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 The atomic Coulomb potential extends to infinity?
  • · Replies 5 ·
Replies
5
Views
1K
Undergrad Defining electromagnetic waves
  • · Replies 14 ·
Replies
14
Views
1K
Undergrad How do photons transfer energy?
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad Superluminal Quantum tunneling without FTL messaging
  • · Replies 14 ·
Replies
14
Views
2K
Undergrad What do the psi_3 and psi_4 components of the Dirac equation represent?
  • · Replies 8 ·
Replies
8
Views
2K
High School Particles Within Atoms: Uncovering the Mystery of Forces and Vacuum
  • · Replies 9 ·
Replies
9
Views
2K
High School Can Entangled Particles Stay Undetermined Despite Decoherence During Separation?
  • · Replies 22 ·
Replies
22
Views
2K
High School Could a parallel universe exist?
  • · Replies 11 ·
Replies
11
Views
3K
Undergrad Any other good sources on the Lamb shift other than Wikipedia?
  • · Replies 10 ·
Replies
10
Views
2K
Undergrad What is the connection between the Lamb Shift and the g factor?
  • · Replies 2 ·
Replies
2
Views
1K
High School Why do superpositions occur? What causes them to occur?
  • · Replies 46 ·
2
Replies
46
Views
4K
Undergrad Are commuting observables necessary but not sufficient for causality?
  • · Replies 6 ·
Replies
6
Views
2K
Graduate Hamiltonian in second quantization
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad Solving Schrodinger's eqn using ladder operators for potential V
  • · Replies 4 ·
Replies
4
Views
3K
Undergrad The definition of the spectra in quantum mechanics
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad Does anyone have a collection of the Dirac Equations?
  • · Replies 1 ·
Replies
1
Views
918
Undergrad Can Dirac Delta Functional Observables Be Regarded as True Quantum Observables?
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad What is the Complex Conjugate of a Hermitian Integral in QM?
  • · Replies 7 ·
Replies
7
Views
1K
Undergrad Gauge in the Aharonov Bohm effect
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad What is the Definition of Quantum Physics?
  • · Replies 41 ·
2
Replies
41
Views
6K
High School Objective-collapse theory, collapse for large objects
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Gauge invariance confusions: symmetry vs redundancy, active vs passive
  • · Replies 47 ·
2
Replies
47
Views
6K
Undergrad Understanding Bra Ket Correspondence and Proving (1.8) Transformation
  • · Replies 3 ·
Replies
3
Views
1K
Graduate What is the point of geometric quantization?
  • · Replies 4 ·
Replies
4
Views
1K
Graduate Can Quantum Mechanics be postulated to exclude humans?
  • · Replies 44 ·
2
Replies
44
Views
5K
Undergrad What is unique about the bra in Dirac bra-ket notation?
  • · Replies 14 ·
Replies
14
Views
2K
Undergrad Physical interpretation of phase in solutions to Schrodinger's Eqn?
  • · Replies 12 ·
Replies
12
Views
5K
Undergrad Bra Ket is equivalent to inner product always?
  • · Replies 7 ·
Replies
7
Views
1K
Graduate QFT with vanishing vacuum expectation value and perturbation theory
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad Weak measurement and the measurement problem
  • · Replies 4 ·
Replies
4
Views
2K
High School Why exactly do Virtual Particles not violate Conservation of energy?
  • · Replies 16 ·
Replies
16
Views
3K
Graduate Interaction between matter and antimatter in Dirac equation
  • · Replies 5 ·
Replies
5
Views
1K
Undergrad Superposition Angle Range in 2-Slit Experiment
  • · Replies 6 ·
Replies
6
Views
802
Graduate Why we can perform normal ordering?
  • · Replies 4 ·
Replies
4
Views
2K
High School Is an experiment planned to discern determinism and randomness in QM
  • · Replies 118 ·
4
Replies
118
Views
5K
Undergrad Particle and wave model understanding -- help please
  • · Replies 5 ·
Replies
5
Views
2K
Undergrad Quantization of Quasiperiodic Orbits in the Bohr-Sommerfeld Model
  • · Replies 5 ·
Replies
5
Views
2K
Undergrad Using the Schrodinger eqn in finding the momentum operator
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad Feynman path integral and events beyond the speed of light
  • · Replies 57 ·
2
Replies
57
Views
5K
High School Can anyone help me with my high school paper on vacuum and quantum vacuum?
  • · Replies 1 ·
Replies
1
Views
960
Undergrad On the meaning and mathematics of rotating spin 1/2 particles
  • · Replies 7 ·
Replies
7
Views
2K
High School Why isn’t quantum entanglement just correlation?
  • · Replies 51 ·
2
Replies
51
Views
6K
High School Project on pulsars/electromagnetic quantum field
  • · Replies 8 ·
Replies
8
Views
2K
Undergrad Problem involving a sequential Stern-Gerlach experiment
  • · Replies 24 ·
Replies
24
Views
3K
High School Can the Motion of an Electron in Quantum Mechanics Be Reversed?
  • · Replies 29 ·
Replies
29
Views
2K
Undergrad Can light meaningfully travel an infinite distance?
  • · Replies 28 ·
Replies
28
Views
3K
Graduate Max Fidelity at $$F=|\langle\psi|\phi\rangle|^2$$
  • · Replies 26 ·
Replies
26
Views
2K
Undergrad A quasi-analogy of wave-particle duality?
  • · Replies 17 ·
Replies
17
Views
3K
Graduate Does the quantum space of states have countable or uncountable basis?
  • · Replies 67 ·
3
Replies
67
Views
7K
Graduate What are the methods for calculating quantum phase transition?
  • · Replies 2 ·
Replies
2
Views
1K
Undergrad Is time continuous or discrete in quantum physics?
  • · Replies 2 ·
Replies
2
Views
1K
Undergrad Question about Grover's algorithm
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad Why can't classical models explain quantum entanglement?
  • · Replies 10 ·
Replies
10
Views
1K
Graduate Is wave-matter duality a proven theory?
  • · Replies 58 ·
2
Replies
58
Views
6K
Graduate Quantum linear code/ Dual Code (CSS) proof
  • · Replies 3 ·
Replies
3
Views
1K
Undergrad Quantum spin, wavelength and frequency
  • · Replies 17 ·
Replies
17
Views
2K
Undergrad Math of Electron Double Slit Experiment
  • · Replies 4 ·
Replies
4
Views
1K
High School Bell Test Configuration Question
  • · Replies 3 ·
Replies
3
Views
1K
Graduate What Does Constant Fidelity in Quantum States Imply?
  • · Replies 1 ·
Replies
1
Views
1K
Undergrad ##H=i\hbar\frac{d}{dt}## is weird
  • · Replies 13 ·
Replies
13
Views
1K
Undergrad Parity Operator in 2D: Understanding Transformation & Spin
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad Do measurements modify angular momentum and energy?
  • · Replies 17 ·
Replies
17
Views
2K
High School Copenhagen Interpretation and collapse moment
  • · Replies 2 ·
Replies
2
Views
1K
Undergrad Is the Vacuum Truly Empty or Just an Illusion?
  • · Replies 31 ·
2
Replies
31
Views
3K
Graduate Fidelity for quantum state at t=0
  • · Replies 21 ·
Replies
21
Views
2K
Graduate Is the Higgs Field Responsible for Microscopic Gravitational Effects?
  • · Replies 24 ·
Replies
24
Views
3K
Undergrad Explaining Quantum States: Global Phase
  • · Replies 6 ·
Replies
6
Views
3K
Undergrad Derivatives for a density operator
  • · Replies 1 ·
Replies
1
Views
2K
High School Planck Length 1 Detector? Emitter?
  • · Replies 35 ·
2
Replies
35
Views
3K
Graduate Are these papers on Quantum Electrodynamics true?
  • · Replies 2 ·
Replies
2
Views
1K
Undergrad Question about the Feynmann-Stuckelberg interpretation
  • · Replies 2 ·
Replies
2
Views
1K
Undergrad Schrödinger wave function: How to use it to get 3-D atomic orbitals?
  • · Replies 11 ·
Replies
11
Views
2K
Undergrad What types of forces are described in the standard minimal QED Lagrangian?
  • · Replies 6 ·
Replies
6
Views
2K
High School Is quantum coherence a random event?
  • · Replies 23 ·
Replies
23
Views
2K
High School What Happens When a Photon’s Superposition Encounters a Black Hole?
  • · Replies 12 ·
Replies
12
Views
2K
Undergrad Blackbody radiation in quantum mechanics
  • · Replies 4 ·
Replies
4
Views
1K
Undergrad What are the Misconceptions Surrounding Virtual Particles?
  • · Replies 17 ·
Replies
17
Views
2K
Undergrad Decoherence and direction of causality
  • · Replies 1 ·
Replies
1
Views
1K
Graduate Simple S matrix example in Coleman's lectures on QFT
  • · Replies 3 ·
Replies
3
Views
2K
Graduate Is there still a collapse problem after decoherence?
  • · Replies 7 ·
Replies
7
Views
2K
Graduate Anharmonic oscillators with closed-form solutions
  • · Replies 10 ·
Replies
10
Views
1K
Graduate Fidelity between initial and final states
  • · Replies 85 ·
3
Replies
85
Views
5K
Undergrad Nature of Collision in Compton Scattering
  • · Replies 4 ·
Replies
4
Views
1K
Undergrad What is the origin of translational motion?
  • · Replies 10 ·
Replies
10
Views
1K
Undergrad The Meaning of Basis States in Quantum Mechanics
  • · Replies 8 ·
Replies
8
Views
3K
Graduate Could QM Arise From Wilson's Ideas
  • · Replies 115 ·
4
Replies
115
Views
9K
Graduate Knill-Laflamme condition Shors code
  • · Replies 1 ·
Replies
1
Views
1K
Undergrad Are density matrices part of a real vector space?
  • · Replies 9 ·
Replies
9
Views
2K
Undergrad Momentum in electromagnetic waves
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad Feynman's description of the quantum behaviour of an ammonia molecule
  • · Replies 11 ·
Replies
11
Views
2K
High School Do eigenstate probabilities change with time?
  • · Replies 2 ·
Replies
2
Views
1K
High School Could Spontaneous symmetry breaking cause momentum change in an atom?
  • · Replies 4 ·
Replies
4
Views
1K
Undergrad Vacuum energy and Energy conservation
  • · Replies 3 ·
Replies
3
Views
1K
High School Is quantum superposition involved in the Stern-Gerlach experiment?
  • · Replies 10 ·
Replies
10
Views
2K
Undergrad Determining Momentum from Wavefunction
  • · Replies 13 ·
Replies
13
Views
2K
High School How does quantum superposition really work?
  • · Replies 4 ·
Replies
4
Views
1K
Undergrad Uncertainty principle equation for virtual particles
  • · Replies 6 ·
Replies
6
Views
2K
Undergrad What is the quantum spin of a single electron in an (atomic) orbital?
  • · Replies 1 ·
Replies
1
Views
1K
Graduate How to derive the Momentum and Energy Operators from first principles?
  • · Replies 3 ·
Replies
3
Views
3K
Undergrad Developing Quantum Expressions using QUBO
  • · Replies 1 ·
Replies
1
Views
814