<div dir="ltr"><div>Adam,</div><div>Thanks for the link to that nice article, which explains this concept demonstration of optical elements working in the predicted manner, but is NOT a general purpose computer capable of cracking passwords. There is a huge amount of hype around quantum computing so people should read press releases carefully. For those of us old enough to remember computing in the 1960s, there was a flurry of activity and funding over optical computing using holograms and Fourier optics. My recollection is it arose from work at U Michigan to process SAR (Synthetic Aperture Radar) imagery by Leith and Upatnieks (they were key inventors of the off-axis hologram). There was lots of funding at the time and hype over the computational speed of 2D Fourier Transforms done optically. Compared with the microsecond CPU cycle times of the era, on single processors, parallel computation at the 'speed of light' in thousands of channels sounded great. But the details commonly overlooked in the hype of the time were limitations on conversion from electrical to optical signals and back, the dynamic range limits of the optics and the special purpose nature of the computations.</div><div><br></div><div>David Lees<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Jun 2, 2022 at 10:36 AM Adam Broun <<a href="mailto:abroun@gmail.com">abroun@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div> First of all, this development is a highly specific use-case, not a general purpose computer. Here's a better explanation <a href="https://arstechnica.com/science/2022/06/manipulating-photons-for-microseconds-tops-9000-years-on-a-supercomputer" target="_blank">https://arstechnica.com/science/2022/06/manipulating-photons-for-microseconds-tops-9000-years-on-a-supercomputer</a></div><div><br></div><div>Second, quantum computing is likely to break encryption that relies on prime factorization being hard, which underpins a lot of public key systems. But many symmetric encryption algos are unaffected. So it will be a challenge, but not the end of the world.</div><div><br></div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Jun 2, 2022 at 10:04 AM Steve Isenberg <<a href="mailto:smisenberg@gmail.com" target="_blank">smisenberg@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div class="gmail_default" style="font-family:trebuchet ms,sans-serif;font-size:small;color:rgb(11,83,148)">So this means that the security we've been feeling using complex passwords may end soon.</div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif;font-size:small;color:rgb(11,83,148)"><br></div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif;font-size:small;color:rgb(11,83,148)">According to the article, quantum computers solve a 9,000 year problem in 36 microseconds. Amazing.</div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif;font-size:small;color:rgb(11,83,148)">So it could conceivably solve a 9,000,000 year problem in 36 milliseconds (36,000 microseconds) or a 250,000,000 year problem in a second.</div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif;font-size:small;color:rgb(11,83,148)"><br></div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif;font-size:small;color:rgb(11,83,148)">From (<a href="https://vpnalert.com/resources/how-long-does-it-take-to-crack-a-password/" target="_blank">https://vpnalert.com/resources/how-long-does-it-take-to-crack-a-password/</a>) it would take up to 46,000,000 years to crack a 15 character password using numbers, upper and lower case letters using a conventional computer; with a quantum computer this would be about 1/5 second.</div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif;font-size:small;color:rgb(11,83,148)"><br></div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif;font-size:small;color:rgb(11,83,148)">From (<a href="https://www.komando.com/security-privacy/check-your-password-strength/783192/" target="_blank">https://www.komando.com/security-privacy/check-your-password-strength/783192/</a>) if you use a 18 character password with numbers, upper & lower case letters, and symbols it would take a conventional computer up to 7,000,000,000,000 (7qd) years; a quantum computer would take up to 28,000 seconds, under 8 hours.</div><br><div class="gmail_default" style="font-family:trebuchet ms,sans-serif;font-size:small;color:rgb(11,83,148)">Regards,</div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif;font-size:small;color:rgb(11,83,148)">-steve<br></div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif;font-size:small;color:rgb(11,83,148)"><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Jun 2, 2022 at 9:08 AM <<a href="mailto:palbin24@yahoo.com" target="_blank">palbin24@yahoo.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="auto"><div>Interesting overview of the current state of quantum computing </div><div><br></div><a href="https://www.theregister.com/2022/06/02/quantum_advantage_canada/" target="_blank">https://www.theregister.com/2022/06/02/quantum_advantage_canada/</a><br><br><div dir="ltr">Peter</div></div>===============================================<br>
::The Lexington Computer and Technology Group Mailing List::<br>
Reply goes to sender only; Reply All to send to list.<br>
Send to the list: <a href="mailto:LCTG@lists.toku.us" target="_blank">LCTG@lists.toku.us</a> Message archives: <a href="http://lists.toku.us/private.cgi/lctg-toku.us" rel="noreferrer" target="_blank">http://lists.toku.us/private.cgi/lctg-toku.us</a><br>
To subscribe: email <a href="mailto:lctg-subscribe@toku.us" target="_blank">lctg-subscribe@toku.us</a> To unsubscribe: email <a href="mailto:lctg-unsubscribe@toku.us" target="_blank">lctg-unsubscribe@toku.us</a><br>
Future and Past meeting information: <a href="http://LCTG.toku.us" rel="noreferrer" target="_blank">http://LCTG.toku.us</a><br>
List information: <a href="http://lists.toku.us/listinfo.cgi/lctg-toku.us" rel="noreferrer" target="_blank">http://lists.toku.us/listinfo.cgi/lctg-toku.us</a><br>
This message was sent to <a href="mailto:s%2Blctglist@smistuff.com" target="_blank">s+lctglist@smistuff.com</a>.<br>
Set your list options: <a href="http://lists.toku.us/options.cgi/lctg-toku.us/s+lctglist@smistuff.com" rel="noreferrer" target="_blank">http://lists.toku.us/options.cgi/lctg-toku.us/s+lctglist@smistuff.com</a></blockquote></div>
===============================================<br>
::The Lexington Computer and Technology Group Mailing List::<br>
Reply goes to sender only; Reply All to send to list.<br>
Send to the list: <a href="mailto:LCTG@lists.toku.us" target="_blank">LCTG@lists.toku.us</a> Message archives: <a href="http://lists.toku.us/private.cgi/lctg-toku.us" rel="noreferrer" target="_blank">http://lists.toku.us/private.cgi/lctg-toku.us</a><br>
To subscribe: email <a href="mailto:lctg-subscribe@toku.us" target="_blank">lctg-subscribe@toku.us</a> To unsubscribe: email <a href="mailto:lctg-unsubscribe@toku.us" target="_blank">lctg-unsubscribe@toku.us</a><br>
Future and Past meeting information: <a href="http://LCTG.toku.us" rel="noreferrer" target="_blank">http://LCTG.toku.us</a><br>
List information: <a href="http://lists.toku.us/listinfo.cgi/lctg-toku.us" rel="noreferrer" target="_blank">http://lists.toku.us/listinfo.cgi/lctg-toku.us</a><br>
This message was sent to <a href="mailto:abroun@gmail.com" target="_blank">abroun@gmail.com</a>.<br>
Set your list options: <a href="http://lists.toku.us/options.cgi/lctg-toku.us/abroun@gmail.com" rel="noreferrer" target="_blank">http://lists.toku.us/options.cgi/lctg-toku.us/abroun@gmail.com</a></blockquote></div>
===============================================<br>
::The Lexington Computer and Technology Group Mailing List::<br>
Reply goes to sender only; Reply All to send to list.<br>
Send to the list: <a href="mailto:LCTG@lists.toku.us" target="_blank">LCTG@lists.toku.us</a> Message archives: <a href="http://lists.toku.us/private.cgi/lctg-toku.us" rel="noreferrer" target="_blank">http://lists.toku.us/private.cgi/lctg-toku.us</a><br>
To subscribe: email <a href="mailto:lctg-subscribe@toku.us" target="_blank">lctg-subscribe@toku.us</a> To unsubscribe: email <a href="mailto:lctg-unsubscribe@toku.us" target="_blank">lctg-unsubscribe@toku.us</a><br>
Future and Past meeting information: <a href="http://LCTG.toku.us" rel="noreferrer" target="_blank">http://LCTG.toku.us</a><br>
List information: <a href="http://lists.toku.us/listinfo.cgi/lctg-toku.us" rel="noreferrer" target="_blank">http://lists.toku.us/listinfo.cgi/lctg-toku.us</a><br>
This message was sent to <a href="mailto:joeoptics@gmail.com" target="_blank">joeoptics@gmail.com</a>.<br>
Set your list options: <a href="http://lists.toku.us/options.cgi/lctg-toku.us/joeoptics@gmail.com" rel="noreferrer" target="_blank">http://lists.toku.us/options.cgi/lctg-toku.us/joeoptics@gmail.com</a></blockquote></div>