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BEGIN:VEVENT
SUMMARY:Netta Engelhardt (MIT)
DTSTART:20221206T140000Z
DTEND:20221206T150000Z
DTSTAMP:20260422T212932Z
UID:IASQubit2022/1
DESCRIPTION:Title: Complexity Coarse-Graining in the Black Hole Information Problem\
nby Netta Engelhardt (MIT) as part of Workshop on Spacetime and Quantum In
formation\n\nLecture held in Wolfensohn Hall.\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/IASQubit2022/1/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Aron Wall (University of Cambridge)
DTSTART:20221206T144500Z
DTEND:20221206T153000Z
DTSTAMP:20260422T212932Z
UID:IASQubit2022/2
DESCRIPTION:Title: Cauchy Slice Holography and the Information Paradox\nby Aron Wall
(University of Cambridge) as part of Workshop on Spacetime and Quantum In
formation\n\nLecture held in Wolfensohn Hall.\n\nAbstract\nCauchy slice ho
lography gives a duality between the wavefunction on a Cauchy slice and th
e partition function of a T2 deformed field theory. I will review this co
rrespondence and discuss its implications for the black hole information p
uzzle. The duality implies that postselection plays an important role in
the method by which information escapes to the exterior region.\n
LOCATION:https://researchseminars.org/talk/IASQubit2022/2/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jonathan Sorce (MIT)
DTSTART:20221206T161500Z
DTEND:20221206T170000Z
DTSTAMP:20260422T212932Z
UID:IASQubit2022/3
DESCRIPTION:Title: Causality and Entanglement in Holography: The Connected Wedge Theorem
Revisited\nby Jonathan Sorce (MIT) as part of Workshop on Spacetime a
nd Quantum Information\n\nLecture held in Wolfensohn Hall.\n\nAbstract\nOn
e puzzling aspect of holography is that it conjectures a duality between a
physical theory with a single rigid causal structure (the non-gravitation
al "boundary theory") and one whose causal structure is state-dependent (t
he gravitational "bulk theory"). In this talk\, I will explain how consist
ency of holographic quantum gravity can be used to constrain the entanglem
ent structure of a field theory state based on which sets of boundary poin
ts admit causal scattering in its gravitational dual. This constraint can
be argued for directly in the boundary theory using information-theoretic
reasoning\, and shown to hold in the bulk theory as a consequence of the q
uantum extremal surface formula for holographic entanglement entropy. I wi
ll also discuss how the gravitational reasoning used in this work suggests
theorems about relativistic information processing that can be proved dir
ectly in information theory\, without any reference to quantum gravity. Ba
sed on 1912.05649 and 2210.00018.\n
LOCATION:https://researchseminars.org/talk/IASQubit2022/3/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Brian Swingle (Brandeis University)
DTSTART:20221206T170000Z
DTEND:20221206T174500Z
DTSTAMP:20260422T212932Z
UID:IASQubit2022/4
DESCRIPTION:Title: Holographic Measurements and Quantum Teleportation\nby Brian Swin
gle (Brandeis University) as part of Workshop on Spacetime and Quantum Inf
ormation\n\nLecture held in Wolfensohn Hall.\n\nAbstract\nSpacetime wormho
les can lead to surprises in black hole physics. We show that a very old b
lack hole can tunnel to a white hole/firewall by emitting a large baby uni
verse. We study the process for a perturbed thermofield double black hole
in Jackiw-Teitelboim (JT) gravity\, using the lowest order (genus one) spa
cetime wormhole that corresponds to single baby-universe emission. The pro
bability for tunneling to a white hole is proportional to $t{^2}e{^−2S}$
where t is the age of the black hole and S is the entropy of one black ho
le.\n
LOCATION:https://researchseminars.org/talk/IASQubit2022/4/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Zhenbin Yang (Stanford University)
DTSTART:20221206T194500Z
DTEND:20221206T203000Z
DTSTAMP:20260422T212932Z
UID:IASQubit2022/5
DESCRIPTION:Title: Firewalls from Wormholes\nby Zhenbin Yang (Stanford University) a
s part of Workshop on Spacetime and Quantum Information\n\nLecture held in
Wolfensohn Hall.\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/IASQubit2022/5/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Henry Lin (Stanford University)
DTSTART:20221206T213000Z
DTEND:20221206T221500Z
DTSTAMP:20260422T212932Z
UID:IASQubit2022/7
DESCRIPTION:Title: Algebra and Geometry from Chords\nby Henry Lin (Stanford Universi
ty) as part of Workshop on Spacetime and Quantum Information\n\nLecture he
ld in Wolfensohn Hall.\n\nAbstract\nIn double-scaled SYK\, the chord diagr
ams of Berkooz et al. give rise to a bulk algebra and geometry. The algebr
a is a "quantum deformation" of the JT gravitational algebra that includes
a deformation of SL(2\,R). The growth of operator size (in particular\, i
ts finite temperature\, sub-maximal Lyapunov behavior) is governed by this
algebra. The deformed SL(2\,R) acts in a somewhat unusual manner on the b
ulk geometry.\n
LOCATION:https://researchseminars.org/talk/IASQubit2022/7/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ahmed Almheiri (New York University)
DTSTART:20221206T221500Z
DTEND:20221206T230000Z
DTSTAMP:20260422T212932Z
UID:IASQubit2022/8
DESCRIPTION:Title: Path Integrals for Chords\nby Ahmed Almheiri (New York University
) as part of Workshop on Spacetime and Quantum Information\n\nLecture held
in Wolfensohn Hall.\n\nAbstract\nI will describe work in progress proposi
ng and analyzing the bulk path integral of double scaled SYK in various ba
ses.\n
LOCATION:https://researchseminars.org/talk/IASQubit2022/8/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gustavo Joaquin Turiaci (Institute for Advanced Study)
DTSTART:20221207T140000Z
DTEND:20221207T144500Z
DTSTAMP:20260422T212932Z
UID:IASQubit2022/9
DESCRIPTION:Title: Black Hole Microstate Counting from Gravity\nby Gustavo Joaquin T
uriaci (Institute for Advanced Study) as part of Workshop on Spacetime and
Quantum Information\n\nLecture held in Wolfensohn Hall.\n\nAbstract\nFind
ing a gravitational description of black hole microstates is an important
problem in quantum gravity. In this talk we describe how to reproduce the
integer number of black hole microstates using the Gibbons-Hawking gravita
tional path integral. This is done for a specific class of supersymmetric
black holes in four dimensions arising from toroidal compactifications of
string theory: first by applying localization to the gravitational path in
tegral that computes the index (including a careful evaluation of one-loop
determinants)\, and second by comparing the index with the degeneracy.\n
LOCATION:https://researchseminars.org/talk/IASQubit2022/9/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Bill Fefferman (The University of Chicago)
DTSTART:20221207T144500Z
DTEND:20221207T153000Z
DTSTAMP:20260422T212932Z
UID:IASQubit2022/10
DESCRIPTION:Title: Quantum Pseudoentanglement\nby Bill Fefferman (The University of
Chicago) as part of Workshop on Spacetime and Quantum Information\n\nLect
ure held in Wolfensohn Hall.\n\nAbstract\nQuantum pseudorandom states are
efficiently preparable states that are indistinguishable from truly Haar r
andom states to an efficient observer. First defined by Ji\, Liu and Song\
, such states have found a wide variety of applications in areas such as q
uantum gravity and cryptography. A fundamental question is exactly how muc
h entanglement is required to create such states. Haar-random states\, as
well as t-designs for t ≥ 2\, exhibit near-maximal entanglement. Here we
provide the first construction of pseudorandom states with only polylogar
ithmic entanglement entropy across an equipartition of the qubits\, which
is the minimum possible. Our construction can be based on any one-way func
tion secure against quantum attack. We additionally show that the entangle
ment in our construction is fully “tunable”\, in the sense that one ca
n have pseudorandom states with entanglement Θ(f(n)) for any desired func
tion ω(log n) ≤ f(n) ≤ O(n). More fundamentally\, our work calls into
question to what extent entanglement is a “feelable” quantity of quan
tum systems. Inspired by recent work of Gheorghiu and Hoban\, we define a
new notion which we call “pseudoentanglement”\, which are ensembles of
efficiently constructable quantum states which hide their entanglement en
tropy. We show such states exist in the strongest form possible while simu
ltaneously being pseudorandom states. Based on joint work with Adam Boulan
d\, Soumik Ghosh\, Umesh Vazirani and Zixin Zhou.\n
LOCATION:https://researchseminars.org/talk/IASQubit2022/10/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Tamra Nebabu (Stanford University)
DTSTART:20221207T161500Z
DTEND:20221207T170000Z
DTSTAMP:20260422T212932Z
UID:IASQubit2022/11
DESCRIPTION:Title: A Generalized Protocol for Bulk Reconstruction from Generalized Free
Fields\nby Tamra Nebabu (Stanford University) as part of Workshop on
Spacetime and Quantum Information\n\nLecture held in Wolfensohn Hall.\n\nA
bstract\nBulk reconstruction is an important step in establishing the dict
ionary between boundary and bulk quantities in holographic theories. If th
e starting point is a quantum theory which serves as the putative boundary
model\, in what cases can one construct a bulk dual description? I will d
iscuss recent work in which we devise a generalized protocol for construct
ing a bulk theory from any boundary model of generalized free fields. Unli
ke HKLL reconstruction\, the bulk geometry and dynamics are fully emergent
. I will discuss the application of our protocol to construct bulk descrip
tions for various SYK models beyond the conformal limit in which they are
known to have a canonical dual. I will show evidence of that some geometri
c features of the canonical bulk survive in the non-conformal limit\, and
remark on the ability to extend the protocol to explore emergent bulk phys
ics in more general settings.\n
LOCATION:https://researchseminars.org/talk/IASQubit2022/11/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Scott Aaronson (University of Texas at Austin)
DTSTART:20221207T170000Z
DTEND:20221207T174500Z
DTSTAMP:20260422T212932Z
UID:IASQubit2022/12
DESCRIPTION:Title: Discrete Bulk Reconstruction\nby Scott Aaronson (University of T
exas at Austin) as part of Workshop on Spacetime and Quantum Information\n
\nLecture held in Wolfensohn Hall.\n\nAbstract\nAccording to the AdS/CFT c
orrespondence\, the geometries of certain spacetimes are fully determined
by quantum states that live on their boundaries -- indeed\, by the von Neu
mann entropies of portions of those boundary states. This work investigate
s to what extent the geometries can be reconstructed from the entropies in
polynomial time. Bouland\, Fefferman\, and Vazirani (2019) argued that th
e AdS/CFT map can be exponentially complex if one wants to reconstruct reg
ions such as the interiors of black holes. Our main result provides a sort
of converse: we show that\, in the special case of a single 1D boundary\,
if the input data consists of a list of entropies of contiguous boundary
regions\, and if the entropies satisfy a single inequality called Strong S
ubadditivity\, then we can construct a graph model for the bulk in linear
time. Moreover\, the bulk graph is planar\, it has O(N^2) vertices (the in
formation-theoretic minimum)\, and it's "universal\," with only the edge w
eights depending on the specific entropies in question. From a combinatori
al perspective\, our problem boils down to an "inverse" of the famous min-
cut problem: rather than being given a graph and asked to find a min-cut\,
here we're given the values of min-cuts separating various sets of vertic
es\, and need to find a weighted undirected graph consistent with those va
lues. Our solution to this problem relies on the notion of a "bulkless" gr
aph\, which might be of independent interest for AdS/CFT. We also make ini
tial progress on the case of multiple 1D boundaries -- where the boundarie
s could be connected wormholes -- including an upper bound of O(N^4) verti
ces whenever a planar bulk graph exists (thus putting the problem into the
complexity class NP).\n
LOCATION:https://researchseminars.org/talk/IASQubit2022/12/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ronak Soni (University of Cambridge)
DTSTART:20221207T190000Z
DTEND:20221207T194500Z
DTSTAMP:20260422T212932Z
UID:IASQubit2022/13
DESCRIPTION:Title: Microstates of the 2d Non-Supersymmetric Black Hole\nby Ronak So
ni (University of Cambridge) as part of Workshop on Spacetime and Quantum
Information\n\nLecture held in Wolfensohn Hall.\n\nAbstract\nWe identify t
he microstates of the non–supersymmetric\, asymptotically flat 2d black
hole in the dual c=1 matrix quantum mechanics (MQM). We calculate the part
ition function of the theory using Hamiltonian methods and reproduce one o
f two conflicting results found by Kazakov and Tseytlin. We find the entro
py by counting states and the energy by approximately solving the Schrödi
nger equation. The dominant contribution to the partition function in the
double-scaling limit is a novel bound state that can be considered an expl
icit dual of the black hole microstates. This bound state is long-lived an
d evaporates slowly\, exactly like a black hole in asymptotically flat spa
ce. Based on arXiv:2110.11493.\n
LOCATION:https://researchseminars.org/talk/IASQubit2022/13/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Geoff Penington (University of California\, Berkeley\; Institute f
or Advanced Study)
DTSTART:20221207T194500Z
DTEND:20221207T203000Z
DTSTAMP:20260422T212932Z
UID:IASQubit2022/14
DESCRIPTION:Title: The Boundary Algebras in JT Gravity\nby Geoff Penington (Univers
ity of California\, Berkeley\; Institute for Advanced Study) as part of Wo
rkshop on Spacetime and Quantum Information\n\nLecture held in Wolfensohn
Hall.\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/IASQubit2022/14/
END:VEVENT
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