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jaybus0
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re: A treasure-trove of tasty Turing machines
jaybus0   3/26/2012 12:13:48 PM
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Very strange how history repeats itself. The Turing machine is Alan Turing's mathematical proof that a programmable digital computer was possible using nothing but George Bool's logic gates, however they had to wait for Tommy Flowers to invent a working vacuum tube logic gate. In 1985, David Deutsch described a quantum Turing machine using nothing but Richard Feynman's Qbits, or in other words a mathematical proof that a programmable quantum computer was possible. Now we are waiting on someone to invent a practical quantum logic gate. Just recently, a single atom transistor has been created (http://www.purdue.edu/newsroom/research/2012/120219KlimeckAtom.html). I wonder when this article will be repeated for the, as yet to be created, quantum Turing machine.

Max The Magnificent
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re: A treasure-trove of tasty Turing machines
Max The Magnificent   3/26/2012 1:24:20 PM
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@jaybus "I wonder when this article will be repeated..." In the spirit of 'quantum' I would have to say that the answer to this question is indeterminate :-)

ReneCardenas
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re: A treasure-trove of tasty Turing machines
ReneCardenas   3/29/2012 2:45:56 PM
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Like in the CERN lab effort, the smaller you digging into understand subparticles, the larger the forces required (The practical size of a magnetic field generator is not limited by the size but the COST and complexity of the structure). Likewise, I infer by your comment Max, that there is a practical limit of economics. The cool factor can only take you so far.



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As data rates begin to move beyond 25 Gbps channels, new problems arise. Getting to 50 Gbps channels might not be possible with the traditional NRZ (2-level) signaling. PAM4 lets data rates double with only a small increase in channel bandwidth by sending two bits per symbol. But, it brings new measurement and analysis problems. Signal integrity sage Ransom Stephens will explain how PAM4 differs from NRZ and what to expect in design, measurement, and signal analysis.

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