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Physics

Questions tagged [quantum-mechanics]

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Quantum mechanics describes the microscopic properties of nature in a regime where classical mechanics no longer applies. It explains phenomena such as the wave-particle duality, quantization of energy, and the uncertainty principle and is generally used in single-body systems. Use the quantum-field-theory tag for the theory of many-body quantum-mechanical systems.

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I try to immagine the hadamard gate on a bloch sphere and it is obvious that it is the sum of the pauli $x$ and $z$ gate matrices.So that means we rotate the "vector" around the x axe and ...
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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, ...
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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 ...
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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 ...
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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) ...
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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 ...
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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=...
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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$$\...
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Interested to calculate TDM of a molecule in the presence of a dielectric. What is the go-to way right now in research circles?
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Lookin for a way to run quantum circuits with de-polarizing noise via quantum trajectories and not density matrix
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Consider an operator like the modular Hamiltonian $K$ defined by $$\rho=e^{-K}$$ where $\rho$ is some (reduced) density matrix. So $K$ depends non-linearly on $\rho$ in general. It can be shown that ...
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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 ...
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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 ...
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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 ...
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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 ...

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