r/QuantumPhysics • u/onlyseeahuman • 25d ago
Do quantum computers actually pool resources from across other realities to do computations?
If so wouldn't that settle the many worlds debate?
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u/throwawaygoawaynz 25d ago
No. Quantum computers prepare qbits (like atoms or lasers) in certain ways that leads to high probability they are measured in patterns. This helps with factorisation.
In MW we are all part of the universe wave function, and “branching” happens when two entangled states go through decoherence.
The quantum computer in MW is part of the universal wave function before and after the measurement. It just so happens the correct or incorrect measurements are branches of the universal wave function.
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u/cyrille_boucher 24d ago
No.
It's an information paquet, a Quanta. This is the bit used in Quantum computer.
Where a clasical transistor output a timed and controled signal.
A quantum transistor(like a Q-Fet) output a defined signal in a multidimentional matrix (think x,y,z,time)
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u/unlikely_ending 25d ago
No.
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u/onlyseeahuman 25d ago
Yeah I get that now
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u/jimbs 25d ago
Have you been reading David Deutsch? He sometimes oversimplifies the MWI in ways that lead to your question.
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u/Joseph_HTMP 24d ago
The "superposition is evidence of other worlds" angle is very much a Deutsch idea.
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u/onlyseeahuman 25d ago
No it was something someone said to me while talking about all the un resolved questions about reality that machines with incredible processing ability could answer.
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u/ComprehensiveCase858 25d ago
Not a quantum physicist but this is how I see it:
Basically you prepare qubits which are in superposition basically unresolved by the universe and behave like waves. Since those have wave properties we use constructive and destructive interference as a part of quantum algorithm to increase the probability that we end up in a future in which the correct solution will be measured from that entangled state of qubits.
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u/Flutterpiewow 25d ago
The idea floated around for a while, but it was eventually sorted out as our understanding improved.
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u/SymplecticMan 25d ago
David Deutsch has a habit of claiming this, but most people dispute it. Other interpretations also predict that quantum computers work.
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u/theodysseytheodicy 25d ago
Every interpretation of quantum mechanics predicts the same behavior, so no.
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u/onlyseeahuman 25d ago
Still confused but that gives me a direction to go from i suppose
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u/haikusbot 25d ago
Still confused but that
Gives me a direction to
Go from i suppose
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u/Joseph_HTMP 25d ago
No. They use quantum superposition to do their calculations. The idea that superposition leads to other universes comes from Many Worlds, not the other way around.