B What are the practical applications of QM and QFT?

mieral
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Please list all the practical applications of QM and QFT the way you know from memory.. so far the following is what I know.

Practical applications of QM:

1. Understanding the double slit experiment
2. What else? Please enumerate

Practical applications of QFT:

1. Solving for the Magnetic Moment of the Electron
2. What else? Please enumerate
 
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mieral said:
Practical applications...
Well, seeing as how chemical bonding is a quantum-mechanical phenomenon...
Most or all of chemistry, most or all of microelectronics, most or all of solid state physics.
 
mieral said:
Please list all the practical applications of QM and QFT the way you know from memory..

It might be easier to list things that aren't practical applications of QM and QFT. :wink: Maybe tracking asteroids, since that doesn't involve analyzing their internal structure. But if, for example, we had to send a space mission to divert an asteroid that might come too close to Earth, we'd need QM (in the form of chemistry and analyzing chemical bond energies) to help us find the optimal rocket fuel, and to make the onboard computers work, and for communications, and...
 
I know almost all use QM or QFT.. I'd just like to understand their domain of applicability of each. For example. You don't use QFT on computing for trajectories of an object. You use Newtonian physics. So what applications where you can still use Schrodinger Quantum Mechanics. As I understand and I think everyone else. Quantum Mechanics means the plain Schroedinger Equation. While QFT is beyond QM.
 
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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