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Results tagged with quantum-computer
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user 28512
The quantum computing tag is relevant for computing that uses quantum states such as superposition and/or entanglement to locate low energy states as solutions to complex problems (rather than laboriously enumerating and checking solutions as would be done with non-quantum traditional computing).
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determinism, and quantum computing
Quantum mechanics does not contradict determinism. The relevant equation of motion is something like the Heisenberg equation of motion which predicts how observables change over time. Those observable …
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How Are Quantum Computers Able to Store Any Data at all?
What does it mean to say that a system can be used to store information? It means you can change the state of the system so that if you look at it you will find out something you may not have known be …
- 10.2k
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How do we know WHEN to get the result from quantum computers?
As explained on page 7 of Deutsch's first paper on quantum computation, you can set aside one of the qubits of the computer as a flag for completion of the computation. The qubit starts with the value …
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Does processing for a quantum computer take place in other universes?
"Assuming the multiverse interpretation of quantum mechanics is correct, does this mean that a quantum computer is capable of considering all possible solutions to a problem simultaneously because it …
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What's Bob's state after this quantum circuit?
You seem very confused. You can work this one out without using density matrices and density matrices would only add complexity in this case, so you should avoid them in this particular problem. To fi …
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Why does this not break the security of quantum teleportation
I am going to assume in this answer that you're concerned about the security of quantum cryptography not teleportation.
You say that Eve gives Alice and Bob the following state:
$$|\Psi_{ABE}^-\rangle …
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Can existing quantum computers be considered evidence for parallel universes?
The debate over evidence for the many worlds interpretation is largely misconceived. Suppose that you take quantum mechanical equations of motion seriously and apply them to all physical systems, incl …
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How is quantum teleportation possible when there's a continuum of possible states to send over?
What is missing in the derivation you looked at, and in most discussions of entanglement, is a discussion of how information is transferred from one member of the entangled pair of qubits to the other …
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Does quantum computing rely on particular interpretations of quantum mechanics?
Would this mean that quantum computing is impossible in interpretations of quantum mechanics in which qbits are not in reality existing in all states simultaneously until observed? Thus, wouldn't qua …
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What is the decoherence time scale for the most promising quantum computing implementations?
There is a review called Quantum Computing: A Taxonomy, Systematic Review and Future Directions by Gill et al. has a table of quantum computing implementations including coherence times and gate opera …