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Quantum Physics Forum

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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High School Guidelines for Quantum Physics Forum

  • Greg Bernhardt
  • Oct 1, 2019 Replies 0 Oct 1, 2019
Replies
0

Graduate Measurement and expectation value

  • hokhani
  • Aug 7, 2026 Replies 20 Monday, 7:33 AM
Replies
20

Graduate Is the deformation in Eq. 56 really innocuous?

  • Roberto Pavani
  • Sunday, 2:51 AM Replies 15 Monday, 4:49 AM
Replies
15

Undergrad Radiation in classical and quantum mechanics

  • hokhani
  • Aug 6, 2026 Replies 11 Sunday, 5:01 AM
Replies
11

High School Building intuition for waves (& quantum waves)

  • Aditya2725
  • Thursday, 6:27 AM Replies 4 Saturday, 4:42 PM
Replies
4

Graduate Numerical implementation of creation and annhilation operators in the SSH model

  • JangMilad
  • May 13, 2025 Replies 1 Saturday, 12:16 AM
Replies
1

Graduate Position vs momentum measurement

  • hokhani
  • Aug 4, 2026 Replies 13 Thursday, 2:07 PM
Replies
13
  • Featured

Undergrad How does a cloud chamber respond to 2-slit interference?

  • renormalize
  • Aug 11, 2026 Replies 16 Aug 12, 2026
Replies
16

Graduate Time evolution of a detected particle

  • hokhani
  • Jul 21, 2026 Replies 33 Aug 11, 2026
2
Replies
33

Graduate Determining Angular Distributions in Decays

  • electronquark
  • Aug 10, 2026 Replies 0 Aug 10, 2026
Replies
0

Graduate Is the future set to repeat?

  • KaidaAida
  • Aug 9, 2026 Replies 1 Aug 9, 2026
Replies
1
Replies
12

Graduate My questions about QFT and the standard model

  • planck999
  • Aug 6, 2026 Replies 1 Aug 6, 2026
Replies
1

Undergrad Discrepancy in uncertainty among various operators

  • hokhani
  • Aug 2, 2026 Replies 16 Aug 4, 2026
Replies
16

Graduate Gerry and Knight solution to single-mode Maxwell equation

  • Kekeedme
  • Jul 8, 2026 Replies 4 Aug 1, 2026
Replies
4

Undergrad Momentum measurement and uncertainty

  • hokhani
  • Jul 31, 2026 Replies 49 Aug 1, 2026
2
Replies
49

Undergrad Single-photon double-slit with multiple apparatus?

  • aletheia
  • Jul 27, 2026 Replies 31 Jul 31, 2026
2
Replies
31

Undergrad Particles' Intrinsic Properties in QFT

  • LarryS
  • Jun 24, 2026 Replies 21 Jul 23, 2026
Replies
21

Undergrad How do you apply perturbation theory to a magnetic field Hamiltonian?

  • Danielk010
  • Apr 6, 2026 Replies 5 Jul 20, 2026
Replies
5

High School Schrodinger's Ad-Hoc Definition Of The Wave Function

  • bhobba
  • Jul 9, 2026 Replies 1 Jul 13, 2026
Replies
1

High School Neon bleeding issue with lasers

  • Josiah
  • Jul 10, 2026 Replies 3 Jul 10, 2026
Replies
3

Undergrad Dissecting entanglement

  • zonde
  • Jul 6, 2026 Replies 6 Jul 7, 2026
Replies
6

Graduate Penrose-Dosi Model

  • Ssnow
  • Jun 1, 2026 Replies 8 Jul 5, 2026
Replies
8

High School Reducing loss of energy for Lasers

  • Josiah
  • Jul 4, 2026 Replies 14 Jul 5, 2026
Replies
14

Undergrad Entanglement might be the result of an underlying law?

  • wavering
  • Oct 16, 2025 Replies 33 Jul 1, 2026
2
Replies
33

Undergrad Uncertainty and particle in a box

  • hokhani
  • Jun 29, 2026 Replies 6 Jun 30, 2026
Replies
6

Undergrad Can reflecting a laser back on itself increase its power?

  • Josiah
  • Jun 11, 2026 Replies 19 Jun 16, 2026
Replies
19

Undergrad Photons and free quantum particles

  • hokhani
  • Jun 7, 2026 Replies 5 Jun 9, 2026
Replies
5

Undergrad How can light be a wave and particle at the same time?

  • gronk
  • Jun 2, 2026 Replies 12 Jun 5, 2026
Replies
12

High School Does entanglement synchronization change with distance in general relativity?

  • SchrodingersRat
  • May 14, 2026 Replies 15 Jun 4, 2026
Replies
15

Undergrad Application of the Schrdinger Equation in Modeling the Hydrogen Atom

  • Sandra Jane
  • Jun 3, 2026 Replies 5 Jun 3, 2026
Replies
5
Replies
6

High School Electron absorbs photon, but what happens to the photon?

  • paddyc
  • Mar 15, 2025 Replies 20 May 29, 2026
Replies
20

Graduate as angular rigidity of the electron: references?

  • Roberto Pavani
  • May 22, 2026 Replies 8 May 23, 2026
Replies
8

Graduate Magnetic monopole vs (g-2)

  • Roberto Pavani
  • May 20, 2026 Replies 3 May 20, 2026
Replies
3

High School On electron orbitals

  • BadgerBadger92
  • May 19, 2026 Replies 4 May 19, 2026
Replies
4

Undergrad What empirical observation supports the axiom of continuous spacetime?

  • swissgirl1999 Refer
  • May 13, 2026 Replies 23 May 19, 2026
Replies
23

Undergrad Questions: Multi-particle entanglement, speed of light, electron orbitals

  • MDH72
  • May 14, 2026 Replies 5 May 15, 2026
Replies
5

Graduate Gauge conditions in interaction theory

  • Haorong Wu
  • May 6, 2026 Replies 6 May 6, 2026
Replies
6

Graduate Relationship between superconductors and gravity

  • Josiah
  • May 4, 2026 Replies 4 May 5, 2026
Replies
4

Graduate Six Textbook Mistakes in Quantum Field Theory

  • Muu9
  • May 4, 2026 Replies 6 May 5, 2026
Replies
6

Undergrad Particle field strength and sensitivity

  • snorkack
  • May 12, 2025 Replies 2 May 5, 2026
Replies
2

High School Seemingly odd quantum tunneling

  • DanteKennedy
  • Apr 29, 2026 Replies 33 May 2, 2026
2
Replies
33

High School Can entangled photons be treated as single spatially extended objects?

  • Aloiz Burher
  • Apr 29, 2026 Replies 8 May 1, 2026
Replies
8

Graduate Gravitons

  • Josiah
  • Apr 30, 2026 Replies 2 Apr 30, 2026
Replies
2

Undergrad What effect do gravitons have on electrons?

  • Josiah
  • Nov 16, 2023 Replies 19 Apr 30, 2026
Replies
19

High School Does quantum collapse research support collapse as a physical mechanism?

  • ojitojuntos
  • Apr 28, 2026 Replies 6 Apr 29, 2026
Replies
6

Undergrad Do elliptical patterns connect quark behavior to orbital mechanics?

  • mayflowers
  • Apr 23, 2026 Replies 4 Apr 24, 2026
Replies
4

Undergrad Why is a Gaussian function used to represent a wave packet?

  • LarryS
  • Apr 13, 2026 Replies 4 Apr 16, 2026
Replies
4

High School Gravitons/Gravity passing through objects

  • Josiah
  • Apr 4, 2026 Replies 11 Apr 11, 2026
Replies
11

Undergrad Ramsauer and Townsend effect: history and explanation

  • haushofer
  • Apr 7, 2026 Replies 1 Apr 8, 2026
Replies
1

Undergrad Prof Mike Wiest's proposed link between quantum and consciousness

  • nomadreid
  • Oct 15, 2025 Replies 19 Apr 7, 2026
Replies
19

Undergrad ##r-##independent angular momentum in quantum mechanics

  • hokhani
  • Feb 27, 2026 Replies 16 Mar 29, 2026
Replies
16

Undergrad How do you derive $x = ihbar d/dp$? Why does this equation hold true?

  • Danielk010
  • Mar 29, 2026 Replies 2 Mar 29, 2026
Replies
2

High School Needs explanation for P in quantum tunneling formula

  • DanteKennedy
  • Mar 21, 2026 Replies 14 Mar 27, 2026
Replies
14

High School Trivial quantum entanglement question (from a rookie)

  • DanteKennedy
  • Mar 27, 2026 Replies 1 Mar 27, 2026
Replies
1

Graduate Why does QM split into two evolution types?

  • Thor Jackson
  • Mar 25, 2026 Replies 7 Mar 25, 2026
Replies
7

Graduate Super fluids and superconductors at the molecular level

  • Josiah
  • Mar 25, 2026 Replies 1 Mar 25, 2026
Replies
1

High School Classic question regarding the nature of quantum tunneling

  • DanteKennedy
  • Mar 20, 2026 Replies 14 Mar 21, 2026
Replies
14

High School Knowledge and information in the physical world

  • geordief
  • Mar 15, 2026 Replies 16 Mar 18, 2026
Replies
16

Undergrad Proving momentum expectation value shifts by p under phase transformation

  • Danielk010
  • Mar 13, 2026 Replies 4 Mar 13, 2026
Replies
4

Undergrad The equivalent concept of phase change in classical mechanics

  • hokhani
  • Mar 3, 2026 Replies 9 Mar 9, 2026
Replies
9

Graduate Quantum properties and Van Hove singularty

  • Shugart
  • Mar 9, 2026 Replies 5 Mar 9, 2026
Replies
5

Undergrad How do bar detectors work in gravitational wave detectors?

  • Josiah
  • Feb 24, 2026 Replies 7 Mar 2, 2026
Replies
7

High School Photoelectric and summation of photons energy

  • hokhani
  • Feb 26, 2026 Replies 8 Feb 26, 2026
Replies
8

Undergrad 2D rotation and angular momentum uncertainty

  • hokhani
  • Feb 23, 2026 Replies 5 Feb 24, 2026
Replies
5
Replies
2

Graduate Exact symmetry, quantum states, and symmetric dynamics

  • jj90
  • Feb 8, 2026 Replies 8 Feb 9, 2026
Replies
8

Undergrad Necessary conditions for the uncertainty principle

  • andresB
  • Feb 5, 2026 Replies 7 Feb 8, 2026
Replies
7

Undergrad Why aren't photons from a laser considered entangled?

  • LarryS
  • Feb 5, 2026 Replies 4 Feb 7, 2026
Replies
4

High School Interesting paper on QM in Scientific American

  • bhobba
  • Jan 29, 2026 Replies 12 Feb 5, 2026
Replies
12

Graduate Avalanche photon detectors

  • Hop-AC8NS
  • Feb 2, 2026 Replies 0 Feb 2, 2026
Replies
0

Graduate Consistency of Relativistic QM

  • bhobba
  • Jan 12, 2026 Replies 12 Jan 22, 2026
Replies
12

High School Can gravitons be detected?

  • Josiah
  • May 9, 2025 Replies 42 Jan 21, 2026
2
Replies
42

Graduate Some derivation in QFT in Curved SpaceTime by Birrell and Davies

  • mad mathematician
  • Jan 14, 2026 Replies 2 Jan 15, 2026
Replies
2

Undergrad The imaginary part of the wave function

  • LarryS
  • Dec 24, 2025 Replies 6 Jan 14, 2026
Replies
6

Graduate Wavefunction in the context of quantum physics

  • cianfa72
  • Jan 4, 2026 Replies 16 Jan 8, 2026
Replies
16

Graduate Is the 2-qubit singlet state invariant under bilateral projections?

  • QuantumExplorer
  • Dec 23, 2025 Replies 8 Jan 6, 2026
Replies
8

Undergrad Why do detected electrons still show diffraction patterns at slits?

  • PhysicsIsReallyFun
  • Nov 30, 2025 Replies 10 Jan 2, 2026
Replies
10

Undergrad Which-Path from Global Momentum Measurement in Double Slit

  • wnvl2
  • Dec 31, 2025 Replies 3 Jan 1, 2026
Replies
3

Graduate Two equivalent statements of time reversal symmetric Hamiltonian

  • hokhani
  • Dec 20, 2025 Replies 13 Dec 23, 2025
Replies
13

Insights Quantum Entanglement is a Kinematic Fact, not a Dynamical Effect

  • Greg Bernhardt
  • Sep 2, 2025 Replies 22 Dec 23, 2025
Replies
22

Undergrad Hooke's law: Constructing a force operator for electron orbitals?

  • Vectronix
  • Dec 18, 2025 Replies 1 Dec 18, 2025
Replies
1

Undergrad What forces a magnet's field to track the rotation of the magnet?

  • Swamp Thing
  • Dec 12, 2025 Replies 1 Dec 14, 2025
Replies
1

Undergrad Klein-Gordon equation in the nonrelativistic limit

  • George Keeling
  • Dec 9, 2025 Replies 3 Dec 13, 2025
Replies
3

Undergrad Antilinear Operators

  • hokhani
  • Nov 17, 2025 Replies 11 Dec 6, 2025
Replies
11

Undergrad Entanglement swapping in the context of Indivisible Stochastic Process

  • JonAce73
  • Dec 4, 2025 Replies 2 Dec 5, 2025
Replies
2

Undergrad HUP in condensates?

  • LarryS
  • Nov 30, 2025 Replies 1 Nov 30, 2025
Replies
1

Graduate Problem while simulating spin polarized interacting SSH model

  • Dhiman9163
  • Jun 15, 2025 Replies 1 Nov 30, 2025
Replies
1

High School Is it correct to state that all measurements count photons?

  • Chiara
  • Nov 27, 2025 Replies 11 Nov 28, 2025
Replies
11

High School Where does the extra mass reside in an excited atom?

  • Swamp Thing
  • Nov 27, 2025 Replies 9 Nov 28, 2025
Replies
9

Undergrad Angular Momentum Vector and Its Magnitude

  • hokhani
  • Nov 8, 2025 Replies 14 Nov 24, 2025
Replies
14

Undergrad Antiproton and positron annihilation

  • Sasho Andonov
  • Nov 15, 2025 Replies 2 Nov 15, 2025
Replies
2

Undergrad Can a delayed choice apparatus prevent observation of entangled photons?

  • cgsanderson
  • Nov 13, 2025 Replies 6 Nov 14, 2025
Replies
6

Undergrad Why do non-colinear Lorentz boosts imply particles must have spin?

  • LarryS
  • Sep 15, 2025 Replies 4 Nov 9, 2025
Replies
4

Undergrad Can (ordo) Fermions convert to Bosons?

  • RobbyQ
  • Nov 7, 2025 Replies 5 Nov 9, 2025
Replies
5

Undergrad Why do different inner product notations seem inconsistent?

  • nomadreid
  • Nov 3, 2025 Replies 6 Nov 4, 2025
Replies
6

Undergrad The Power of QM and QFT

  • bhobba
  • Oct 27, 2025 Replies 4 Oct 27, 2025
Replies
4

Undergrad Importance of Hanbury Brown and Twiss experiment

  • qnach
  • Oct 22, 2025 Replies 13 Oct 23, 2025
Replies
13

sidebar

Quantum Physics

Quantum physics, or quantum mechanics, is a branch of physics that explores the behavior of matter and energy at the smallest scales, where classical physics principles break down. It introduces the concept of quantization, suggesting that certain properties, such as energy levels, are quantized and can only exist in discrete values.

Quantum mechanics encompasses wave-particle duality, where particles like electrons exhibit both wave and particle characteristics. The theory is probabilistic, relying on probability amplitudes to predict outcomes, and features phenomena like superposition, where particles can exist in multiple states simultaneously.

Quantum physics has transformed our understanding of the microscopic world, leading to technologies like transistors and lasers, and continues to provoke profound questions about the nature of reality and the role of observation in shaping it.
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