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Dear All,</div>
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We have a seminar this week. The details are provided below - </div>
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Kind regards, </div>
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Elisa</div>
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<span style="font-size: 15px;"><b>Speaker:</b> </span><span style="font-size: 11pt;"><b>Adam Gammon-Smith</b></span></div>
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<b>Seminar date:</b> September 30th <b>, Tuesday, 1 pm </b>UK time</div>
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<b>Venue:</b> Seminar Room <b>A 113 (Cripps North Building, CAPT)</b></div>
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<span style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: black;"><b>Title:
</b></span><span style="font-family: "Segoe UI", "Segoe UI Web (West European)", -apple-system, "system-ui", Roboto, "Helvetica Neue", sans-serif; font-size: 15px; color: black;"><b><i>Visualizing dynamics of charges and strings in (2 + 1)D lattice gauge theories
on a quantum computer</i></b></span></p>
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<span style="font-family: "Segoe UI", "Segoe UI Web (West European)", -apple-system, "system-ui", Roboto, "Helvetica Neue", sans-serif; font-size: 15px; color: black;"><b><i><br>
</i></b></span></p>
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<span style="font-family: "Segoe UI", "Segoe UI Web (West European)", -apple-system, "system-ui", Roboto, "Helvetica Neue", sans-serif; font-size: 15px; color: black;"><b>Abstract:
</b></span><span style="font-family: "Segoe UI", "Segoe UI Web (West European)", -apple-system, "system-ui", Roboto, "Helvetica Neue", sans-serif; font-size: 15px; color: rgb(36, 36, 36);">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.</span></p>
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Reference:</div>
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Nature 642, 315–320 (2025)</div>
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<b>Link to join:</b></div>
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<a style="margin: 0px;" data-auth="NotApplicable" data-linkindex="0" rel="noopener noreferrer" title="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" class="OWAAutoLink" id="OWAee703839-5ab3-fdeb-08a3-6b18e4ad3d00" target="_blank" href="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">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</a></div>
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<b><i><u>List of upcoming Seminars:</u></i></b></div>
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<b><i><u><br>
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Oct 7th: William Giarè (Sheffield)</div>
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Oct 14th: William Coulton (Cambridge)</div>
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Oct 21st: Fiona McCarthy (Cambridge)</div>
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Oct 28th: Jack Shergold (Liverpool)</div>
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Nov 4th: Usama Aqeel (Nottingham)</div>
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Nov 18th: Benjamin Muntz (Nottingham)</div>
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Nov 25th: Fraser Cowie (Oxford)</div>
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Dec 2nd: Violetta Sagun (Southampton)</div>
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Dec 9th: James Alvey (Cambridge)</div>
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