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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High School Is angular momentum of a quantum object, metaphorical?
- bland
- · Replies 28 ·
Undergrad Relationship Between Hermitian and Symmetric Matrices
- math_major_111
- · Replies 3 ·
Undergrad Why do the alternatives separate from each other?
- Erland
- · Replies 7 ·
Undergrad QFT for the Gifted Amateur Question (3)
- 43arcsec
- · Replies 1 ·
High School What theorem forbids communication between branches in quantum mechanics?
- fanieh
- · Replies 9 ·
Graduate Quantized E field, Coulomb Gauge with Interactions
- MisterX
- · Replies 8 ·
High School What is information?
- Einstein's Cat
- · Replies 5 ·
Undergrad Ensembles and density matrices - I don't get it
- Erland
- · Replies 10 ·
Undergrad The wave function is an exponential function, if I plot the
- LSMOG
- · Replies 3 ·
Undergrad Test of Bell's Theorem: Experiments Beyond Polarization
- Dadface
- · Replies 6 ·
High School Can a hydrogen atom be in a superposition before photon emission?
- Shing Ernst
- · Replies 10 ·
High School Quantum Physics -Double Slit Delayed Observation
- Bill_W
- · Replies 13 ·
High School Can Measuring Momentum Make a Marble's Position Vanish?
- fanieh
- · Replies 6 ·
High School Does tunneling affect the energy of a particle in a finite box?
- houlahound
- · Replies 3 ·
Graduate I've tried to read the reason for using Fourier transform
- LSMOG
- · Replies 5 ·
High School Electron Diffraction and the DeBroglie Wavelength
- Guest432
- · Replies 1 ·
Graduate Does Quantum Foam Influence the Gravity of the Universe?
- Ginosko
- · Replies 1 ·
High School The moment we observe superposition
- Taskle
- · Replies 14 ·
Graduate Mandelstam Variables for 2->2 Scattering with Equal Masses in CoM Frame
- spaghetti3451
- · Replies 32 ·
High School How does electron microscopy exploit wave/particle duality?
- Guest432
- · Replies 2 ·
Undergrad Can someone explain this picture to me?
- Armando Valle
- · Replies 3 ·
Undergrad Finite difference method for Schrödinger equation
- aaaa202
- · Replies 3 ·
Undergrad Quantum thermodynamics of single particle
- Konte
- · Replies 13 ·
Undergrad Is vacuum energy infinite? If it is, how and why?
- Noduagga
- · Replies 5 ·
High School Can quantum mechanics be derived from deeper principles?
- kochanskij
- · Replies 2 ·
High School Could spin be a combination of magnetic monopoles?
- Wminus
- · Replies 11 ·
High School Can quantum teleportation transmit information?
- TJung
- · Replies 10 ·
High School How Does Quantum Darwinism Relate to the Born Rule and Observer Agreement?
- cube137
- · Replies 43 ·
Undergrad Bell's Theorem: Understanding Bell's Nonlocality and How it Applies to Photons
- jk22
- · Replies 6 ·
Undergrad Role of entanglement in general purpose quantum computing
- raphampm
- · Replies 2 ·
High School Is there a minimum wavelength for electromagnetic radiation?
- afcsimoes
- · Replies 11 ·
Graduate Is Brute Force the Best Approach to Proving Feynman's Denominator Formula?
- spaghetti3451
- · Replies 3 ·
Undergrad Does the electron really spin 720 degrees?
- Chris Frisella
- · Replies 71 ·
Graduate Spinors in dimensions other than 4
- spaghetti3451
- · Replies 3 ·
Undergrad Unified gravity with electroweak through SU(2)xSU(2)xU(1)
- fxdung
- · Replies 3 ·
High School What is the Light Constant and Its Relationship to Maxwell's Equations?
- Ali Abbas
- · Replies 2 ·
High School Decoherence thought experiment
- jartsa
- · Replies 4 ·
High School Is it a myth that serves as motivation for decoherence?
- zonde
- · Replies 11 ·
Graduate Particles in quantum field theory
- A. Neumaier
- · Replies 16 ·
High School Photoelectric effect and atomic excitation
- Metals
- · Replies 3 ·
High School Compton’s experiment vs ordinary mirror
- exmarine
- · Replies 8 ·
Undergrad Uncertainty of electron energy based on confinement radius?
- excalibur313
- · Replies 2 ·
Undergrad Decoherence and time reversal asymmetry
- Charlie313
- · Replies 4 ·
Undergrad Does wavefunction change from photon absorption propagate faster than light?
- asimov42
- · Replies 5 ·
High School Does an electron oscillate as it moves through space?
- LSMOG
- · Replies 17 ·
Undergrad Problem during finding <x> in p space
- Shell_E
- · Replies 4 ·
Undergrad What is the width of a wave packet?
- RicardoMP
- · Replies 3 ·
High School Can Particles Really Pop Into Existence from a Vacuum?
- NewToThis
- · Replies 26 ·
Undergrad What are spinors and how are they used in physics?
- Aakash Lakshmanan
- · Replies 16 ·
Graduate Is Gravity Directly Related to Groupings of Atoms?
- EsquireWilliam
- · Replies 9 ·
Undergrad Stationary states -- Boltzmann distribution
- Konte
- · Replies 22 ·
High School What Causes Decoherence in Quantum Systems?
- bluecap
- · Replies 31 ·
Graduate Issue in the electron’s infinite self-energy
- USeptim
- · Replies 3 ·
High School States as positive operators of unit trace
- cube137
- · Replies 8 ·
Undergrad Square integrable wave functions vanishing at infinity
- RicardoMP
- · Replies 4 ·
Undergrad Wavefunction spreading speed in material mediums
- Gerinski
- · Replies 1 ·
Undergrad What is the wavelike behavior of an electron in superposition?
- Kiki
- · Replies 16 ·
Undergrad Everett on measurements: what does he mean?
- Erland
- · Replies 8 ·
Undergrad Two single-photon Fock states vs one two-photon Fock state
- maxverywell
- · Replies 25 ·
High School What is the relationship between spin and angular momentum in quantum mechanics?
- Ontophobe
- · Replies 5 ·
Undergrad Entangled system pure state or not?
- bluecap
- · Replies 80 ·
High School Is wave a physical object or its just a model?
- LSMOG
- · Replies 12 ·
Undergrad Are renormalizable QFT the ''really renormalizable''?
- fxdung
- · Replies 16 ·
High School Why do we say that there is no polarization until it is measured
- Robin
- · Replies 7 ·
High School Is dark/vacuum potential energy infinite?
- Noduagga
- · Replies 13 ·
Undergrad Why does an electron undergo diffraction?
- LSMOG
- · Replies 6 ·
Undergrad Why do we use Complex Wave function?
- SiuKing666
- · Replies 3 ·
High School Penrose collapse and Superposition
- bluecap
- · Replies 8 ·
Undergrad Is there any operator for momentum in terms of t?
- Aswin Sasikumar 1729
- · Replies 3 ·
High School Why does CPT theorem apply to all Lorentz covariant Lagrangians?
- fxdung
- · Replies 1 ·
Undergrad Limit to the max size of a Nucleus
- daniel christ
- · Replies 7 ·
Undergrad Vanishing Hamiltonian for quantum path integral
- spaghetti3451
- · Replies 2 ·
Graduate Feynman rules for a 0-dimensional field theory
- spaghetti3451
- · Replies 15 ·
Undergrad Do path integral terms for causally disconnected particles cancel out?
- asimov42
- · Replies 6 ·
High School Why do ladder operators give all quantum oscillator states?
- Mayan Fung
- · Replies 14 ·
Graduate Function integration of a Gaussian integral
- spaghetti3451
- · Replies 1 ·
Graduate Why quantum mechanics looks so different from classical one?
- Nixom
- · Replies 27 ·
Graduate How to Calculate Probability using Density Operator?
- Guilherme Vieira
- · Replies 5 ·
Undergrad Anderson Localization and general disorder of matter?
- asimov42
- · Replies 9 ·
High School Can position eigenstates be considered qubits in quantum computing?
- bluecap
- · Replies 11 ·
Undergrad Why does Simon's algorithm need n-1 equations to find the secret string?
- Aakash Lakshmanan
- · Replies 1 ·
Undergrad How can you detect which path an electron will take in a double-slit experiment?
- maka89
- · Replies 7 ·
Graduate Utility of path integral formulation of quantum mechanics
- spaghetti3451
- · Replies 12 ·
Insights Why Is Quantum Mechanics So Difficult? - Comments
- Greg Bernhardt
- · Replies 251 ·
Undergrad Probability of one-photon loss from a cavity
- maxverywell
- · Replies 3 ·
Undergrad Why is the Kinetic Energy Operator Differentiated Twice Instead of Squared?
- Mayan Fung
- · Replies 3 ·
High School Question about photocell experiment
- Clara Chung
- · Replies 1 ·
High School Does QM allow for entropy decrease of a closed system?
- Grinkle
- · Replies 13 ·
Undergrad Why Is the Limit ##\hbar \rightarrow 0## Called the Semiclassical Limit?
- spaghetti3451
- · Replies 20 ·
Graduate Where does statistical physics/mechanics fit in with QFT,GR?
- Indiana
- · Replies 1 ·
Undergrad Beam in specific photon number state?
- maxverywell
- · Replies 7 ·
High School How do you prepare an electron in an atom in a pure state?
- bluecap
- · Replies 18 ·
Undergrad Localization of particles and disorder at the quantum level?
- asimov42
- · Replies 5 ·
Undergrad Wave particle duality and phonons
- Collin237
- · Replies 10 ·
Graduate Projection trick to obtain time-ordered correlator
- spaghetti3451
- · Replies 1 ·
Graduate Partition function in quantum field theory
- spaghetti3451
- · Replies 6 ·
Graduate Path integral computes time-ordered products
- spaghetti3451
- · Replies 1 ·
Undergrad Why can't we use negative values of n in the 1D particle in a box system?
- Thejas15101998
- · Replies 5 ·
Graduate 3D oscillator trapped away from centre
- ftft
- · Replies 3 ·
Undergrad Why does the Green's function relate to density of states?
- Nusc
- · Replies 1 ·