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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.

Quantum Interpretations and Foundations

I Question about discussions around quantum interpretations

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Hilbert Spaces And Quantum Mechanics

Apr 22, 2011 · Replies 13 · Apr 29, 2011

Replies: 13

Views: 5K

Energy operator in curved space-time

Apr 27, 2011 · Replies 7 · Apr 29, 2011

Replies: 7

Views: 3K

What is the significance of 2S+1 in understanding bosons and fermions?

Apr 28, 2011 · Replies 3 · Apr 28, 2011

Replies: 3

Views: 5K

Time dependent perturbation theory for density matrix

Jul 17, 2010 · Replies 1 · Apr 28, 2011

Replies: 1

Views: 4K

Why Do We Assume Ultraviolet Divergences are Physical

Apr 20, 2011 · Replies 5 · Apr 28, 2011

Replies: 5

Views: 2K

Scattering of light on objects

Apr 28, 2011 · Replies 1 · Apr 28, 2011

Replies: 1

Views: 2K

Why is j=0 to j'=0 forbidden by the parity rule if spin orbit interaction

Apr 28, 2011 · Replies 2 · Apr 28, 2011

Replies: 2

Views: 3K

Is photon a basic unit of information?

Apr 24, 2011 · Replies 14 · Apr 28, 2011

Replies: 14

Views: 5K

Why Do Symmetry Breakings Differ with the Same Classical Lagrangian?

Apr 23, 2011 · Replies 13 · Apr 27, 2011

Replies: 13

Views: 2K

Difference between Fermions and Bosons in Feynman diagrams

Dec 7, 2007 · Replies 5 · Apr 27, 2011

Replies: 5

Views: 5K

What Does the Double Slit Experiment Reveal About Quantum Reality?

Apr 27, 2011 · Replies 2 · Apr 27, 2011

Replies: 2

Views: 1K

The Efficiency Loophole: A Local Hidden Variables Theory?

Mar 24, 2011 · Replies 70 · Apr 27, 2011

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Replies: 70

Views: 12K

Absolute Zero - No Entropy -Quantum Jiggles?

Apr 25, 2011 · Replies 8 · Apr 27, 2011

Replies: 8

Views: 4K

Quantized Radiation Field: Where Am I Wrong?

Apr 26, 2011 · Replies 12 · Apr 27, 2011

Replies: 12

Views: 2K

Simple gamma matrices question

Apr 26, 2011 · Replies 4 · Apr 27, 2011

Replies: 4

Views: 2K

Fermi energy (density of electron)

Apr 26, 2011 · Replies 1 · Apr 26, 2011

Replies: 1

Views: 3K

Virtual particles are not matter-antimatter, is it?

Apr 25, 2011 · Replies 16 · Apr 26, 2011

Replies: 16

Views: 5K

Why Represent the Photon Field with Four Potentials Instead of E and B Fields?

Mar 23, 2009 · Replies 3 · Apr 26, 2011

Replies: 3

Views: 3K

Understanding Structured Reservoirs in Decay and Markow Approximation: Explained

Apr 26, 2011 · Replies 1 · Apr 26, 2011

Replies: 1

Views: 1K

Quantum fluctuations and space

Apr 26, 2011 · Replies 2 · Apr 26, 2011

Replies: 2

Views: 2K

Deriving Exclusion Principle: Symmetric & Antisymmetric Wave Functions

Apr 7, 2011 · Replies 8 · Apr 26, 2011

Replies: 8

Views: 3K

Bell's Experiment Explained for 5th Graders

Apr 25, 2011 · Replies 16 · Apr 26, 2011

Replies: 16

Views: 3K

What makes Bose Einstein condensates so effective at slowing/stopping light?

Apr 26, 2011 · Replies 1 · Apr 26, 2011

Replies: 1

Views: 4K

Measurements corresponding to Exchange Operator

Apr 16, 2011 · Replies 9 · Apr 26, 2011

Replies: 9

Views: 4K

Representing a wavefunction using bases

Apr 11, 2011 · Replies 7 · Apr 26, 2011

Replies: 7

Views: 2K

Uncertainty Principle question

Apr 25, 2011 · Replies 4 · Apr 25, 2011

Replies: 4

Views: 2K

Note to the derivation of Dirac equation

Apr 23, 2011 · Replies 3 · Apr 25, 2011

Replies: 3

Views: 3K

What is the role of the spin variable in quantum chemistry?

Apr 22, 2011 · Replies 3 · Apr 25, 2011

Replies: 3

Views: 5K

Coherent electrons in double slit experiment?

Apr 19, 2011 · Replies 4 · Apr 25, 2011

Replies: 4

Views: 2K

Is wave-function collapse a REAL incident

Apr 19, 2011 · Replies 38 · Apr 25, 2011

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Replies: 38

Views: 7K

Gamma matrices projection operator

Apr 25, 2011 · Replies 1 · Apr 25, 2011

Replies: 1

Views: 3K

How does parity affect particle exchange in para- and ortho-hydrogen?

Apr 24, 2011 · Replies 2 · Apr 25, 2011

Replies: 2

Views: 4K

(in)coherent superposition and quantum erasure

Apr 20, 2011 · Replies 6 · Apr 25, 2011

Replies: 6

Views: 4K

Are photons packets of electronic waves such as this below

Apr 21, 2011 · Replies 5 · Apr 25, 2011

Replies: 5

Views: 4K

Substates don't evolve according to Schroedinger equation?

Apr 24, 2011 · Replies 2 · Apr 24, 2011

Replies: 2

Views: 2K

Position and Momentum: Uncovering the Mystery

Apr 24, 2011 · Replies 1 · Apr 24, 2011

Replies: 1

Views: 1K

Where Can I Find Hamiltonians of the Standard Model in QFT?

Apr 24, 2011 · Replies 2 · Apr 24, 2011

Replies: 2

Views: 3K

Does photon loose energy/mass during travel?

Apr 24, 2011 · Replies 1 · Apr 24, 2011

Replies: 1

Views: 2K

Conceptual question on measuring momentum of a particle

Apr 24, 2011 · Replies 1 · Apr 24, 2011

Replies: 1

Views: 1K

Schrödinger equation with spin term

Apr 24, 2011 · Replies 1 · Apr 24, 2011

Replies: 1

Views: 3K

What is scattering by a potential and how does it affect a passing particle?

Apr 24, 2011 · Replies 5 · Apr 24, 2011

Replies: 5

Views: 2K

How is quantum teleportation achieved through quantum entanglement?

Apr 22, 2011 · Replies 6 · Apr 24, 2011

Replies: 6

Views: 4K

Quantum Teleportation: Future Human Transportation?

Feb 20, 2006 · Replies 12 · Apr 23, 2011

Replies: 12

Views: 4K

Can We Influence the Spin of Entangled Photons?

Apr 23, 2011 · Replies 1 · Apr 23, 2011

Replies: 1

Views: 2K

Transition: Classical Mechanics to Quantum Mechanics

Apr 23, 2011 · Replies 2 · Apr 23, 2011

Replies: 2

Views: 4K

End of Uncertainty: Quantum Mechanics in Human Perspective

Apr 21, 2011 · Replies 7 · Apr 22, 2011

Replies: 7

Views: 3K

Generalized group for quantum mechanics

Apr 22, 2011 · Replies 2 · Apr 22, 2011

Replies: 2

Views: 1K

How Many Photons in a Light Wave

Apr 21, 2011 · Replies 3 · Apr 22, 2011

Replies: 3

Views: 7K

What is a application of linear sigma model?

Apr 20, 2011 · Replies 5 · Apr 22, 2011

Replies: 5

Views: 3K

Wavefunction of a single particle

Nov 30, 2010 · Replies 10 · Apr 22, 2011

Replies: 10

Views: 4K

Would like professional advice on a sci fi story.

Apr 19, 2011 · Replies 7 · Apr 22, 2011

Replies: 7

Views: 3K

Electron photographed for the first time

Apr 18, 2011 · Replies 7 · Apr 21, 2011

Replies: 7

Views: 2K

Double-Slit Experiment: Detection Without Destruction?

Apr 12, 2011 · Replies 5 · Apr 21, 2011

Replies: 5

Views: 3K

What is the significance of the infinite square well width in quantum mechanics?

Apr 21, 2011 · Replies 4 · Apr 21, 2011

Replies: 4

Views: 5K

Novice Guide to Understanding Bra-ket Notation

Apr 20, 2011 · Replies 5 · Apr 21, 2011

Replies: 5

Views: 2K

Perturbation Theory: Calculating 2nd Approx of E in Hydrogen 2s State

Apr 15, 2011 · Replies 5 · Apr 21, 2011

Replies: 5

Views: 2K

How can particles undergo EM interactions *and* have definite strong isospin?

Apr 21, 2011 · Replies 3 · Apr 21, 2011

Replies: 3

Views: 3K

Definition of 'good quantum number' after parity violation

Apr 15, 2011 · Replies 2 · Apr 21, 2011

Replies: 2

Views: 5K

Validity of Derivations of Schrödinger's Equation

Apr 20, 2011 · Replies 13 · Apr 21, 2011

Replies: 13

Views: 3K

Does the Born Rule conflict with determinism in quantum mechanics?

Apr 16, 2011 · Replies 29 · Apr 21, 2011

Replies: 29

Views: 7K

How to Grasp Quantum Mechanics and Hydrogen Models as a Physics Student?

Apr 14, 2011 · Replies 4 · Apr 20, 2011

Replies: 4

Views: 2K

Any result that conflicts with the below theory of entanglement?

Apr 19, 2011 · Replies 4 · Apr 19, 2011

Replies: 4

Views: 2K

Where Do Photons Come From and How Do They Embrace Wave-Particle Duality?

Dec 9, 2005 · Replies 10 · Apr 19, 2011

Replies: 10

Views: 4K

How does a wave function collapse?

May 20, 2010 · Replies 8 · Apr 19, 2011

Replies: 8

Views: 5K

Is There a Quantum Approach to Understanding Latent Heat?

Apr 13, 2011 · Replies 4 · Apr 19, 2011

Replies: 4

Views: 3K

Path integral formulation of non-relativistic quantum mechanics

Apr 19, 2011 · Replies 2 · Apr 19, 2011

Replies: 2

Views: 3K

Uncertainty principle with/out detectors

Apr 18, 2011 · Replies 2 · Apr 19, 2011

Replies: 2

Views: 2K

Why Is the LSZ Formula Overlooked in Some QFT Texts?

Apr 15, 2011 · Replies 7 · Apr 19, 2011

Replies: 7

Views: 9K

What's wrong with this FTL experiment?

Apr 15, 2011 · Replies 19 · Apr 19, 2011

Replies: 19

Views: 4K

Why is there no constant magnetic dipole-dipole interaction?

Apr 18, 2011 · Replies 4 · Apr 19, 2011

Replies: 4

Views: 3K

Understanding Destructive Interference in Electron Wave Functions

Apr 17, 2011 · Replies 6 · Apr 19, 2011

Replies: 6

Views: 4K

Feynman rules (vertecies) for graviton

Mar 4, 2010 · Replies 7 · Apr 18, 2011

Replies: 7

Views: 7K

Hg vapor energy levels & Frank-Hertz experiment

Jun 5, 2009 · Replies 12 · Apr 18, 2011

Replies: 12

Views: 10K

When Were Anomalous Correlations in Entangled Photons First Observed?

Apr 17, 2011 · Replies 2 · Apr 18, 2011

Replies: 2

Views: 2K

Bohr Model Postulates: Understand Discrete Angular Momentum Orbits

Apr 17, 2011 · Replies 2 · Apr 18, 2011

Replies: 2

Views: 3K

Why the minima of potential of classical Lagrangian called ''vacuum expectation''?

Apr 17, 2011 · Replies 3 · Apr 18, 2011

Replies: 3

Views: 2K

Range of Different Photoelectron Kinetic Energies?: Photoelectric Effect

Apr 16, 2011 · Replies 7 · Apr 18, 2011

Replies: 7

Views: 22K

QM Definition of Center of Mass

Apr 17, 2011 · Replies 5 · Apr 18, 2011

Replies: 5

Views: 4K

Bell tests: Singlet vs Triplet State

Apr 16, 2011 · Replies 2 · Apr 17, 2011

Replies: 2

Views: 6K

Finite-Temperature Schrödinger's equation

Apr 16, 2011 · Replies 4 · Apr 17, 2011

Replies: 4

Views: 3K

Time Independent Schrödinger equation.

Apr 15, 2011 · Replies 6 · Apr 16, 2011

Replies: 6

Views: 3K

Decoherence, Coherence, Pure State, Mixed State

Apr 10, 2011 · Replies 44 · Apr 15, 2011

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Replies: 44

Views: 11K

About Gauge invariance - again

Nov 21, 2010 · Replies 7 · Apr 15, 2011

Replies: 7

Views: 3K

Uncertainty Principle and Particle Calculation in the Past

Apr 15, 2011 · Replies 1 · Apr 15, 2011

Replies: 1

Views: 2K

Why are energy eigenstates considered wavefunctions in quantum mechanics?

Apr 15, 2011 · Replies 7 · Apr 15, 2011

Replies: 7

Views: 8K

Where do the extra particles go

Apr 14, 2011 · Replies 4 · Apr 15, 2011

Replies: 4

Views: 2K

Non-Perturbative QFT without Virtual Particles

Mar 29, 2011 · Replies 103 · Apr 15, 2011

4

Replies: 103

Views: 18K

Is time reversal broken in an atom with nonzero magnetic moment?

Apr 15, 2011 · Replies 1 · Apr 15, 2011

Replies: 1

Views: 2K

Are Fermions and Bosons Responsible for the Force Behind a Punch?

Apr 12, 2011 · Replies 5 · Apr 14, 2011

Replies: 5

Views: 2K

Quantum theory has affected technological advances?

Apr 13, 2011 · Replies 10 · Apr 14, 2011

Replies: 10

Views: 4K

Question about uncertainty princple?

Apr 13, 2011 · Replies 6 · Apr 14, 2011

Replies: 6

Views: 2K

Solving the Schrodinger equation

Apr 14, 2011 · Replies 4 · Apr 14, 2011

Replies: 4

Views: 3K

Quantum mechanics ground state

Apr 20, 2010 · Replies 6 · Apr 14, 2011

Replies: 6

Views: 11K

Understanding London Dispersion Force: Theoretical Derivation Explained

Apr 12, 2011 · Replies 3 · Apr 14, 2011

Replies: 3

Views: 4K

[Novice] Feynman Diagram for Electron Excitation

Apr 9, 2011 · Replies 16 · Apr 14, 2011

Replies: 16

Views: 7K

Far-apart double slit experiment

Apr 13, 2011 · Replies 1 · Apr 13, 2011

Replies: 1

Views: 1K

Checking if Three Operators Form a 3-Vector with SO(3) Commutation Relations

Apr 7, 2011 · Replies 3 · Apr 13, 2011

Replies: 3

Views: 2K

Sign of the gyromagnetic ratio

Jan 21, 2007 · Replies 2 · Apr 13, 2011

Replies: 2

Views: 6K

Bell violation with extra particles

Apr 13, 2011 · Replies 5 · Apr 13, 2011

Replies: 5

Views: 2K

Some lines are called resonant

Apr 10, 2011 · Replies 4 · Apr 13, 2011

Replies: 4

Views: 2K

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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