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 Is renormalization the ideal solution?
- Geonaut
- · Replies 57 ·
Graduate Hamiltonian background magnetic field, perturbed by electric field
- binbagsss
- · Replies 2 ·
Undergrad Stern-Gerlach "interferometry"
- WWCY
- · Replies 10 ·
High School Quantum computer vs supercomputer performance
- Bob Walance
- · Replies 8 ·
Undergrad What determines photon frequency when absorbed and emitted by electrons?
- dsaun777
- · Replies 19 ·
Undergrad The expected value (or mean) of X
- peace
- · Replies 6 ·
Graduate Time Dependent Perturbation of Harmonic Oscillator
- Diracobama2181
- · Replies 1 ·
Graduate What is the definition of 'ground state',considering H- ion = -14.35eV
- cmb
- · Replies 2 ·
Undergrad Griffiths notation for spin expectation values with Re and Im
- kmm
- · Replies 9 ·
Undergrad Dirac notation and calculations
- electrogeek
- · Replies 9 ·
Undergrad What do the commutation/anti-commutation relations mean in QFT?
- moss
- · Replies 18 ·
High School Roger Penrose's need for a physics Grey area
- edmund cavendish
- · Replies 2 ·
Undergrad Quantum number and group theory
- Dalor
- · Replies 10 ·
Undergrad Relationship between EM and matter fields in QED
- CSnowden
- · Replies 19 ·
Undergrad Probability flux inside the finite potential barrier
- Haynes Kwon
- · Replies 1 ·
Undergrad Fourier Transform of the Wave function
- Haynes Kwon
- · Replies 1 ·
High School Normalizability of continuous and discrete spectrum
- Sunny Singh
- · Replies 3 ·
Undergrad Proving the anticommutator of canonical momentum vanishes in the Pauli equation
- Airton Rampim
- · Replies 4 ·
High School Can a quantum particle be simulated on a classical computer?
- TheQuestionGuy14
- · Replies 1 ·
High School What is the largest object that exhibits Quantum properties
- Suppaman
- · Replies 18 ·
Undergrad Wave function for a helium atom
- olgerm
- · Replies 19 ·
Undergrad Parity and Interactions: Misreading or Misunderstanding?
- KevinMcHugh
- · Replies 2 ·
Graduate Fock spaces and inequivalent ccr representations
- Heidi
- · Replies 5 ·
Graduate Overlap of nth QHO excited state and momentum-shifted QHO ground state
- HBHSU
- · Replies 1 ·
Undergrad Giving mass to other particles?
- Xforce
- · Replies 4 ·
Undergrad Calculating a particular amplitude with Feynman diagrams
- Ringo Hendrix
- · Replies 2 ·
Graduate Difference between russel-saunders-coupling and spin-orbit-coupling
- JanSpintronics
- · Replies 3 ·
Undergrad Time Delay Information Transfer with Entangled Particles
- jackmiller2003
- · Replies 10 ·
Undergrad Energy at classically forbiden positions
- DaTario
- · Replies 26 ·
Undergrad Observation = interaction, question from a dummy
- CuriousCop
- · Replies 10 ·
Undergrad Why do raising operators for spin 1/2 have a factor of ℏ?
- aliens123
- · Replies 2 ·
High School Does QED explain light reflection through photon absorption and re-emission?
- fbs7
- · Replies 14 ·
Undergrad Can gravitons help unify quantum mechanics and general relativity?
- Physics4Eva
- · Replies 2 ·
Undergrad When can the Klein-Gordon Equation be used for a photon?
- LarryS
- · Replies 11 ·
Undergrad Entanglement/correlations in time
- WWCY
- · Replies 1 ·
Graduate Measurements and electroweak gauge invariance/transformations
- Michael Price
- · Replies 2 ·
Graduate What is the solution for two electrons on a sphere?
- bob012345
- · Replies 50 ·
High School Photons as bullets at 10 trillion FPS (frames per second)
- EPR
- · Replies 14 ·
Graduate Canonical quantization of Electrodynamics: physical intuition ?
- maajdl
- · Replies 3 ·
High School Can a wavelength be smaller than a Planck length?
- sqljunkey
- · Replies 7 ·
High School Photon Continuity in Double-Slit Experiment
- jeremyfiennes
- · Replies 80 ·
High School Is the Velocity of Electron Spin Calculable Using Classical Models?
- Dilema
- · Replies 14 ·
Undergrad It seems QFT and QM contradict with each other?
- fxdung
- · Replies 15 ·
Graduate Increase of coherent length in stimulated emission
- DaTario
- · Replies 19 ·
Undergrad Simplifying bilinear product with sigma matrices and epsilon tensors
- hamad12a
- · Replies 5 ·
High School Can entangled particle pairs be measured at the same time?
- Quantum Alchemy
- · Replies 15 ·
Undergrad Why is the position of a massive particle not blurred?
- fxdung
- · Replies 9 ·
Undergrad Why is position just a label in QFT?
- LarryS
- · Replies 6 ·
Undergrad Bracket VS wavefunction notation in QM
- olgerm
- · Replies 82 ·
Graduate Conservation of Quantum Information
- nateHI
- · Replies 26 ·
Undergrad How to calculate the Lamb Shift in Hydrogen?
- zincshow
- · Replies 1 ·
High School Is Human Height Ever Exactly Pi Feet?
- batmelon
- · Replies 5 ·
Undergrad Spatial derivative of a two-particle Hamiltonian with density matrix dependence
- LeeT
- · Replies 1 ·
Undergrad Two Photon Sagnac Source
- Erik Ayer
- · Replies 5 ·
Undergrad Mach-Zender-Interferometer with polarizers
- Sonderval
- · Replies 8 ·
Undergrad Notion of a "clock" in Quantum Mechanics
- WWCY
- · Replies 4 ·
Graduate How do entanglement experiments benefit from QFT (over QM)?
- DrChinese
- · Replies 473 ·
Undergrad Why is a resonant frequency assumed in blackbody radiation?
- kelly0303
- · Replies 8 ·
Graduate Extra terms in the Action in Zee chapter 1.3?
- looseleaf
- · Replies 2 ·
Undergrad Why simultaneous detection of wave and particle nature is not possible
- Ablaze_
- · Replies 8 ·
Undergrad Why does the square of the amplitude of a wave function represent P?
- Haynes Kwon
- · Replies 3 ·
High School Does a field's vacuum density violate conservation of energy?
- TheQuestionGuy14
- · Replies 29 ·
Undergrad Conservation of energy and measurement problem
- entropy1
- · Replies 3 ·
High School How to obtain state vector for polarised light
- etotheipi
- · Replies 6 ·
Undergrad Complementarity Of One- And Two-Particle Interference
- Erik Ayer
- · Replies 2 ·
Undergrad How to get the wavefunction of a single particle in QFT?
- DoobleD
- · Replies 2 ·
Undergrad Dark Matter and quantum observable
- new6ton
- · Replies 1 ·
High School Is classical physics an approximation of quantum physics?
- new6ton
- · Replies 21 ·
Undergrad Wave function of a scattered particle and cross section
- dRic2
- · Replies 8 ·
Graduate Do the time and normal ordering operators commute?
- QFT1995
- · Replies 11 ·
Graduate Gauge breaking and Faddeev-Popov ghost particles
- Michael Price
- · Replies 46 ·
Undergrad Does downconversion cause pump photon wavefunction collapse?
- Erik Ayer
- · Replies 8 ·
Graduate Why are loop diagrams O(h) corrections to tree level amplitudes?
- PGaccount
- · Replies 2 ·
Undergrad Physical Meaning of a Quantum Field
- Bobjoesmith
- · Replies 5 ·
Undergrad Can a 4x4 matrix act on a 2x2 matrix in a specific way?
- Replusz
- · Replies 4 ·
Graduate Bosonic Field operator in this exponential
- QFT1995
- · Replies 2 ·
Undergrad Bohr model for electron energy states
- Iceking20
- · Replies 4 ·
High School Quantum Gravity and Special Relativity
- Meruem
- · Replies 2 ·
High School Interaction of light with atoms
- jeremyfiennes
- · Replies 9 ·
Undergrad How does the expectation value of the spin operator evolve over time?
- Garlic
- · Replies 3 ·
Undergrad Are quantum states always vectors in Hilbert space?
- nomadreid
- · Replies 6 ·
Graduate Theoretical status of the Landauer Principle
- Prathyush
- · Replies 12 ·
Graduate Why are most molecules in the singlet state instead of the triplet state?
- hariharan venkatasu
- · Replies 4 ·
Undergrad Can two particles be in the same place at the same time?
- JamesN
- · Replies 2 ·
Undergrad "Dumb" question : is there an upper bound on the energy of a photon?
- s00mb
- · Replies 3 ·
High School Is quantum entanglement a four dimensional force?
- Meruem
- · Replies 5 ·
Undergrad What happens to an electron's frequency during absorption of a photon?
- Iceking20
- · Replies 4 ·
Graduate Derivative of a Lorentz-Transformed Field
- looseleaf
- · Replies 2 ·
Undergrad Rydberg Equation: Physics and Beyond
- Iceking20
- · Replies 5 ·
High School Do electrons accelerate during energy state transitions?
- Iceking20
- · Replies 34 ·
Graduate Can Work Be Defined for a Quantum System with a Time-Dependent Hamiltonian?
- Prathyush
- · Replies 11 ·
Undergrad Solving a quantum harmonic oscillator using quasi momentum
- Prathyush
- · Replies 1 ·
Graduate Correlation functions of quantum Ising model
- Danny Boy
- · Replies 1 ·
High School Quantum radar and its implications
- GTOM
- · Replies 3 ·
Undergrad Schrodinger equation for a free particle in 3d space
- GeolPhysics
- · Replies 6 ·
Undergrad Does this system have runaway solutions?
- srallaba
- · Replies 10 ·
Graduate Delta function with negative subscripts in P&S
- looseleaf
- · Replies 16 ·
Undergrad Am I crazy or is my book wrong?
- yjl
- · Replies 5 ·
Undergrad What would happen if wavelength could go higher than gamma rays
- Iceking20
- · Replies 8 ·
Undergrad Attractive van der Waals force between similar atoms/molecules
- Swamp Thing
- · Replies 10 ·