Message boards :
Science (non-SETI) :
Interesting Physics

Message board moderation

Previous · 1 · 2 · 3 · 4 · **5** · 6 · 7 · 8 . . . 20 · Next

Author | Message |
---|---|

janneseti Send message Joined: 14 Oct 09 Posts: 14106 Credit: 655,366 RAC: 0 |
Still would like to know why so called quantum computers are good at factoring and exactly why and how the "circuitry" and logic works. Hmm. Quantum computers are only good at factorizing. Classical computers are not. And exactly why and how the "circuitry" and logic works. Their is no such thing as Exact events in the quantum world. Only Probabilities. Here is what you have to know if you want to know how a quantum computer works. http://www.quantiki.org/wiki/Basic_concepts_in_quantum_computation |

William Rothamel Send message Joined: 25 Oct 06 Posts: 3364 Credit: 1,341,063 RAC: 1 |
Their is no such thing as Exact events in the quantum world. Well then if true then we could never have a useful result nor a piece of actual hardware. It's time for all of us pseudo intellectuals to come out from hiding behind the term "quantum" and get to discussing real logic, problems, circuitry or small atomic structures and results in the Quantum world. There are in fact true and actual events in the quantum world or else we would not have spectroscopy. Perhaps the term "quantum" has been applied to too many things that we don't fully understand or have a good explanation for. |

William Rothamel Send message Joined: 25 Oct 06 Posts: 3364 Credit: 1,341,063 RAC: 1 |
Thank you for the reference on quantum computation. Just like the Hoopla over threshold logic and artificial neurons 50 years ago it all appears to decompose into Boolean logic and binary circuits. Neurons never caught on since digital was faster than analog and digital representations of artificial neurons used lots of unnecessary hardware. The logical power of these neurons also decomposed into binary and Boolean logic. Perhaps Glorioso and I should come out of retirement and set out to debunk quantum computing as a miracle hope for the future. The work that was done by Bob and I on Artificial Neurons/intelligence is not in machine-readable form since it was done 50 years ago --or else I would offer it for anyone interested in the topic. Truthfully though I will be contrite and take my CD course on quantum technology and wade though the Bras and the Kets once again this time holding back my distaste for pedantic flummery. I am sure that the field is fully worthy of support and experimentation--I am simply expressing my frustration with not having every-day explanations in known scientific terms for its perceived and actual hardware structure and benefits. As for Quantum Mechanics :::: I know nothing, but I know what I don't know |

tullio Volunteer moderator Volunteer tester Send message Joined: 9 Apr 04 Posts: 6680 Credit: 1,965,744 RAC: 331 |
IBM is investing heavily on quantum computers research. I don't think IBM is going after illusions. Tullio E.G. See IBM Research Division, T.j.Watson Research Center, New York, USA |

William Rothamel Send message Joined: 25 Oct 06 Posts: 3364 Credit: 1,341,063 RAC: 1 |
By the term "Quantum Computers" they may be referring to making faster computers by going to ever smaller structures and data paths. This might lead to using singe atoms as storage and logic switches. This may be termed quantum since it appears at the very small structures and might make use of the quantumized energy levels and spins of electron orbits. The question I have is will the underlying logic be Boolean or will it somehow involve the uncertainty of a third state ? |

tullio Volunteer moderator Volunteer tester Send message Joined: 9 Apr 04 Posts: 6680 Credit: 1,965,744 RAC: 331 |
Ask IBM. Tullio |

janneseti Send message Joined: 14 Oct 09 Posts: 14106 Credit: 655,366 RAC: 0 |
This may be termed quantum since it appears at the very small structures and might make use of the quantumized energy levels and spins of electron orbits. To me that's the very definition of a quantum computer. The question I have is will the underlying logic be Boolean or will it somehow involve the uncertainty of a third state ? The underlying logic is Boolean. True or false. Nothing else. The superpositioned state is "only" a sort of a mixed mirror of the two "normal" states. btw. classical computers has Boolean values with three values:) The third value is called "undefined" and I wonder how many programmers who knows about it... |

tullio Volunteer moderator Volunteer tester Send message Joined: 9 Apr 04 Posts: 6680 Credit: 1,965,744 RAC: 331 |
Quantum computing is only a part of quantum information processing, which sheds a new light on quantum mechanics. The research done on quantum computing since the days of Richard Feynman has produced an interpretation of quantum mechanics which goes beyond the Copenhagen interpretation of the Twenties, and this is perhaps the major achievement of research on quantum computing. Tullio |

janneseti Send message Joined: 14 Oct 09 Posts: 14106 Credit: 655,366 RAC: 0 |
The research done on quantum computing since the days of Richard Feynman has produced an interpretation of quantum mechanics which goes beyond the Copenhagen interpretation of the Twenties, and this is perhaps the major achievement of research on quantum computing. Fyenman presented his idea with his own new QM diagrams to Niels Bohr and others at a conference. Niels said "You cannot do that!" Anyway. Those diagrams are still used. The two Feynman diagrams for an electron-positron scattering. |

tullio Volunteer moderator Volunteer tester Send message Joined: 9 Apr 04 Posts: 6680 Credit: 1,965,744 RAC: 331 |
It seems that D-Wave has sold a 1000 qubit computer to NASA and Google. Price is not specified. They will cooperate in research. Tullio |

janneseti Send message Joined: 14 Oct 09 Posts: 14106 Credit: 655,366 RAC: 0 |
The Fridge. http://www.dwavesys.com/d-wave-two-system Power and Cooling “The Fridge” is a closed cycle dilution refrigerator The superconducting processor generates no heat Cooled to 180x colder than interstellar space (0.015 Kelvin) But where is the quantum computing? A lattice of 1000 tiny superconducting circuits, known as qubits, is chilled close to absolute zero to get quantum effects There are no tiny circuits, known as qubits. You cannot make circuits at atomic levels. The Revolutionary Quantum Computer That May Not Be Quantum at All http://www.wired.com/2014/05/quantum-computing I'm getting cooled feet:) https://youtu.be/CMdHDHEuOUE |

William Rothamel Send message Joined: 25 Oct 06 Posts: 3364 Credit: 1,341,063 RAC: 1 |
The third value is called "undefined" I believe in logic design that is actually a "Don't Care" that's what I remember from my early days working in digital computers. |

William Rothamel Send message Joined: 25 Oct 06 Posts: 3364 Credit: 1,341,063 RAC: 1 |
Thank you all for the responses--I am taking my course in Quantum Mechanics and will explain any enlightenments if I actually achieve them |

William Rothamel Send message Joined: 25 Oct 06 Posts: 3364 Credit: 1,341,063 RAC: 1 |
finding the solution to mathematical conundrums with lots of constraints, like the best path among many possible routes to a destination Here's some thoughts on these high flown statements: This type of problem is a linear programming problem which basically is solved by tree-pruning algorithms that produce a solution that is as good as can be for the expenditure of computing time and money that one is willing to put forth. A significant contribution was made by Narendra Karmakar of Bell Labs--he was there as was I in the 80's. His algorithm used hyper -geometry to explore the solution space much more efficiently. It's hard to imagine that today's super-computers using this algorithm could be beaten in any kind of reasonable time by whatever perceived advantage that a quantum computer is alleged to have. perhaps I am a bit of a Luddite or at least a Skeptic--stuck in the past--I am easily convinced by demonstrated facts however. |

tullio Volunteer moderator Volunteer tester Send message Joined: 9 Apr 04 Posts: 6680 Credit: 1,965,744 RAC: 331 |
Have you ever tried to calcolate the Ackermann function? It is a recursive function of two integer variables and can kill any computer if you try to calcolate ack(5,5) or higher. To iterate is human, to recurse is divine. Tullio |

janneseti Send message Joined: 14 Oct 09 Posts: 14106 Credit: 655,366 RAC: 0 |
The third value is called "undefined" And "N/A" for Not applicable. The problem starts when you are storing Boolean values in a database. When programming an IF true THEN do somethingyou miss all the records that are N/A! |

William Rothamel Send message Joined: 25 Oct 06 Posts: 3364 Credit: 1,341,063 RAC: 1 |
I am proceeding with answers to how a "quantum" computer might work. I have now learned that the underlying logic in the quantum world is not the classical Boolean logic defined by set theory but rather it's logic is based on Vector Spaces over the complex numbers (Hilbert Spaces). I hope to explain more in the near future. |

Julie Volunteer moderator Volunteer tester Send message Joined: 28 Oct 09 Posts: 33605 Credit: 14,116,370 RAC: 7,909 |
I am proceeding with answers to how a "quantum" computer might work. I have now learned that the underlying logic in the quantum world is not the classical Boolean logic defined by set theory but rather it's logic is based on Vector Spaces over the complex numbers (Hilbert Spaces). I hope to explain more in the near future. Looking forward to it. Quantum computing seems like one big mystery to me but oh so interesting. rOZZ Music Pictures |

tullio Volunteer moderator Volunteer tester Send message Joined: 9 Apr 04 Posts: 6680 Credit: 1,965,744 RAC: 331 |
All quantum theory is based on Hilbert spaces, which are Banach spaces plus s scalar product. This is the classical Dirac formulation of quantum mechanics, but scalar products of Hilbert space vectors can produce complex fanctions as in the Schroedinger equation. Tullio |

Julie Volunteer moderator Volunteer tester Send message Joined: 28 Oct 09 Posts: 33605 Credit: 14,116,370 RAC: 7,909 |
http://www.bbc.com/news/science-environment-11998687 Dr Brembs and others have used mathematical models to simulate brain activity on a computer, finding that what worked best was a combination of deterministic behaviour and what is known as stochastic behaviour - which may look random but actually, in time, follows a defined set of probabilities. rOZZ Music Pictures |

©2018 University of California

SETI@home and Astropulse are funded by grants from the National Science Foundation, NASA, and donations from SETI@home volunteers. AstroPulse is funded in part by the NSF through grant AST-0307956.