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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

Undergrad On computing quantum waves exactly from classical action

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Graduate Where do all the interfered photons go?

Mar 19, 2011 · Replies 35 · Mar 23, 2011

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Replies: 35

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Graduate 2 particles in a 1-dimensional box

Mar 23, 2011 · Replies 1 · Mar 23, 2011

Replies: 1

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Graduate Could anyone derive an assertion found in light and matter, a strange theory ?

Mar 21, 2011 · Replies 4 · Mar 22, 2011

Replies: 4

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Graduate QED functions E(a to b) and P(a to b)

Mar 11, 2011 · Replies 10 · Mar 22, 2011

Replies: 10

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Graduate In the reality how I perform the many kind of measurements, like operators p,q,E

Mar 22, 2011 · Replies 1 · Mar 22, 2011

Replies: 1

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Graduate Nonlinear optics: electric dipole moment operator

Mar 15, 2011 · Replies 6 · Mar 22, 2011

Replies: 6

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Graduate Explanation why dosen't the electron fall into the nucleus?

Dec 18, 2005 · Replies 74 · Mar 22, 2011

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Replies: 74

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Undergrad Photoelectric Effect and energy

Mar 21, 2011 · Replies 6 · Mar 21, 2011

Replies: 6

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Graduate Visibility of a specific waveleangth

Mar 21, 2011 · Replies 1 · Mar 21, 2011

Replies: 1

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Undergrad Classical and quantum physics.

Mar 18, 2011 · Replies 7 · Mar 21, 2011

Replies: 7

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Graduate What is going on with the indices

Mar 20, 2011 · Replies 2 · Mar 21, 2011

Replies: 2

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Graduate Understanding the quadratic Stark effect

Mar 20, 2011 · Replies 6 · Mar 21, 2011

Replies: 6

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Graduate Grassman number in functional quantization?

Mar 21, 2011 · Replies 1 · Mar 21, 2011

Replies: 1

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Graduate Energy-Time uncertainty: observer's clock or observed's?

Mar 20, 2011 · Replies 1 · Mar 21, 2011

Replies: 1

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Undergrad Would a Wave Plate Affect Interference in Young's Experiment?

Mar 20, 2011 · Replies 1 · Mar 20, 2011

Replies: 1

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Graduate Raman Wavefunction: Rayleigh & Raman Scattering Implications

Mar 20, 2011 · Replies 1 · Mar 20, 2011

Replies: 1

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Graduate Gravity: An Emergent Phenomenon According to Theoretical Physicist Erik Verlinde

Mar 20, 2011 · Replies 1 · Mar 20, 2011

Replies: 1

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Graduate Which of the following particles would have the shortest wavelength?

Mar 18, 2011 · Replies 3 · Mar 20, 2011

Replies: 3

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Graduate Causes Virtual Particles or Vacuum Energy or Other?

Mar 20, 2011 · Replies 1 · Mar 20, 2011

Replies: 1

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Graduate Is Discretized Space the Key to Understanding Quantum Decoherence?

Mar 20, 2011 · Replies 1 · Mar 20, 2011

Replies: 1

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Graduate Vacuum Energy and the Casmir Plate and Electromagnetics

Mar 19, 2011 · Replies 2 · Mar 19, 2011

Replies: 2

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Graduate What Does One Non-Trivial Irreducible Representation of Clifford Algebra Mean?

Mar 19, 2011 · Replies 2 · Mar 19, 2011

Replies: 2

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Graduate Trace Theorems and Dirac Matrices

Mar 19, 2011 · Replies 2 · Mar 19, 2011

Replies: 2

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Graduate The possibility of a Casimir Effect Battery

Mar 10, 2011 · Replies 12 · Mar 19, 2011

Replies: 12

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Graduate Non-hermiticity of fourth power of momentum operator in L=0 state of hydrigen atom

Mar 17, 2011 · Replies 3 · Mar 19, 2011

Replies: 3

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Graduate Is There a Superluminal Signal When Turning Off a Harmonic Potential?

Mar 18, 2011 · Replies 6 · Mar 19, 2011

Replies: 6

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Graduate Solving Confusing Indices in Operator Calculus

Mar 18, 2011 · Replies 2 · Mar 19, 2011

Replies: 2

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Graduate Quantum physics, reality, consciousness and the hypnagogic/hypnopompic state

Mar 18, 2011 · Replies 1 · Mar 18, 2011

Replies: 1

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High School Are electrons and protons equal in attraction?

Mar 17, 2011 · Replies 16 · Mar 18, 2011

Replies: 16

Views: 3K

Graduate Atom and Sublevels: Quantum Physics Questions Answered

Mar 18, 2011 · Replies 2 · Mar 18, 2011

Replies: 2

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Graduate What is the mathematical basis of quantum mechanics?

Mar 17, 2011 · Replies 18 · Mar 18, 2011

Replies: 18

Views: 4K

Graduate How to know if two photons are entangled?

Mar 18, 2011 · Replies 2 · Mar 18, 2011

Replies: 2

Views: 6K

Graduate Physicsal meaning of Expectation of two variables

Mar 18, 2011 · Replies 1 · Mar 18, 2011

Replies: 1

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Graduate Proof Scalar action is conformally invariant

Mar 16, 2011 · Replies 6 · Mar 18, 2011

Replies: 6

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Graduate What is the unidimensional case of a finite barrier inside a finite well?

Mar 16, 2011 · Replies 1 · Mar 18, 2011

Replies: 1

Views: 2K

Graduate Is the substitution of the numerator in QFT scattering amplitudes always valid?

Mar 17, 2011 · Replies 2 · Mar 18, 2011

Replies: 2

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Graduate How can I take the inner product between a position eigenstate and a ket?

Mar 16, 2011 · Replies 1 · Mar 17, 2011

Replies: 1

Views: 1K

Graduate Time evolution in quantum field theories

Feb 26, 2011 · Replies 79 · Mar 17, 2011

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Replies: 79

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Graduate When matter and anti-matter collide, in what form is the resulting energy?

Mar 16, 2011 · Replies 4 · Mar 17, 2011

Replies: 4

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Graduate Is this Operator a Projection Operator? A Proof

Mar 17, 2011 · Replies 1 · Mar 17, 2011

Replies: 1

Views: 3K

Graduate Solving the Mystery of Guided Particles in a Black Hole

Feb 28, 2011 · Replies 61 · Mar 17, 2011

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Replies: 61

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Graduate How to measure which slit a photon went through

Mar 17, 2011 · Replies 2 · Mar 17, 2011

Replies: 2

Views: 3K

Graduate Why are there several gauge fixing choice for gauge symmetry fields?

Mar 14, 2011 · Replies 3 · Mar 17, 2011

Replies: 3

Views: 4K

Graduate How Does Measurement Angle Affect Quantum Entanglement Probabilities?

Mar 15, 2011 · Replies 2 · Mar 17, 2011

Replies: 2

Views: 3K

Graduate Square Brackets in Partial Derivatives: Meaning & Examples

Mar 16, 2011 · Replies 3 · Mar 16, 2011

Replies: 3

Views: 2K

Graduate Regularization by differentiation respect to a parameter

Mar 16, 2011 · Replies 1 · Mar 16, 2011

Replies: 1

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Graduate Photon Antibunching: Clarifying Inverse Not Necessarily True

Mar 16, 2011 · Replies 2 · Mar 16, 2011

Replies: 2

Views: 3K

Graduate Interpreting Correlation Functions: (1) vs (2)

Mar 16, 2011 · Replies 1 · Mar 16, 2011

Replies: 1

Views: 3K

Graduate How Do Neutral Atoms Emit Black-Body Radiation?

Mar 14, 2011 · Replies 1 · Mar 16, 2011

Replies: 1

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Graduate Thought experiment: Observation via Recording

Mar 15, 2011 · Replies 5 · Mar 15, 2011

Replies: 5

Views: 2K

Graduate Electron Self-Energy: QED Calculation & Verification

Mar 15, 2011 · Replies 2 · Mar 15, 2011

Replies: 2

Views: 4K

Graduate Is Reality as We Know It Just an Illusion?

Mar 11, 2011 · Replies 9 · Mar 15, 2011

Replies: 9

Views: 3K

Graduate Differential equations in Quantum Mechanics

Mar 15, 2011 · Replies 3 · Mar 15, 2011

Replies: 3

Views: 5K

Graduate The probability functional description of a wave

Mar 10, 2011 · Replies 9 · Mar 15, 2011

Replies: 9

Views: 3K

Graduate Canonical transformation in Hamiltonian

Mar 13, 2011 · Replies 8 · Mar 15, 2011

Replies: 8

Views: 3K

Graduate Double Slit Experiment: The Observer's Eye Affecting Matter

Mar 14, 2011 · Replies 2 · Mar 15, 2011

Replies: 2

Views: 2K

Graduate Are clicks proof of single photons?

Feb 20, 2011 · Replies 155 · Mar 15, 2011

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Replies: 155

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Graduate Thinking about the uncertainty principle.

Mar 13, 2011 · Replies 5 · Mar 14, 2011

Replies: 5

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Graduate Why is plasma frequency in ev and not hz

Mar 14, 2011 · Replies 3 · Mar 14, 2011

Replies: 3

Views: 9K

Graduate Can Particles Be Connected Across Vast Distances?

Mar 13, 2011 · Replies 4 · Mar 14, 2011

Replies: 4

Views: 3K

Undergrad How Does the Star Trek Warp Core Utilize Matter-Antimatter Collisions?

May 23, 2004 · Replies 9 · Mar 14, 2011

Replies: 9

Views: 4K

Graduate Using the drude equation to find the dielectric function

Mar 14, 2011 · Replies 1 · Mar 14, 2011

Replies: 1

Views: 3K

Graduate Definition of indistinct in pauli exclusion principle

Mar 12, 2011 · Replies 5 · Mar 14, 2011

Replies: 5

Views: 2K

Graduate Pauli exclusion principle, quantum states, and lasers?

Mar 11, 2011 · Replies 8 · Mar 14, 2011

Replies: 8

Views: 5K

Graduate Symmetry, Lagrangian, Qm, and diff eqs.

Mar 10, 2011 · Replies 8 · Mar 14, 2011

Replies: 8

Views: 2K

Graduate Do higher spin particles obey Klein-Gordon or Dirac equations?

Mar 12, 2011 · Replies 14 · Mar 13, 2011

Replies: 14

Views: 6K

Graduate Solution to uncertainty principle

Mar 11, 2011 · Replies 9 · Mar 13, 2011

Replies: 9

Views: 3K

Graduate Are All Two-Particle Wave Functions Products of One-Particle Wave Functions?

Mar 12, 2011 · Replies 10 · Mar 13, 2011

Replies: 10

Views: 6K

Graduate Quantum/Computational Chemistry

Mar 12, 2011 · Replies 4 · Mar 13, 2011

Replies: 4

Views: 4K

Undergrad Is the Conservation of Energy ever violated?

Aug 16, 2008 · Replies 14 · Mar 13, 2011

Replies: 14

Views: 6K

Undergrad Where Do Photons Go After They Are Created?

Mar 13, 2011 · Replies 3 · Mar 13, 2011

Replies: 3

Views: 2K

Graduate Newbie problem about <a|b> and |a> <b|

Mar 11, 2011 · Replies 4 · Mar 13, 2011

Replies: 4

Views: 2K

Graduate Are Mixed States Classical? | Niles

Mar 13, 2011 · Replies 1 · Mar 13, 2011

Replies: 1

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Graduate Can Blackbody Radiation Explain Heat Absorption in Hollow Cavities?

Mar 10, 2011 · Replies 19 · Mar 13, 2011

Replies: 19

Views: 6K

Graduate Perception of Time & the Probability Wave: Is It Illusory?

Mar 12, 2011 · Replies 1 · Mar 12, 2011

Replies: 1

Views: 2K

High School Smallest Distance: How We Feel Things Without Touching

Mar 10, 2011 · Replies 14 · Mar 12, 2011

Replies: 14

Views: 5K

Graduate Real or Virtual Particles: Chicken or the Egg?

Feb 22, 2011 · Replies 69 · Mar 12, 2011

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Replies: 69

Views: 14K

Graduate Overlap integrals and eigenstates problem

Mar 11, 2011 · Replies 2 · Mar 12, 2011

Replies: 2

Views: 4K

Undergrad Can a sinlge photon be polarised?

Mar 10, 2011 · Replies 11 · Mar 12, 2011

Replies: 11

Views: 3K

Graduate Direct products in quantum mechanics

Mar 11, 2011 · Replies 1 · Mar 11, 2011

Replies: 1

Views: 5K

Graduate G-factor Relation to Energy Perturbations

Mar 8, 2011 · Replies 3 · Mar 11, 2011

Replies: 3

Views: 3K

Graduate Green's Functions & Density of States

Mar 7, 2011 · Replies 6 · Mar 11, 2011

Replies: 6

Views: 3K

Graduate Why discontinue(quantum)characteristic ultimately relates with probability in QM?

Mar 10, 2011 · Replies 7 · Mar 11, 2011

Replies: 7

Views: 2K

Graduate Is all electromagnetic radiation quantized?

Mar 9, 2011 · Replies 25 · Mar 11, 2011

Replies: 25

Views: 9K

Graduate Positronium, Hydrogen, Schrodinger Equation

Feb 26, 2011 · Replies 18 · Mar 11, 2011

Replies: 18

Views: 8K

Graduate Is There an Alternative to Anti-Commutation for Quantizing Fermions?

Mar 10, 2011 · Replies 2 · Mar 11, 2011

Replies: 2

Views: 2K

Graduate Linear Equations & Quantum Mechanics

Mar 10, 2011 · Replies 4 · Mar 10, 2011

Replies: 4

Views: 2K

Graduate What stage are we at in Quantum Mechanics?

Mar 10, 2011 · Replies 10 · Mar 10, 2011

Replies: 10

Views: 2K

Graduate How are entangled particles captured and contained?

Mar 8, 2011 · Replies 6 · Mar 10, 2011

Replies: 6

Views: 3K

Graduate Exploring Hot Research in Theoretical Quantum Optics/Cavity QED

Mar 9, 2011 · Replies 2 · Mar 10, 2011

Replies: 2

Views: 2K

Graduate Energy Transferred to Electrons: What Happens When It's Not Enough?

Mar 9, 2011 · Replies 3 · Mar 10, 2011

Replies: 3

Views: 2K

Graduate Are there degrees of quantum entanglement?

Mar 7, 2011 · Replies 4 · Mar 10, 2011

Replies: 4

Views: 4K

Graduate Boundedness of quantum observables?

Feb 1, 2011 · Replies 174 · Mar 10, 2011

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Replies: 174

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Graduate Stern Gerlach Experiment, bra(c)kets etc

Mar 9, 2011 · Replies 2 · Mar 10, 2011

Replies: 2

Views: 2K

Graduate How is a quantum computer simulated?

Mar 9, 2011 · Replies 1 · Mar 9, 2011

Replies: 1

Views: 2K

An awesome video on the double slit experiment

Mar 9, 2011 · Replies 7 · Mar 9, 2011

Replies: 7

Views: 3K

Graduate How many periods of a photon are involved in proton energy level transistion?

Mar 8, 2011 · Replies 3 · Mar 9, 2011

Replies: 3

Views: 3K

Graduate Validate Bohr Radius: Challenges Creating Metallic Hydrogen

Mar 6, 2011 · Replies 10 · Mar 9, 2011

Replies: 10

Views: 5K

High School What is the Concept of a Potential Well?

Mar 8, 2011 · Replies 1 · Mar 8, 2011

Replies: 1

Views: 2K

Graduate Why is subatomic behavior quantized instead of continuous?

Mar 7, 2011 · Replies 12 · Mar 8, 2011

Replies: 12

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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