[Astro] [CAPT] Particle Cosmology and Gravity Seminar this week: Adam Gammon-Smith

[Elisa Todarello (staff)]

Dear All,

                  We have a seminar this week. The details are provided below -

Kind regards,
Elisa
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Speaker: Adam Gammon-Smith

Seminar date: September 30th , Tuesday, 1 pm UK time

Venue: Seminar Room A 113 (Cripps North Building, CAPT)


Title: Visualizing dynamics of charges and strings in (2 + 1)D lattice gauge theories on a quantum computer


Abstract: Lattice gauge theories (LGTs), are a powerful tool for understanding phenomena from high-energy physics to many-body interactions in materials. However, studying their dynamics is computationally challenging and often beyond the reach of classical methods. In this work, we investigate the dynamics of local excitations in a Z2 LGT using a two-dimensional lattice of superconducting qubits. We begin by using a variational circuit to prepare a low-energy state. We then create charge excitations with local gates and simulate their quantum dynamics through a discretized time evolution. Our measurements reveal clear signatures of a transition from deconfined to confined dynamics as we increase the electric field coupling. In the confined phase, the electric field induces a tension in the string connecting the excitations. Our method allows us to experimentally image these string dynamics in a (2+1)D LGT for the first time. From this, we uncover two distinct regimes inside the confining phase: For weak confinement, the string fluctuates strongly in the transverse direction. For strong confinement, these transverse fluctuations are effectively frozen. We also demonstrate a resonance condition that facilitates dynamical string breaking. Overall, our implementation of an LGT on a quantum processor introduces a new set of techniques for investigating emergent excitations and their complex string dynamics.

Reference:
Nature 642, 315–320 (2025)


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Link to join:

 https://teams.microsoft.com/l/meetup-join/19%3ameeting_OGM3OTk5NzQtZWEwZS00ZmUyLTk3MGUtZjFhY2M5OTU2MjI1%40thread.v2/0?context=%7b%22Tid%22%3a%2267bda7ee-fd80-41ef-ac91-358418290a1e%22%2c%22Oid%22%3a%22f3250584-4b5f-48fa-a897-08e77f2246b7%22%7d


List of upcoming Seminars:

Oct 7th: William Giarè (Sheffield)
Oct 14th: William Coulton (Cambridge)
Oct 21st: Fiona McCarthy (Cambridge)
Oct 28th: Jack Shergold (Liverpool)
Nov 4th: Usama Aqeel (Nottingham)
Nov 18th: Benjamin Muntz (Nottingham)
Nov 25th: Fraser Cowie (Oxford)
Dec 2nd: Violetta Sagun (Southampton)
Dec 9th: James Alvey (Cambridge)









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