Let me link the Wikipedia page for the record.
https://en.wikipedia.org/wiki/Quantum_Zeno_effect
Post in brf on May14 2018
Amber G. wrote: ↑15 May 2018 07:36 Sharing sad news - Eminent Physicist George Sudarshan (1931-2018) passed away. He will be fondly remembered as a guru to many of us. He was also a family friend.
I and few others discussed his contributions many times in Brf.
He was nominate 9 times for the Nobel Prize and at least twice it was unjustly denied to him. One of the most infamous case was Noble prize for quantum representation of light - known as Sudarshan-Glauber representation was given to Glauber only. Worse aspect of this was that the the work that the Noble committee cited for awarding was demonstrably Sudarshan's work. As many eminent scientists said at that time the Noble committee can choose it's recipient but it does not have the right to award a person for the work done by another. Shame on the Noble committee and the recipient for remaining quiet even after the facts became public.
(Around that time, I have posted many posts regarding that)
Apart from contributions to quantum optics, He discovered (with Marshak,the V-A theory of the weak interaction. This was independent of Feynman and Gell-Mann, and actually slightly before them. Feynman who got lot of credit for that actually gave credit to Sudarshan. (Again this has been discussed in BRF physics thread).
http://www.thehindu.com/news/national/k ... 884743.ece
ECG Sudarshan also came up with Tachyon (faster than light speed)! Sudarshan was also the first to propose the existence of tachyons, particles that travel faster than light. He developed a fundamental formalism called dynamical maps to study the theory of open quantum system.
Thanks. So the time quantization was proposed as a way to avoid the Zeno effect/ paradox? Basically avoiding division by zero?Vayutuvan wrote: ↑04 Oct 2023 05:46 Let me link the Wikipedia page for the record.
https://en.wikipedia.org/wiki/Quantum_Zeno_effect
This egregious mistake should make the Nobel committee (filled with swedes or is it the Deep State) to go hang themselves and drown in a norway fjords and become the sturgeon's meal. Tis the most blatant racist crap, if ever there was one, chutiyas. The rest of the physics world should have had firm "Shraddha" to oppose this and all of them should have enmass resigned their jobs as a mark of protest. Karma will get those in the Nobel committee one day and it will be really bad stuff.known as Sudarshan-Glauber representation was given to Glauber only. Worse aspect of this was that the the work that the Noble committee cited for awarding was demonstrably Sudarshan's work.
Reading through the second link. It seems it wasn't the laser itself which generated the attosecond pulses, it was the electrons within the gas. The laser was actually an IR (long wavelength) laser. The superposition of overtones from the electron transitions within the gas created the attosecond pulse trains.Amber G. wrote: ↑03 Oct 2023 18:50 The Royal Swedish Academy of Sciences has decided to award the 2023 NobelPrize in Physics to Pierre Agostini, Ferenc Krausz and Anne L’Huillier “for experimental methods that generate attosecond pulses of light for the study of electron dynamics in matter.”
Press release:
Popular information:
Advanced information
For the physics Nobel: ( Keep reading if interested in more technical details - but still keeping math etc symple)sudarshan wrote: ↑04 Oct 2023 19:10Reading through the second link. It seems it wasn't the laser itself which generated the attosecond pulses, it was the electrons within the gas. The laser was actually an IR (long wavelength) laser. The superposition of overtones from the electron transitions within the gas created the attosecond pulse trains.Amber G. wrote: ↑03 Oct 2023 18:50 The Royal Swedish Academy of Sciences has decided to award the 2023 NobelPrize in Physics to Pierre Agostini, Ferenc Krausz and Anne L’Huillier “for experimental methods that generate attosecond pulses of light for the study of electron dynamics in matter.”
Press release:
Popular information:
Advanced information
So the idea is to analyze the pulse train to infer the motion of the electrons within the gas? Or is the pulse train going to be used to probe some other sample?
FWIW: (Just for fun - Units mentioned in Suryashidanta etc..)
I decided to put in in Physics dhaga -- as many of us are saying that there are six nobel prize winners in Physics this year...
From what I know - Meter is indeed derived from the Greek "metreos," meaning measure. While it's an interesting connection, there's no direct evidence (at least I know) to confirm if "metreos" has a Sanskrit origin in "maatra." ..The metric system's roots lie in French efforts to standardize measurement during the late 18th century, making it an important French contribution.
Visiting the Musée des Arts et Métiers is no doubt intriguing from a historical perspective, but scientifically, it represents a piece of history. The standard 'meter' was retired long ago, and the 'kilogram' has been redefined. In fact, measurements like the second, meter, and kilogram have all been redefined with more precise and robust definitions, no longer reliant on physical museum artifacts.If you happen to visit Paris, make a trip to "Musée des Arts et Métiers" - which is a fantastic collection of scientific instruments over many centuries.
From what I learned - it means measure of any small quantity ....
STOP playing the victim! /sigh/
The US Office of Naval Research has provided $100,000 in funding for LK99 room temperature ambient pressure superconducting research at Chapman University.
* More description of the vapor deposition process that makes the micron(s) thick thin film which is the only material claimed to be superconducting
* They claim they get 48.9% of the lead apatite thin film as superconductive. There is also lead compounds (40%) and Copper compounds (10%).
* The new description includes some silicon in the process
* lead apatite itself is an insulator and the korean team says they need doping and defects to make it into a superconductor
* The superconductor consists of lead apatite of phases with three different critical temperatures of Tc, I~50C, II~80C, III~125C
* In thin film, only Tc I, II were seen with resistance measurement
* they say there is diamagnetism and ferromagnetism. They say both of these are intrinsic to the mixture
* they say the Meissner effect is underneath the diamagnetism and ferromagnetism. They provide the method to measure the superconducting features
* Scanning Electron Microscope pictures of all the important phases in both methods
* much more detailed measurements and graphs
Solid State Synthesis
– they’ve described this before, but now include a little Silicon in the mixture. But they don’t say how the Si got in there!
– They claim they get 48.9% lead apatite which is superconductive, with two other lead compounds (40%) and Copper compounds (10%).
– However lead apatite itself is an insulator, they say they need doping and defects to make it into a superconductor
– I am still not clear where in the solid state process the superconductor emerges.
For both methods
– The superconductor consists of lead apatite of phases with three different critical temperatures of Tc, I~50C, II~80C, III~125C
– In thin film, only Tc I, II were seen with resistance measurement, while Tc II and III were seen with magnetic susceptability measurement due to higher sensitivity
Magnetism
– they admit diamagnetism, they admit ferromagnetism. They say both of these are intrinsic to the mixture
– they say the Meissner effect is underneath these, and they provide the method to measure it
– the secret is a very low magnetic field generated by the SQUID, while heating and cooling the material
– this allows detection of the expulsion of the flux by the superconductor
Our work demonstrates that non-locality is a viable new resource in quantum information technology realized with superconducting circuits with potential applications in quantum communication, quantum computing and fundamental physics
Okay Amber ji - when I saw the following, I rushed here to show it to you, because I'd be very interested in your opinion on this.