Quantum Physics Forum

Post thread
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.

Quantum Interpretations and Foundations

Graduate Understanding Barandes' microscopic theory of causality
Graduate How to get the commutation relation of q and p
  • · Replies 5 ·
Replies
5
Views
3K
Graduate Positronium from vacuum fluctuations ?
  • · Replies 4 ·
Replies
4
Views
2K
Graduate The normalization constant in wave function and another questions
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Pointer Momentum of a Measuring Apparatus
  • · Replies 3 ·
Replies
3
Views
1K
Graduate Crude Probability calculation for tunneling
  • · Replies 2 ·
Replies
2
Views
1K
Graduate Conserved quantities as symmetry generators
  • · Replies 1 ·
Replies
1
Views
3K
Graduate Quantum Entanglement Basic Experiment Question
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Expectation value of an operator
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Translation operator on a sphere
  • · Replies 5 ·
Replies
5
Views
2K
Graduate The central mystery of quantum mechanics (according to Feynman)
  • · Replies 30 ·
2
Replies
30
Views
8K
Graduate Weak gravity at quantum level?
  • · Replies 4 ·
Replies
4
Views
2K
Graduate Orbitals while transitioning from free electron to ground state
  • · Replies 5 ·
Replies
5
Views
2K
Graduate What causes different energy levels in atoms with multiple electrons?
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Covariant vs Canonical Formalism
  • · Replies 4 ·
Replies
4
Views
2K
Graduate Non Polynomial Hamiltonian Constraint
  • · Replies 1 ·
Replies
1
Views
1K
Graduate Quantum Mechanics as Quantum Information
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Projective representations of the spin group
  • · Replies 4 ·
Replies
4
Views
2K
Graduate Isotropic absorption and emission
  • · Replies 1 ·
Replies
1
Views
3K
Undergrad Do you know any properties of photons?
  • · Replies 1 ·
Replies
1
Views
1K
Graduate Verifying Equality in Scarani's "Six Quantum Pieces
  • · Replies 25 ·
Replies
25
Views
4K
Graduate Complementarity with single slit diffraction
  • · Replies 5 ·
Replies
5
Views
2K
Graduate Does time reversal symmetry imply hermicity of s-matrix?
  • · Replies 5 ·
Replies
5
Views
3K
Graduate Is ρV a reliable measure of atom probability in small volumes?
  • · Replies 4 ·
Replies
4
Views
1K
Graduate Probability theory and quantum mechanics
  • · Replies 11 ·
Replies
11
Views
3K
Graduate Angular momentum Operators and Commutation
  • · Replies 29 ·
Replies
29
Views
5K
Graduate Physically realisable states and spectra
  • · Replies 6 ·
Replies
6
Views
2K
Graduate Does uncertainty of position of particles make substances continuous?
  • · Replies 11 ·
Replies
11
Views
2K
Graduate Remind me where to find a proof of a spectral theorem for RHS
  • · Replies 4 ·
Replies
4
Views
2K
Graduate If you measure the energy of a system how does wave function collapse
  • · Replies 12 ·
Replies
12
Views
4K
Graduate Is There Experimental Proof of Photon Existence Beyond Emission and Absorption?
  • · Replies 3 ·
Replies
3
Views
4K
Graduate Why is there little decoherence for photons?
  • · Replies 10 ·
Replies
10
Views
4K
Graduate How to compute Von Neumann entropy?
  • · Replies 7 ·
Replies
7
Views
3K
Graduate Virtual particles and the Uncertainity Principle
  • · Replies 6 ·
Replies
6
Views
2K
Graduate Shape of the magnet in the Stern-Gerlach experiment
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Set Up Eigenspace for Particle in 1st State: nx,ny,nz
  • · Replies 7 ·
Replies
7
Views
3K
Graduate Understanding Coupled Spin Operators
  • · Replies 7 ·
Replies
7
Views
2K
Graduate Net Angular Momentum: Clarifying Confusion
  • · Replies 3 ·
Replies
3
Views
1K
Graduate Understanding S-matrix elements in QFT
  • · Replies 6 ·
Replies
6
Views
2K
Graduate How Do Matrix Representations Relate to Wave Functions in Quantum Mechanics?
  • · Replies 3 ·
Replies
3
Views
2K
Graduate Photon's change of direction of propagation
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Is it possible to do quantum mechanics without complex functions
  • · Replies 12 ·
Replies
12
Views
3K
Graduate Is there a law which prohibits measuring En of a non-stationary state
  • · Replies 6 ·
Replies
6
Views
2K
Graduate In-state: adiabatic switching vs wavepackets
  • · Replies 10 ·
Replies
10
Views
3K
Graduate Numerical solution of one dimensional Schrodinger equation
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad Molecular orbitals sigma and pi
  • · Replies 3 ·
Replies
3
Views
1K
Graduate Is Negative Mass Possible in String Theory Through Quantum Fluctuations?
  • · Replies 1 ·
Replies
1
Views
2K
Graduate What is the wave equation for the Casimir Effect and how was it derived?
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Kinetic Energy of particle in 1D and 3D well
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Retro causation in weak measurements?
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Questions about quantum fields
  • · Replies 5 ·
Replies
5
Views
2K
Graduate A Negation of the Grandfather Paradox
  • · Replies 3 ·
Replies
3
Views
2K
Graduate Differential of exponential operator
  • · Replies 2 ·
Replies
2
Views
1K
Undergrad Can someone explain Compton scattering?
  • · Replies 10 ·
Replies
10
Views
2K
Graduate Pauli exclusion principle and position-state restriction
  • · Replies 7 ·
Replies
7
Views
2K
Graduate Calculating Matrix Representation of 11><11 for 2 Qubits
  • · Replies 5 ·
Replies
5
Views
2K
Graduate Dirac Delta Function: Is delta(x-y) the Same as delta(y-x)?
  • · Replies 7 ·
Replies
7
Views
3K
Graduate Necessary axioms to derive solution to QHO problem
  • · Replies 2 ·
Replies
2
Views
1K
Graduate Multiple entangled particles and no-communication
  • · Replies 4 ·
Replies
4
Views
2K
Graduate Work Function Questions - Help Bob Find the Answer
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Angular momentum in the 3D Schrodinger eqn with a central force
  • · Replies 8 ·
Replies
8
Views
2K
Graduate No-cloning and uncertainty principle
  • · Replies 7 ·
Replies
7
Views
2K
Graduate Inconsistent Reflection and Transmission values-step potential & E < V
  • · Replies 2 ·
Replies
2
Views
1K
Graduate Help me understand a simplified CHSH (Bell's) experiment
  • · Replies 5 ·
Replies
5
Views
2K
Graduate Delbrück scattering results in ether?
  • · Replies 10 ·
Replies
10
Views
2K
Graduate Solving Matrix Eigenvalue Equation for ψ_{200} and ψ_{210} States
  • · Replies 1 ·
Replies
1
Views
1K
Undergrad How can the atomic radius of any atom be accurately calculated?
  • · Replies 8 ·
Replies
8
Views
7K
Graduate Discrete Energy Levels: Questions & Answers
  • · Replies 4 ·
Replies
4
Views
6K
Graduate Questions on the Dirac equation
  • · Replies 11 ·
Replies
11
Views
3K
Graduate General questions on the formalism of QFT
  • · Replies 5 ·
Replies
5
Views
2K
Graduate Permenance of Collapsed Wave Function Spin State
  • · Replies 6 ·
Replies
6
Views
2K
Graduate Older nuclear structure models.
  • · Replies 1 ·
Replies
1
Views
1K
Graduate Group theory and quantum mechanics
  • · Replies 2 ·
Replies
2
Views
2K
Graduate J.J. Sakurai: Error of 2nd Order in d x' Eq (1.6.24)
  • · Replies 5 ·
Replies
5
Views
3K
Undergrad Why do electrons drop energy levels?
  • · Replies 11 ·
Replies
11
Views
14K
Graduate At What Scale Does Quantum Mechanics Impact CPU Functionality?
  • · Replies 1 ·
Replies
1
Views
1K
Graduate What is the quantum anti-zeno effect?
  • · Replies 9 ·
Replies
9
Views
4K
Graduate Approx. Solution To Quantum Harmonic Oscillator for |x| large enough
  • · Replies 6 ·
Replies
6
Views
2K
Graduate Commutator expectation value in an Eigenstate
  • · Replies 19 ·
Replies
19
Views
8K
Graduate Sequential measurements of conjugate observables
  • · Replies 21 ·
Replies
21
Views
3K
Graduate Can someone explain the ignorance ensemble theory
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Will the Casimir Effect Operate Between Bolt Threads at 10nm?
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Sum of the probabilities equals 3 in bipartite covariance ?
  • · Replies 7 ·
Replies
7
Views
1K
Graduate Are two electrons in an hydrogen orbital positionally dependent ?
  • · Replies 6 ·
Replies
6
Views
2K
Graduate Is Quantum Entanglement Instantaneous for All Observers?
  • · Replies 21 ·
Replies
21
Views
4K
Graduate Entanglement entopy and area law
  • · Replies 3 ·
Replies
3
Views
2K
Graduate Simple question concerning unitary transformation
  • · Replies 3 ·
Replies
3
Views
2K
Graduate Path integrals as usually presented - what does it tell us?
  • · Replies 4 ·
Replies
4
Views
1K
Graduate Unruh Effect and Temperature Differentials
  • · Replies 5 ·
Replies
5
Views
2K
Graduate Quantization Rule for Planetary Motion?
  • · Replies 1 ·
Replies
1
Views
1K
Graduate Delayed-choice multi entanglement swapping
  • · Replies 3 ·
Replies
3
Views
2K
Graduate Dirac ket-bra simplification over here.
  • · Replies 7 ·
Replies
7
Views
2K
Graduate Hesienburg Uncertainity Principal
  • · Replies 8 ·
Replies
8
Views
2K
Graduate Superposition in the Macro World - Why Not?
  • · Replies 20 ·
Replies
20
Views
6K
Graduate QM and a new way to calculate probabilities
  • · Replies 8 ·
Replies
8
Views
2K
Graduate Help understanding molecular vs atomic electron quantum states
  • · Replies 5 ·
Replies
5
Views
2K
Graduate Ground State Energy of quantum oscillator
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Two interfering antennas with single photon radiation
  • · Replies 2 ·
Replies
2
Views
1K
Graduate When do Newtonian mechanics breakdown
  • · Replies 3 ·
Replies
3
Views
5K
Graduate Wave Function Terminology - Are these synonyms?
  • · Replies 4 ·
Replies
4
Views
1K
Graduate Conserved Charges of Stress Energy Tensor
  • · Replies 2 ·
Replies
2
Views
1K