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 What is matter?
Graduate Why Does Negative Current Occur in LEDs at Low Voltage?
  • · Replies 1 ·
Replies
1
Views
1K
Undergrad Representation of numbers in quantum bits
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Need to discuss about quantum concepts
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad Why is there a peak in the visible range?
  • · Replies 2 ·
Replies
2
Views
2K
Graduate How to go from Heisenberg operators to Schrödinger operators
  • · Replies 10 ·
Replies
10
Views
3K
Undergrad Can Excess Photon Energy Cause an Electron to Jump Energy Levels?
  • · Replies 8 ·
Replies
8
Views
3K
Graduate What is the concept of multiple orthogonal time dimensions?
  • · Replies 12 ·
Replies
12
Views
4K
Graduate Plasma and light atom collision.
  • · Replies 8 ·
Replies
8
Views
2K
Graduate Question about non-relativistic limit of QFT
  • · Replies 3 ·
Replies
3
Views
3K
Graduate What determines an amplitude of a wave particle?
  • · Replies 7 ·
Replies
7
Views
5K
Graduate Unitary in quantum field theory
  • · Replies 3 ·
Replies
3
Views
2K
Graduate What happens to the freq of a photon after encountering double slit?
  • · Replies 4 ·
Replies
4
Views
2K
Graduate Controlled delayed quantum erasure?
  • · Replies 6 ·
Replies
6
Views
3K
Graduate What are the Different Formulations of Quantum Mechanics?
  • · Replies 88 ·
3
Replies
88
Views
14K
Undergrad Why introduce matrix in quantum mechanics
  • · Replies 3 ·
Replies
3
Views
2K
Graduate Is Superposition the Explanation for Bell Inequality Violations ?
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Can someone explain the diffraction of electrons through a single hole?
  • · Replies 4 ·
Replies
4
Views
2K
Graduate Scalar gravity -Feynman lectures on gravitation
  • · Replies 4 ·
Replies
4
Views
2K
Graduate Initial conditions in quantum mechanics
  • · Replies 4 ·
Replies
4
Views
6K
Graduate Quantum Mechanics Practical Scenarios
  • · Replies 5 ·
Replies
5
Views
2K
Graduate A question about Qubit (number of states)
  • · Replies 6 ·
Replies
6
Views
3K
Undergrad Difference ionic and covalent bonds
  • · Replies 4 ·
Replies
4
Views
2K
Graduate Calculating the amplitude that a particle is spin up
  • · Replies 5 ·
Replies
5
Views
2K
Graduate Variational Derivation of Schrodinger Equation
  • · Replies 6 ·
Replies
6
Views
4K
Undergrad Is Energy Quantized? - Facts & Explanation
  • · Replies 3 ·
Replies
3
Views
2K
Graduate Given a Hamiltonian how do you pick the most convenient Hilbert space?
  • · Replies 3 ·
Replies
3
Views
2K
Graduate Noether current for exchange symmetry
  • · Replies 8 ·
Replies
8
Views
2K
Graduate Schrodinger Equation for Constrained Particle
  • · Replies 12 ·
Replies
12
Views
3K
Graduate Continuous evolution from 1 eigenstate of O to another O-eigenstate?
  • · Replies 8 ·
Replies
8
Views
2K
Graduate How does quantum pseudo-telepathy work, as a quantum circuit?
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Understanding Plancks Quanta for Quantum Mechanics
  • · Replies 3 ·
Replies
3
Views
2K
Graduate Infinite Energy: Is Constant Exchange of Photons Possible?
  • · Replies 11 ·
Replies
11
Views
3K
Graduate Introductory literature, quantum mechanics
  • · Replies 1 ·
Replies
1
Views
2K
Graduate What do the Ms in ml and ms quantum numbers stand for?
  • · Replies 2 ·
Replies
2
Views
3K
Graduate Understanding Entangled Particles: Is it Possible?
  • · Replies 3 ·
Replies
3
Views
5K
Graduate Green's function of the Klein-Gordon operator
  • · Replies 4 ·
Replies
4
Views
5K
Graduate Planck's Unit and universal constants
  • · Replies 5 ·
Replies
5
Views
2K
Graduate NYT review of How the hippies saved physics
  • · Replies 22 ·
Replies
22
Views
5K
Graduate Are Thermal States Always Mixed States?
  • · Replies 4 ·
Replies
4
Views
6K
Graduate What are some examples of imperfect entanglement in spin 1/2 systems?
  • · Replies 3 ·
Replies
3
Views
2K
Graduate Solving QM-like Problem (Shankar, Coupled Mass)
  • · Replies 5 ·
Replies
5
Views
3K
Graduate Why does the tensor product in QM produce unentangled states?
  • · Replies 7 ·
Replies
7
Views
2K
Graduate Velocity of alpha particle within nucleus
  • · Replies 3 ·
Replies
3
Views
3K
Graduate How can I present my new atomic model to the scientific community?
  • · Replies 7 ·
Replies
7
Views
3K
Graduate Pasting polarized lenses to a PBS ?
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Black body radiation and maximum spectral density
  • · Replies 1 ·
Replies
1
Views
3K
Graduate Why Is a Given State an Eigenstate of Field Operators in Quantum Field Theory?
  • · Replies 5 ·
Replies
5
Views
3K
Graduate Increasing intensity causes a contradiction in classical physics?
  • · Replies 2 ·
Replies
2
Views
2K
Graduate How Does Δml=0 and Δl=±1 Apply in Quantum Mechanics?
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Linear to Circular Polarisation Questions
  • · Replies 1 ·
Replies
1
Views
3K
Graduate Is there really such a thing as a definite state?
  • · Replies 5 ·
Replies
5
Views
2K
Graduate Tensor techniques in $3\otimes\bar 3$ representation of su(3)
  • · Replies 7 ·
Replies
7
Views
4K
Graduate What is the relationship between frequency and wave function?
  • · Replies 1 ·
Replies
1
Views
3K
Graduate Quantum Computing: How Fast Could It Go?
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Why does the Klein-Gordon propagator have a negative i in the exponential?
  • · Replies 2 ·
Replies
2
Views
3K
Graduate Three-Particle Quantum Nonlocality under Strict Locality Conditions
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad Compton vs photoelectric effect.
  • · Replies 4 ·
Replies
4
Views
3K
Graduate Maximizing Time and Energy: Prioritizing QM Topics for Novice Learners
  • · Replies 1 ·
Replies
1
Views
1K
Graduate Hidden variables - Bell - The Law of Malus?
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Entanglement Between Photons that have Never Coexisted
  • · Replies 47 ·
2
Replies
47
Views
11K
Graduate How Do Infinite and Finite Light Sources Produce Different Wavefront Shapes?
  • · Replies 2 ·
Replies
2
Views
6K
Graduate How Do Entangled Particles Communicate Faster Than Light?
  • · Replies 4 ·
Replies
4
Views
2K
Graduate Heisenberg uncertainty principle and wavelength of light
  • · Replies 4 ·
Replies
4
Views
3K
Graduate Computing Wigner D-Matrices: Contradiction Found
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Quantum entanglement as a higher dimension arc?
  • · Replies 2 ·
Replies
2
Views
3K
Graduate Why does the propagator converge?
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Rydberg Blockade: Questions on Using for Single Photon Creation
  • · Replies 2 ·
Replies
2
Views
3K
Graduate What is conserved in the various forms/types of entanglement?
  • · Replies 11 ·
Replies
11
Views
2K
Graduate Delayed Choice Quantum Eraser communication
  • · Replies 5 ·
Replies
5
Views
3K
Undergrad Radiation Vectors: Wave Direction After Electron Energy Shift?
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Wave function collapse in curved spacetime
  • · Replies 9 ·
Replies
9
Views
2K
Graduate Understand the idea of superposition
  • · Replies 3 ·
Replies
3
Views
15K
Graduate Preparing entangled states, how is this possible in the simpest cases?
  • · Replies 11 ·
Replies
11
Views
3K
Graduate Are fermions truly antisymmetric in their wave function?
  • · Replies 15 ·
Replies
15
Views
5K
Graduate Can we look upon entanglement as measurement?
  • · Replies 3 ·
Replies
3
Views
2K
Graduate Proton Decay- What happens to the proton after too many decays ?
  • · Replies 2 ·
Replies
2
Views
3K
Undergrad Lorentz,gallilean transformation
  • · Replies 1 ·
Replies
1
Views
1K
Graduate Measuring Plank's constant with LED's
  • · Replies 4 ·
Replies
4
Views
2K
Graduate Photons and charged particles and dark matter
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Orthogonal eigenvectors and Green functions
  • · Replies 1 ·
Replies
1
Views
2K
Graduate New to quantum and have a few questions
  • · Replies 1 ·
Replies
1
Views
1K
Graduate Feynman Lectures: The Random Walk Explained
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Simultaneously testing the Kochen-Specker and Bell theorems
  • · Replies 4 ·
Replies
4
Views
3K
Graduate Is Entanglement Finite or Timeless in Varying Spacetime Curvature?
  • · Replies 11 ·
Replies
11
Views
3K
Graduate Why is it usually the K-shell electron that is ejected?
  • · Replies 10 ·
Replies
10
Views
8K
Graduate How do I decide that a particle is isolated?
  • · Replies 1 ·
Replies
1
Views
1K
Graduate Problem with Bell's lambda - again
  • · Replies 28 ·
Replies
28
Views
5K
Graduate Is Dark Energy Linked to Vacuum Energy in QFT?
  • · Replies 5 ·
Replies
5
Views
3K
Graduate Understanding what happens when particles have a higher energy
  • · Replies 4 ·
Replies
4
Views
2K
Graduate Space Translation: Sidney Coleman's Lectures Problem
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Eigenvector proof from Dirac's QM
  • · Replies 5 ·
Replies
5
Views
2K
Graduate Introduction to the development of Quantum Mechanics
  • · Replies 2 ·
Replies
2
Views
2K
Graduate How to Derive the Number of Components of a Rank-2A Tensor in Four Dimensions?
  • · Replies 8 ·
Replies
8
Views
3K
Graduate Cross-section for elastic scattering?
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Virtuality of a nearly on-shell photon
  • · Replies 4 ·
Replies
4
Views
2K
Graduate Quantum entanglement and relativity of time
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Bell's inequality when efficiency < 1
  • · Replies 2 ·
Replies
2
Views
1K
Graduate Non locality of quantum mechanics
  • · Replies 7 ·
Replies
7
Views
3K
Graduate Do bras and inner products relate in a Rigged Hilbert Space?
  • · Replies 9 ·
Replies
9
Views
3K
Graduate Is the Field Operator in Quantum Field Theory an Observable or a Creation Tool?
  • · Replies 2 ·
Replies
2
Views
2K