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<p class="MsoNormal" align="center" style="text-align:center;background:white"><b><span style="font-size:24.0pt;font-family:"Times New Roman",serif;color:#006FC0"><img width="975" height="296" style="width:10.1562in;height:3.0833in" id="_x0032_30bc5f3-f926-4445-ba2c-cd4f3c1044c2" src="cid:230bc5f3-f926-4445-ba2c-cd4f3c1044c2"></span></b><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal" align="center" style="text-align:center;background:white"><span class="contentpasted0"><b><span style="font-size:24.0pt;font-family:"Times New Roman",serif;color:#006FC0">Condensed Matter Physics Seminar</span></b></span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
<p class="MsoNormal" align="center" style="text-align:center;background:white"><span class="contentpasted0"><b><i><span style="font-size:26.0pt;font-family:"Times New Roman",serif;color:black">Topological Stabilizer Code on a Honeycomb Lattice</span></i></b></span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
<p class="MsoNormal" align="center" style="text-align:center;background:white"><span class="contentpasted0"><b><i><span style="font-size:28.0pt;font-family:"Times New Roman",serif;color:black">Dr. Basudha Srivastava</span></i></b></span><b><i><span style="font-size:26.0pt;font-family:"Times New Roman",serif;color:black"><br>
</span></i></b><span class="contentpasted0"><i><span style="font-size:24.0pt;font-family:"Times New Roman",serif;color:black">Goteborg University</span></i></span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span class="contentpasted0"><span style="font-size:11.5pt;font-family:"Segoe UI",sans-serif;color:#242424;background:white">Abstract: Quantum systems are adversely affected by noise due to interactions with the
environment. Quantum error correction is a technique that relies on the principle of redundancy to encode logical information in additional qubits to better protect the system against noise, and is required in order to design a viable quantum computer. One
of the most popular classes of quantum error-correcting codes are topological stabilizer codes, where the logical errors correspond to strings extended between boundaries and which use repeated local measurements to detect and correct errors on the code.</span></span><span style="font-size:11.5pt;font-family:"Segoe UI",sans-serif;color:#242424"><br>
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<span class="contentpasted0"><span style="background:white">In this talk, I will present a novel topological stabilizer code, the XYZ^2 code, which is implemented on a hexagonal grid of qubits and encodes a logical qubit with the help of weight-six and weight-two
stabilizer measurements. This code demonstrates high thresholds and reduced logical failure rates for biased noise error models simulated under perfect stabilizer measurement conditions. The XYZ^2 code is equivalent to a concatenation of a low-level two-qubit
error detection code, and a high-level YZZY-type surface code. We use the concatenated structure of the code to decode syndrome information using a two-level matching decoder, which can also incorporate errors on the measurement qubits.</span></span></span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
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<span class="contentpasted0"><b><span style="font-size:12.0pt;color:#2F5496">Wednesday, March 15<sup>th</sup>, 2023</span></b></span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
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<span class="contentpasted0"><b><span style="font-size:12.0pt;color:#2F5496">4:00 p.m. in the Physics Reading Room (3035)</span></b></span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
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