<div dir="ltr"><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><font size="4" style="font-family:Arial,Helvetica,sans-serif"><b><font face="tahoma, sans-serif">There have been some important developments in the field of quantum computing during September, for example<span class="gmail_default">:</span></font></b><br></font><div style="font-family:Arial,Helvetica,sans-serif"><br></div><div style="font-family:Arial,Helvetica,sans-serif"><a href="https://news.harvard.edu/gazette/story/2025/09/clearing-significant-hurdle-to-quantum-computing/" target="_blank"><font size="4" face="tahoma, sans-serif"><b>A 3,000 quantum-bit system capable of continuous operation</b></font></a><br></div><div style="font-family:Arial,Helvetica,sans-serif"><br></div><div style="font-family:Arial,Helvetica,sans-serif"><font size="4" face="tahoma, sans-serif"><b>In their paper<span class="gmail_default"> from the September 15, 2025 issue of the journal Nature:</span></b></font></div><div style="font-family:Arial,Helvetica,sans-serif"><span class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></span></div><div style="font-family:Arial,Helvetica,sans-serif"><span class="gmail_default"><font size="4"><b><a href="https://www.nature.com/articles/s41586-025-09596-6" target="_blank"><font face="tahoma, sans-serif">Continuous operation of a coherent 3,000-qubit system</font></a><br></b></font></span></div><div style="font-family:Arial,Helvetica,sans-serif"><font size="4"><b><br></b></font></div><div style="font-family:Arial,Helvetica,sans-serif"><font size="4" face="tahoma, sans-serif"><b>The authors say:<span class="gmail_default"> </span></b></font></div><div style="font-family:Arial,Helvetica,sans-serif"><br></div><div style="font-family:Arial,Helvetica,sans-serif"><font face="tahoma, sans-serif"><i><span style="font-size:18px"><span class="gmail_default"><font face="arial, helvetica, sans-serif"></font><b>"</b></span><b>Our results pave the way for realization of large-scale continuously operated atomic clocks, sensors, and fault-tolerant quantum computers<span class="gmail_default">. [...]  </span></b></span><b><span style="color:rgb(33,36,56);font-size:18px">We demonstrated the continuous operation with a 3,000-qubit system,</span><span class="gmail_default" style="color:rgb(33,36,56);font-size:18px"> b</span><span style="color:rgb(33,36,56);font-size:18px">ut it's also clear that this approach will work for much larger numbers as well.<span class="gmail_default"> [...]  </span></span><span style="color:rgb(33,36,56);font-size:18px">We're showing a way where you can insert new atoms as you naturally lose them without destroying the information that's already in the system<span class="gmail_default">."</span></span></b></i></font></div><div style="font-family:Arial,Helvetica,sans-serif"><font face="tahoma, sans-serif"><i><b><span style="color:rgb(33,36,56);font-size:18px"><span class="gmail_default"><br></span></span></b></i></font></div><div style="font-family:Arial,Helvetica,sans-serif"><font face="tahoma, sans-serif"><b><span style="color:rgb(33,36,56);font-size:18px"><span class="gmail_default">There is a second paper of interest published in Nature on September 10. </span></span></b></font></div><div style="font-family:Arial,Helvetica,sans-serif"><font face="tahoma, sans-serif"><b><span style="color:rgb(33,36,56);font-size:18px"><span class="gmail_default"><br></span></span></b></font></div><div style="font-family:Arial,Helvetica,sans-serif"><a href="https://www.nature.com/articles/s41586-025-09475-0" target="_blank"><font face="tahoma, sans-serif" size="4"><b>Probing the Kitaev honeycomb model on a neutral-atom quantum computer</b></font></a></div><div style="font-family:Arial,Helvetica,sans-serif"><font face="tahoma, sans-serif"><b><span style="color:rgb(33,36,56);font-size:18px"><span class="gmail_default"><br></span></span></b></font></div><font size="4" face="tahoma, sans-serif"><b>Researchers found a way to configure atomic arrays so they simulate quantum magnets, this allows them to change the connectivity between quantum processors during computation. One of the authors of the paper said "<i>We can literally reconfigure the atomic quantum computer while it's operating. Basically, the system becomes a living organism</i>."</b></font><div style="font-family:Arial,Helvetica,sans-serif"><font face="tahoma, sans-serif" size="4"><b><br></b></font></div><div style="font-family:Arial,Helvetica,sans-serif"><font size="4" face="tahoma, sans-serif"><b>And there is a third paper from <span class="gmail_default">N</span>ature published on September 24<span class="gmail_default">, a</span> team demonstrated a new method of quantum error correction<span class="gmail_default" style="font-family:arial,helvetica,sans-serif">:</span></b></font></div><div style="font-family:Arial,Helvetica,sans-serif"><span style="font-family:arial,helvetica,sans-serif;font-size:large;font-weight:700"><br></span></div><div style="font-family:Arial,Helvetica,sans-serif"><font face="tahoma, sans-serif" size="4"><b><span class="gmail_default"><a href="https://www.nature.com/articles/s41586-025-09543-5" target="_blank">Low-overhead transversal fault tolerance for universal quantum computation</a> </span></b></font></div><div style="font-family:Arial,Helvetica,sans-serif"><font face="tahoma, sans-serif" size="4"><b><span class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></span></b></font></div><font size="4" face="tahoma, sans-serif"><b>The lead author said he thinks with this new method it should be possible to build a quantum computer that can execute billions of operations and continue running for days and "<i>Realizing this dream is now in our direct sight for the first time, ever. One can really see a very direct path towards realizing it</i>"</b></font><div style="font-family:Arial,Helvetica,sans-serif"><font size="4" face="tahoma, sans-serif"><b><span style="color:rgb(33,36,56)"><span class="gmail_default"><br></span></span></b></font></div><div style="font-family:Arial,Helvetica,sans-serif"><font size="4" face="tahoma, sans-serif"><b><span style="color:rgb(33,36,56)"><span class="gmail_default">In a fourth development the quantum computer company "Alice and Bob" announced a few days ago that they have produced superconducting "quantum cat "cubits that remain resistant to flip errors for more than an hour, the previous record was seven minutes. </span></span></b></font></div><div style="font-family:Arial,Helvetica,sans-serif"><br></div><div style="font-family:Arial,Helvetica,sans-serif"><a href="https://alice-bob.com/newsroom/alice-bob-surpasses-bit-flip-stability-record/" target="_blank"><font size="4" face="tahoma, sans-serif"><b>Alice & Bob Shares Preliminary Results Vastly Surpassing Previous Bit-Flip Time Record</b></font></a></div><div style="font-family:Arial,Helvetica,sans-serif"><br></div><div style="font-family:Arial,Helvetica,sans-serif"><div style="color:rgb(80,0,80)"><b><font face="tahoma, sans-serif"><font size="4">John K Clark    </font><font size="6"></font></font></b></div></div></div></div>