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Results tagged with quantum-mechanics
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user 106192
Quantum mechanics describes the microscopic properties of nature in a regime where classical mechanics no longer applies. It explains phenomena such as the wave-particle duality, quantization of energy, and the uncertainty principle and is generally used in single-body systems. Use the quantum-field-theory tag for the theory of many-body quantum-mechanical systems.
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Quantum mechanics interpretation clarification
Tegmark is claiming that the scientist who evolved inside of the otherwise isolated Andromeda system qualifies as an observer; and since there is an observer, the system as a whole is being observed, …
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Double-slit experiment, coloured slits
Electrons don't have colors; however, you could alter the spin. In this case the interference would vanish.
For an interesting presentation by an expert, read the Feynman Lectures on Physics, vol II …
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Does the number of photons reduce after hitting the wall in the photon by photon double slit...
Calibration of the detector with a well characterized source permits the quantum efficiency of the detector (camera) to be determined. Some losses are geometric: the active area of each pixel may not …
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How Are Quantum Computers Able to Store Any Data at all?
With quantum computers, as with classical computers, the initial states (variables) are set at the beginning of the process.
Suppose you write an ordinary computer program to find the largest prime n …
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Can we obtain interference pattern with single electron/photon in Young's double slit experi...
G.I. Taylor did the first such experiment in 1909; see https://en.wikipedia.org/wiki/G._I._Taylor
And yes, the statistical pattern of many repetitions shows interference.
The same result holds for s …
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What does the continuity equation for probability in quantum mechanics mean?
The simplest version refers to a single particle. It may be more obvious in integral form: apply the Stokes theorem. The the equation states that the time derivative of the probability of the particle …
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How exactly do we know how should transformations of vectors of Hilbert space look like?
The quantum theory has a long history, and reaches its first maturity with the papers of Heisenberg and Shroedinger which present their equations which show how a quantum system evolves with time.
Th …
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Explaining The Quantum Mechanics Weirdness
You asked for an academic critique; so this is what I would say to the editor if this were submitted to me for review:
This essay is primarily philosophical, and makes assertions about time, but prov …
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What would diffraction of a macroscopic object look like?
During the total solar eclipse of 10 May 1994, in Michigan, when you looked at the ground under a nice bushy maple tree you could see a crescent shaped image of nearly eclipsed sun on the ground -- l …
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Number of photons through glass
In the world of linear optics we assume that $T+R+A=1$, Transmitted, Reflected, Absorbed. For optical glass absorptance is very low, so set $A=0$.
This leads us to the result described in the commen …
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Why do shiny surfaces reflect more light than other surfaces?
A clean metallic surface appears shiny because it is reflecting light. The interaction is due to the conductivity of the surface of the metal.
When surface conditions change, the reflectivity is redu …
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Difference between Amplitude and Intensity Interferometer?
Hanbury Brown and Twiss effect is the correlation between intensities measured simultaneously by independent detectors. It was first used with radio astronomy, and after Twiss provided the mathematics …
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Under what conditions does a beam splitter entangle two input photons?
The articles by Chris Monroe describe the following situations: (1) use of an already entangled pair of photons to transfer the entanglement, resulting in ion-ion entanglement; (2) interference of pho …
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Can conducting electrons in a metal be modeled at all as classical particles?
The Drude model (1900) is based on statistical mechanics plus Maxwell's electrodynamics as updated by Lorentz to include the electron and atoms.
It gives good results for some processes, such as cond …
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Under constant light intensity frequency, do electrons emitted from a metal surface travel a...
There are several factors which determine the energy acquired by a photo-electron:
the structure of the crystal surface determines the work function, which means that (111) surface is different from …
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