEGIN:VEVENT
SUMMARY:New topological phases in the Kitaev model as a function of magnet
ic field
DTSTART:20220517T180000Z
DTEND:20220517T184500Z
DTSTAMP:20231209T180100Z
UID:indico-contribution-172@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Nandini Trivedi (Ohio State University)\n\n"The Kita
ev model with anisotropic interactions on the bonds of a honeycomb lattice
is a paradigmatic model for quantum spin liquids. Despite the simplicity
of the model\, a rich phase diagram with gapless and gapped quantum spin l
iquid phases\, with abelian and non-abelian excitations\, are revealed as
a function of a magnetic field and bond couplings. Our results of the enta
nglement entropy\, topological entanglement entropy\, and the dynamical sp
in excitation spectrum\, are obtained using exact diagonalization and dens
ity matrix renormalization group (DMRG) methods. We provide insights into
the phases from the underlying effective field theories. \n\nIn collabor
ation with Shi Feng\, Cullen Gantenberg\, Adhip Agarwala\, Subhro Bhattach
arjee \n\n[1] Signatures of magnetic-field-driven quantum phase transition
s in the entanglement entropy and spin dynamics of the Kitaev honeycomb mo
del\, David C. Ronquillo\, Adu Vengal\, Nandini Trivedi\, Phys. Rev. B 99\
, 140413 (2019) \n\n[2] Magnetic field induced intermediate quantum spin-l
iquid with a spinon Fermi surface\, Niravkumar D. Patel and Nandini Trived
i\, Proceedings of the National Academy of Sciences 116\, 12199 (2019). \n
\n[3] Two-Magnon Bound States in the Kitaev Model in a [111]-Field\, Subha
sree Pradhan\, Niravkumar D. Patel\, Nandini Trivedi\, Phys. Rev. B 101\,
180401 (2020) \n\n[4] Symmetry Analysis of Tensors in the Honeycomb Lattic
e of Edge-Sharing Octahedra\, Franz G. Utermohlen\, Nandini Trivedi\, Phys
. Rev. B 103\, 155124 (2021) "\n\nhttps://events.perimeterinstitute.ca/eve
nt/11/contributions/172/
URL:https://events.perimeterinstitute.ca/event/11/contributions/172/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Neural annealing and visualization of autoregressive neural networ
ks
DTSTART:20220518T203000Z
DTEND:20220518T211500Z
DTSTAMP:20231209T180100Z
UID:indico-contribution-179@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Estelle Inack (Perimeter Institute)\n\nArtificial ne
ural networks have been widely adopted as ansatzes to study classical and
quantum systems. However\, some notably hard systems such as those exhibit
ing glassiness and frustration have mainly achieved unsatisfactory results
despite their representational power and entanglement content\, thus\, su
ggesting a potential conservation of computational complexity in the learn
ing process. We explore this possibility by implementing the neural anneal
ing method with autoregressive neural networks on a model that exhibits gl
assy and fractal dynamics: the two-dimensional Newman-Moore model on a tri
angular lattice. We find that the annealing dynamics is globally unstable
because of highly chaotic loss landscapes. Furthermore\, even when the cor
rect ground state energy is found\, the neural network generally cannot fi
nd degenerate ground-state configurations due to mode collapse. These find
ings indicate that the glassy dynamics exhibited by the Newman-Moore model
caused by the presence of fracton excitations in the configurational spac
e likely manifests itself through trainability issues and mode collapse in
the optimization landscape.\n\nhttps://events.perimeterinstitute.ca/event
/11/contributions/179/
URL:https://events.perimeterinstitute.ca/event/11/contributions/179/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Reducing the Sign Problem with Complex Neural Networks
DTSTART:20220516T190000Z
DTEND:20220516T194500Z
DTSTAMP:20231209T180100Z
UID:indico-contribution-168@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Johann Ostmeyer (University of Liverpool)\n\nThe sig
n problem is arguably the greatest weakness of the otherwise highly effici
ent\, non-perturbative Monte Carlo simulations. Recently\, considerable pr
ogress has been made in alleviating the sign problem by deforming the inte
gration contour of the path integral into the complex plane and applying m
achine learning to find near-optimal alternative contours. This deformatio
n however requires a Jacobian determinant calculation which has a generic
computational cost scaling as volume cubed. In this talk I am going to pre
sent a new architecture with linear runtime\, based on complex-valued affi
ne coupling layers.\n\nhttps://events.perimeterinstitute.ca/event/11/contr
ibutions/168/
URL:https://events.perimeterinstitute.ca/event/11/contributions/168/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quantum Criticality in the 2+1d Thirring Model
DTSTART:20220520T174500Z
DTEND:20220520T183000Z
DTSTAMP:20231209T180100Z
UID:indico-contribution-195@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Simon Hands (University of Liverpool)\n\n"The Thirri
ng Model is a covariant quantum field theory of interacting fermions\, sha
ring many features in common with effective theories of two-dimensional el
ectronic systems with linear dispersion such as graphene.\n\nFor a small n
umber of flavors and sufficiently strong interactions the ground state may
be disrupted by condensation of particle- hole pairs leading to a quantum
critical point. With no small dimensionless parameters in play in this re
gime the Thirring model is plausibly the simplest theory of fermions requi
ring a numerical solution.\n\nI will review what is currently known focuss
ing on recent results and challenges from simulations employing Domain Wal
l Fermions\, a formulation drawn from state-of-the-art lattice QCD\, to fa
ithfully capture the underlying symmetries at the critical point."\n\nhttp
s://events.perimeterinstitute.ca/event/11/contributions/195/
URL:https://events.perimeterinstitute.ca/event/11/contributions/195/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A minimalist's approach to the physics of emergence
DTSTART:20220518T215000Z
DTEND:20220518T221000Z
DTSTAMP:20231209T180100Z
UID:indico-contribution-196@events.perimeterinstitute.ca
DESCRIPTION:Speakers: Liujun Zou (Perimeter Institute)\n\nOne of the centr
al themes of quantum many-body physics and quantum field theory is the eme
rgence of universality classes. In general\, determining which universalit
y class emerges in a quantum many-body system is a highly complex problem.
I will argue that the perspective of quantum anomaly provides powerful in
sights to the understanding of the landscape of universality classes that
can emerge in a quantum matter\, and I will present some interesting appli
cations.\n\nhttps://events.perimeterinstitute.ca/event/11/contributions/19
6/
URL:https://events.perimeterinstitute.ca/event/11/contributions/196/
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