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Bookmark or Share- What Planck Length Is and It’s Common Misconceptions - Physics ForumsThe Planck length is a distance constructed from physical constants and is 10–35 meters. It is the length scale at which quantum gravity becomes relevant. There is a misconception that the universe comprises Planck–sized pixels, but this is incorrect. It is an important order of magnitude when discussing quantum gravity, but it is not the ...
- Quantum Physics via Quantum Tomography: A New Approach ... - Physics ForumsThis notion generalizes the polarization properties of light: In the case of the polarization of a source of light, the density operator represents a qubit and is given by a ##2\times 2## matrix whose trace is the intensity of the light beam. If expressed as a linear combination of Pauli matrices, the coefficients define the so-called Stokes ...
- Schrödinger’s Cat and the Qbit - Physics ForumsAnything with a 2-dim Hilbert space is a qubit " As an approximation for analyzing particular experiments, this can work ok–basically you are ignoring all the other degrees of freedom of the particular system (buckyball, silver atom in an S-G experiment, etc.) because you have set up the experiment so those degrees of freedom, to a good enough approximation, do not affect the outcome.
- Understanding Z2 Symmetry in Models - Physics ForumsZ2 symmetry is relevant in models because it can simplify and constrain the behavior of a system. By imposing Z2 symmetry, certain interactions or terms in the model can be forbidden, leading to a more elegant and predictive model. Z2 symmetry is commonly used in particle physics, condensed matter physics, and other fields of physics.
- Local mechanism for nonlocal anticorrelations inside spin theoryIf Alice and Bob each measure an entangled qubit, Bob's expectation value for a given measurement (i.e., a given angle he chooses for his measuring device to measure the spin of the qubit), taken in isolation, i.e., without any knowledge of Alice's measurement, is the same regardless of what measurement Alice chooses to make on her qubit.
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