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<p>[QUOTE="-jeffB, post: 2665540, member: 27832"]Quantum computers that can factor the number 15 are real. I have no doubt that there are a number of them on the MIT campus. Perhaps some of them can factor other numbers, like 12, or even 120 -- given tens or hundreds of thousands of dollars to build them, thousands of dollars a month to maintain them at cryogenic temperatures, and minutes or hours to set up the calculation, run it, and extract the results. Results that any conventional computer can produce in <i>microseconds</i>.</p><p><br /></p><p><br /></p><p><br /></p><p>That's entirely false, and that's the point you're missing.</p><p><br /></p><p>The "special sauce" in quantum computing is that a quantum computer's qubits are <i>all</i> entangled with one another. That entanglement is what allows quantum computation in the first place. That entanglement is what's so hard to establish and maintain, and it's why nobody has taken a hundred five-qubit computers and combined them into a single 500-qubit machine.</p><p><br /></p><p>It's even worse than the old project-management joke of hiring nine women to produce a baby in one month. At least nine women can produce nine babies in nine months. Doing what you propose is the equivalent of giving nine women nine months, and expecting them to produce 512 (two to the ninth power) babies.[/QUOTE]</p><p><br /></p>
[QUOTE="-jeffB, post: 2665540, member: 27832"]Quantum computers that can factor the number 15 are real. I have no doubt that there are a number of them on the MIT campus. Perhaps some of them can factor other numbers, like 12, or even 120 -- given tens or hundreds of thousands of dollars to build them, thousands of dollars a month to maintain them at cryogenic temperatures, and minutes or hours to set up the calculation, run it, and extract the results. Results that any conventional computer can produce in [I]microseconds[/I]. That's entirely false, and that's the point you're missing. The "special sauce" in quantum computing is that a quantum computer's qubits are [I]all[/I] entangled with one another. That entanglement is what allows quantum computation in the first place. That entanglement is what's so hard to establish and maintain, and it's why nobody has taken a hundred five-qubit computers and combined them into a single 500-qubit machine. It's even worse than the old project-management joke of hiring nine women to produce a baby in one month. At least nine women can produce nine babies in nine months. Doing what you propose is the equivalent of giving nine women nine months, and expecting them to produce 512 (two to the ninth power) babies.[/QUOTE]
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