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<p class="MsoNormal" style="text-align:justify"><b><u><span style="font-size:10.5pt;font-family:DengXian">Title:</span></u></b><span style="font-size:10.5pt;font-family:DengXian"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:justify"><a name="_Hlk159452296"><b><span style="font-size:10.5pt;font-family:DengXian">Restricted Eavesdropping Analysis of Quantum Cryptography</span></b></a><span style="mso-bookmark:_Hlk159452296"></span><span style="font-size:10.5pt;font-family:DengXian"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:justify"><b><span style="font-size:10.5pt;font-family:DengXian"> </span></b><span style="font-size:10.5pt;font-family:DengXian"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:justify"><b><u><span style="font-size:10.5pt;font-family:DengXian">Abstract:</span></u></b><span style="font-size:10.5pt;font-family:DengXian"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:justify"><a name="_Hlk159451824"><b><span style="font-size:10.5pt;font-family:DengXian">Quantum computing is a fast-developing field, posing critical threats to the modern cryptography system. Thus, research in quantum
cryptography is of great importance for near-term applications. However, traditional security analysis of quantum cryptography assumes that the eavesdropper is omnipotent, with her "abilities" only limited by the laws of quantum physics. This is unrealistic
since the eavesdropper will be subject to certain reasonable limitations, same as the communication parties. In this seminar I will mainly discuss my work on "Restricted Eavesdropping Analysis of Quantum Cryptography", which extended traditional quantum cryptography
analysis to analyze a more realistic scenario where the eavesdropper is with a limited power collection ability. Such a restricted-eavesdropping scenario is highly applicable to wireless links such as microwave or free space optics ones. We will start from
the theory model of a quantum wiretap channel to establish lower bounds and upper bounds based on Hashing Inequality and Relative Entropy of Entanglement. Applications to realistic channel conditions will also be introduced where the eavesdropping and defense
strategies from both sides are investigated. Analytical and numerical conclusions will be discussed during the seminar.</span></b></a><span style="mso-bookmark:_Hlk159451824"><span style="font-size:10.5pt;font-family:DengXian"><o:p></o:p></span></span></p>
<p class="MsoNormal" style="text-align:justify"><span style="mso-bookmark:_Hlk159451824"><span style="font-size:10.5pt;font-family:DengXian"><o:p> </o:p></span></span></p>
<span style="mso-bookmark:_Hlk159451824"></span>
<p class="MsoNormal" style="text-align:justify"><b><u><span style="font-size:10.5pt;font-family:DengXian">Bio:</span></u></b><span style="font-size:10.5pt;font-family:DengXian"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:justify"><a name="_Hlk159451789"><b><span style="font-size:10.5pt;font-family:DengXian">Ziwen Pan obtained his Ph.D. degree at the Electrical & Computer Engineering department from the University of Arizona in 2022. His
major research work focuses on quantum communication/cryptography, including security analysis of generic quantum cryptography schemes and protocol designs for quantum key distributions. He has also worked on other topics such as entanglement-assisted communication,
quantum simulation and microtoroids. Additionally, he is experienced in classical communications research, and he is currently working on Qualcomm chipsets testing regarding IEEE standards on Wi-Fi, Bluetooth, etc. He has published in and served as a reviewer
for multiple Optica (formerly OSA), IEEE and APS journals.</span></b></a><span style="mso-bookmark:_Hlk159451789"></span><span style="font-size:10.5pt;font-family:DengXian"><o:p></o:p></span></p>
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<p class="MsoNormal" style="text-align:justify"><b><span style="font-size:10.5pt;font-family:DengXian">In his free time, Ziwen is a passionate badminton and table tennis player. Come join a game with him!</span></b><span style="font-size:10.5pt;font-family:DengXian"><o:p></o:p></span></p>
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