Tuossa on kvanttifysiikan nobelistien luento nobel komitealle.
https://en.wikipedia.org/wiki/Josephson_junction
https://en.wikipedia.org/wiki/Quantum_tunnelling
https://simple.wikipedia.org/wiki/Superconductor
https://en.wikipedia.org/wiki/Alpha_decay
https://www.typhoon-hil.com/documentati ... nents.html
A tilted cosine potential, also called a tilted washboard potential, is a physical model that combines a periodic cosine function with a linear slope. It is written as \(U(x) = -Ax - B \cos x\).You can read more about its behavior and pedagogical uses in the study on the Tale of Tilted Washboards of Potential Energy.
Key States of the System
Locked state: The tilt is small, creating local energy wells where a particle or phase can stay trapped.
Critical tilt: The slope matches the steepness of the cosine wave, turning the wells and peaks into flat inflection points.
Running state: The tilt is large, removing all wells and letting particles move freely down the slope.
Main ApplicationsJosephson junctions: Models the superconducting phase difference and voltage states in electronic circuits.
Brownian motion: Explains how particles diffuse, drift, or hop over barriers when exposed to thermal noise.
Superconductivity: Helps describe magnetic vortex pinning and ratchet effects in films.Explore advanced spatio-temporal dynamics in the paper on arXiv.
https://en.wikipedia.org/wiki/Planck%27s_law
Lisää:
Photon states are generated primarily through nonlinear optical processes like parametric down-conversion or by using on-demand single-photon emitters like semiconductor quantum dots.
Key Methods for Generating Photon States
Parametric Down-Conversion (PDC): A high-energy pump laser splits into pairs of correlated photons (signal and idler) inside a nonlinear crystal, enabling the creation of specific photon number (Fock) states or entangled pairs.
Spontaneous Four-Wave Mixing (FWM): Uses a strong pump field in a third-order nonlinear medium to spontaneously generate photon pairs from vacuum fluctuations.
Semiconductor Quantum Dots: Emit single photons or sequential polarization-encoded linear cluster states on demand via radiative recombination and controlled optical pulses.
Heralded Generation: Detects an ancillary (partner) photon to verify and "herald" the successful creation and availability of the target photon state in the corresponding spatial or temporal mode.
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