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.
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Graduate Questions about measurement of a particle in superposition
- entropy1
- · Replies 14 ·
Graduate How is this equation for <x|P|x'> derived?
- baouba
- · Replies 8 ·
Undergrad What is the true nature of a photon's collapse?
- wavepax
- · Replies 3 ·
Graduate Classical channel vs quantum channel
- aaaa202
- · Replies 2 ·
Graduate Realism vs Locality in Quantum Entanglement
- Markus Hanke
- · Replies 41 ·
Graduate Exploring E-e Repulsion: Stability of Half and Full P Sub-Shells Explained
- htneT
- · Replies 5 ·
Undergrad Do photon apply a force to the electron ?
- big_bounce
- · Replies 11 ·
Graduate Problem understanding Wigner's 1939 paper
- facenian
- · Replies 4 ·
Graduate Superposition in relation to Counter factual definiteness
- quantumphysics11
- · Replies 3 ·
Graduate Long-distance correlation, information, and faster-than-light interaction
- edguy99
- · Replies 97 ·
Graduate Hermitian Operators: Understanding How They Work
- amjad-sh
- · Replies 16 ·
Graduate Hamiltonian matrix for two electrons in a 1D infinite well
- nothingisreal
- · Replies 1 ·
Graduate Simulating long-distance correlations
- edguy99
- · Replies 4 ·
Graduate Penetrating the Rectangular Potential Barrier, E < V0
- Chip
- · Replies 1 ·
Graduate What Are the Key Questions Surrounding Quantum Decoherence?
- greypilgrim
- · Replies 37 ·
Graduate Why do the off-diagonal terms not matter in density matrices?
- cube137
- · Replies 7 ·
Graduate Difference between Bell and CHSH?
- jk22
- · Replies 4 ·
High School Can a Quantum Observer Perceive Superpositions Inaccessible to Humans?
- cube137
- · Replies 35 ·
Undergrad Photon question (collision or no collision)
- Psinter
- · Replies 10 ·
Graduate Quantum tunneling instantaneous
- God Plays Dice
- · Replies 4 ·
Graduate How does the classical world emerge from the quantum world?
- bremsstrahlung
- · Replies 3 ·
Graduate Perturbation theory, Intermediate states, Virtual particles
- spaghetti3451
- · Replies 1 ·
Graduate Understanding Pure and Mixed Quantum States in Entanglement
- daniellao
- · Replies 4 ·
Undergrad Why does a black body radiate in all the frequency spectrum?
- Joker93
- · Replies 7 ·
Graduate High-Fidelity Qubit Readouts: Definition & Overview
- Raptor112
- · Replies 4 ·
Graduate Understanding Quantum Purification
- aaaa202
- · Replies 1 ·
High School What Happens to a Cat in a Box Without Factorization?
- cube137
- · Replies 42 ·
Graduate Peskin and Schroeder - page 4 - choice of notation
- spaghetti3451
- · Replies 2 ·
Graduate Ground state energies and potential
- tyogav
- · Replies 2 ·
Graduate Non-locality: (FTL) 'influence' at all?
- entropy1
- · Replies 15 ·
Graduate Quantum fluctuations within an electromagnetic field
- J-eastwood
- · Replies 2 ·
Graduate Wigner function as average value of parity
- naima
- · Replies 2 ·
Graduate About the expectation value of position of a particle
- betelgeuse91
- · Replies 6 ·
Undergrad What do they mean that energy is quantized?
- DGonzo2015
- · Replies 20 ·
Undergrad Black Body radiation and thermal equilibrium
- Joker93
- · Replies 2 ·
High School Is it there or not (when we are not looking at it)?
- Une Personne
- · Replies 14 ·
Undergrad Do Photons Have Mass and Why Does it Matter?
- Evenus1
- · Replies 34 ·
Graduate Quantum Field Theory intro with flying field disturbances
- edguy99
- · Replies 2 ·
Graduate Integrate Laplacian operator by parts
- Eric_J
- · Replies 2 ·
Graduate Are probability coefficients source for semitransparence
- sciencejournalist00
- · Replies 5 ·
Graduate Confused about EPR Thought Experiment
- Thecla
- · Replies 12 ·
Graduate Electron-positron annihilation
- sandy stone
- · Replies 5 ·
Graduate Quantum mechanics is not weird (locality and non-locality weirdness)
- zonde
- · Replies 162 ·
High School How do scientists work with nonlinear crystals
- sciencejournalist00
- · Replies 23 ·
Graduate Quantum entanglement by the means of beam splitters
- sciencejournalist00
- · Replies 34 ·
Graduate Delta Function Identity in Modern Electrodynamics, Zangwill
- chi_rho
- · Replies 7 ·
Graduate Average momentum of energy eigenstates is always zero?
- taishizhiqiu
- · Replies 10 ·
Graduate Mathematical and actual measurements?
- Zafa Pi
- · Replies 7 ·
Graduate Density Matrix and State Alpha
- jlcd
- · Replies 24 ·
Graduate Can virtual particles exist without their counterparts?
- J-eastwood
- · Replies 7 ·
Graduate From Classical to Quantum Mechanics
- Joker93
- · Replies 12 ·
Graduate Radio Transmissions: Is It Possible in a 1x1x1m Cube?
- SlowThinker
- · Replies 1 ·
Graduate Understanding superposition of states
- misko
- · Replies 1 ·
Graduate Understanding proof for Heisenberg uncertainty
- TheCanadian
- · Replies 6 ·
Graduate Time independent perturbation theory
- Plaetean
- · Replies 7 ·
Graduate Decoherence in measurement apparatus
- entropy1
- · Replies 2 ·
Graduate Momentum-free spinors and the Dirac equation
- DiracPool
- · Replies 2 ·
High School Bell's Theorem basic question on contextuality & locality
- jlcd
- · Replies 6 ·
Graduate Revisiting Neumaier's Newtonian Quantum: A Critical Perspective
- jlcd
- · Replies 2 ·
Graduate Delta function and dirac notation
- KostasV
- · Replies 4 ·
Graduate Derivation of number of quantum states
- TheCanadian
- · Replies 1 ·
Graduate Bose-Einstein Stats and Planck Formula
- modulus
- · Replies 6 ·
Graduate Is Complete Disentanglement Possible in Finite Time?
- T S Bailey
- · Replies 5 ·
Graduate EPR paradox and time of collapse
- thephystudent
- · Replies 12 ·
Graduate Parity and integration in spherical coordinates
- KostasV
- · Replies 4 ·
Graduate S-matrix element for forward scattering and amputed green fu
- FrancescoS
- · Replies 1 ·
Graduate Mirror plane and spin direction
- Newstein
- · Replies 1 ·
Graduate Understanding the Propagation of Spherical Waves in Complex Quantities
- TheArun
- · Replies 5 ·
Graduate Matrix elements of non-normalizable states
- taishizhiqiu
- · Replies 2 ·
Graduate Does quantum entanglement in fact equal a wormhole?
- Guthrie Prentice
- · Replies 4 ·
Graduate Measurement-Free Interactions (MFI)
- PhysicsKid0123
- · Replies 1 ·
Undergrad What kind of differential equations one must know for QM?
- Joker93
- · Replies 2 ·
Graduate Verify the Rodrigues formula of the Legendre polynomials
- Happiness
- · Replies 3 ·
Graduate The Two-State Vector Formalism
- Hybrid
- · Replies 5 ·
Graduate Quantum fluctuation and quantum mysticism
- David Maroto
- · Replies 42 ·
Graduate What if there are no Schrödinger's cats?
- Petr Matas
- · Replies 24 ·
High School Is Decoherence Possible Without Collapse?
- jlcd
- · Replies 5 ·
Graduate Are infinitesimal field variations in QFT similar to coordinate components?
- Mishra
- · Replies 5 ·
Graduate How does QFT handle non-locality?
- PFfan01
- · Replies 103 ·
High School Quantization Explained: Understanding Photon Energy Packages
- I'mnotarobot
- · Replies 6 ·
Graduate Quantum mechanics for big things?
- AdrianHudson
- · Replies 67 ·
Graduate QFT: Understanding Counter-Terms for Renormalization
- anthony2005
- · Replies 6 ·
Graduate If im not measuring its not there?
- nnope
- · Replies 29 ·
Graduate Confusion about selection rules
- AlonsoMcLaren
- · Replies 4 ·
Graduate Generator of Boosts: Classical Quantity?
- pellman
- · Replies 21 ·
Graduate What applications does quantum physics have, specifically?
- mustang19
- · Replies 7 ·
Graduate What is the Linear Variation Method in Molecular Quantum Mechanics?
- Morten
- · Replies 1 ·
Graduate Can a cross product be defined between two Hilbert space vectors?
- DuckAmuck
- · Replies 1 ·
Undergrad Single electron ....two slits?
- tom.mulloy
- · Replies 5 ·
Graduate Criticize diagram of delayed choice quantum eraser
- Strilanc
- · Replies 4 ·
Graduate Oppenheimer's QM lecture notes
- mach4
- · Replies 8 ·
Graduate Slater determinants in Configuration Interaction
- saleheen
- · Replies 1 ·
Graduate Wave-function solution under Galilean transformations
- Happiness
- · Replies 3 ·
Graduate Entanglement and Some Unanswered Questions
- Neandethal00
- · Replies 8 ·
Undergrad Whats so amazing about the wave equation?
- toesockshoe
- · Replies 1 ·
Graduate Why Does ½ Factor in HF Expectation Value?
- Morten
- · Replies 6 ·
Graduate Electron ejected in Photoelectric effect
- Neutroniclad
- · Replies 27 ·
Undergrad Projective measurement and correlations: examples
- kaje
- · Replies 3 ·
Graduate Non-technical description of "superposition"
- Negatratoron
- · Replies 10 ·
Graduate Question about the wave function of a travelling wave
- Jeremy1986
- · Replies 3 ·