I Introduction to Quantum Mechanics

Bilal Rajab Abbasi
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Hi! I am Bilal Rajab.
I have a question regarding Quantum Physics.
From where can we learn about Quantum Physics and what is its relation to Classical Physics?
Why is there not one single Physics...?
Thanks
Regards,
Bilal Rajab Abbasi
 
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Bilal Rajab Abbasi said:
Hi! I am Bilal Rajab.
I have a question regarding Quantum Physics.
From where can we learn about Quantum Physics and what is its relation to Classical Physics?
Why is there not one single Physics...?
Thanks
Regards,
Bilal Rajab Abbasi

Try this:

 
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Bilal Rajab Abbasi said:
Hi! I am Bilal Rajab.
I have a question regarding Quantum Physics.
From where can we learn about Quantum Physics and what is its relation to Classical Physics?
Why is there not one single Physics...?
Thanks
Regards,
Bilal Rajab Abbasi

Here in the US, at various points along the many thousand of miles of US highway systems, there are "weighing stations" that weigh commercial trailer trucks, to make sure they are not overweight and become a safety hazard. Now, do you think these weighing machines can also weigh chemicals in the sub milligrams scale with the needed accuracy? If you drop a grain of sand on such a scale, do you think it will even make a difference on its reading? You have to switch to a more accurate weighing scale, which will have greater accuracy, but you sacrifice the range of weights that you can now measure. A chemical balance is certainly not the equipment you would use to weight a truck, or even a potato.

In other words, you use the proper instrument to do what you want.

There actually is just ONE single physics. But it has many different loose sub-areas. It also means that they are all inter-related and connected. There are forms and mathematics that look similar or even identical in different areas of physics. This is why the study of magnetism and superconducitivity in condensed matter physics gave birth to the Higgs mechanism in elementary particle physics.

This is why students usually get an undergraduate degree in "Physics", not in Classical Physics, not in Quantum Physics, not in Electromagnetism, etc... A physicist is expected to know the basic knowledge of all the fundamental areas of physics, not just one.

Zz.
 
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Not an expert in QM. AFAIK, Schrödinger's equation is quite different from the classical wave equation. The former is an equation for the dynamics of the state of a (quantum?) system, the latter is an equation for the dynamics of a (classical) degree of freedom. As a matter of fact, Schrödinger's equation is first order in time derivatives, while the classical wave equation is second order. But, AFAIK, Schrödinger's equation is a wave equation; only its interpretation makes it non-classical...
Insights auto threads is broken atm, so I'm manually creating these for new Insight articles. Towards the end of the first lecture for the Qiskit Global Summer School 2025, Foundations of Quantum Mechanics, Olivia Lanes (Global Lead, Content and Education IBM) stated... Source: https://www.physicsforums.com/insights/quantum-entanglement-is-a-kinematic-fact-not-a-dynamical-effect/ by @RUTA
Is it possible, and fruitful, to use certain conceptual and technical tools from effective field theory (coarse-graining/integrating-out, power-counting, matching, RG) to think about the relationship between the fundamental (quantum) and the emergent (classical), both to account for the quasi-autonomy of the classical level and to quantify residual quantum corrections? By “emergent,” I mean the following: after integrating out fast/irrelevant quantum degrees of freedom (high-energy modes...

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