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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Dear all,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black">It’s my pleasure to invite you to a special Optics Division Colloquium entitled "Quantum networking and computing with trapped ions" (see abstract below), by Professor David Lucas, Clarendon Laboratory,
Oxford. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Time & Location: Wed 30th August, 11am, JA314<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Looking forward to seeing many of you on Wednesday!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Best wishes,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Stefan<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB">===========================<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB">Professor Stefan Kuhr<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB">Head of Department<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB">University of Strathclyde<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB">Department of Physics<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB">Glasgow <o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB">G4 0NG<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB">United Kingdom<o:p></o:p></span></p>
<p class="MsoNormal"><a href="mailto:Stefan.kuhr@strath.ac.uk"><span style="color:#0563C1;mso-fareast-language:EN-GB">Stefan.kuhr@strath.ac.uk</span></a><span style="mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
<div style="mso-element:para-border-div;border:none;border-bottom:double windowtext 2.25pt;padding:0cm 0cm 1.0pt 0cm">
<p class="MsoNormal" style="border:none;padding:0cm"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">ABSTRACT: <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black">I will describe recent work at Oxford on quantum networking applications using trapped-ion qubits. Our apparatus consists of two independent ion traps, separated by 2 metres, linked via a single-photon
optical fibre interface. We can generate high-fidelity (>90%) entanglement between trapped-ion qubits, one stored in each trap, at high speed (up to 200 entanglement events per second). Using this setup we have made demonstrations of several quantum technological
applications in the areas of cryptography, metrology and information processing [1,2,3].
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Firstly, we achieved a full implementation of a "device-independent" QKD protocol [1]; that is, the generation of a shared secret key between Alice and Bob, reliant only on their possession of
a pair of entangled particles - entanglement which no eavesdropper can share [4]. Secondly, we demonstrated entanglement-enhanced frequency comparison of two optical atomic clocks [2], with precision approaching the Heisenberg limit (the ultimate measurement
precision allowed by quantum mechanics). Recently, we have added robust quantum memory to our network [5], which has enabled a demonstration of verifiable blind quantum computing [3]; that is, the ability of a "client" to run and verify a simple protocol on
the "server's" quantum processor, without the server being able to see the client's data or algorithm.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black">[1] D.P.Nadlinger et al., Nature 2022.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black">[2] B.C.Nichol, R.Srinivas et al., Nature 2022.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black">[3] P.Drmota et al., arXiv 2023.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black">[4] A.Ekert, Phys.Rev.Lett. 1991.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE" style="font-size:12.0pt;color:black">[5] P.Drmota et al., Phys.Rev.Lett. 2023.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE" style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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