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Join in expert discussion on quantum physics. Quantum physics is the mathematical description of the motion and interaction of subatomic particles. Quantum Mechanics and Field Theory.

Quantum Interpretations and Foundations

I Question about discussions around quantum interpretations
B Is General Relativity Merely a Classical Framework for Calculations?
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Why does expectation values are always nonnegative?
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I What turns energy into matter and vice versa?
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I Understanding Schrodinger's cat
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I A quantum system under constant observation
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Particle in a box in momentum basis
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B The position of a particle/electron question
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B What would happen if a wave function disruptor was used on a table?
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I The speed of a "photon" in a multipath experiment?
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I Quantum decoherence superposition of macroscopic object
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B Does Rejecting Realism in Quantum Mechanics Ensure Consistent Predictions?
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B Is wave / particle duality linked to superposition?
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A Effect of visible light on conductivity
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I Understanding the Delayed Choice Quantum Eraser Experiment
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A Approximating a QF with finite-dimensional Hilbert space
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I Still confused about (anti)symmetrization of wavefunctions
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I What is the energy due to Spin?
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I Delayed choice two slit experiment - photon
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I Finding components in momentum representation
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I Two Identical non-entangled Particle System
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I 'speed' of spooky action vs delayed choice
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B Bell's state measurement in the Bell basis
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I Double slit experiment question
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I Delayed choice - Bohr's experiment with a Camera
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I Is space infinitesimal? Can it be divided unlimited times?
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A Atomic Orbitals and Symmetry
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I Question about double slit experiment results
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I Help to understand the wave function for atom (gas)
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B A question about Electron spin
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I Uncertainty Principle.... Intent Behind It?
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B Dirac Equation vs. Schrodinger Equation
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B Still confused about superposition and mixed states
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A Is entanglement based on first principles?
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I No problem at all, happy to help! Have a great weekend as well.
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B Quantum Mechanics: Origin of the Term & Why Mechanics?
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B Is the Higgs Field Uniform Across Space-Time or Does It Vary?
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I How are different potentials implemented experimentally?
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A Srednicki's QFT: Feynman Rules and Feynman Diagrams
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I Double Slit Experiment: Magnification?
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A Is this experiment real (double slit)?
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B The Firewall Paradox: Is it Possible?
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I How can larger dips in absorption line give more element
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B Quantum Entanglement. Is spin conserved?
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I Why is association rule in angular momentum sum not valid?
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I Interpret Heisenberg Picture: Operators & States
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Why the particle velocity in Dirac theory is equal to c?
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B Meaning of the word 'instantaneous'
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I Feynman Lectures: negative alpha for solving Schrödinger equation
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I High Energy Photon Recieved as Lesser Energy Photons?
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A Wavefunction matching two different H, not just V
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I Delayed choice, pseudo-retrocausality, massive particles
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I Particle number conservation and motivations for QFT
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I Zeeman effect sign of circular polarization
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A What is the physical significance of the unitary matrix in this optical device?
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I Why are total orbital QN l,m zero for closed subshell?
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B Is the wave function physical ?
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B Accuracy in speed of photon - uncertainty?
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I Evalutaion of Schrodinger's equation
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I Comments on updated delayed choice erasure graphic
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B Why is momentum the fourier transform of the wavefunction ?
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B What is the origin of Observables?
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B An application of the uncertainty principle
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I How can you visualize the Higgs field, or can you?
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I Spontaneous Absorption of Photons in Two State Quantum System
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I Finding probability of changing states
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A How to understand the electric-field operator?
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B Polytropic process with heat addition
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I Could you provide me a selection rule?
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I What is a time-dependent operator?
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B Understanding Different Quantum Interactions
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I Confused about operator action
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I Defining a pulse of particular area
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A Fock space and Poincaré invariance
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I Mind Bending Double-Slit Diffraction Thought Experiment
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B Is Gravitational Quantization Supported by the Stability of Orbital Electrons?
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I Understanding Space-Time & Fields: A Flowchart Guide
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B Neutrinos and Fermi-Dirac Distribution
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I What is the reason behind uncertainty principle?
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B What is the reason for Schrodinger's cat experiment?
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A Interpreting the K-G Annihilation Operator Expression
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I Can a Discontinuous Wave Function Be Acceptable in Quantum Mechanics?
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I Understanding ΔEΔt uncertainty
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I Understanding Internal State in Quantum Systems with Cold Atoms
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B Understanding Correlations in Non-Realism: The Role of Extra Variables?
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B Wave Function of a Proton in a Box with a Slide
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A QFT and transitions between momentum states
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B Is Wigner's Friend the Key to Understanding Wave Function Collapse?
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I The Lagrangian of a Coherent State
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B Should Fourier Transforms Be Taught Before the Heisenberg Uncertainty Principle?
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B How does Bell's inequality rule out realism?
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I Field eigenstates and path integral formulation
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A Conjugate variable clarification
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I Time evolution after "turning off" square well
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I What is the angle in the action-angle uncertainty principle?
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B Other terms for indeterministic hidden variables
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I Two photon absorption or multi-photon absorption?
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B Why is probability defined in space rather than at a point in quantum mechanics?
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B Is an Electron Both a Wave and a Particle Simultaneously?
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I Quantum Superposition While Observing Phenomena?
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B Energy density of charged capacitor via QFT
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Quantum Physics

Quantum physics, or quantum mechanics, is a branch of physics that explores the behavior of matter and energy at the smallest scales, where classical physics principles break down. It introduces the concept of quantization, suggesting that certain properties, such as energy levels, are quantized and can only exist in discrete values.

Quantum mechanics encompasses wave-particle duality, where particles like electrons exhibit both wave and particle characteristics. The theory is probabilistic, relying on probability amplitudes to predict outcomes, and features phenomena like superposition, where particles can exist in multiple states simultaneously.

Quantum physics has transformed our understanding of the microscopic world, leading to technologies like transistors and lasers, and continues to provoke profound questions about the nature of reality and the role of observation in shaping it.

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