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 The Spectral Gap and Quantum Vacuum Fluctuations
- Cerenkov
- · Replies 2 ·
Undergrad Why does computing momentum for a superposed wave give imaginary result?
- learn.steadfast
- · Replies 20 ·
Graduate Entangled wave function solved perturbatively
- friend
- · Replies 1 ·
Graduate Finding expectation values of position and momentum for a Gaussian wave packet
- bkmtkm
- · Replies 2 ·
Undergrad Period and probability density for a harmonic oscillator
- Another
- · Replies 2 ·
Undergrad Space and time dependence of entangled particles
- friend
- · Replies 2 ·
Undergrad Why does adding a detector eliminate interference in the double-slit experiment?
- mk9898
- · Replies 11 ·
Graduate Why do particles have spin and what happens if they stop?
- Kanishka Toshniwal
- · Replies 31 ·
Undergrad Wave function collapse in a double slit experiment
- Sandeep T S
- · Replies 6 ·
Undergrad How close do electrons and positrons have to be to interact?
- Cato
- · Replies 4 ·
Undergrad Why we do not need the total Lagrangian?
- fxdung
- · Replies 10 ·
Graduate Quantum fields and the harmonic oscillator
- Higgsono
- · Replies 4 ·
High School Why Do We See Distinct Lines in Atomic Emission and Absorption Spectra?
- black hole 123
- · Replies 17 ·
Undergrad Hyperfine structure - Hamiltonian and bases
- Teri
- · Replies 1 ·
Undergrad Is the electromagnetic field of an electron in QFT a real physical field?
- Philipsmett
- · Replies 11 ·
Undergrad What is the significance of coupling in surface plasmons and plasmon polaritons?
- Avardia
- · Replies 1 ·
Undergrad Polarization of light and probability
- rasp
- · Replies 17 ·
Undergrad Understanding Redshift: The Role of Relative Motion between Emitter and Absorber
- Harry17
- · Replies 2 ·
Undergrad Difference between preparing and measuring
- rasp
- · Replies 15 ·
High School Can three-particle entanglement enable faster-than-light communication?
- mataku
- · Replies 56 ·
Undergrad Multiplication of ladder-operators
- Philip Land
- · Replies 1 ·
Undergrad Why can't two electrons occupy the same quantum state?
- Quantum9999
- · Replies 1 ·
High School Entropy -- What exactly is it?
- Levi Woods
- · Replies 6 ·
Graduate Green's function for the wave function
- Higgsono
- · Replies 1 ·
Graduate Is the Fenna-Matthews-Olson complex a quantum dot?
- Christopher Rourk
- · Replies 1 ·
Undergrad Does quantum entanglement depend on the chosen basis?
- microsansfil
- · Replies 37 ·
Graduate Fermi-Dirac statistics, finding all electron configurations
- sigint00
- · Replies 3 ·
Undergrad What is the common & connection of quantum entanglement and entropy?
- Dhammika
- · Replies 4 ·
Graduate How to measure the first qubit in two qubit system? QC
- Frank Schroer
- · Replies 4 ·
Graduate Fresnel Diffraction - Opaque Barrier Question
- frederico
- · Replies 6 ·
Undergrad Phase and group velocity for a free particle
- hokhani
- · Replies 9 ·
Undergrad Interference between an electron and a photon?
- Sandeep T S
- · Replies 11 ·
High School Can a neutral pion contain a strange quark and anti-strange quark pair?
- Quarkyguy
- · Replies 4 ·
Undergrad Does Multiplying Wavefunctions Affect Their Radius?
- Bob Dylan
- · Replies 5 ·
High School Is the classical EM wave a single photon?
- S Beck
- · Replies 12 ·
Undergrad Compound double slit with measurement on only one
- Sting33
- · Replies 20 ·
Undergrad Schmidt decomposition and entropy of the W state
- yamata1
- · Replies 1 ·
Undergrad Superposition of ortho and parahelium states
- Rafael
- · Replies 3 ·
Undergrad Send the measurement device through a double slit
- greypilgrim
- · Replies 5 ·
Graduate How can quarks exist if they are confined?
- DarMM
- · Replies 65 ·
Graduate What is the role of Eve in a Man in the Middle attack?
- Nur Ziadah
- · Replies 6 ·
Undergrad Why does classical wave energy theory fail to explain the photoelectric effect?
- Sandeep T S
- · Replies 6 ·
Undergrad Diffracted photon/partice momentum
- negative
- · Replies 11 ·
Graduate Seeking a derivation of Schrödinger's wave equation
- gnnmartin
- · Replies 12 ·
Undergrad Hertz Experiment: Original Paper on Photoelectric Effect
- Sandeep T S
- · Replies 8 ·
Undergrad The virtual photon can turn into a virtual electron positron?
- Philipsmett
- · Replies 6 ·
Graduate Conserved currents from Standard Model symmetries before and after SSB
- HomogenousCow
- · Replies 6 ·
Undergrad No interference if orthogonally polarized
- greypilgrim
- · Replies 2 ·
Undergrad Photon detector on a dual slit experiment
- rasp
- · Replies 3 ·
Undergrad The Uncertainty Principle - question within Griffiths' Text
- Sparky_
- · Replies 1 ·
Undergrad Griffiths' Intro to Quantum Mechanics - primed variables
- Sparky_
- · Replies 10 ·
High School Is radioactive decay truly random or just unpredictable?
- JesW87
- · Replies 5 ·
Undergrad How to interpret the diffraction envelope
- Bill Sellers
- · Replies 4 ·
Undergrad Are there proposed physical processes for superposition
- rasp
- · Replies 13 ·
Undergrad What makes a field theory relativistic?
- LarryS
- · Replies 2 ·
Undergrad Effect of Roughness on Cavity Resonator Spectrum
- Swamp Thing
- · Replies 2 ·
Graduate Dipole, harmonic oscillator, and the coherent state
- Karthiksrao
- · Replies 3 ·
Undergrad Light reflections between glass surfaces in Feynman's QED
- Srihari05
- · Replies 1 ·
Undergrad Mathematics of Normalization in Physics
- KurtLudwig
- · Replies 4 ·
Undergrad What happens to entanglement inside a polarizer?
- boxfullofvacuumtubes
- · Replies 4 ·
Undergrad Can spacetime perturbation reveal which slit a photon passes through?
- greypilgrim
- · Replies 7 ·
Undergrad Can a qubit have a finite number of ontic states in an epistemic model?
- msumm21
- · Replies 1 ·
Graduate Causality and probability in QFT with real scalar fields
- Aleolomorfo
- · Replies 1 ·
Undergrad Electron and virtual electron-positron pair
- Philipsmett
- · Replies 1 ·
Undergrad Compton scattering in a Feynman diagram
- nomadreid
- · Replies 8 ·
Graduate Heisenberg/Schrodinger pictures versus passive/active
- Geofleur
- · Replies 10 ·
High School Can you measure a particle without breaking superposition?
- TheQuestionGuy14
- · Replies 4 ·
Undergrad Can you measure a particle's speed over one Planck length?
- InfiniteEntity
- · Replies 5 ·
Undergrad The allowed energies of a 3D harmonic oscillator
- kkabi_seo
- · Replies 3 ·
High School UV catastrophe and photoelectric effect in gold leaf electroscope
- Jimmy87
- · Replies 1 ·
Undergrad Do all TISE solutions for a finite barrier have either a or b zero?
- Clara Chung
- · Replies 5 ·
Undergrad About spin precession in a magnetic field
- Francisco Dahab
- · Replies 4 ·
High School Allowed and forbidden transitions
- PainterGuy
- · Replies 18 ·
Undergrad Why are vector components conjugated in the inner product formula?
- SebastianRM
- · Replies 15 ·
Undergrad Why is Lz quantized but Lx and Ly are not in hydrogen?
- Rafael
- · Replies 3 ·
Graduate Representing harmonic oscillator potential operator in. Cartesian basis
- Apashanka
- · Replies 7 ·
Undergrad Raising the ladder operators to a power
- MooshiS
- · Replies 3 ·
Undergrad What is the difference between quantum field theory and quantum electrodynamics?
- Philipsmett
- · Replies 10 ·
High School Have interference on single particles been mapped
- Martyn Arthur
- · Replies 4 ·
Undergrad Transistors and Quantum Physics
- Zeynel
- · Replies 12 ·
Undergrad Why are <dx/dt> and <dp/dt> 0?
- EquationOfMotion
- · Replies 14 ·
Graduate Is there an additional assumption in the PBR theorem?
- PeterDonis
- · Replies 120 ·
Undergrad Polarization and the beam splitter
- Mentz114
- · Replies 7 ·
Undergrad Resolvent formalism in quantum mechanics
- Konte
- · Replies 7 ·
High School So what is the new definition of the kilogram?
- bbbl67
- · Replies 63 ·
Undergrad Why does the fermionic field have this time ordered contraction?
- Avogadro Number
- · Replies 3 ·
Undergrad If the wave function is complex and the measurement is real
- rasp
- · Replies 4 ·
Graduate Diagonalization of Hubbard Hamiltonian
- Guilherme
- · Replies 1 ·
Undergrad Poles in Casimir force as function of frequency & mode
- Swamp Thing
- · Replies 2 ·
Graduate Is there an uncertainty in energy measurement in quantum mechanics?
- CGandC
- · Replies 17 ·
High School Are bosons always their own antiparticle
- friend
- · Replies 11 ·
Undergrad How can laser photons have the same precise energy?
- LarryS
- · Replies 15 ·
Undergrad Writing perturbed wave function
- TheBlueDot
- · Replies 1 ·
Undergrad Accuracy of time dilation measurement *in principle*
- bland
- · Replies 9 ·
Undergrad Thought experiment about superposition.
- rasp
- · Replies 3 ·
High School How slow can Gedanken experiments be theoretically?
- NTHstars
- · Replies 9 ·
Graduate Operators used without being explained
- Technon
- · Replies 4 ·
Undergrad About the Schrödinger equation
- Konte
- · Replies 19 ·
High School What Makes Two Identical Hydrogen Atoms Different?
- Wondermine
- · Replies 25 ·
Undergrad Solution of Quantum differential equation
- Edge5
- · Replies 4 ·