<div dir="ltr"><div><div><div><br></div>All you quantum computer experts.<br><br></div>I know next to nothing about quantum computers. All I know is that some people claim they will be able to render crypto currency security no longer secure. What would you guys give the odds that something like quantum computers could sometimes make crypto currencies not work. And by "not work" I mean even if the crypto currencies significantly increase the size of the keys, which I would think would be easy for crypto currencies to do, i.e. even a quantum computer could never solve a 10K byte key right?<br><br></div>Brent<br><br><br><div><br><div><br><br></div></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sat, Feb 25, 2017 at 6:28 PM, John Clark <span dir="ltr"><<a href="mailto:johnkclark@gmail.com" target="_blank">johnkclark@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><span style="font-family:arial,sans-serif">On Wed, Feb 22, 2017 at 2:33 PM, BillK </span><span dir="ltr" style="font-family:arial,sans-serif"><<a href="mailto:pharos@gmail.com" target="_blank">pharos@gmail.com</a>></span><span style="font-family:arial,sans-serif"> wrote:</span><br></div><div class="gmail_extra"><div class="gmail_quote"><br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"></blockquote><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline">></div>Well, nobody has built a proper quantum computer yet, (not counting<br>
D-Wave), so we don't know yet.<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"> </div>Current estimate is 4 to 5 years.<br></blockquote><div><font size="4"><br></font></div><div><font size="4">A D-wave type machine might be able to solve some problems and do so quantum mechanically but it wouldn't be Turing complete and be able to work on any problem as a general purpose computer can. Google and IBM have set there sights higher and are working on a true Turing complete Quantum Computer that would use <div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline">s</div>uperconducting loops. Microsoft is working on the most advanced and riskiest design of all, a Topological Quantum Computer; it would use 2 dimensional<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"> </div>quasi<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"></div>particles called non-abelian anyons.</font></div><div><br><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"></div><font size="4">The huge advantage non-abelian anyons<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"> </div>ha<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline">ve</div> is that they would be vastly less <div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline">s</div>susceptible to <div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"></div>quantum decoherence<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"> </div>than anything else, so much so that a <div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"></div>Topological Quantum Computer might be able to work at room temperature. <div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline">Not only do you need to cool a </div><span style="font-family:arial,helvetica,sans-serif">superconducting loop<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"> but because of </div></span><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"></div>quantum decoherence<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"> it only produces the correct results about 99.9% of the time. A large quantum computer would need a about ten nines so Google and IBM's machine would need massive amounts of expensive quantum error correcting circuitry. Microsoft's N</div>on-abelian anyons<font face="arial, helvetica, sans-serif"> </font><div class="gmail_default" style="display:inline"><font face="arial, helvetica, sans-serif">would give you about seven nines of precision right at the start so much less </font></div><span style="font-family:arial,helvetica,sans-serif">correcting circuitry<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"> would be needed</div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline">.</div></span><span style="font-family:arial,helvetica,sans-serif"> <div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline">T</div></span><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline">he only disadvantage is that physicists are only 95% certain that </div>non-abelian anyons<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"> exist.</div></font></div><div><font size="4"><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"><br></div></font></div><div><font size="4"><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"> John K Clark</div></font></div><div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><span style="font-family:arial,sans-serif"><br></span></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><span style="font-family:arial,sans-serif"><br></span></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></div></div></div><div class="gmail_quote"><br><br> <blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div class="m_2311551429727036288gmail-HOEnZb"><div class="m_2311551429727036288gmail-h5"><br>
</div></div></blockquote></div><br></div></div>
<br>______________________________<wbr>_________________<br>
extropy-chat mailing list<br>
<a href="mailto:extropy-chat@lists.extropy.org">extropy-chat@lists.extropy.org</a><br>
<a href="http://lists.extropy.org/mailman/listinfo.cgi/extropy-chat" rel="noreferrer" target="_blank">http://lists.extropy.org/<wbr>mailman/listinfo.cgi/extropy-<wbr>chat</a><br>
<br></blockquote></div><br></div>