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Results tagged with quantum-entanglement
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user 12623
Quantum entanglement is the mechanism by which quantum correlations between two sub-systems survive even after being physically separated from an interaction region. The correlations could in principle survive without neither time nor space constraint.
4
votes
Accepted
Quantum circuit, two control not gates
Calculating the effect of the second CNOT gate works pretty much as the first one; you just have to carry the state of the third qubit along (this you actually do in case of the first gate with the fi …
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2
votes
Does the reduced density matrix describes a real mixed state?
When you have a system in the state $|\psi\rangle = a|01\rangle+b|10\rangle$ and take the partial trace over the subsystem B, you will find subsystem A in a mixed state as you say. When you measure th …
- 3,009
0
votes
Using quantum entanglement to send messages back to the past
I don't know what kind of experiment might work like that. The only thing that comes to mind is that it could somehow exploit the superluminal speed of wavefunction collapse to transmit information. B …
- 3,009
4
votes
Does measuring destroy entanglement
That depends on what kind of measurement you have in mind. Don't forget that often what is a measurement outcome from one point of view is a superposition from another. So some kind of superposition c …
- 3,009
3
votes
Understanding a Physics Paper on Quantum Teleportation of Continuous variables
I don't know the particulars of this paper, but in general, when teleportation in continuous variables is performed in quantum optics, some coherent state (or superposition of coherent states) is tele …
- 3,009
14
votes
Accepted
Is it possible for more than two particles to be entangled in a quantum way?
Yes, you can have as many entangled particles as you want. It might be rather cumbersome to achieve it but it can in principle be done. Multipartite entangled states actually lie at heart of a special …
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