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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

Graduate Understanding Barandes' microscopic theory of causality

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Graduate Wave function of particles approching 0 K

May 23, 2014 · Replies 11 · May 26, 2014

Replies: 11

Views: 2K

Graduate Dual Tensors in Lagrangian: Why are they not included in U(1) theory?

May 26, 2014 · Replies 6 · May 26, 2014

Replies: 6

Views: 2K

Graduate Fundamental forces and Pauli's exclusion principle

May 20, 2014 · Replies 4 · May 26, 2014

Replies: 4

Views: 2K

Graduate Understanding the Electron Wave Function

May 24, 2014 · Replies 3 · May 26, 2014

Replies: 3

Views: 2K

Graduate Is Zeno's Paradox Relevant in Understanding Digital and Real-World Motion?

Jan 21, 2014 · Replies 7 · May 26, 2014

Replies: 7

Views: 2K

Graduate Complete set of eigenfunctions

May 25, 2014 · Replies 6 · May 25, 2014

Replies: 6

Views: 5K

Graduate How can the electron density expression be simplified using momenta?

May 18, 2014 · Replies 10 · May 25, 2014

Replies: 10

Views: 2K

Graduate Wave function collapse in QED?

May 20, 2014 · Replies 44 · May 25, 2014

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Replies: 44

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Graduate Unitary operator acting on state

May 24, 2014 · Replies 2 · May 24, 2014

Replies: 2

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Undergrad Quantum theory and electronic engineering

May 23, 2014 · Replies 5 · May 24, 2014

Replies: 5

Views: 2K

Graduate Proof that the linear momentum operator is hermitian

May 23, 2014 · Replies 5 · May 24, 2014

Replies: 5

Views: 12K

Graduate Mega quick question: must the Lagrangian (density) be real valued?

May 23, 2014 · Replies 5 · May 23, 2014

Replies: 5

Views: 2K

Graduate Experiment: Photon propagating trough dense neutrino beam

May 23, 2014 · Replies 4 · May 23, 2014

Replies: 4

Views: 1K

Graduate Use of ancillary bits in quantum computing

May 21, 2014 · Replies 2 · May 23, 2014

Replies: 2

Views: 3K

Graduate Are All Electrons Entangled with Each Other?

May 22, 2014 · Replies 2 · May 23, 2014

Replies: 2

Views: 2K

Graduate How are wavefunctions and eigenkets used differently in quantum mechanics?

May 10, 2014 · Replies 30 · May 22, 2014

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Replies: 30

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Graduate Ehrenfest Theorem in Quantum Mechanics: Bohr-Sommerfield's Theory

May 21, 2014 · Replies 7 · May 22, 2014

Replies: 7

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Graduate The dot or cross product of two operators acting on a state

May 21, 2014 · Replies 3 · May 22, 2014

Replies: 3

Views: 4K

Graduate Linearisation of Lie Group Higher dimensional groups

May 18, 2014 · Replies 21 · May 21, 2014

Replies: 21

Views: 3K

Graduate Can Our Consciousness Exist in Multiple Parallel Universes Simultaneously?

May 21, 2014 · Replies 1 · May 21, 2014

Replies: 1

Views: 3K

Graduate What is the impact of discontinuous potentials on quantum harmonic oscillators?

May 11, 2014 · Replies 6 · May 21, 2014

Replies: 6

Views: 2K

Graduate Imaginary free energy and decay rate

May 13, 2014 · Replies 1 · May 21, 2014

Replies: 1

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Graduate Why Are Physicists Struggling to Quantize Gravity in Quantum Field Theory?

May 20, 2014 · Replies 2 · May 20, 2014

Replies: 2

Views: 2K

Graduate What Makes J = L + S Confusing in Quantum Mechanics?

May 18, 2014 · Replies 11 · May 20, 2014

Replies: 11

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Graduate Complex conjugate of a wavefunction

May 20, 2014 · Replies 6 · May 20, 2014

Replies: 6

Views: 15K

Graduate Double slit experiment with magnets

May 19, 2014 · Replies 3 · May 20, 2014

Replies: 3

Views: 2K

Graduate Stern Gerlach Experiment and Spin

May 13, 2014 · Replies 25 · May 19, 2014

Replies: 25

Views: 4K

Graduate Understanding tensor operators

May 18, 2014 · Replies 3 · May 19, 2014

Replies: 3

Views: 2K

Graduate Expectation values of unbounded operator

May 19, 2014 · Replies 2 · May 19, 2014

Replies: 2

Views: 1K

Graduate Expectation Value of Gaussian Wave Function: Position & Momentum Zero?

May 19, 2014 · Replies 2 · May 19, 2014

Replies: 2

Views: 6K

Graduate Arranging 3 Identical Electrons

Mar 9, 2014 · Replies 6 · May 19, 2014

Replies: 6

Views: 2K

Graduate Why can we choose wavefunctions to be real?

May 18, 2014 · Replies 2 · May 19, 2014

Replies: 2

Views: 2K

Graduate A few basic questions about quantum information

May 17, 2014 · Replies 1 · May 17, 2014

Replies: 1

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Graduate Is it Possible to Spin an Atom without Breaking it Apart?

May 17, 2014 · Replies 1 · May 17, 2014

Replies: 1

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Graduate Understanding Entropy and Gravity in Quantum Field Theory: A Beginner's Guide

May 17, 2014 · Replies 4 · May 17, 2014

Replies: 4

Views: 2K

Graduate How can you relate standing wave to a corpuscle at rest?

May 16, 2014 · Replies 6 · May 17, 2014

Replies: 6

Views: 2K

Graduate How can I derive the Dirac equation from Lagrangian?

May 17, 2014 · Replies 1 · May 17, 2014

Replies: 1

Views: 1K

Graduate What is the concept of gauge symmetry in physics?

May 15, 2014 · Replies 15 · May 16, 2014

Replies: 15

Views: 3K

Graduate Energy, frequency, and Planck's constant

May 14, 2014 · Replies 23 · May 16, 2014

Replies: 23

Views: 10K

Graduate Can Schrödinger's Cat's State Be Measured Through Gravity?

May 16, 2014 · Replies 4 · May 16, 2014

Replies: 4

Views: 2K

Graduate Is discreteness supplied or demanded?

May 15, 2014 · Replies 4 · May 16, 2014

Replies: 4

Views: 1K

Graduate Bound state negative potentials into harmonic oscillator basis

May 15, 2014 · Replies 2 · May 16, 2014

Replies: 2

Views: 2K

Undergrad Looking for some help with constructing a double slit experiment

May 13, 2014 · Replies 5 · May 15, 2014

Replies: 5

Views: 2K

Graduate About self-measurement in entangled system

May 2, 2014 · Replies 24 · May 15, 2014

Replies: 24

Views: 3K

Graduate Going back to basics: The Normal Force

May 13, 2014 · Replies 9 · May 14, 2014

Replies: 9

Views: 2K

Graduate Baker–Campbell–Hausdorff (CBH) Formula question

May 14, 2014 · Replies 2 · May 14, 2014

Replies: 2

Views: 3K

Graduate Homemade Quantum Eraser Experiment revisited with photos and full text

May 6, 2014 · Replies 13 · May 14, 2014

Replies: 13

Views: 8K

Undergrad Double Slit Experiment Questions

May 13, 2014 · Replies 4 · May 14, 2014

Replies: 4

Views: 3K

Graduate Questions about tensor operator

May 14, 2014 · Replies 1 · May 14, 2014

Replies: 1

Views: 1K

Graduate Energy of electron + positron separated by distance

May 11, 2014 · Replies 12 · May 13, 2014

Replies: 12

Views: 3K

Graduate Spherical harmonics of Hydrogen-like atoms

May 11, 2014 · Replies 4 · May 13, 2014

Replies: 4

Views: 2K

Graduate Why can magnetic quantum no. only take values between -l and +l?

May 10, 2014 · Replies 19 · May 13, 2014

Replies: 19

Views: 2K

Graduate Roksar-Kivelson Hamiltonian for a Quantum Dimer Gas

May 12, 2014 · Replies 1 · May 12, 2014

Replies: 1

Views: 1K

Undergrad WaveLengths of Light Waves and their respective photons

May 8, 2014 · Replies 9 · May 12, 2014

Replies: 9

Views: 2K

Graduate Photon interaction with atoms in transparent medias

May 12, 2014 · Replies 7 · May 12, 2014

Replies: 7

Views: 2K

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

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

Replies: 4

Views: 2K

Graduate Quantum Teleportation: Confusion on Bell-State Measurement Step

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

Replies: 2

Views: 2K

Graduate S-Matrix definition and terminology

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

Replies: 7

Views: 2K

Graduate Quantum Vacuum and Quantum Foam

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

Replies: 9

Views: 2K

Graduate Quantum interference. Really. Really?

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

Replies: 12

Views: 2K

Graduate Calculating Commutator of Differential Angular Momentum

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

Replies: 5

Views: 2K

Graduate Other Theories of the Quantum Brain

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

Replies: 16

Views: 4K

Graduate Stern-Gerlach spin probability

May 9, 2014 · Replies 1 · May 9, 2014

Replies: 1

Views: 3K

Graduate Black-body radiation spectral analysis

May 9, 2014 · Replies 2 · May 9, 2014

Replies: 2

Views: 2K

Graduate Problem with Gaussian Integral

May 7, 2014 · Replies 6 · May 8, 2014

Replies: 6

Views: 3K

Graduate Is the distintion between vector and rays relevant?

May 7, 2014 · Replies 4 · May 8, 2014

Replies: 4

Views: 2K

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

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

Replies: 11

Views: 8K

Graduate What are some potential applications of quantum teleportation?

May 6, 2014 · Replies 8 · May 8, 2014

Replies: 8

Views: 7K

Graduate Frequency = mass or does it?

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

Replies: 10

Views: 7K

Graduate How Can Higher Order Relativistic Corrections Improve Hydrogen Atom Models?

May 7, 2014 · Replies 4 · May 7, 2014

Replies: 4

Views: 2K

Graduate Alternative definition of constants

May 7, 2014 · Replies 6 · May 7, 2014

Replies: 6

Views: 1K

Graduate Help with Operators written as components.

May 7, 2014 · Replies 1 · May 7, 2014

Replies: 1

Views: 1K

Graduate A new version of quantum theory

May 3, 2014 · Replies 4 · May 7, 2014

Replies: 4

Views: 2K

Graduate Photobleaching of fluorophores

May 7, 2014 · Replies 6 · May 7, 2014

Replies: 6

Views: 3K

Graduate What Does a Negative or Imaginary Partition Function Indicate?

May 7, 2014 · Replies 4 · May 7, 2014

Replies: 4

Views: 3K

Graduate Why this combination and not another

May 6, 2014 · Replies 9 · May 7, 2014

Replies: 9

Views: 1K

Graduate Quantum Eraser experiment reproduced at home

May 1, 2014 · Replies 4 · May 6, 2014

Replies: 4

Views: 3K

Graduate Electron Correlation in Molecular Systems: Meaning & Types

Oct 5, 2010 · Replies 5 · May 5, 2014

Replies: 5

Views: 11K

Graduate The main problem with Hidden Variable Theory

May 1, 2014 · Replies 7 · May 5, 2014

Replies: 7

Views: 2K

Graduate Sakurai Degenerate Perturbation Theory: projection operators

May 4, 2014 · Replies 3 · May 5, 2014

Replies: 3

Views: 4K

Graduate Does information always conserve?

May 4, 2014 · Replies 2 · May 5, 2014

Replies: 2

Views: 2K

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

May 4, 2014 · Replies 5 · May 4, 2014

Replies: 5

Views: 3K

Graduate Particle annihilation in quantum vacuum

May 3, 2014 · Replies 2 · May 4, 2014

Replies: 2

Views: 2K

Graduate A question about interferometry (Zeilinger paper)

May 2, 2014 · Replies 1 · May 4, 2014

Replies: 1

Views: 1K

Graduate Would gravity waves exhibit quantum properties?

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

Replies: 7

Views: 2K

Graduate Kochen-Specker Proofs Look Wrong to Me

May 3, 2014 · Replies 1 · May 3, 2014

Replies: 1

Views: 1K

Graduate Effect of phase change in wave function on energy

May 2, 2014 · Replies 1 · May 2, 2014

Replies: 1

Views: 2K

Graduate State vector behaviour during coupling

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

Replies: 15

Views: 2K

Graduate Explaining quantized angular momentum?

May 1, 2014 · Replies 8 · May 2, 2014

Replies: 8

Views: 2K

Undergrad A little magic trick with polarized film

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

Replies: 22

Views: 7K

Graduate Srednicki's normalization of path integral

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

Replies: 4

Views: 2K

Graduate Superdense coding for sending 2 qubits at a time?

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

Replies: 1

Views: 2K

Graduate Understanding Wavefunction Collapse After Measurement

May 1, 2014 · Replies 2 · May 1, 2014

Replies: 2

Views: 2K

Graduate Trying to understand particle polarization

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

Replies: 5

Views: 5K

Graduate Klein-Gordon Field: Understanding Eq. (1)

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

Replies: 4

Views: 2K

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

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

Replies: 1

Views: 2K

Graduate Continuous resolution of identity in a discrete Hilbert-space

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

Replies: 5

Views: 2K

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

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

Replies: 8

Views: 5K

Graduate No solution with E=v0 for step potential

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

Replies: 2

Views: 2K

Undergrad Does polarization change upon reflection?

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

Replies: 6

Views: 3K

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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