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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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Is radioactive decay reversible in time?

Feb 22, 2013 · Replies 2 · Feb 22, 2013

Replies: 2

Views: 5K

Quantum Communication: Two-Way Messaging Without Physical Link?

Feb 21, 2013 · Replies 3 · Feb 22, 2013

Replies: 3

Views: 2K

Is the Book's Photon Calculation Off by a Factor of 1000?

Feb 22, 2013 · Replies 5 · Feb 22, 2013

Replies: 5

Views: 3K

Heisenberg's uncertainty principle invalidated?

Feb 21, 2013 · Replies 23 · Feb 22, 2013

Replies: 23

Views: 4K

Questions about entanglement from a non-physicist

Feb 21, 2013 · Replies 12 · Feb 22, 2013

Replies: 12

Views: 2K

Interference pattern calculations for unequal slits per QM theory

Feb 14, 2013 · Replies 5 · Feb 22, 2013

Replies: 5

Views: 3K

Isomorphism symmetry group of 6j symbol

Feb 21, 2013 · Replies 4 · Feb 22, 2013

Replies: 4

Views: 2K

Simple Normalization/schrodinger equation problem

Feb 22, 2013 · Replies 1 · Feb 22, 2013

Replies: 1

Views: 1K

Diffraction and Probability Amplitude

Feb 21, 2013 · Replies 7 · Feb 22, 2013

Replies: 7

Views: 2K

What is Orbital Angular Momentum?

Feb 21, 2013 · Replies 3 · Feb 21, 2013

Replies: 3

Views: 5K

Quantum mechanics in multiple dimensions

Feb 20, 2013 · Replies 9 · Feb 21, 2013

Replies: 9

Views: 2K

Quantization of Energy: Planck's Constant & Standing Waves

Feb 21, 2013 · Replies 2 · Feb 21, 2013

Replies: 2

Views: 2K

Is the wave-function description of photon location incomplete?

Feb 19, 2013 · Replies 8 · Feb 21, 2013

Replies: 8

Views: 2K

Proof that all operators are linear

Feb 17, 2013 · Replies 12 · Feb 20, 2013

Replies: 12

Views: 2K

Quantum field theory, photons, and polarization.

Feb 18, 2013 · Replies 9 · Feb 20, 2013

Replies: 9

Views: 3K

The Nature of Knowledge in Quantum Mechanics

Feb 19, 2013 · Replies 30 · Feb 20, 2013

2

Replies: 30

Views: 5K

Double slit experiment - no interference in the vicinity of light

Feb 20, 2013 · Replies 2 · Feb 20, 2013

Replies: 2

Views: 2K

Fermionic Number Operator Help

Feb 16, 2013 · Replies 19 · Feb 20, 2013

Replies: 19

Views: 3K

Normalizing a wave function - how the integration is done?

Feb 18, 2013 · Replies 7 · Feb 20, 2013

Replies: 7

Views: 4K

Best way to solve Schrodinger's wave equation numerically.

Feb 18, 2013 · Replies 4 · Feb 19, 2013

Replies: 4

Views: 3K

Terms in the Yang-Mills Lagrangian

Feb 10, 2013 · Replies 17 · Feb 19, 2013

Replies: 17

Views: 4K

Helo, I am just wondering about some info I foind on the web.

Feb 19, 2013 · Replies 7 · Feb 19, 2013

Replies: 7

Views: 2K

Finding the Eigen Value of A.σ Vector Product

Feb 18, 2013 · Replies 6 · Feb 19, 2013

Replies: 6

Views: 3K

Is this a good definition of entanglement

Feb 18, 2013 · Replies 3 · Feb 18, 2013

Replies: 3

Views: 1K

Can someone give me some examples on the schrodinger equation?

Feb 18, 2013 · Replies 1 · Feb 18, 2013

Replies: 1

Views: 1K

What is the difference between a wave of water and qm wave?

Feb 17, 2013 · Replies 4 · Feb 17, 2013

Replies: 4

Views: 2K

Question about potential well schrodinger

Feb 17, 2013 · Replies 4 · Feb 17, 2013

Replies: 4

Views: 2K

Do angular momentum operators anti-commute?

Feb 16, 2013 · Replies 1 · Feb 16, 2013

Replies: 1

Views: 2K

Couple of quantum fluctuation related questions from a curious layman

Feb 16, 2013 · Replies 1 · Feb 16, 2013

Replies: 1

Views: 1K

Minimal Subsitution from Lorentz Invariance

Feb 16, 2013 · Replies 1 · Feb 16, 2013

Replies: 1

Views: 1K

Why are there multiple Slater determinants for the same number of electrons?

Feb 10, 2013 · Replies 10 · Feb 16, 2013

Replies: 10

Views: 3K

Dirac Equation: Gamma Matrices as 4-Vector Components?

Feb 15, 2013 · Replies 2 · Feb 15, 2013

Replies: 2

Views: 2K

Spin-orbit coupling for s-orbital states

Feb 10, 2013 · Replies 9 · Feb 14, 2013

Replies: 9

Views: 8K

Can Measuring One Spin Disentangle Electrons?

Feb 12, 2013 · Replies 14 · Feb 14, 2013

Replies: 14

Views: 3K

What is the physical meaning of [H,ρ ]=0 for a stationary state?

Nov 9, 2011 · Replies 6 · Feb 14, 2013

Replies: 6

Views: 3K

What is the concept behind the Uncertainty Principle?

Feb 13, 2013 · Replies 5 · Feb 14, 2013

Replies: 5

Views: 2K

Is this the HUP or diffraction?

Feb 13, 2013 · Replies 1 · Feb 13, 2013

Replies: 1

Views: 1K

P-subshell orbital of Hydrogen

Feb 12, 2013 · Replies 7 · Feb 13, 2013

Replies: 7

Views: 3K

Why are only some photons virtual?

Feb 12, 2013 · Replies 3 · Feb 13, 2013

Replies: 3

Views: 2K

Entanglement happens at what speed?

Sep 3, 2012 · Replies 4 · Feb 12, 2013

Replies: 4

Views: 2K

Born Rule Derivation: A Closer Look

Feb 12, 2013 · Replies 2 · Feb 12, 2013

Replies: 2

Views: 2K

Virtual particles vs. real particles

Feb 10, 2013 · Replies 12 · Feb 12, 2013

Replies: 12

Views: 6K

How Do Photons Mediate Attraction Between Oppositely Charged Particles?

Feb 12, 2013 · Replies 1 · Feb 12, 2013

Replies: 1

Views: 2K

Photoelectric effect - Frequency vs. Current

Feb 11, 2013 · Replies 6 · Feb 12, 2013

Replies: 6

Views: 7K

Diagonal Matrix & Perturbation Theory in Quantum Mechanics

Feb 8, 2013 · Replies 3 · Feb 12, 2013

Replies: 3

Views: 2K

Planck's Derivation of Quantization: Summation vs Integrand

Feb 11, 2013 · Replies 2 · Feb 12, 2013

Replies: 2

Views: 2K

Variational Method vs Inverse Rayleigh Method with Shifting

Feb 11, 2013 · Replies 1 · Feb 11, 2013

Replies: 1

Views: 2K

Is Bell's theorem near-sighted?

Feb 6, 2013 · Replies 20 · Feb 11, 2013

Replies: 20

Views: 4K

Is This the Correct Method for Quantizing the Scalar Field?

Feb 11, 2013 · Replies 1 · Feb 11, 2013

Replies: 1

Views: 1K

Peskin & Schroeder QFT Born Approximation reference.

Feb 9, 2013 · Replies 6 · Feb 11, 2013

Replies: 6

Views: 5K

Understanding the Bethe-Salpeter Equation: Introduction and Examples

Feb 9, 2013 · Replies 8 · Feb 11, 2013

Replies: 8

Views: 3K

Separating operators into classical + quantum

Feb 11, 2013 · Replies 3 · Feb 11, 2013

Replies: 3

Views: 1K

Radiation absorption by an atom

Feb 10, 2013 · Replies 4 · Feb 10, 2013

Replies: 4

Views: 2K

Has the double slit experiment been conducted without a detector?

Feb 9, 2013 · Replies 2 · Feb 10, 2013

Replies: 2

Views: 2K

Question about a quantum field.

Feb 2, 2013 · Replies 24 · Feb 10, 2013

Replies: 24

Views: 4K

Photons violate Uncertainty Principle?

Feb 10, 2013 · Replies 2 · Feb 10, 2013

Replies: 2

Views: 2K

Formal integration of Heissenberg equation?

Feb 8, 2013 · Replies 2 · Feb 9, 2013

Replies: 2

Views: 1K

HUB & accurate single measurement

Feb 9, 2013 · Replies 6 · Feb 9, 2013

Replies: 6

Views: 1K

Chaos Theory and Schrodinger's Cat: A Quirky Connection

Feb 9, 2013 · Replies 2 · Feb 9, 2013

Replies: 2

Views: 2K

Lorentz action on creation/annihilation operators

Feb 8, 2013 · Replies 12 · Feb 8, 2013

Replies: 12

Views: 4K

Can bodies be made to radiate at one freq.

Jan 21, 2013 · Replies 6 · Feb 8, 2013

Replies: 6

Views: 2K

Ehrenfest theorem for kinetic energy

Feb 7, 2013 · Replies 6 · Feb 8, 2013

Replies: 6

Views: 3K

Joy Christian, Disproof of Bell's Theorem

Mar 20, 2011 · Replies 253 · Feb 8, 2013

9

Replies: 253

Views: 58K

Renormalized vertex always a log?

Feb 7, 2013 · Replies 3 · Feb 8, 2013

Replies: 3

Views: 1K

What is the condition for one-dimensional motion in an infinite potential well?

Feb 1, 2013 · Replies 13 · Feb 7, 2013

Replies: 13

Views: 3K

How does quantum mechanics define time

Feb 3, 2013 · Replies 5 · Feb 6, 2013

Replies: 5

Views: 3K

Understanding Spin in Composite Systems

Feb 6, 2013 · Replies 1 · Feb 6, 2013

Replies: 1

Views: 1K

Can an electron absorb multiple photons at once?

Feb 5, 2013 · Replies 8 · Feb 6, 2013

Replies: 8

Views: 2K

What contributes to proton mass besides quark mass?

Feb 3, 2013 · Replies 12 · Feb 6, 2013

Replies: 12

Views: 2K

Probability Density and Current of Dirac Equation

Feb 4, 2013 · Replies 8 · Feb 5, 2013

Replies: 8

Views: 4K

Is Pilot Wave Theory in Conflict with the Original Matter Wave Theory?

Feb 5, 2013 · Replies 1 · Feb 5, 2013

Replies: 1

Views: 2K

Feynman’s path integral and an electron in a Penning trap

Feb 4, 2013 · Replies 3 · Feb 4, 2013

Replies: 3

Views: 2K

Evidence of single photon absorption?

Feb 3, 2013 · Replies 16 · Feb 4, 2013

Replies: 16

Views: 4K

How do I solve the Schrodinger wave equation with a differential equation?

Feb 4, 2013 · Replies 1 · Feb 4, 2013

Replies: 1

Views: 2K

Significance of Order in Feynman Diagrams

Feb 3, 2013 · Replies 2 · Feb 4, 2013

Replies: 2

Views: 2K

Quantum entanglement and the uncertainty principle

Feb 3, 2013 · Replies 1 · Feb 3, 2013

Replies: 1

Views: 2K

Implications of Heisenberg uncertainty principle

Feb 2, 2013 · Replies 2 · Feb 2, 2013

Replies: 2

Views: 2K

Regularization scheme independence?

Jan 31, 2013 · Replies 5 · Feb 2, 2013

Replies: 5

Views: 2K

How do wave-functions deal with energy (of the photon)?

Jan 30, 2013 · Replies 6 · Feb 1, 2013

Replies: 6

Views: 2K

Rigged Hilbert space, separable space, domain of CSCO, mapping

Jan 30, 2013 · Replies 29 · Feb 1, 2013

Replies: 29

Views: 8K

Publication: perpetuum mobile of fourth type

Feb 1, 2013 · Replies 1 · Feb 1, 2013

Replies: 1

Views: 1K

How does this formula relate to particle creation?

Feb 1, 2013 · Replies 2 · Feb 1, 2013

Replies: 2

Views: 1K

Composite system, rigged Hilbert space, bounded unbounded operator, CSCO, domain

Jan 31, 2013 · Replies 3 · Feb 1, 2013

Replies: 3

Views: 2K

Imposing Klein-Gordon on Dirac Equation

Jan 31, 2013 · Replies 3 · Feb 1, 2013

Replies: 3

Views: 2K

What does a quantum state represent in quantum theory?

Jan 30, 2013 · Replies 23 · Jan 31, 2013

Replies: 23

Views: 6K

How a particle tells time (Holger Mueller et al in *Science*)

Jan 17, 2013 · Replies 4 · Jan 31, 2013

Replies: 4

Views: 5K

Biological photonics: Can there be light in the brain?

Jan 31, 2013 · Replies 9 · Jan 31, 2013

Replies: 9

Views: 2K

Understanding the Derivation of the Dirac Equation in Cosmology

Jan 30, 2013 · Replies 2 · Jan 31, 2013

Replies: 2

Views: 2K

A problem about blackbody radiation

Jan 31, 2013 · Replies 3 · Jan 31, 2013

Replies: 3

Views: 1K

Atomic excitation and electron orbits

Jan 31, 2013 · Replies 1 · Jan 31, 2013

Replies: 1

Views: 2K

Rigorous definitions in quantum mechanics

Jan 27, 2013 · Replies 7 · Jan 31, 2013

Replies: 7

Views: 3K

Feynman Lectures Volume 3 Equation 9.41

Jan 30, 2013 · Replies 3 · Jan 30, 2013

Replies: 3

Views: 2K

About photoelectric effect and work function

Jan 30, 2013 · Replies 3 · Jan 30, 2013

Replies: 3

Views: 2K

What is Quantum State? - Understanding the Basics

Jan 26, 2013 · Replies 24 · Jan 30, 2013

Replies: 24

Views: 6K

Wavelength associated with the body - What does it mean?

Jan 29, 2013 · Replies 2 · Jan 30, 2013

Replies: 2

Views: 1K

Why Do Fermions Have +1/2 and -1/2 Spin?

Jan 27, 2013 · Replies 8 · Jan 29, 2013

Replies: 8

Views: 3K

Double Slit Quantum Eraser, Really?

Nov 18, 2012 · Replies 14 · Jan 29, 2013

Replies: 14

Views: 4K

Has Anybody Ever Tried to Build a Build an Brownian Ratchet?

Jan 28, 2013 · Replies 2 · Jan 29, 2013

Replies: 2

Views: 2K

Are there any physical implications of working with unbounded operators in QM?

Jan 28, 2013 · Replies 3 · Jan 29, 2013

Replies: 3

Views: 3K

Trying to Derive Dirac's equation following Dirac

Jan 27, 2013 · Replies 4 · Jan 28, 2013

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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