<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<style type="text/css" style="display:none;"> P {margin-top:0;margin-bottom:0;} </style>
</head>
<body dir="ltr">
<div style="text-align: left; text-indent: 0px; background-color: rgb(255, 255, 255); margin: 0px; font-family: Calibri, Arial, Helvetica, sans-serif, serif, EmojiFont; font-size: 11pt; color: rgb(0, 0, 0);" class="elementToProof">
<span style="background-color: white;">Dear all, </span></div>
<div style="background-color: rgb(255, 255, 255); margin: 0px;">
<div style="background-color: rgb(255, 255, 255); margin: 0px;">
<div style="background-color: white; margin: 0px;">
<div style="text-align: left; text-indent: 0px; background-color: white; margin: 0px; font-family: Calibri, sans-serif, serif, EmojiFont; font-size: 11pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style="text-align: left; text-indent: 0px; margin: 0px; font-size: 11pt; color: rgb(0, 0, 0);">
<span style="font-family: Calibri, sans-serif, serif, EmojiFont; background-color: white;">Tomorrow, at 1pm
</span><span style="font-family: Calibri, sans-serif, serif, EmojiFont; background-color: rgb(255, 255, 255);">EDT</span><span style="font-family: Calibri, sans-serif, serif, EmojiFont; background-color: white;">, we will have a cake seminar given by
</span><span style="font-family: Calibri, Helvetica, sans-serif, serif, EmojiFont; background-color: rgb(255, 255, 255);">Enrique Rico</span><span style="font-family: Calibri, Arial, Helvetica, sans-serif, serif, EmojiFont; background-color: white;"> of
</span><span style="font-family: Calibri, Helvetica, sans-serif, serif, EmojiFont; background-color: rgb(255, 255, 255);">Bilbao University</span><span style="font-family: Calibri, sans-serif, serif, EmojiFont; background-color: white;"> in CC F224-225.
</span><span style="font-family: Calibri, Arial, Helvetica, sans-serif, serif, EmojiFont;">Please see below for the title and abstract. </span></div>
</div>
<div style="background-color: white; margin: 0px;">
<div style="text-align: left; text-indent: 0px; background-color: white; margin: 0px; font-family: Calibri, Arial, Helvetica, sans-serif, serif, EmojiFont; font-size: 11pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style="background-color: white; margin: 0px;">
<p style="text-align: left; text-indent: 0px; background-color: white; margin: 0px;">
<span style="font-family: Calibri, sans-serif, serif, EmojiFont; font-size: 11pt; color: rgb(0, 0, 0);"><b><u>Cake Seminar</u></b>:<b> </b></span><span style="font-family: Calibri, sans-serif, serif, EmojiFont; font-size: 11pt; color: rgb(0, 0, 0); background-color: white;">Wednesday,
</span><span style="font-family: Calibri, Arial, Helvetica, sans-serif, serif, EmojiFont; font-size: 14.6667px; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);">April 3</span><span style="font-family: Calibri, Arial, Helvetica, sans-serif, serif, EmojiFont; font-size: 11pt; color: rgb(0, 0, 0); background-color: white;"><sup>rd</sup></span><span style="font-family: Calibri, sans-serif, serif, EmojiFont; font-size: 11pt; color: rgb(0, 0, 0); background-color: white;">,
2024 at 1pm </span><span style="font-family: Calibri, sans-serif, serif, EmojiFont; font-size: 11pt; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);">EDT</span></p>
</div>
<div style="background-color: white; margin: 0px;">
<p style="text-align: left; text-indent: 0px; background-color: white; margin: 0px; font-family: Calibri, sans-serif; font-size: 10pt; color: rgb(36, 36, 36);">
<span style="font-size: 11pt; color: rgb(0, 0, 0);"><b><u><br>
</u></b></span></p>
<p style="text-align: left; text-indent: 0px; background-color: white; margin: 0px;">
<span style="font-family: Calibri, sans-serif, serif, EmojiFont; font-size: 11pt; color: rgb(0, 0, 0);"><b><u>Speaker</u></b>:
</span><span style="font-family: Calibri, Helvetica, sans-serif, serif, EmojiFont; font-size: 14.6667px; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);">Enrique Rico</span><span style="font-family: Calibri, sans-serif, serif, EmojiFont; font-size: 11pt; color: rgb(0, 0, 0);"> (</span><span style="font-family: Calibri, Helvetica, sans-serif, serif, EmojiFont; font-size: 14.6667px; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);">Bilbao
University</span><span style="font-family: Calibri, sans-serif, serif, EmojiFont; font-size: 11pt; color: rgb(0, 0, 0);">) </span></p>
<p style="text-align: left; text-indent: 0px; background-color: white; margin: 0px; font-family: Calibri, sans-serif; font-size: 10pt; color: rgb(36, 36, 36);">
<span style="font-size: 11pt; color: rgb(0, 0, 0);"><b><u><br>
</u></b></span></p>
<p style="text-align: left; text-indent: 0px; background-color: white; margin: 0px;">
<span style="font-family: Calibri, sans-serif, serif, EmojiFont; font-size: 11pt; color: rgb(0, 0, 0);"><b><u>Title</u></b>:<b> </b></span><span style="font-family: Calibri, Helvetica, sans-serif, serif, EmojiFont; font-size: 11pt; color: rgb(0, 0, 0);">Noise-aware
variational eigensolvers: a dissipative route for lattice gauge theories</span><span style="font-family: Calibri, Helvetica, sans-serif, serif, EmojiFont; font-size: 11pt; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);"> </span></p>
</div>
<div style="background-color: white; margin: 0px;">
<p style="text-align: left; text-indent: 0px; background-color: white; margin: 0px; font-family: Calibri, sans-serif; font-size: 11pt; color: rgb(36, 36, 36);">
<span style="color: rgb(0, 0, 0);"><b><u><br>
</u></b></span></p>
<div style="background-color: white; margin: 0px;">
<p style="text-align: left; text-indent: 0px; margin: 0px;"><span style="font-family: Calibri, sans-serif, serif, EmojiFont; font-size: 11pt; color: rgb(0, 0, 0);"><b><u>Abstract</u></b>:
</span><span style="font-family: Calibri, Helvetica, sans-serif, serif, EmojiFont; font-size: 11pt; color: rgb(0, 0, 0);">We propose a novel variational ansatz for the ground-state preparation of the ℤ2 lattice gauge theory (LGT) in quantum simulators. It combines
dissipative and unitary operations in a completely deterministic scheme with a circuit depth that does not scale with the size of the considered lattice. We find that, with very few variational parameters, the ansatz can achieve >99% precision in energy in
both the confined and deconfined phase of the ℤ2 LGT. We benchmark our proposal against the unitary Hamiltonian variational ansatz and find a clear advantage of our scheme, especially when focusing on the nature of the confinement-deconfinement transition
of the ℤ2 LGT. After performing a finite-size scaling analysis, we show that our dissipative variational ansatz can predict critical exponents with reasonable accuracies even for reduced qubit numbers and circuit depths. Furthermore, we investigate the performance
of this variational eigensolver subject to circuit-level noise, determining variational error thresholds that fix the error rate pℓ below which p<pℓ it would be beneficial to increase the number of layers ℓ↦ℓ′>ℓ. In light of these quantities and for typical
gate errors p in current quantum processors, we provide a detailed assessment of the prospects of our scheme to explore the ℤ2 LGT on near-term devices.</span><span style="font-family: Calibri, Helvetica, sans-serif, serif, EmojiFont; font-size: 11pt; color: rgb(66, 66, 66); background-color: rgb(255, 255, 255);"> </span></p>
<p style="text-align: left; text-indent: 0px; margin: 0px;"><span style="font-family: Calibri, sans-serif, serif, EmojiFont; font-size: 11pt; color: rgb(0, 0, 0);"><br>
</span></p>
<p style="text-align: left; text-indent: 0px; background-color: white; margin: 0px;">
<span style="font-family: Calibri, sans-serif, serif, EmojiFont; font-size: 11pt; color: rgb(0, 0, 0);"><br>
</span></p>
<p style="text-align: left; text-indent: 0px; background-color: white; margin: 0px;">
<span style="font-family: Calibri, sans-serif, serif, EmojiFont; font-size: 11pt; color: rgb(0, 0, 0);">Best regards, </span></p>
<p style="text-align: left; text-indent: 0px; background-color: white; margin: 0px;">
<span style="font-family: Calibri, sans-serif, serif, EmojiFont; font-size: 11pt; color: rgb(0, 0, 0);">Caroline, Joe, and Zheng-Yang</span></p>
</div>
</div>
</div>
</div>
</div>
<div style="text-align: left; text-indent: 0px; background-color: rgb(255, 255, 255); margin: 0px; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">
<br>
</div>
</body>
</html>