<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><p class="MsoNormal" style="-webkit-text-size-adjust: auto; margin: 0in; font-size: 10pt; font-family: Calibri, sans-serif;"><b><span style="font-size: 14pt; font-family: Helvetica;">Ray Li</span></b><o:p></o:p></p><p class="MsoNormal" style="-webkit-text-size-adjust: auto; margin: 0in; font-size: 10pt; font-family: Calibri, sans-serif;"><b><span style="font-size: 14pt; font-family: Helvetica;">University of Santa Clara</span></b><o:p></o:p></p><p class="MsoNormal" style="-webkit-text-size-adjust: auto; margin: 0in; font-size: 10pt; font-family: Calibri, sans-serif;"> <o:p></o:p></p><p class="MsoNormal" style="-webkit-text-size-adjust: auto; margin: 0in; font-size: 10pt; font-family: Calibri, sans-serif;"><span style="font-size: 11pt;"> </span><img width="255" height="292" id="Picture_x0020_1" src="cid:49F14420-595C-4EB1-B207-53BC25806C35" alt="image001.jpg" style="width: 2.6562in; height: 3.0416in;"><o:p></o:p></p><p class="MsoNormal" style="-webkit-text-size-adjust: auto; margin: 0in; font-size: 10pt; font-family: Calibri, sans-serif;"><span style="font-size: 11pt;"> </span> <o:p></o:p></p><p class="MsoNormal" style="-webkit-text-size-adjust: auto; margin: 0in; font-size: 10pt; font-family: Calibri, sans-serif;"><b><span style="font-size: 11pt;"><span dir="ltr">Tuesday, </span></span></b><b><span style="font-size: 11pt;"><span dir="ltr">March 25</span><span dir="ltr">, 202</span><span dir="ltr">5,</span><span dir="ltr"> at 3:30pm</span></span></b><o:p></o:p></p><p class="MsoNormal" style="-webkit-text-size-adjust: auto; margin: 0in; font-size: 10pt; font-family: Calibri, sans-serif;"><b><span style="font-size: 11pt; background: yellow;">Location - TBD</span></b><o:p></o:p></p><p class="MsoNormal" style="-webkit-text-size-adjust: auto; margin: 0in; font-size: 10pt; font-family: Calibri, sans-serif;"><span style="font-size: 11pt;"> </span><o:p></o:p></p><p class="MsoNormal" style="-webkit-text-size-adjust: auto; margin: 0in; font-size: 10pt; font-family: Calibri, sans-serif;"><span style="font-size: 11pt;"> </span><o:p></o:p></p><p class="MsoNormal" style="-webkit-text-size-adjust: auto; margin: 0in; font-size: 10pt; font-family: Calibri, sans-serif;"><span style="font-size: 12pt;"> </span><o:p></o:p></p><p class="MsoNormal" style="-webkit-text-size-adjust: auto; margin: 0in; font-size: 10pt; font-family: Calibri, sans-serif;"><b><i><span style="font-size: 14pt; font-family: Aptos, sans-serif; color: rgb(33, 33, 33);">Title:</span></i></b><span style="font-size: 12pt; font-family: Aptos, sans-serif; color: rgb(33, 33, 33);"> </span><span style="font-size: 14pt; font-family: "Times New Roman", serif; color: rgb(33, 33, 33);">Locality and parameter tradeoffs for quantum codes</span><span style="font-size: 12pt; font-family: Aptos, sans-serif; color: rgb(33, 33, 33);"><o:p></o:p></span></p><p class="MsoNormal" style="-webkit-text-size-adjust: auto; margin: 0in; font-size: 10pt; font-family: Calibri, sans-serif;"><span style="font-size: 12pt; font-family: Aptos, sans-serif; color: rgb(33, 33, 33);"><br></span><b><i><span style="font-size: 14pt; font-family: Aptos, sans-serif; color: rgb(33, 33, 33);">Abstract:</span></i></b><span style="font-size: 12pt; font-family: Aptos, sans-serif; color: rgb(33, 33, 33);"> </span><span style="font-size: 14pt; font-family: "Times New Roman", serif; color: rgb(33, 33, 33);">Quantum (error-correcting) codes protect from noise the delicate entanglement of quantum states that distinguishes quantum computers from classical computers. In practice, local interactions — interactions between nearby qubits — are easier to implement than non-local ones, but constraining quantum codes to local interactions limits their quality. For example, the seminal Bravyi-Poulin-Terhal (BPT) bound states that a quantum code with only local interations in two dimensions must satisfy kd^2<=O(n), where n,k,d are the number physical qubits, number of logical qubits, and distance of the code, respectively.<br><br>In this talk, I will discuss how much "nonlocality" is needed to implement quantum codes beyond the BPT bound. Our works establish tight tradeoffs between the amount of nonlocality and the parameters of quantum codes, proving no-go results and showing matching code constructions. This talk will not assume prior background in quantum computing.<br></span><span style="font-size: 12pt; font-family: Aptos, sans-serif; color: rgb(33, 33, 33);"><br></span><span style="font-size: 14pt; font-family: "Times New Roman", serif; color: rgb(33, 33, 33);">Based on joint works with Samuel Dai and Eugene Tang</span><span style="font-size: 12pt; font-family: Aptos, sans-serif; color: rgb(33, 33, 33);">.</span></p><div dir="ltr"></div></body></html>