<div dir="ltr"><div class="gmail_default" style=""><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><div class="gmail_quote" style="font-family:Arial,Helvetica,sans-serif"><div class="gmail_default"><font size="4"><font face="arial, helvetica, sans-serif">Wow, I'm glad the list is back, at least for now. I tried to send the first part of this a few weeks ago but no joy, and then there were even more exciting developments. </font></font></div><div class="gmail_default"><font size="4"><font face="arial, helvetica, sans-serif">==</font></font></div><div class="gmail_default"><font size="4"><font face="arial, helvetica, sans-serif">There is a excellent FAQ by Quantum Computer expert Scott Aaronson about the Google claim of Quantum Supremacy. Aaronson is noted for throwing cold water over claims of a breakthrough in his field, but not this time!  </font>Aaronson is clearly excited, he compares Google's Quantum Computer to the Wright brothers 1903 flyer or Enrico Fermi's 1942 pile, the world's first nuclear reactor:</font></div><div class="gmail_default"><font size="4"><br></font></div></div><div class="gmail_quote" style="font-family:Arial,Helvetica,sans-serif"><font size="4"><a href="https://www.scottaaronson.com/blog/" target="_blank">Scott’s Supreme Quantum Supremacy FAQ!</a>   </font></div><div class="gmail_quote" style="font-family:Arial,Helvetica,sans-serif"><font size="4">== </font></div></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><font size="4">Here is a copy of that leaked paper:</font></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><a href="https://drive.google.com/file/d/19lv8p1fB47z1pEZVlfDXhop082Lc-kdD/view" target="_blank"><font size="4">Quantum Supremacy Using a Programmable Superconducting Processor</font></a><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><font size="4">I found these quotes from it to be particularly interesting:</font></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></div><i style="font-family:Arial,Helvetica,sans-serif"><font size="4">"<span class="gmail_default" style="font-family:arial,helvetica,sans-serif">W</span>e show that quantum speedup is achievable in a real-world system and is<br>not precluded by any hidden physical laws." </font></i><div style=""><i style="font-family:Arial,Helvetica,sans-serif"><font size="4"><br><span class="gmail_default" style="font-family:arial,helvetica,sans-serif">"O</span>ur processor takes about 200 seconds to sample one instance of the quantum circuit 1 million times, a state-of-the-art supercomputer would require approximately 10,000 years to perform the equivalent task.<span class="gmail_default" style="font-family:arial,helvetica,sans-serif">"</span></font></i><div style="font-family:Arial,Helvetica,sans-serif"><span class="gmail_default" style="font-family:arial,helvetica,sans-serif"><i><font size="4"><br></font></i></span></div><i style="font-family:Arial,Helvetica,sans-serif"><font size="4"><span class="gmail_default" style="font-family:arial,helvetica,sans-serif">"</span>Quantum processors based on superconducting qubits can now perform computations in a Hilbert space of dimension 2<span class="gmail_default" style="font-family:arial,helvetica,sans-serif">^</span>53 ≈ 9 × 10<span class="gmail_default" style="font-family:arial,helvetica,sans-serif">^</span>15, beyond the reach of the fastest classical supercomputers available today. To our knowledge, this experiment marks the first computation that can only be performed on a quantum processor.<span class="gmail_default" style="font-family:arial,helvetica,sans-serif">"</span></font></i><div style="font-family:Arial,Helvetica,sans-serif"><span class="gmail_default" style="font-family:arial,helvetica,sans-serif"><i><font size="4"><br></font></i></span></div><div style="font-family:Arial,Helvetica,sans-serif"><span id="gmail-m_738647592581530334gmail-docs-internal-guid-83ff0d17-7fff-1018-e804-19e865cffaac"><span style="font-family:Arial;color:rgb(0,0,0);background-color:transparent;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap"><i><font size="4"><span class="gmail_default" style="font-family:arial,helvetica,sans-serif">"</span>Quantum processors have thus reached the regime of quantum supremacy. We expect their computational power will continue to grow at a double exponential rate<span class="gmail_default" style="font-family:arial,helvetica,sans-serif">"</span></font></i></span></span></div><div style="font-family:Arial,Helvetica,sans-serif"><span style="font-family:Arial;color:rgb(0,0,0);background-color:transparent;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap"><i><font size="4"><span class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></span></font></i></span></div><div style="font-family:Arial,Helvetica,sans-serif"><font size="4"><span style="font-family:Arial;color:rgb(0,0,0);background-color:transparent;font-variant-numeric:normal;font-variant-east-asian:normal;vertical-align:baseline;white-space:pre-wrap"><span class="gmail_default" style="font-family:arial,helvetica,sans-serif">For me the most stunning thing about the entire article is the 3 words "</span></span>double exponential rate<span class="gmail_default" style="font-family:arial,helvetica,sans-serif">"</span></font></div><div style="font-family:Arial,Helvetica,sans-serif"><font size="4"><span class="gmail_default" style="font-family:arial,helvetica,sans-serif">==</span></font></div><div style=""><font size="4" style=""><span class="gmail_default" style=""><font face="arial, helvetica, sans-serif">And in a completely different development there is yet more quantum computing news that happened when the list was dead. </font></span></font><span style="font-family:Arial,Helvetica,sans-serif;font-size:large">For the first time a fully controllable ten-qubit spin register with a quantum memory of 75 seconds has been developed. And they managed to achieve this without using any error correcting at all which the researchers believe is the next step</span><span class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:large">;</span><span style="font-family:Arial,Helvetica,sans-serif;font-size:large"> </span><span style="font-family:Arial,Helvetica,sans-serif;font-size:large">they conclude</span><span style="font-family:Arial,Helvetica,sans-serif;font-size:large"> </span><span class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:large">their article in the September 11 2019 Physical review </span><span style="font-family:Arial,Helvetica,sans-serif;font-size:large">with:</span></div><div style="font-family:Arial,Helvetica,sans-serif"><span style="font-size:large"><br></span></div><div style="font-family:Arial,Helvetica,sans-serif"><font size="4"><span class="gmail_default" style="font-family:arial,helvetica,sans-serif">"</span><i>our multiqubit register paves the way for the realization of rudimentary few-node quantum networks comprising tens of qubits. This will enable the investigation of basic error correction codes and algorithms over quantum networks</i><span class="gmail_default" style="font-family:arial,helvetica,sans-serif"><i></i>".</span></font><div><font face="arial, helvetica, sans-serif" size="4"><br></font></div><div><font face="arial, helvetica, sans-serif" size="4"><a href="https://journals.aps.org/prx/pdf/10.1103/PhysRevX.9.031045" target="_blank">A Ten-Qubit Solid-State Spin Register with Quantum Memory Over One Minute</a><br></font></div><div><br></div><div>==</div><div><br></div><div><font size="4">And if you want to know who coined the term "Quantum Supremacy and why look here:</font></div><div><font size="4"><br></font></div><div><font size="4"><a href="https://www.quantamagazine.org/john-preskill-explains-quantum-supremacy-20191002/">Why I Called It ‘Quantum Supremacy’</a><br></font></div><div><br></div></div><div style="font-family:Arial,Helvetica,sans-serif"><font size="4"><span class="gmail_default" style="font-family:arial,helvetica,sans-serif"> John K Clark</span></font></div></div></div></div>