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

Undergrad Valid local explanation of Bell violations? (Pegg et al., 1999; 2008)
Undergrad Definition of a Degenerate Subspace (QM)
  • · Replies 12 ·
Replies
12
Views
3K
High School How does the double slit experimental apparatus actually work?
  • · Replies 7 ·
Replies
7
Views
2K
Double slit experiment with magnetic traps
  • · Replies 33 ·
2
Replies
33
Views
3K
High School Adjoint Operation in Shankar's "Principles of Quantum Mechanics
  • · Replies 13 ·
Replies
13
Views
2K
Undergrad The density of states independent of Boundary Conditions
  • · Replies 4 ·
Replies
4
Views
1K
Undergrad Valley degeneracy in tunneling current
  • · Replies 1 ·
Replies
1
Views
1K
Graduate Effect of Spin on Vacuum Energy
  • · Replies 25 ·
Replies
25
Views
3K
Undergrad Is there some agreement on properties of a theory of quantum gravity?
  • · Replies 2 ·
Replies
2
Views
1K
Undergrad What is an Eigenstate? Simple Explanation
  • · Replies 5 ·
Replies
5
Views
4K
Undergrad Confused by Notation? Perturbation Theory Explained
  • · Replies 1 ·
Replies
1
Views
1K
Undergrad Conjugate variables: two descriptions (Link?)
  • · Replies 7 ·
Replies
7
Views
1K
High School Quantum Computing for Beginners: Understanding Double Hadamard Gates
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Relationship between a Lie group such as So(3) and its Lie algebra
  • · Replies 6 ·
Replies
6
Views
2K
High School What is the significance of 'i' in quantum computation notation?
  • · Replies 7 ·
Replies
7
Views
2K
High School Is sunlight through gaps in leaves during an eclipse decohered?
  • · Replies 4 ·
Replies
4
Views
1K
Undergrad When does the exchange operator commute with the Hamiltonian
  • · Replies 13 ·
Replies
13
Views
4K
High School We can't unite QM with GR because of what the Qfield is capable of
  • · Replies 3 ·
Replies
3
Views
1K
Undergrad Heisenberg Uncertainty: simple explanation required please
  • · Replies 5 ·
Replies
5
Views
1K
High School How do orthogonal waves interfere?
  • · Replies 6 ·
Replies
6
Views
2K
Undergrad Understanding algorithmic information theory's reality
  • · Replies 2 ·
Replies
2
Views
1K
Graduate Commutation relations between HO operators | QFT; free scalar field
  • · Replies 10 ·
Replies
10
Views
2K
Graduate Stone's theorem on one-parameter unitary groups and new observables?
  • · Replies 2 ·
Replies
2
Views
1K
Undergrad Rotation problem in Quantum Mechanics
  • · Replies 10 ·
Replies
10
Views
2K
Undergrad Von Neumann entropy for "similar" pvm observables
  • · Replies 2 ·
Replies
2
Views
1K
Undergrad Is the potential energy always negative in the ground state of a hydrogen atom?
  • · Replies 12 ·
Replies
12
Views
2K
High School Emission from a coated cathode and tunneling
  • · Replies 2 ·
Replies
2
Views
1K
Graduate What Conditions Allow the Derivative Trick for Evaluating Fermionic Commutators?
  • · Replies 4 ·
Replies
4
Views
2K
Graduate How effective can QM be to understand the mind and/or consciousness?
  • · Replies 13 ·
Replies
13
Views
2K
Undergrad Question on the SG (Stern-Gerlach) Spin experiment
  • · Replies 8 ·
Replies
8
Views
2K
Graduate Unraveling the Mystery of Coherent States for Graduate Students
  • · Replies 11 ·
Replies
11
Views
3K
High School Can we measure any two of the energy, momentum or mass simultaneously?
  • · Replies 10 ·
Replies
10
Views
2K
Graduate Understanding Hermiticity of Actions in QFT for Checking and Confirming
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad Imaginary Residuals in Solving the Schrodinger Equation
  • · Replies 5 ·
Replies
5
Views
1K
Undergrad Orbits from Orbitals: Maximally Commuting Operators & Coherent States
  • · Replies 12 ·
Replies
12
Views
2K
Graduate Lorentz Transformations and Angular momentum | Tong's QFT notes
  • · Replies 6 ·
Replies
6
Views
2K
Undergrad Form of the Standard Model: Higgs-Fermion Yukawa Coupling
  • · Replies 11 ·
Replies
11
Views
2K
Graduate Superficial Degree of Divergence in Renormalization of Phi^3 Theory
  • · Replies 2 ·
Replies
2
Views
3K
Undergrad How to determine ##\psi(x,0)## in general situation?
  • · Replies 1 ·
Replies
1
Views
1K
Undergrad Scalar Hamiltonian and electromagnetic transitions
  • · Replies 5 ·
Replies
5
Views
1K
Undergrad What does it mean to influence a quantum measurement's outcome?
  • · Replies 23 ·
Replies
23
Views
2K
Undergrad Bell's theorem : pre- and post-digitization
  • · Replies 1 ·
Replies
1
Views
1K
High School What Are the Best References for Delayed Eraser Experiments with Electrons?
  • · Replies 5 ·
Replies
5
Views
1K
High School Understanding Electron Spins: A High Schooler's Guide”
  • · Replies 11 ·
Replies
11
Views
1K
Undergrad Proof of Commutator Operator Identity
  • · Replies 7 ·
Replies
7
Views
3K
Undergrad Planck's law in wavenumber vs. wavelength
  • · Replies 20 ·
Replies
20
Views
5K
Undergrad What is the name for the Heisenberg uncertainty principle?
  • · Replies 15 ·
Replies
15
Views
2K
Undergrad Significance of the Exchange Operator commuting with the Hamiltonian
  • · Replies 9 ·
Replies
9
Views
2K
Graduate Renormalization Conditions of QED
  • · Replies 3 ·
Replies
3
Views
2K
High School Where is the quantization term in Planck's Law?
  • · Replies 9 ·
Replies
9
Views
2K
Undergrad Quantum fluctuation and classical physics
  • · Replies 7 ·
Replies
7
Views
2K
Graduate Electron frequency components during orbital tunneling
  • · Replies 2 ·
Replies
2
Views
1K
Graduate Dirac Propagator: Learn to Reach 8.2
  • · Replies 7 ·
Replies
7
Views
2K
Undergrad Why the statistics for a real gas are not quantum in nature?
  • · Replies 5 ·
Replies
5
Views
1K
High School Mach-Zehnder Experiment: Wave-Particle Duality Demonstrated
  • · Replies 11 ·
Replies
11
Views
2K
Undergrad Steering the polarization of entangled photons
  • · Replies 4 ·
Replies
4
Views
1K
Undergrad Probability density expansion
  • · Replies 5 ·
Replies
5
Views
1K
High School How do quantum computers find a solution?
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad A qualitative question about Blackbody Radiation
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad Effect of inserting an analyzer loop in the EPR experiment
  • · Replies 3 ·
Replies
3
Views
1K
Undergrad What's the importance of the squared of the angular momentum?
  • · Replies 4 ·
Replies
4
Views
1K
High School Entanglement - lack of "symmetry" in no-hidden variables explanation
  • · Replies 44 ·
2
Replies
44
Views
5K
Graduate Quantum biology - photosynthesis
  • · Replies 3 ·
Replies
3
Views
1K
High School How does the observed version of the double slit get by without math?
  • · Replies 15 ·
Replies
15
Views
1K
Undergrad Entanglement setup that shouldn't allow for the transmission of info
  • · Replies 2 ·
Replies
2
Views
1K
Undergrad Commutator's Matrix representation
  • · Replies 11 ·
Replies
11
Views
2K
Undergrad What is the cross section of a graviton?
  • · Replies 18 ·
Replies
18
Views
5K
Graduate Annihilation creation operators in case of half H.oscillator
  • · Replies 14 ·
Replies
14
Views
3K
Undergrad Decoupling of angular momentum
  • · Replies 4 ·
Replies
4
Views
1K
Graduate What is the Corrected Heisenberg Limit for Phase Estimation Measurements?
  • · Replies 3 ·
Replies
3
Views
1K
Undergrad Topological quantum physics - spin statistics
  • · Replies 1 ·
Replies
1
Views
945
High School Where do virtual particles come from?
  • · Replies 9 ·
Replies
9
Views
2K
Undergrad Why Does Equation (5) in Bell's Paper Use < σ⋅a > = 1 - 2θ'/π?
  • · Replies 2 ·
Replies
2
Views
1K
Undergrad Will thermal disturbance change an atom's spin?
  • · Replies 5 ·
Replies
5
Views
1K
Undergrad Vector addition in spin orbit coupling
  • · Replies 7 ·
Replies
7
Views
2K
Undergrad Why Won't Observation in a 2 Slit Experiment Cause 1 Slit Diffraction?
  • · Replies 39 ·
2
Replies
39
Views
5K
Undergrad Why do we observe an electron both as a wave and as a particle ?
  • · Replies 3 ·
Replies
3
Views
946
High School Multiple Sequential Delayed Choice Experiment
  • · Replies 5 ·
Replies
5
Views
2K
Undergrad Energy of massless particles before electroweak symmetry breaking
  • · Replies 2 ·
Replies
2
Views
1K
High School Interesting Book On The History Of QM And Einstein's Role
  • · Replies 7 ·
Replies
7
Views
2K
Undergrad How can a photon "stimulate emission" if it really does (Einstein coefficients)
  • · Replies 11 ·
Replies
11
Views
2K
High School Detecting a photon passing through a slit without destroying it?
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad Gauge Transformations and the Covariant Derivative
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Does classical mechanics apply to the quantum world at all?
  • · Replies 26 ·
Replies
26
Views
3K
Undergrad Use of the Beam Splitter Operator
  • · Replies 4 ·
Replies
4
Views
3K
Undergrad Photon Bell Experiment, what happens in a single case?
  • · Replies 4 ·
Replies
4
Views
1K
Undergrad Scatter radiation and film fogging
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad On-shell virtual particles and 'physical' Hilbert spaces....
  • · Replies 7 ·
Replies
7
Views
2K
Undergrad Is a bipartite system necessary for the proof of the PBR theorem?
  • · Replies 2 ·
Replies
2
Views
1K
Undergrad What do we do with the massive scalar quantum field in QFT?
  • · Replies 15 ·
Replies
15
Views
2K
Undergrad Why induction requires a magnetic material to produce a current
  • · Replies 7 ·
Replies
7
Views
2K
High School Compton Effect -- Why is the electron considered to initially be at rest?
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad Physical meaning of ##\psi_1(x)\hat{A}\psi_2(x)##
  • · Replies 11 ·
Replies
11
Views
2K
Graduate Diagonalization of 2x2 Hermitian matrices using Wigner D-Matrix
  • · Replies 4 ·
Replies
4
Views
4K
Graduate Two Different Fock State Inputs into a Beam Splitter
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad Blackbody Radiation: Questions Answered on Causes & Oscillators
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad How is the information of a change in position of a star transmitted?
  • · Replies 2 ·
Replies
2
Views
1K
Graduate S-matrix expansion and Wick's theorem
  • · Replies 1 ·
Replies
1
Views
1K
Undergrad Field Renormalization vs. Interaction Picture
  • · Replies 39 ·
2
Replies
39
Views
5K
Graduate Photoelectric effect at metal junctions
  • · Replies 4 ·
Replies
4
Views
1K
Graduate Complex Numbers Not Necessary in QM: Explained
  • · Replies 219 ·
8
Replies
219
Views
24K