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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Undergrad Pseudorandom Entanglement and Special Relativity
- greswd
- · Replies 61 ·
Graduate Seven mathematical paradoxes in quantum mechanics
- micromass
- · Replies 19 ·
Undergrad What was Niels Bohr's rebuke to Schrödinger's Cat?
- tade
- · Replies 17 ·
Undergrad Understanding Bloch's Theorem: Does 'n' Label Energy Bands?
- aaaa202
- · Replies 3 ·
Graduate Time-ordering fermion operators
- Coriolis1
- · Replies 1 ·
High School Is classical mechanics philosophically sound?
- A. Neumaier
- · Replies 3 ·
High School Superposition of measurement apparatus
- entropy1
- · Replies 11 ·
Graduate Treatment of singlets in the Hubbard model
- supernano
- · Replies 1 ·
Undergrad Down convertor 2 photon entanglement - explanation?
- marcophys
- · Replies 3 ·
Undergrad What is the physical significance of <x'|x> in quantum mechanics?
- friend
- · Replies 124 ·
Undergrad Temperature in quantum systems
- lfqm
- · Replies 8 ·
Undergrad The postulate of Quantum Mechanics and Eigenvalue equation
- betelgeuse91
- · Replies 5 ·
High School Multi or single quantum state?
- fxdung
- · Replies 7 ·
Undergrad Momentum operator on positon/momentum representation
- dyn
- · Replies 9 ·
Undergrad Quantum number and energy levels
- Amy B
- · Replies 2 ·
High School Measuring one particle in a three-particle entangled system
- Fiziqs
- · Replies 8 ·
High School Why the "rush" to quantum spookiness
- Micheth
- · Replies 25 ·
Undergrad What does "completeness" mean in completeness relations
- Frank Castle
- · Replies 13 ·
Graduate One-Way Quantum Steering Evidence: Quantumness Experiments
- DrClaude
- · Replies 2 ·
Undergrad The Higgs and virtual particles
- andrew s 1905
- · Replies 2 ·
Undergrad Eigenfunctions and eigenvalues
- Amy B
- · Replies 7 ·
Undergrad Exact meaning of the Uncertainty Relations
- andrew s 1905
- · Replies 2 ·
Undergrad When should one eigenvector be split into two (same span)?
- PerilousGourd
- · Replies 5 ·
Undergrad Entaglement, locality, and information
- hideelo
- · Replies 5 ·
Undergrad Does photoelectric effect include light with threshold freq?
- Polly812
- · Replies 2 ·
Undergrad Quantizing the electrostatic field operator
- Konte
- · Replies 3 ·
Undergrad Inner products and adjoint operators
- Frank Castle
- · Replies 8 ·
Graduate Is the vacuum a thermal state?
- naima
- · Replies 1 ·
High School 2 events in a planck time not violate conservation of energy
- bluemoonKY
- · Replies 15 ·
High School Can an electron and a photon become entangled?
- KarminValso1724
- · Replies 2 ·
Undergrad Identical particles distinguished by their trajectory?
- Bootleg
- · Replies 5 ·
Undergrad Why can't someone be both a mathematician and a physicist?
- RafiG709
- · Replies 15 ·
High School Measurement and the creation/loss of information
- entropy1
- · Replies 2 ·
Undergrad Angular Momentum, classical vector analogy?
- Erebus_Oneiros
- · Replies 1 ·
Canadian PM 'Explain's' Quantum Computing
- StevieTNZ
- · Replies 3 ·
High School What constitutes a measurement of which slit - double slit
- Negatratoron
- · Replies 14 ·
Undergrad Where exactly does QFT differ from QM? (in their formalisms)
- carllacan
- · Replies 35 ·
High School Quantum definition of information
- lostinspace1999
- · Replies 3 ·
Undergrad Quantum numbers - Total Energy and Orbital Momentum
- klw289
- · Replies 5 ·
High School Disentanglemt of a system of particles
- befj0001
- · Replies 3 ·
Undergrad Can Decoherence Create a Superposition of Life and Death?
- durant35
- · Replies 15 ·
High School What is ¨unpolarized¨ light exactly?
- entropy1
- · Replies 59 ·
Undergrad Spin 1/2 particle confined to an infinite annular region.
- Spinnor
- · Replies 1 ·
High School Has the Casimir effect been directly observed?
- KarminValso1724
- · Replies 2 ·
Graduate Potential Energy Curve for Ammonia Inversion?
- kq6up
- · Replies 4 ·
High School About the Lorentz invariance of Planck constant
- Younghun park
- · Replies 2 ·
Graduate Is a Hadron a Quasiparticle in Condensed Matter Physics?
- Demystifier
- · Replies 33 ·
Undergrad Why is the spin of this state equal to one?
- shedrick94
- · Replies 6 ·
Graduate Symmetry considerations between observer and observed in QM
- spaghetti3451
- · Replies 14 ·
Undergrad Determination of electron energy in the 2 slit experiment
- drl
- · Replies 8 ·
High School Alpha is 1/137th of what? (Fine Structure Constant)
- juniorcarty
- · Replies 8 ·
Undergrad Why does the energy gap close and reopen during topological phase transitions?
- aaaa202
- · Replies 2 ·
Undergrad What is meant by the terminology "single particle state"?
- Frank Castle
- · Replies 20 ·
Undergrad Difference between superposition and mixed state
- Frank Castle
- · Replies 15 ·
Undergrad Where Does Light Come From and How Is It Produced?
- VaccumEnergy
- · Replies 3 ·
High School What causes recombination of virtual particles?
- newjerseyrunner
- · Replies 6 ·
High School Is it possible that god does not play dice with the universe, as Einstein said?
- KarminValso1724
- · Replies 2 ·
Undergrad Eigenvalue degeneracy in real physical systems
- ErikZorkin
- · Replies 176 ·
High School Silly questions about the behaviour of photons
- victorhugo
- · Replies 3 ·
Graduate What kind of coherence do we have in the ground state of a harmonic oscillator?
- LagrangeEuler
- · Replies 15 ·
High School FTL communication by Quantum Entanglement
- dawningparadox
- · Replies 1 ·
Undergrad Quantum jitter vs thermal jitter
- naima
- · Replies 8 ·
Undergrad Hydrogen Atom Photon Emission Wavelength Formula
- math_major_111
- · Replies 11 ·
Graduate Degenerate perturbation theory -- Sakurai
- ShayanJ
- · Replies 3 ·
Undergrad Polarization entanglement - multiple tests
- Erik Ayer
- · Replies 8 ·
High School How Does Environmentally Induced Decoherence Affect Quantum State Reduction?
- Feeble Wonk
- · Replies 280 ·
High School Is this QM learning pathway sound?
- houlahound
- · Replies 15 ·
Undergrad Unit and dimension about De broglie wave
- KT KIM
- · Replies 3 ·
High School Flashing In And Out of Existence?
- dstarwynn
- · Replies 8 ·
High School What's the confidence level of quantum to macro behavior?
- newjerseyrunner
- · Replies 8 ·
Undergrad The Debroglie Relation and SR?
- LarryS
- · Replies 35 ·
Undergrad Does the observer choose which state in Schrödinger's cat?
- dbcoopersurviv
- · Replies 97 ·
Graduate How to derive general solution to the Klein-Gordon equation
- "Don't panic!"
- · Replies 27 ·
Undergrad The Heisenberg cut demystified
- A. Neumaier
- · Replies 9 ·
High School Is the existence of Hilbert space proven or purely theoretical?
- KarminValso1724
- · Replies 8 ·
Undergrad Understanding Spinor Rotations
- gentsagree
- · Replies 2 ·
Undergrad Tensor Product in QM: 1D vs 3D Hilbert Spaces
- pellman
- · Replies 3 ·
High School Can Bell's inequality tests rule out hidden variables in entanglement?
- adfreeman
- · Replies 82 ·
Undergrad Deriving momentum operator from commutator in Weinberg QM section 3.5
- jouvelot
- · Replies 11 ·
High School Photon and half-silvered mirror
- entropy1
- · Replies 17 ·
High School If all particles were different sizes, would the speed of light stay the same
- KarminValso1724
- · Replies 2 ·
Undergrad Why do we require locality in quantum field theory?
- Frank Castle
- · Replies 31 ·
High School Looking for Wilhelm Wien's original paper
- tade
- · Replies 3 ·
Graduate Single qubit coherence time record
- Dragonfall
- · Replies 1 ·
High School Photoelectric Effect under cutoff frequency
- Djinn Ming
- · Replies 2 ·
Undergrad Question regarding the Dirac delta function
- Kevin McHugh
- · Replies 7 ·
Graduate Dirac delta function as a distribution on L² spaces
- stevendaryl
- · Replies 58 ·
Graduate Why are low pressure gas discharge lamps thermal sources?
- Paul Colby
- · Replies 1 ·
Graduate Is Rest Mass a subjective quantity?
- thephystudent
- · Replies 3 ·
High School What's an electron doing between interactions?
- newjerseyrunner
- · Replies 8 ·
High School Thought experiment violates Heisenberg? (of course not)
- entropy1
- · Replies 6 ·
High School Which particles do not have dualistic character?
- Liana008
- · Replies 11 ·
Undergrad What specific momentum should be used in the matter wave?
- LarryC
- · Replies 5 ·
Undergrad Are Planck-Einstein photon energies confirmed experimentally?
- DavidReishi
- · Replies 5 ·
Undergrad Understanding Bra-Ket Notation in Quantum Mechanics
- Kara386
- · Replies 12 ·
Undergrad Direction of magnetic field measured by 2 coherent electrons
- exponent137
- · Replies 1 ·
Undergrad Feynman Lecture Vol III Ch. 8 Question -- Heisenberg matrix picture
- kq6up
- · Replies 2 ·
Undergrad Why does an up quark change to a down quark in beta decay?
- StanEvans
- · Replies 7 ·
Undergrad Is Ψ2Px an Eigenfunction of L2 or Lz in Quantum Mechanics?
- kenyanchemist
- · Replies 6 ·
Undergrad What Is the Tunnel Effect in Time-Independent Quantum Mechanics?
- LagrangeEuler
- · Replies 3 ·