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I haven't read the article but the point is that a quantum computer is not a simulation of a quantum system, it is completely a quantum system. If you can prove

I haven't read the article but the point is that a quantum computer is not a simulation of a quantum system, it is completely a quantum system. If you can prove that the dynamics and states of your qubits can be mapped onto the system you want to simulate, then it is physically equivalent, not just a perfect simulation of it. In a sense, the word simulation is a bit too weak to describe what is actually going on here, possibly the phrase "more convenient example" would be more accurate

gus_massa 3y ago
It's more like using an electrical circuit to make an analogic simulation of a spring with a mass (or a pendulum). You get the same simplified equation, but each one has different nasty corrections. In the case of an electric circuit, you are usually ignoring radiation, thermal noise, ... In the spring and mass you are usually ignoring the non linear part of the spring, air viscosity, tidal forces of the moon, ...
- bowsamic 3y ago
  A quantum example of that is how the light in a cavity is exactly the same as the mass on a spring but with a temperature independent "thermal noise", but only if you consider just one mode of that spring, ignore non-linear stuff, etc.
- marcosdumay 3y ago
  It's like using an electrical circuit to make an analog simulation of the behavior of an arbitrary resistor-capacitor circuit. You can get a lot of flexibility from all the extra stuff you have controlling your simulator, but the simulator is essentially the same thing it is simulating. You don't have to ignore anything.
jxramos 3y ago
interesting, some kind of induced physical analogue, or induced physical form or something mirroring, behavioral state mirroring, physical state mirroring, yes what do we call this phenomena. Has almost the feel of how wave energy can be found in all sorts of media, fluid, sand, gas, etc.

gus_massa 3y ago

It's more like using an electrical circuit to make an analogic simulation of a spring with a mass (or a pendulum). You get the same simplified equation, but each one has different nasty corrections. In the case of an electric circuit, you are usually ignoring radiation, thermal noise, ... In the spring and mass you are usually ignoring the non linear part of the spring, air viscosity, tidal forces of the moon, ...

bowsamic 3y ago
A quantum example of that is how the light in a cavity is exactly the same as the mass on a spring but with a temperature independent "thermal noise", but only if you consider just one mode of that spring, ignore non-linear stuff, etc.
marcosdumay 3y ago
It's like using an electrical circuit to make an analog simulation of the behavior of an arbitrary resistor-capacitor circuit. You can get a lot of flexibility from all the extra stuff you have controlling your simulator, but the simulator is essentially the same thing it is simulating. You don't have to ignore anything.

jxramos 3y ago

interesting, some kind of induced physical analogue, or induced physical form or something mirroring, behavioral state mirroring, physical state mirroring, yes what do we call this phenomena. Has almost the feel of how wave energy can be found in all sorts of media, fluid, sand, gas, etc.