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BEGIN:VEVENT
SUMMARY:Harpreet Arora (Caltech)
DTSTART:20200529T180000Z
DTEND:20200529T190000Z
DTSTAMP:20260404T094652Z
UID:IQIM-seminar/1
DESCRIPTION:Title: Investigating superconductivity in Twisted Bilayer Graphene (T
BG)\nby Harpreet Arora (Caltech) as part of IQIM Seminar Series\n\n\nA
bstract\nWhile graphene has been dubbed as a ‘wonder material' because o
f amazing characteristics such as the ability to conduct electricity bette
r than copper and being two hundred times stronger than steel\, until rece
ntly\, the key quantum phenomenon of superconductivity was missing from th
e list of properties exhibited by graphene. In 2018\, an astonishing disco
very showed that by placing two sheets of graphene on top of each other wh
ich are rotationally misaligned by a small angle - in a structure known as
Twisted Bilayer Graphene (TBG)\, it is possible to realize superconductiv
ity when the rotation angle is close to the ‘Magic Angle' value of 1.1 d
egrees$^{[1]}$. More surprisingly\, superconductivity in the initial repor
ts was observed in close proximity to insulating states - resembling the p
hase diagram of High Tc superconductors. This sparked a fierce debate abou
t its origin and its possible relation to High Tc superconductors. In this
talk\, I will show that by carefully engineering the dielectric environme
nt of TBG\, it is possible to stabilize superconductivity in non-magic ang
le TBG devices without the presence of any insulating states$^{[2]}$. This
discovery imposes severe constraints on the origin of superconductivity i
n TBG. I will also discuss measurements providing direct evidence of spin-
orbit coupling induced in TBG for the first time. I will conclude by talki
ng about possible experiments that will shed more light on the nature of s
uperconductivity in TBG.\n\n\n[1] Cao et al. "Unconventional superconducti
vity in magic-angle graphene superlattices." Nature 556\, 43–50 (2018).\
n\n \n[2] Arora et al. "Superconductivity in metallic twisted bilayer grap
hene stabilized by WSe2" Nature (2020) In press. Preprint available at htt
ps://arxiv.org/abs/2002.03003\n
LOCATION:https://stable.researchseminars.org/talk/IQIM-seminar/1/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Eugene Tang (Caltech)
DTSTART:20200605T180000Z
DTEND:20200605T190000Z
DTSTAMP:20260404T094652Z
UID:IQIM-seminar/2
DESCRIPTION:Title: The ghost in the radiation: Robust encodings of the black hole
interior\nby Eugene Tang (Caltech) as part of IQIM Seminar Series\n\n
\nAbstract\nWe reconsider the black hole firewall puzzle\, emphasizing tha
t quantum error-correction\, computational complexity\, and pseudorandomne
ss are crucial concepts for understanding the black hole interior. We assu
me that the Hawking radiation emitted by an old black hole is pseudorandom
\, meaning that it cannot be distinguished from a perfectly thermal state
by any efficient quantum computation acting on the radiation alone. We the
n infer the existence of a subspace of the radiation system which we inter
pret as an encoding of the black hole interior. This encoded interior is e
ntangled with the late outgoing Hawking quanta emitted by the old black ho
le\, and is inaccessible to computationally bounded observers who are outs
ide the black hole. Specifically\, efficient operations acting on the radi
ation\, those with quantum computational complexity polynomial in the entr
opy of the remaining black hole\, commute with a complete set of logical o
perators acting on the encoded interior\, up to corrections which are expo
nentially small in the entropy. Thus\, under our pseudorandomness assumpti
on\, the black hole interior is well protected from exterior observers as
long as the remaining black hole is macroscopic.\n\nThe talk will be an in
troductory version of my joint work with Isaac Kim and John Preskill\, ava
ilable at arxiv:2003.05451.\n
LOCATION:https://stable.researchseminars.org/talk/IQIM-seminar/2/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Christina Knapp (Caltech)
DTSTART:20200619T180000Z
DTEND:20200619T190000Z
DTSTAMP:20260404T094652Z
UID:IQIM-seminar/4
DESCRIPTION:Title: Time-reversal-invariant topological superconductors and the fr
actional Josephson effect\nby Christina Knapp (Caltech) as part of IQI
M Seminar Series\n\n\nAbstract\nTime-reversal-invariant topological superc
onductor (TRITOPS) wires host Majorana-zero-mode Kramers pairs that have b
een predicted to mediate a fractional Josephson effect. We explore the fa
te of the TRITOPS fractional Josephson effect in the presence of local tim
e-dependent perturbations that instantaneously preserve time-reversal symm
etry. This talk will review why Majorana zero modes have attracted intens
e interest in both the condensed matter and quantum computing communities.
We will then focus on the Majorana-zero-mode Kramers pairs appearing in
TRITOPS wires. We consider a Josephson junction between two TRITOPS wires
and demonstrate that the existence of a symmetry-protected ground state d
egeneracy does not result in a robust adiabatic cycle.\n
LOCATION:https://stable.researchseminars.org/talk/IQIM-seminar/4/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sepehr Ghazi Nezami (Caltech)
DTSTART:20200409T190000Z
DTEND:20200409T200000Z
DTSTAMP:20260404T094652Z
UID:IQIM-seminar/5
DESCRIPTION:Title: Teleportation by size\, traversable wormholes\, and quantum gr
avity in the lab\nby Sepehr Ghazi Nezami (Caltech) as part of IQIM Sem
inar Series\n\n\nAbstract\nWith the long-term goal of studying quantum gra
vity in the lab\, we propose holographic teleportation protocols that can
be readily executed in table-top experiments. These protocols exhibit simi
lar behavior to that seen in recent traversable wormhole constructions: in
formation that is scrambled into one half of an entangled system will\, fo
llowing a weak coupling between the two halves\, unscramble into the other
half. We introduce the concept of "teleportation by size" to capture how
the physics of operator-size growth naturally leads to information transmi
ssion. The transmission of a signal through a semi-classical holographic w
ormhole corresponds to a rather special property of the operator-size dist
ribution we call "size winding". For more general setups (which may not ha
ve a clean emergent geometry)\, we argue that imperfect size winding is a
generalization of the traversable wormhole phenomenon. For example\, a for
m of signalling continues to function at high temperature and at large tim
es for generic chaotic systems\, even though it does not correspond to a s
ignal going through a geometrical wormhole\, but rather to an interference
effect involving macroscopically different emergent geometries. Finally\,
we outline implementations feasible with current technology in two experi
mental platforms: Rydberg atom arrays and trapped ions.\n
LOCATION:https://stable.researchseminars.org/talk/IQIM-seminar/5/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hsin-Yuan (Robert) Huang (Caltech)
DTSTART:20200417T180000Z
DTEND:20200417T190000Z
DTSTAMP:20260404T094652Z
UID:IQIM-seminar/6
DESCRIPTION:Title: Predicting Many Properties of a Quantum System from Very Few M
easurements\nby Hsin-Yuan (Robert) Huang (Caltech) as part of IQIM Sem
inar Series\n\n\nAbstract\nPredicting properties of complex\, large-scale
quantum systems is essential for developing quantum technologies. We prese
nt an efficient method for constructing an approximate classical descripti
on of a quantum state using very few measurements of the state. This descr
iption\, called a classical shadow\, can be used to predict many different
properties: order log(M) measurements suffice to accurately predict M dif
ferent functions of the state with high success probability. The number of
measurements is independent of the system size and saturates information-
theoretic lower bounds. Moreover\, target properties to predict can be sel
ected after the measurements are completed. We support our theoretical fin
dings with extensive numerical experiments. We apply classical shadows to
predict quantum fidelities\, entanglement entropies\, two-point correlatio
n functions\, expectation values of local observables\, and the energy var
iance of many-body local Hamiltonians. The numerical results highlight the
advantages of classical shadows relative to previously known methods.\n
LOCATION:https://stable.researchseminars.org/talk/IQIM-seminar/6/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ding Zhong (Caltech)
DTSTART:20200424T180000Z
DTEND:20200424T190000Z
DTSTAMP:20260404T094652Z
UID:IQIM-seminar/7
DESCRIPTION:Title: Harvesting proximity effect in 2D Ferromagnetic Semiconductor
Heterostructures for Spin and Valleytronics\nby Ding Zhong (Caltech) a
s part of IQIM Seminar Series\n\n\nAbstract\nMonolayer transition metal di
chalcogenides host easily accessible spin and valley degrees of freedom th
at can be used to encode and process information. With the advent of van d
er Waals heterostructures\, there are new opportunities to engineer spin a
nd valleytronic devices with more advanced functionalities. In this talk\,
I will describe a van der Waals heterostructure composed of a monolayer s
emiconductor\, WSe2\, and an ultrathin layered ferromagnetic semiconductor
\, CrI3. The integration of the two materials enables a strong magnetic pr
oximity effect in WSe2 and spin-selective charge transfer from WSe2 to CrI
3. By controlling the individual layer magnetization in CrI3 with a magnet
ic field\, we show that the spin-dependent charge transfer between WSe2 an
d CrI3 is dominated by the interfacial CrI3 layer\, while the proximity ex
change field is highly sensitive to the layered magnetic structure as a wh
ole. These properties allow us to achieve unprecedented control of WSe2 va
lley properties in these devices. Moreover\, the photoluminescence detecti
on of WSe2 valley pseudospin provides us with a simple yet powerful tool t
o probe the layer-resolved magnetization dynamics in CrI3.\n
LOCATION:https://stable.researchseminars.org/talk/IQIM-seminar/7/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ash Milsted (Caltech)
DTSTART:20200508T180000Z
DTEND:20200508T190000Z
DTSTAMP:20260404T094652Z
UID:IQIM-seminar/8
DESCRIPTION:Title: Simulating the collapse of false-vacuum bubbles in spin chains
\nby Ash Milsted (Caltech) as part of IQIM Seminar Series\n\n\nAbstrac
t\nIt is possible that we live close to a local energetic minimum of the S
tandard Model\, with an ever-present chance of catastrophic decay to the t
rue minimum. We study the real-time collapse of a small bubble of false va
cuum\, on a true-vacuum background\, in the vastly simpler setting of 1+1-
dimensional spin chains\, which nevertheless can capture key aspects if th
e physics involved. We construct spatially localized false-vacuum bubbles
using an infinite Matrix Product State ansatz and simulate their time evol
ution\, demonstrating inelastic scattering when the walls of the bubbles c
ollide in an Ising-like chain. In contrast\, the simplest candidate model
-- the unmodified transverse-field Ising model with a small longitudinal f
ield -- is seen to exhibit only elastic scattering\, so that false-vacuum
bubbles merely bounce back after collapsing.\n
LOCATION:https://stable.researchseminars.org/talk/IQIM-seminar/8/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Wilbur Shirley (Caltech)
DTSTART:20200515T180000Z
DTEND:20200515T190000Z
DTSTAMP:20260404T094652Z
UID:IQIM-seminar/9
DESCRIPTION:Title: Fractonic order\nby Wilbur Shirley (Caltech) as part of IQ
IM Seminar Series\n\n\nAbstract\nIn recent years\, a theoretical new class
of three-dimensional gapped phases of quantum matter has risen to the for
e. These phases\, originally discovered in the search for a self-correctin
g quantum memory\, are said to exhibit fractonic order --- a novel form of
long-range entanglement similar to intrinsic topological order\, but dist
inct from it due to a striking dependence of the universal properties of a
phase on lattice geometry. This dependence manifests in a number of exoti
c features including fractional excitations with constrained mobility\, un
usually slow thermalization dynamics\, and ground state degeneracy that gr
ows with system size. In this talk\, I will give an introduction to the to
pic\, and describe recent progress towards a systematic understanding of t
hese phases in terms of emergent gauge theory and entanglement renormaliza
tion group flow.\n
LOCATION:https://stable.researchseminars.org/talk/IQIM-seminar/9/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Junyu Liu (Caltech)
DTSTART:20201009T180000Z
DTEND:20201009T190000Z
DTSTAMP:20260404T094652Z
UID:IQIM-seminar/10
DESCRIPTION:Title: Quantum computation and “cyberpunkian” quantum field theo
ry\nby Junyu Liu (Caltech) as part of IQIM Seminar Series\n\n\nAbstrac
t\nQuantum field theory is one of the greatest achievements by human being
s in understanding the law of the universe. Almost all subjects in modern
physics\, from condensed-matter physics to string theory\, are closely rel
ated to the developments of quantum field theory. However\, Established in
the infinite-dimensional Hilbert spaces\, quantum field theory is very ha
rd to study\, especially when the theory is strongly coupled.\n\nThis talk
is a summary of quantum opportunities for solving quantum field theory th
eoretically and numerically\, based on a series of works by the speaker an
d collaborators. Specifically\, we describe a digital quantum simulation a
lgorithm for simulating domain wall scatterings in the 1+1 dimensional qua
ntum field theory\, which could be regarded as a toy version of cosmologic
al false vacuum decay in the real universe\, as an example. We will discus
s some potential fundamental limitations of classical algorithms\, how qua
ntum computers will help us solve the problem\, and how good quantum compu
ters are (the quantum-extended Church-Turing Thesis). Moreover\, we will d
iscuss some great classical algorithms developed in recent years. Namely\,
matrix product states in quantum many-body systems (tensor networks) and
semidefinite programming in conformal field theories (the conformal bootst
rap).\n
LOCATION:https://stable.researchseminars.org/talk/IQIM-seminar/10/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Yingfei Gu (Caltech)
DTSTART:20201016T180000Z
DTEND:20201016T190000Z
DTSTAMP:20260404T094652Z
UID:IQIM-seminar/11
DESCRIPTION:Title: Scrambling and Branching\nby Yingfei Gu (Caltech) as part
of IQIM Seminar Series\n\n\nAbstract\nOut-of-time-order correlators (OTOC
s) describe quantum chaos in a way comparable to classical chaos\, at leas
t for systems with a large parameter N\, where the early-time OTOCs are ch
aracterized by a Lyapunov exponent\, whose inverse defines a time scale kn
own as Lyapunov time. In this talk\, I will discuss another time scale cal
led branching time and derive a bound on it for SYK-like models. It turns
out that the branching time plays significantly different roles in the str
ong and weak coupling limits\, suggesting two different mechanisms for scr
ambling. This talk is based on [1812.00120] with Alexei Kitaev and work in
progress with Alexei Kitaev and Pengfei Zhang.\n
LOCATION:https://stable.researchseminars.org/talk/IQIM-seminar/11/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Cyprian Lewandowski (Caltech)
DTSTART:20201023T180000Z
DTEND:20201023T190000Z
DTSTAMP:20260404T094652Z
UID:IQIM-seminar/12
DESCRIPTION:Title: Pairing in magic-angle twisted bilayer graphene: role of phon
on and plasmon umklapp\nby Cyprian Lewandowski (Caltech) as part of IQ
IM Seminar Series\n\n\nAbstract\nIdentifying the microscopic mechanism for
superconductivity in magic-angle twisted bilayer graphene (MATBG) is an o
utstanding open problem. While MATBG exhibits a rich phase-diagram\, drive
n partly by the strong interactions relative to the electronic bandwidth\,
its single-particle properties are unique and likely play an important ro
le in some of the phenomenological complexity. Some of the salient feature
s include an electronic bandwidth smaller than the characteristic phonon b
andwidth and a non-trivial structure of the underlying Bloch wavefunctions
. In this talk\, I will discuss a theoretical study of the cooperative eff
ects due to phonons and plasmons on pairing in order to disentangle the di
stinct role played by these modes on superconductivity. We will consider a
variant of MATBG with an enlarged number of fermion flavors\, N≫1\, whe
re the study of pairing instabilities reduces to the conventional (weak-co
upling) Eliashberg framework. In particular\, I will show that certain umk
lapp processes involving mini-optical phonon modes\, which arise physicall
y as a result of the folding of the original acoustic branch of graphene d
ue to the moiré superlattice structure\, contribute significantly towards
enhancing pairing. Time permitting\, I will also consider the role played
by the dynamics of the screened Coulomb interaction on pairing\, which le
ads to an enhancement in a narrow window of fillings\, and study the effec
t of external screening due to a metallic gate on superconductivity. Final
ly\, I will propose a smoking-gun experiment to detect resonant features a
ssociated with the phonon-umklapp processes in the differential conductanc
e and also discuss several experimental implications of a pairing mechanis
ms relying on plasmons.\n\nThe talk will follow a joint work with Debanjan
Chowdhury and Jonathan Ruhman\, available at arXiv:2007.15002\n
LOCATION:https://stable.researchseminars.org/talk/IQIM-seminar/12/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Yuan Su (Caltech)
DTSTART:20201030T180000Z
DTEND:20201030T190000Z
DTSTAMP:20260404T094652Z
UID:IQIM-seminar/13
DESCRIPTION:Title: A Theory of Trotter Error\nby Yuan Su (Caltech) as part o
f IQIM Seminar Series\n\n\nAbstract\nWe develop a theory of Trotter error
that overcomes the limitations of prior approaches based on truncating the
Baker-Campbell-Hausdorff expansion. Our analysis directly exploits the co
mmutativity of operator summands\, producing tighter error bounds for both
real- and imaginary-time evolutions. Whereas previous work achieves simil
ar goals for systems with Lie-algebraic structure or certain low-order for
mulas\, our approach holds in general.\nWe give a host of improved algorit
hms for digital quantum simulation and quantum Monte Carlo methods\, inclu
ding simulations of nearest-neighbor lattice Hamiltonians\, second-quantiz
ed plane-wave electronic structure\, $k$-local Hamiltonians\, rapidly deca
ying power-law interactions\, clustered Hamiltonians\, the transverse fiel
d Ising model\, and quantum ferromagnets\, nearly matching or even outperf
orming the best previous results.\nWe obtain further speedups using the fa
ct that product formulas can preserve the locality of the simulated system
. Specifically\, we show that local observables can be simulated with comp
lexity independent of the system size for power-law interacting systems\,
which implies a Lieb-Robinson bound as a byproduct.\nOur analysis reproduc
es known tight bounds for first- and second-order formulas. Our higher-ord
er bound overestimates the complexity of simulating a one-dimensional Heis
enberg model with an even-odd ordering of terms by only a factor of 5\, an
d is close to tight for power-law interactions and other orderings of term
s. This suggests that our theory can accurately characterize Trotter error
in terms of both asymptotic scaling and constant prefactor.\n\nBased on a
rXiv:1901.00564 and arXiv:1912.08854.\n
LOCATION:https://stable.researchseminars.org/talk/IQIM-seminar/13/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Chaitali Joshi (Caltech)
DTSTART:20201106T190000Z
DTEND:20201106T200000Z
DTSTAMP:20260404T094652Z
UID:IQIM-seminar/14
DESCRIPTION:Title: Quantum photonics with color qubits\nby Chaitali Joshi (C
altech) as part of IQIM Seminar Series\n\n\nAbstract\nOptical photons are
excellent flying qubits for long-distance quantum networks due to negligib
le thermal noise and decoherence at room temperature. In this talk\, I wil
l discuss how frequency encoding can be combined with nonlinear optics and
fiber and integrated photonic technologies to address challenges in scali
ng future photonic quantum networks. Frequency multiplexing has had a prof
ound impact on classical telecommunication networks\, creating low loss an
d inexpensive hardware that can be exploited for quantum applications. I w
ill describe quantum photonic applications where frequency encoding provid
es a distinct advantage in terms of scaling losses and resource overhead c
ompared to polarization\, spatial or temporal mode encoding. \n\nCoherent
manipulation of light in the frequency domain at the single-photon level r
equires a strong\, noise-free nonlinear process. I will discuss our implem
entation of four-wave mixing (FWM) in a commercial dispersion-shifted fibe
r to achieve quantum frequency conversion with near-unity efficiency and l
ow noise. I will discuss how we used this process as an active "frequency
switch" to realize a low-loss multiplexed single-photon source that can be
scaled to the deterministic regime. Next\, I will discuss how we used thi
s process as a frequency beam-splitter to demonstrate two-photon Hong-Ou-M
andel type interference between entangled photons of different colors- a h
allmark of quantum indistinguishability. Finally\, I will discuss our real
ization of a FWM-based "time lens" for the generation and detection of sin
gle-photon waveforms with picosecond resolution. \n\nBased on Joshi et al
.\, Nat. Comm. 9\, 847 (2018)\, Joshi et al. Phys. Rev. Lett. 124\, 143601
(2020)\n
LOCATION:https://stable.researchseminars.org/talk/IQIM-seminar/14/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Chi Fang (Anthony) Chen (Caltech)
DTSTART:20201113T190000Z
DTEND:20201113T200000Z
DTSTAMP:20260404T094652Z
UID:IQIM-seminar/15
DESCRIPTION:Title: Hierarchy of light cones in power-law interacting systems: re
view of recent bounds and saturating protocols\nby Chi Fang (Anthony)
Chen (Caltech) as part of IQIM Seminar Series\n\n\nAbstract\nIn quantum ma
ny-body systems with local interactions\, quantum information and entangle
ment cannot spread outside of a linear light cone\, which expands at an em
ergent velocity analogous to the speed of light. Though\, realistic system
s often have a power-law interaction $1/r^α$. In this talk\, we discuss a
hierarchy of light cones in these long-ranged systems: At the same α\, s
ome quantum information processing tasks are constrained by a `linear’ l
ight cone\, while others are not. In one spatial dimension\, a linear ligh
t cone exists for every many-body state when α > 3 (Lieb-Robinson light c
one)\; for a typical state chosen uniformly at random when α > 5/2 (Frobe
nius light cone)\; and for every state of a noninteracting system when α
> 2 (free light cone). These bounds apply to time-dependent systems and ar
e saturated by explicit protocols. Some of these linear light cones extend
to algebraic ones and/or generalize to higher dimensions. As an example
among the various implications\, universal quantum state transfer\, as wel
l as many-body quantum chaos\, is bounded by the Frobenius light cone and\
, therefore\, is poorly constrained by all Lieb-Robinson bounds. This talk
will be an up-to-date review over regimes of α\, recent protocols and th
e key physical intuitions and the high-level proof ideas.\n
LOCATION:https://stable.researchseminars.org/talk/IQIM-seminar/15/
END:VEVENT
BEGIN:VEVENT
SUMMARY:TBA
DTSTART:20201120T190000Z
DTEND:20201120T200000Z
DTSTAMP:20260404T094652Z
UID:IQIM-seminar/16
DESCRIPTION:by TBA as part of IQIM Seminar Series\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/IQIM-seminar/16/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Xin Xie (Caltech)
DTSTART:20201204T190000Z
DTEND:20201204T200000Z
DTSTAMP:20260404T094652Z
UID:IQIM-seminar/17
DESCRIPTION:Title: Precise Calibrations of Few-Body Physics in Potassium-39\
nby Xin Xie (Caltech) as part of IQIM Seminar Series\n\n\nAbstract\nWe per
form precise studies of two-and three-body interactions near an intermedia
te-strength Feshbach resonance in potassium-39 at 33.5820(14) G. Precise m
easurement of dimer binding energies enables the construction of a complet
e two-body coupled-channel model for determination of the scattering lengt
hs with an unprecedented low uncertainty. Utilizing such an accurate scatt
ering length map\, we unambiguously locate four distinct features in the E
fimov three-body structure. Meticulous characterization of and correction
for finite temperature effects ensure high accuracy on the measurements of
these features at large-magnitude scattering lengths. We report the groun
d Efimov resonance location to be at −14.05(17) times the van der Waals
length r_vdW\, significantly deviating from the value of −9.7r_vdW predi
cted by van der Waals universality [1]. While three of these features form
ratios that obey the Efimov universal scaling to within 10% [2].\n\n[1] h
ttps://journals.aps.org/prl/abstract/10.1103/PhysRevLett.123.233402\n[2] h
ttps://journals.aps.org/prl/accepted/94071Yb5H8819f8421972b1289f4d229daf32
da51\n
LOCATION:https://stable.researchseminars.org/talk/IQIM-seminar/17/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Natalie Klo (Caltech)
DTSTART:20201218T190000Z
DTEND:20201218T200000Z
DTSTAMP:20260404T094652Z
UID:IQIM-seminar/19
DESCRIPTION:Title: Post-Anthropocene Computation: Rewilding the Quantum Field\nby Natalie Klo (Caltech) as part of IQIM Seminar Series\n\n\nAbstract\n
Whether interested in simulating dynamical interactions of fundamental par
ticles or otherwise implementing a large-scale quantum computation\, the f
ield theoretic framework of spatially distributed quantum degrees of freed
om is invaluable. By leveraging their natural capacity to describe highly
entangled many-body states\, the use of atomic-scale quantum systems to fo
rm a computational framework for the exploration of sub-atomic phenomena i
s envisioned to be non-perturbatively advantageous. In this talk\, I will
share a developing perspective on the entanglement structures within quant
um fields and discuss resulting implications for the design of effective f
ield theories and future practical quantum simulations of quantum fields.\
n
LOCATION:https://stable.researchseminars.org/talk/IQIM-seminar/19/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Harry Levine (Harvard)
DTSTART:20201028T180000Z
DTEND:20201028T190000Z
DTSTAMP:20260404T094652Z
UID:IQIM-seminar/20
DESCRIPTION:Title: Quantum simulation and quantum computation with programmable
Rydberg atom arrays\nby Harry Levine (Harvard) as part of IQIM Seminar
Series\n\n\nAbstract\nNeutral atom arrays form a powerful platform for st
udying and coherently controlling many-body quantum systems. These arrays
can be readily scaled to hundreds of individually controlled atoms with fl
exible\, programmable geometries. Strong atomic interactions can be introd
uced by coherent excitation to Rydberg states\, resulting in a rich spin H
amiltonian with variable interaction range\, as well as tools for quantum
information processing. In this talk\, I will discuss two applications of
coherent control over 1D atom arrays to create and benchmark entangled sta
tes. In the first\, we utilize the Rydberg Hamiltonian to globally drive a
20 atom array into a fully entangled Schrödinger cat state. In the secon
d\, we introduce a new protocol for a universal two-qubit gate on neutral
atoms\, and demonstrate its parallel implementation on several pairs of qu
bits. Finally\, I will discuss our ongoing work scaling our system to 2D a
rrays of hundreds of qubits\, including preliminary results exploring the
phase diagram of 2D arrays as well as applications to graph theory optimiz
ation problems.\n
LOCATION:https://stable.researchseminars.org/talk/IQIM-seminar/20/
END:VEVENT
BEGIN:VEVENT
SUMMARY:TBA
DTSTART:20210108T190000Z
DTEND:20210108T200000Z
DTSTAMP:20260404T094652Z
UID:IQIM-seminar/21
DESCRIPTION:by TBA as part of IQIM Seminar Series\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/IQIM-seminar/21/
END:VEVENT
END:VCALENDAR