Questions tagged [quantum-mechanics]

Question 1

This is my second attempt at this question, the first one got deleted because my question was lacking detail. My knowledge of this subject comes entirely from these two sources: Nimrod Moisyevitch, ...

Question 2

The equations of classical physics are time reversible -- unchanged when t is replaced by -t. The Schrodinger equation in quantum mechanics is time reversible -- unchanged when t is replaced by -t ...

Question 3

How to calculate any expectation value from path integral in quantum mechanics? In QM path integral the initial and final points are fixed and points between them are varied. But as far as i ...

Question 4

I need to numerically generate colored noise with a Power Spectral Density (PSD) $S(\omega,T) \propto \coth(\omega/T)$ (quantum thermal noise). I cannot use standard Spectral Synthesis (Inverse FFT) ...

Question 5

I understand how Ehrenfest is sort of giving a correspondence between classical and quantum whereas von Neumann is more like a quantum mechanical equivalent of Liouvilles equation. But do they share ...

Question 6

We can embed the spinors of a Clifford algebra into the Clifford algebra itself by representing them as a minimal left ideal. I'm looking at the case of 3D space where a chosen basis satisfies $e_1^2=...

Question 7

The typical expectation value formula given most places is $$\langle A \rangle_\psi = \langle\psi|A|\psi\rangle.$$ this assumes that the state is normalised. For unnormalised states the formula is $$\...

Question 8

Interested to calculate TDM of a molecule in the presence of a dielectric. What is the go-to way right now in research circles?

Question 9

Lookin for a way to run quantum circuits with de-polarizing noise via quantum trajectories and not density matrix

Question 10

Consider an operator like the modular Hamiltonian $K$ defined by $$\rho=e^{-K}$$ where $\rho$ is some (reduced) density matrix. So $K$ depends non-linearly on $\rho$ in general. It can be shown that ...

Question 11

Imagine C has positive formal charge bonded to three methyl groups (CH3). How do we compute the overlap between sigma bond and empty $p$-orbital? The motivation for this is to show how energy ...

Question 12

In classical mechanics we say that a classical particle obeys the equations of motion, whereas in quantum mechanics a particle can take any path, not just the classical one. But when we quantize a ...

Question 13

I'm having trouble understanding how two entangled particles stay correlated once they are measured. As an example, if they are anti-correlated in their spins, and one particle is measured to have a ...

Question 14

Im an 7th grader so I request everyone who are answering this question please give answer in simple words. A electron is spin up and the other electron is spin down then suddenly how does the electron ...

Question 15

I'm trying to publish this paper about a Quantum Gravity using the atomic nucleus, but by now the answer is it's controversial. What do you think? https://www.researchgate.net/publication/...

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Questions tagged [quantum-mechanics]

Question about self-orthogonality in non-Hermitian systems [duplicate]

Irreversibility of wave function collapse

Path integral in quantum mechanics and expectation values

Time-domain algorithm to generate noise with Power Spectral Density (PSD) $S(\omega,T) \propto \coth(\omega/T)$ sequentially

Is there a connection between Ehrenfest equation and von Neumann equation? [closed]

Are the involutions defining spin in the 3D Clifford algebra the vectors or the bivectors?

Why the Expectation Value of a unnormalised state $|\psi\rangle$ is $\langle A\rangle_\psi=\frac{\langle\psi|A|\psi\rangle}{\langle\psi|\psi\rangle}$? [closed]

How to calculate transition dipole moment computationally? [closed]

Is quantum channels can be simulated via quantum trajectories? [closed]

Why can't we measure non-linear operators in QM using single shot measurements?

Overlap integral in quantum chemistry [closed]

Classical mechanics vs quantum mechanics [closed]

How do entangled particles stay correlated if they do not interact with each other at measurement?

How does an Particle changes spin like other particle randomly, how do they give information to each other? [closed]

A Nuclear Quantum Gravity [closed]

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