cianfa72's latest activity
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cianfa72 replied to the thread I Action of an Hermitian unitary operator member of SU(2).No, I haven't. Maybe the fact that in any orthonormal basis the representative of the operator ##S \in SU(2)## , say ##\hat {S}##, has... -
cianfa72 posted the thread I Action of an Hermitian unitary operator member of SU(2) in Quantum Physics.QM uses separable Hilbert spaces as model to represent quantum system's states. Take for instance a 1/2-spin particle: its quantum pure...
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cianfa72 reacted to martinbn's post in the thread I Lie Derivatives vs Parallel Transport with
Like.
One reason is that the Lie derivative is not a good directional derivative. Reason being that at a point it doesn't depend only on the... -
cianfa72 reacted to PeroK's post in the thread I Entanglement: is there 'action at a distance' due to measurement? with Like.
It's conceptually clearer to describe this as a system of two particles in an entangled state. See below. Again, it's conceptually...
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cianfa72 replied to the thread I QM Qubit state space representation by Projective Hilbert space.Suppose to perform a Stern-Gerlach experiment to measure the spin of a spin-1/2 particle by orienting the equipment along the z-axis. In...
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The equivalence principle just says that you can't tell the difference between accelerating in deep space and standing on a planet, at...
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cianfa72 replied to the thread B Time dilation for two clocks at different altitudes on Earth.By static interval I believe you mean the segment of clock's worldline along a part of timelike static congruence. For instance...
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cianfa72 replied to the thread B Time dilation for two clocks at different altitudes on Earth.Exactly, I was referring to what you described (i.e. measuring frequency shift of a predefined frequency signal sent) as the physical...
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cianfa72 reacted to A.T.'s post in the thread B Time dilation for two clocks at different altitudes on Earth with Like.
Two meetings are required if the clocks are in relative motion at some point. If their arrangement remains static permanently (in some...
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cianfa72 replied to the thread B Time dilation for two clocks at different altitudes on Earth.I'd add that, since the two clocks involved are fixed at two different location A and B, "clock run faster" is not the same as twin...
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cianfa72 reacted to Ibix's post in the thread I How does GR deal with pointlike objects with mass? with Like.
The statement is that you can't tell the difference between being stationary on a planet's surface and being under acceleration in flat...
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cianfa72 replied to the thread I QM Qubit state space representation by Projective Hilbert space.Yes, I know quantum systems' states (pure & mixed) can be represented by density operators acting on abstract Hilbert spaces of relevant...
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cianfa72 replied to the thread I QM Qubit state space representation by Projective Hilbert space.Just to finalize: consider a physical experiment consisting of measuring the spin of 1/2 spin particle along the ##z##-axis. We can...
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cianfa72 reacted to SergejMaterov's post in the thread I QM Qubit state space representation by Projective Hilbert space with Like.
Exactly. All the physics lives on the projective space ##\mathbb C\mathrm P^1## (or Bloch sphere); ##\mathbb C^2## is just a convenient...
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cianfa72 replied to the thread I QM Qubit state space representation by Projective Hilbert space.Ok, so your point is as follows: take the set of qubit's pure states (this is a concrete set, namely the set of qubit's physical pure...