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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

Sunday, 1:36 AM

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What is the Quantum Domain and Its Role in Levels of Existence?

May 11, 2014 · Replies 4 · May 12, 2014

Replies: 4

Views: 2K

Quantum Teleportation: Confusion on Bell-State Measurement Step

May 5, 2014 · Replies 2 · May 12, 2014

Replies: 2

Views: 2K

S-Matrix definition and terminology

May 10, 2014 · Replies 7 · May 11, 2014

Replies: 7

Views: 2K

Quantum Vacuum and Quantum Foam

May 9, 2014 · Replies 9 · May 11, 2014

Replies: 9

Views: 2K

Quantum interference. Really. Really?

May 10, 2014 · Replies 12 · May 11, 2014

Replies: 12

Views: 2K

Calculating Commutator of Differential Angular Momentum

May 9, 2014 · Replies 5 · May 11, 2014

Replies: 5

Views: 2K

Other Theories of the Quantum Brain

Apr 13, 2014 · Replies 16 · May 11, 2014

Replies: 16

Views: 4K

Stern-Gerlach spin probability

May 9, 2014 · Replies 1 · May 9, 2014

Replies: 1

Views: 3K

Black-body radiation spectral analysis

May 9, 2014 · Replies 2 · May 9, 2014

Replies: 2

Views: 2K

Problem with Gaussian Integral

May 7, 2014 · Replies 6 · May 8, 2014

Replies: 6

Views: 3K

Is the distintion between vector and rays relevant?

May 7, 2014 · Replies 4 · May 8, 2014

Replies: 4

Views: 1K

Quantum mechanics: wave function (momentum space vs real space)

May 6, 2014 · Replies 11 · May 8, 2014

Replies: 11

Views: 8K

What are some potential applications of quantum teleportation?

May 6, 2014 · Replies 8 · May 8, 2014

Replies: 8

Views: 7K

Frequency = mass or does it?

Apr 6, 2014 · Replies 10 · May 8, 2014

Replies: 10

Views: 7K

How Can Higher Order Relativistic Corrections Improve Hydrogen Atom Models?

May 7, 2014 · Replies 4 · May 7, 2014

Replies: 4

Views: 2K

Help with Operators written as components.

May 7, 2014 · Replies 1 · May 7, 2014

Replies: 1

Views: 1K

A new version of quantum theory

May 3, 2014 · Replies 4 · May 7, 2014

Replies: 4

Views: 2K

Photobleaching of fluorophores

May 7, 2014 · Replies 6 · May 7, 2014

Replies: 6

Views: 3K

What Does a Negative or Imaginary Partition Function Indicate?

May 7, 2014 · Replies 4 · May 7, 2014

Replies: 4

Views: 3K

Why this combination and not another

May 6, 2014 · Replies 9 · May 7, 2014

Replies: 9

Views: 1K

Quantum Eraser experiment reproduced at home

May 1, 2014 · Replies 4 · May 6, 2014

Replies: 4

Views: 3K

Electron Correlation in Molecular Systems: Meaning & Types

Oct 5, 2010 · Replies 5 · May 5, 2014

Replies: 5

Views: 10K

The main problem with Hidden Variable Theory

May 1, 2014 · Replies 7 · May 5, 2014

Replies: 7

Views: 2K

Sakurai Degenerate Perturbation Theory: projection operators

May 4, 2014 · Replies 3 · May 5, 2014

Replies: 3

Views: 4K

Does information always conserve?

May 4, 2014 · Replies 2 · May 5, 2014

Replies: 2

Views: 2K

How to quantize a particle confined to the surface of a sphere?

May 4, 2014 · Replies 5 · May 4, 2014

Replies: 5

Views: 3K

Particle annihilation in quantum vacuum

May 3, 2014 · Replies 2 · May 4, 2014

Replies: 2

Views: 2K

A question about interferometry (Zeilinger paper)

May 2, 2014 · Replies 1 · May 4, 2014

Replies: 1

Views: 1K

Would gravity waves exhibit quantum properties?

Apr 29, 2014 · Replies 7 · May 3, 2014

Replies: 7

Views: 2K

Kochen-Specker Proofs Look Wrong to Me

May 3, 2014 · Replies 1 · May 3, 2014

Replies: 1

Views: 1K

Effect of phase change in wave function on energy

May 2, 2014 · Replies 1 · May 2, 2014

Replies: 1

Views: 2K

State vector behaviour during coupling

Apr 27, 2014 · Replies 15 · May 2, 2014

Replies: 15

Views: 2K

Explaining quantized angular momentum?

May 1, 2014 · Replies 8 · May 2, 2014

Replies: 8

Views: 2K

A little magic trick with polarized film

Apr 26, 2014 · Replies 22 · May 1, 2014

Replies: 22

Views: 7K

Srednicki's normalization of path integral

Apr 28, 2014 · Replies 4 · May 1, 2014

Replies: 4

Views: 2K

Superdense coding for sending 2 qubits at a time?

Apr 29, 2014 · Replies 1 · May 1, 2014

Replies: 1

Views: 2K

Understanding Wavefunction Collapse After Measurement

May 1, 2014 · Replies 2 · May 1, 2014

Replies: 2

Views: 2K

Trying to understand particle polarization

Apr 30, 2014 · Replies 5 · May 1, 2014

Replies: 5

Views: 4K

Klein-Gordon Field: Understanding Eq. (1)

Apr 30, 2014 · Replies 4 · Apr 30, 2014

Replies: 4

Views: 2K

Does quantum computer can to send the information faster than light ?

Apr 30, 2014 · Replies 1 · Apr 30, 2014

Replies: 1

Views: 2K

Continuous resolution of identity in a discrete Hilbert-space

Apr 28, 2014 · Replies 5 · Apr 29, 2014

Replies: 5

Views: 2K

Why must a scalar field have a constant vacuum expectation value?

Sep 28, 2012 · Replies 8 · Apr 29, 2014

Replies: 8

Views: 5K

No solution with E=v0 for step potential

Apr 27, 2014 · Replies 2 · Apr 29, 2014

Replies: 2

Views: 2K

Does polarization change upon reflection?

Apr 27, 2014 · Replies 6 · Apr 28, 2014

Replies: 6

Views: 3K

How to get the commutation relation of q and p

Apr 27, 2014 · Replies 5 · Apr 28, 2014

Replies: 5

Views: 3K

Positronium from vacuum fluctuations ?

Apr 22, 2014 · Replies 4 · Apr 28, 2014

Replies: 4

Views: 2K

The normalization constant in wave function and another questions

Apr 27, 2014 · Replies 1 · Apr 27, 2014

Replies: 1

Views: 2K

Pointer Momentum of a Measuring Apparatus

Apr 27, 2014 · Replies 3 · Apr 27, 2014

Replies: 3

Views: 1K

Crude Probability calculation for tunneling

Apr 27, 2014 · Replies 2 · Apr 27, 2014

Replies: 2

Views: 1K

Conserved quantities as symmetry generators

Oct 14, 2013 · Replies 1 · Apr 27, 2014

Replies: 1

Views: 2K

Quantum Entanglement Basic Experiment Question

Apr 26, 2014 · Replies 2 · Apr 27, 2014

Replies: 2

Views: 1K

Expectation value of an operator

Apr 27, 2014 · Replies 1 · Apr 27, 2014

Replies: 1

Views: 2K

Translation operator on a sphere

Apr 26, 2014 · Replies 5 · Apr 27, 2014

Replies: 5

Views: 2K

The central mystery of quantum mechanics (according to Feynman)

Apr 11, 2014 · Replies 30 · Apr 27, 2014

2

Replies: 30

Views: 8K

Weak gravity at quantum level?

Apr 26, 2014 · Replies 4 · Apr 26, 2014

Replies: 4

Views: 2K

Orbitals while transitioning from free electron to ground state

Apr 24, 2014 · Replies 5 · Apr 26, 2014

Replies: 5

Views: 2K

What causes different energy levels in atoms with multiple electrons?

Apr 26, 2014 · Replies 1 · Apr 26, 2014

Replies: 1

Views: 1K

Covariant vs Canonical Formalism

Apr 25, 2014 · Replies 4 · Apr 26, 2014

Replies: 4

Views: 2K

Non Polynomial Hamiltonian Constraint

Apr 25, 2014 · Replies 1 · Apr 26, 2014

Replies: 1

Views: 1K

Quantum Mechanics as Quantum Information

Apr 25, 2014 · Replies 2 · Apr 25, 2014

Replies: 2

Views: 2K

Projective representations of the spin group

Apr 24, 2014 · Replies 4 · Apr 25, 2014

Replies: 4

Views: 2K

Do you know any properties of photons?

Apr 25, 2014 · Replies 1 · Apr 25, 2014

Replies: 1

Views: 1K

Verifying Equality in Scarani's "Six Quantum Pieces

Apr 6, 2014 · Replies 25 · Apr 25, 2014

Replies: 25

Views: 4K

Complementarity with single slit diffraction

Apr 22, 2014 · Replies 5 · Apr 25, 2014

Replies: 5

Views: 2K

Does time reversal symmetry imply hermicity of s-matrix?

Apr 21, 2014 · Replies 5 · Apr 24, 2014

Replies: 5

Views: 3K

Probability theory and quantum mechanics

Apr 19, 2014 · Replies 11 · Apr 23, 2014

Replies: 11

Views: 3K

Angular momentum Operators and Commutation

Apr 21, 2014 · Replies 29 · Apr 23, 2014

Replies: 29

Views: 5K

Physically realisable states and spectra

Apr 20, 2014 · Replies 6 · Apr 23, 2014

Replies: 6

Views: 2K

Does uncertainty of position of particles make substances continuous?

Apr 23, 2014 · Replies 11 · Apr 23, 2014

Replies: 11

Views: 2K

Remind me where to find a proof of a spectral theorem for RHS

Apr 23, 2014 · Replies 4 · Apr 23, 2014

Replies: 4

Views: 2K

If you measure the energy of a system how does wave function collapse

Apr 22, 2014 · Replies 12 · Apr 22, 2014

Replies: 12

Views: 3K

Is There Experimental Proof of Photon Existence Beyond Emission and Absorption?

Apr 17, 2014 · Replies 3 · Apr 22, 2014

Replies: 3

Views: 4K

Why is there little decoherence for photons?

Apr 20, 2014 · Replies 10 · Apr 22, 2014

Replies: 10

Views: 4K

How to compute Von Neumann entropy?

Apr 6, 2014 · Replies 7 · Apr 22, 2014

Replies: 7

Views: 3K

Virtual particles and the Uncertainity Principle

Apr 22, 2014 · Replies 6 · Apr 22, 2014

Replies: 6

Views: 2K

Shape of the magnet in the Stern-Gerlach experiment

Apr 22, 2014 · Replies 1 · Apr 22, 2014

Replies: 1

Views: 2K

Set Up Eigenspace for Particle in 1st State: nx,ny,nz

Apr 19, 2014 · Replies 7 · Apr 22, 2014

Replies: 7

Views: 3K

Understanding Coupled Spin Operators

Apr 21, 2014 · Replies 7 · Apr 22, 2014

Replies: 7

Views: 2K

Net Angular Momentum: Clarifying Confusion

Apr 21, 2014 · Replies 3 · Apr 21, 2014

Replies: 3

Views: 1K

Understanding S-matrix elements in QFT

Apr 19, 2014 · Replies 6 · Apr 21, 2014

Replies: 6

Views: 2K

How Do Matrix Representations Relate to Wave Functions in Quantum Mechanics?

Apr 20, 2014 · Replies 3 · Apr 21, 2014

Replies: 3

Views: 2K

Photon's change of direction of propagation

Apr 20, 2014 · Replies 1 · Apr 21, 2014

Replies: 1

Views: 2K

Is it possible to do quantum mechanics without complex functions

Apr 20, 2014 · Replies 12 · Apr 20, 2014

Replies: 12

Views: 3K

Is there a law which prohibits measuring En of a non-stationary state

Apr 20, 2014 · Replies 6 · Apr 20, 2014

Replies: 6

Views: 1K

In-state: adiabatic switching vs wavepackets

Apr 17, 2014 · Replies 10 · Apr 20, 2014

Replies: 10

Views: 2K

Numerical solution of one dimensional Schrodinger equation

Apr 18, 2014 · Replies 3 · Apr 19, 2014

Replies: 3

Views: 2K

Molecular orbitals sigma and pi

Apr 17, 2014 · Replies 3 · Apr 18, 2014

Replies: 3

Views: 1K

Is Negative Mass Possible in String Theory Through Quantum Fluctuations?

Apr 17, 2014 · Replies 1 · Apr 18, 2014

Replies: 1

Views: 2K

What is the wave equation for the Casimir Effect and how was it derived?

Apr 17, 2014 · Replies 1 · Apr 18, 2014

Replies: 1

Views: 2K

Kinetic Energy of particle in 1D and 3D well

Apr 17, 2014 · Replies 2 · Apr 17, 2014

Replies: 2

Views: 2K

Retro causation in weak measurements?

Apr 8, 2014 · Replies 1 · Apr 16, 2014

Replies: 1

Views: 2K

Questions about quantum fields

Apr 13, 2014 · Replies 5 · Apr 16, 2014

Replies: 5

Views: 2K

A Negation of the Grandfather Paradox

Apr 16, 2014 · Replies 3 · Apr 16, 2014

Replies: 3

Views: 2K

Differential of exponential operator

Apr 16, 2014 · Replies 2 · Apr 16, 2014

Replies: 2

Views: 1K

Can someone explain Compton scattering?

Apr 14, 2014 · Replies 10 · Apr 15, 2014

Replies: 10

Views: 2K

Pauli exclusion principle and position-state restriction

Apr 13, 2014 · Replies 7 · Apr 15, 2014

Replies: 7

Views: 2K

Calculating Matrix Representation of 11><11 for 2 Qubits

Apr 4, 2014 · Replies 5 · Apr 14, 2014

Replies: 5

Views: 2K

Dirac Delta Function: Is delta(x-y) the Same as delta(y-x)?

Apr 13, 2014 · Replies 7 · Apr 14, 2014

Replies: 7

Views: 3K

Necessary axioms to derive solution to QHO problem

Apr 14, 2014 · Replies 2 · Apr 14, 2014

Replies: 2

Views: 1K

Multiple entangled particles and no-communication

Apr 11, 2014 · Replies 4 · Apr 14, 2014

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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