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Nov
21
comment Glueball mass in non-abelian Yang Mills theory
Cause I'm studying these things and there are not clear references... why?
Nov
20
asked Glueball mass in non-abelian Yang Mills theory
Nov
15
awarded  Scholar
Nov
15
accepted Yang Mills Hamiltonian: why do we use the Weyl's temporal gauge?
Nov
15
awarded  Student
Nov
15
asked Yang Mills Hamiltonian: why do we use the Weyl's temporal gauge?
Nov
14
awarded  Citizen Patrol
Nov
12
comment Classical Communication in Quantum Teleportation
@Ondřej Černotík So you are telling that if I want to teleport an input qubit, classical communication can be implemented also sending a qubit, provided that Bob measures it in the right basis. So why in this case Alice should not send directly her input qubit to Bob?
Nov
12
comment Classical Communication in Quantum Teleportation
@Ondřej Černotík So classical does not mean that you are not sending superposition (because in your case you are sending superposition), but it means that Alice communicates to Bob in a common language (in your example the choice of the basis). Isn't it?
Nov
12
comment Classical Communication in Quantum Teleportation
@Ondřej Černotík The fact that a photon is a vertical or horizontal polarization it depends strongly from which basis you are measuring: $|H\rangle=\frac{|H\rangle+|V\rangle}{2}+\frac{|H\rangle-|V\rangle}{2}$, and changing basis you get $\frac{|phi\rangle+|\phi^\bot}{\sqrt{2}}$. So what are you telling depends strongly from an universal protocol that Alice and Bob knows, e.g., in your case, in which basis you have to measure to retrieve the information that Alice wants to send to Bob.
Nov
12
comment Classical Communication in Quantum Teleportation
I will try to go deeper in the question thanks to these comments. When you are sending 0 or 1 from Alice to Bob, in practice Alice is sending an electromagnetic field (used in standard communication), which is converted to a number by Bob using universal protocols (the one in our computers for instance). In this picture, what is the classical feature? The fact that we are sending a classical electromagnetic field? If yes, what if we send something that is not clear if it is classical or not classical?
Nov
12
revised Where is noncommutativity in the state-effect formalism of quantum mechanics?
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Nov
11
awarded  Supporter
Nov
11
revised Does uncertainty imply noncommutativity?
added 4 characters in body
Nov
11
revised Is the density operator a mathematical convenience or a 'fundamental' aspect of quantum mechanics?
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Nov
11
revised Why do they call it quantum teleportation?
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Nov
11
revised Classical Communication in Quantum Teleportation
added 8 characters in body
Nov
11
answered Why do they call it quantum teleportation?
Nov
11
asked Classical Communication in Quantum Teleportation
Nov
11
comment Where is noncommutativity in the state-effect formalism of quantum mechanics?
Let assume that your measurement device is not disturbing our system. In this case measuring $A$ and then $B$ is not the same as measuring first $B$ and then $A$. Mathematically because the two observable does not commute. Physically because if you make experiment, effectively you will get different results in some case. If your problem is that the experimental device is disturbing the system, in many cases you can design a scheme to implement a measurement without disturbing this. These kind of measures are called Quantum Nondemolition Measurement.