BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//CERN//INDICO//EN
BEGIN:VEVENT
SUMMARY:[Hybrid RBRC seminar] From topological theta vacua to asymptotic f
reedom: Qubit models\, sign problems\, and anomalies
DTSTART;VALUE=DATE-TIME:20221208T173000Z
DTEND;VALUE=DATE-TIME:20221208T183000Z
DTSTAMP;VALUE=DATE-TIME:20230128T092200Z
UID:indico-event-17448@indico.bnl.gov
CONTACT:nmatsumot@bnl.gov
DESCRIPTION:Speakers: Hersh Singh (University of Washington)\n\nThe strong
interactions of the standard model described by quantum chromodynamics (Q
CD) pose a challenging problem for classical computation. Emerging quantum
platforms provide an exciting possibility for investigating QFTs in previ
ously inaccessible regimes. This has motivated a search for unconventional
formulations of QFTs with finite-dimensional local Hilbert spaces\, or wi
th “qubit” degrees of freedom. In this talk\, I will describe recent w
ork in constructing qubit models for asymptotically-free 1+1d nonlinear
sigma models\, which are well-known prototypes of QCD. In particular\, con
ventional lattice formulations of topological θ vacua in the 2d O(3) nonl
inear sigma model suffer from a severe sign problem on classical computers
. Remarkably\, by formulating this as model of qubits\, not only do we ob
tain a viable path towards its quantum simulation\, but we also obtain the
first sign-problem-free regularization for arbitrary θ\, solving a longs
tanding sign problem. We show that such models can reproduce both the IR p
hysics of theta vacua and the UV physics of asymptotic freedom. In the sea
rch for new qubit models in higher dimensions and for gauge theories\, s
ymmetries and anomalies are a guide. We will discuss how the perspective o
f recently discovered discrete anomalies provides interesting constraints
on possible lattice regularizations towards the goal of finding such qubi
t models for QCD-like theories.\n\nhttps://indico.bnl.gov/event/17448/
LOCATION:2-160 (https://bnl.zoomgov.com/j/1606067399?pwd=am02b0xIUXZ6TDR3d
1dWL05TTDdaUT09)
URL:https://indico.bnl.gov/event/17448/
END:VEVENT
END:VCALENDAR