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| Google claims to have reached quantum supremacy |
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| SilverSolder:
I get the sense that understanding quantum computing requires some kind of mental leap - it is not explainable in terms of classic computer science (or analog electronics)? Each qubit is essentially in all possible states at the same time... hard to implement when you're a dimension or two short of a dollar! |
| SiliconWizard:
And then, there's the quantum entanglement. |
| RoGeorge:
--- Quote from: SilverSolder on September 24, 2019, 05:32:26 pm ---I get the sense that understanding quantum computing requires some kind of mental leap - it is not explainable in terms of classic computer science (or analog electronics)? Each qubit is essentially in all possible states at the same time... hard to implement when you're a dimension or two short of a dollar! --- End quote --- A classic computer and a quantum computer doesn't have much in common. It's like a crocodile and an airplane. They both can "float" (calculate) except that one is swimming in a river and the other is flying in the sky. A qubit is NOT in all the possible states at the same time. That would be like saying a coin is both head and tail at once, which is incorrect. Qubit. You can visualize a qubit like an arrow anchored to a fixed point, but it can rotate freely around that point. It's called a Bloch sphere. https://en.wikipedia.org/wiki/Bloch_sphere Entanglement is when you align the vectors of two or more Bloch spheres. Superposition is when the vector in a Bloch sphere is oriented other than straight up or down. A quantum gate "rotates" the Bloch sphere for a certain angle and in a certain direction, depending on the type of the quantum gate, or sometimes is "mirroring" the sphere. Once you made yourself familiar with the Bloch sphere, you can open this webpage and run an example or build your own quantum circuit https://algassert.com/quirk Quirk runs in a normal webpage, nothing to install, and has "live" visualization of the intermediary values of the qubits at each step of the quantum algorithm/circuit. Quirk is a quantum computer simulator, if you want a real quantum computer, you can make a free account to IBM-Q, and play with your own quantum circuits for free, either in simulation, or as a run on a real quantum computer. https://www.ibm.com/quantum-computing/ Also, you need to FORGET about the cursed expressions like "Schrödinger's cat" and "spooky action at a distance". Those are just wrong words used by journalist to confuse people and create hype. Also, "quantum teleportation" is not teleportation in the sens that one object disappear from where it is now , then appears later in some other place. "Quantum teleportation" is NOT teleportation. One last thing, the formalism of qubits and quantum gates and quantum circuits stays the same between various types of quantum computers, but the hardware of quantum computers varies widely. It's like C language stays the same either on paper, on a microcontroller or on multiprocessor server. The hardware of a quantum computer can be made in many ways, either with trapped ions, or with photons, or Josephson junctions, or phonons, or some other crazy construction. Also, to run a quantum computer you will need to control those ions/photons/junctions/whatever, so you will also need classic computer/s to "drive" the hardware of a quantum computer. |
| iMo:
It would be great if somebody with experience with the quirk webpage simulator would create a new topic, in for example General computing section (ie called "Quantum computing basics") and create an example with explanation on how to play with the simulation (or provides some hints how to proceed with those examples there). ::) |
| RoGeorge:
Quirk has instructions of how to use it https://github.com/Strilanc/Quirk/wiki/How-to-use-Quirk and a short video. |
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