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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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Expanding delta in Field Theory Derivation of Euler-Lagrange Equations

Feb 23, 2014 · Replies 2 · Feb 24, 2014

Replies: 2

Views: 2K

Delayed Choice Eraser with dispersion pattern controlled detectors

Feb 20, 2014 · Replies 2 · Feb 24, 2014

Replies: 2

Views: 1K

Entanglement and interference effects

Feb 24, 2014 · Replies 20 · Feb 24, 2014

Replies: 20

Views: 4K

Joint Number state switching operator?

Feb 23, 2014 · Replies 4 · Feb 24, 2014

Replies: 4

Views: 1K

Uncertainty principle and momentum

Feb 10, 2014 · Replies 66 · Feb 23, 2014

3

Replies: 66

Views: 9K

Finding Hydrogen eigenfunction u(2,0)

Feb 23, 2014 · Replies 4 · Feb 23, 2014

Replies: 4

Views: 1K

Are photons the antiparticle of itself?

Feb 22, 2014 · Replies 11 · Feb 23, 2014

Replies: 11

Views: 3K

To get the complete Radial Wavefunction, why do we multiply by Y(l,m)?

Feb 23, 2014 · Replies 5 · Feb 23, 2014

Replies: 5

Views: 2K

Klein Gordon ret. Greens function on closed form

Feb 23, 2014 · Replies 1 · Feb 23, 2014

Replies: 1

Views: 2K

Peskin and Schroeder derivation of Klein-Gordon propagator

Feb 22, 2014 · Replies 2 · Feb 22, 2014

Replies: 2

Views: 3K

Is the real world mostly collapsed?

Feb 21, 2014 · Replies 7 · Feb 22, 2014

Replies: 7

Views: 2K

Helicity and the Uncertainity Principle

Feb 22, 2014 · Replies 10 · Feb 22, 2014

Replies: 10

Views: 2K

Preferred Basis and Superposition

Feb 10, 2014 · Replies 69 · Feb 22, 2014

3

Replies: 69

Views: 7K

Drawing a Feynman Diagram: Lagrangian Basics

Feb 21, 2014 · Replies 2 · Feb 22, 2014

Replies: 2

Views: 2K

Physical meaning of probability density

Feb 21, 2014 · Replies 3 · Feb 22, 2014

Replies: 3

Views: 2K

Hydrogen atom: potential well and orbit radii

Feb 22, 2014 · Replies 2 · Feb 22, 2014

Replies: 2

Views: 2K

Why does ψ have a ghost number of -1 in BRST symmetry?

Feb 17, 2014 · Replies 9 · Feb 22, 2014

Replies: 9

Views: 2K

Trace of the spin matrix of spin-1

Feb 20, 2014 · Replies 4 · Feb 22, 2014

Replies: 4

Views: 3K

Conceptual Question regarding Uncertainty Principle

Feb 21, 2014 · Replies 1 · Feb 21, 2014

Replies: 1

Views: 2K

Understanding the Separation of Solutions in Partial Differential Equations"

Feb 13, 2014 · Replies 6 · Feb 21, 2014

Replies: 6

Views: 2K

HUP and Rest Mass of Electrons

Feb 21, 2014 · Replies 4 · Feb 21, 2014

Replies: 4

Views: 2K

Could Niels Bohr's Atomic Model Be Simplified by Assuming Stationary Electrons?

Feb 20, 2014 · Replies 14 · Feb 21, 2014

Replies: 14

Views: 3K

Why People Rarely Discuss the Wave Function of Anyons - Explained

Feb 21, 2014 · Replies 2 · Feb 21, 2014

Replies: 2

Views: 1K

Why are Microwaves Better for Quantum Info Stability?

Feb 19, 2014 · Replies 8 · Feb 20, 2014

Replies: 8

Views: 2K

Quantum gates: what is the hardware?

Feb 19, 2014 · Replies 8 · Feb 20, 2014

Replies: 8

Views: 2K

When can the exchange interaction be neglected?

Feb 18, 2014 · Replies 1 · Feb 20, 2014

Replies: 1

Views: 1K

Probability and probability amplitude

Feb 17, 2014 · Replies 5 · Feb 20, 2014

Replies: 5

Views: 2K

Why do we use normalization twice in quantum mechanics?

Feb 19, 2014 · Replies 3 · Feb 19, 2014

Replies: 3

Views: 2K

Easy way to get the expectation value of momentum squared?

Feb 17, 2014 · Replies 1 · Feb 18, 2014

Replies: 1

Views: 2K

Do the quantum effects we observe in visible light occur in all wave

Feb 18, 2014 · Replies 6 · Feb 18, 2014

Replies: 6

Views: 2K

Probability of an entanglement state

Feb 17, 2014 · Replies 2 · Feb 18, 2014

Replies: 2

Views: 1K

Problem on Heisenberg's Uncertainty Principle

Feb 17, 2014 · Replies 14 · Feb 18, 2014

Replies: 14

Views: 2K

Physical observables, locality, and a preferred basis

Apr 25, 2013 · Replies 12 · Feb 17, 2014

Replies: 12

Views: 3K

What Makes Quantum Spin Different from Classical Angular Momentum?

Feb 17, 2014 · Replies 3 · Feb 17, 2014

Replies: 3

Views: 2K

Orthonormality of a complete set of eigenvectors

Jan 22, 2014 · Replies 21 · Feb 17, 2014

Replies: 21

Views: 5K

Does Heisenberg apply to a collapsed wavefunction?

Feb 14, 2014 · Replies 32 · Feb 17, 2014

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Replies: 32

Views: 4K

Electromagnetic waves with regard to photons

Feb 16, 2014 · Replies 15 · Feb 17, 2014

Replies: 15

Views: 3K

Relationship between a field and its quanta

Feb 16, 2014 · Replies 2 · Feb 17, 2014

Replies: 2

Views: 2K

Does decay of particles give evidence of time being real?

Feb 15, 2014 · Replies 9 · Feb 16, 2014

Replies: 9

Views: 2K

Coupling of spin to an electric field

Feb 3, 2014 · Replies 5 · Feb 15, 2014

Replies: 5

Views: 3K

Could a Type-1 and Type-2 Superconductor Oscillator Work?

Feb 15, 2014 · Replies 1 · Feb 15, 2014

Replies: 1

Views: 1K

Excitation to higher energy levels

Feb 13, 2014 · Replies 7 · Feb 14, 2014

Replies: 7

Views: 1K

Unveiling the Mystery: How is the Wavefunction of an Electron Revealed?

Feb 13, 2014 · Replies 5 · Feb 14, 2014

Replies: 5

Views: 2K

Solving the Shroedinger equation for a harmonic oscillator potential

Feb 13, 2014 · Replies 5 · Feb 14, 2014

Replies: 5

Views: 2K

Why transition rate independent of time in perturbation theory?

Feb 12, 2014 · Replies 10 · Feb 13, 2014

Replies: 10

Views: 2K

Dividing line between QM and CM?

Feb 12, 2014 · Replies 20 · Feb 13, 2014

Replies: 20

Views: 3K

Brian Cox and the Pauli Exclusion Principle

Feb 7, 2014 · Replies 82 · Feb 13, 2014

3

Replies: 82

Views: 9K

How is spin measured experimentally ?

Feb 11, 2014 · Replies 3 · Feb 13, 2014

Replies: 3

Views: 2K

How are transistors and QM tied

Feb 11, 2014 · Replies 5 · Feb 12, 2014

Replies: 5

Views: 2K

Calculating Probability Current for Free Particles

Feb 12, 2014 · Replies 1 · Feb 12, 2014

Replies: 1

Views: 1K

Does Dirac Notation Determine Quantum States Uniquely?

Feb 12, 2014 · Replies 1 · Feb 12, 2014

Replies: 1

Views: 1K

Sommerfeld model and fine spectral lines

Feb 10, 2014 · Replies 3 · Feb 12, 2014

Replies: 3

Views: 2K

Spin angular momentum of a spin-1 particle

Feb 10, 2014 · Replies 4 · Feb 11, 2014

Replies: 4

Views: 2K

Entanglement, entropy and photon energy

Feb 9, 2014 · Replies 7 · Feb 11, 2014

Replies: 7

Views: 2K

Can a Wavefunction Change State After Collapse with Disturbance?

Feb 11, 2014 · Replies 1 · Feb 11, 2014

Replies: 1

Views: 2K

Quantum levitation and quantum locking applications

Aug 22, 2012 · Replies 3 · Feb 10, 2014

Replies: 3

Views: 7K

Can Single Photons Bend When They Hit a Material?

Feb 10, 2014 · Replies 2 · Feb 10, 2014

Replies: 2

Views: 4K

A question about Wick theorem?

Feb 10, 2014 · Replies 1 · Feb 10, 2014

Replies: 1

Views: 2K

Do atoms generally exhibit superposition when not isolated?

Feb 6, 2014 · Replies 20 · Feb 9, 2014

Replies: 20

Views: 3K

Degenerate Perturbation Theory

Jan 23, 2014 · Replies 2 · Feb 9, 2014

Replies: 2

Views: 2K

Possible explanation for the wave-particle duality ?

Jan 18, 2014 · Replies 92 · Feb 9, 2014

4

Replies: 92

Views: 13K

How do we know (BΨ) is not equal to zero?

Feb 9, 2014 · Replies 3 · Feb 9, 2014

Replies: 3

Views: 1K

Can someone explain the process of finding c(n) in an infinite well?

Feb 8, 2014 · Replies 3 · Feb 9, 2014

Replies: 3

Views: 2K

No charge polarization on positronium in p-orbital state ?

Feb 8, 2014 · Replies 2 · Feb 9, 2014

Replies: 2

Views: 1K

Does the act of observing/measuring define an arrow of time?

Feb 8, 2014 · Replies 3 · Feb 8, 2014

Replies: 3

Views: 1K

Irreducible graphs and srednicki's book

Feb 7, 2014 · Replies 3 · Feb 8, 2014

Replies: 3

Views: 2K

Can Quantum Suicide and Being in Two Places at Once Coexist?

Feb 7, 2014 · Replies 8 · Feb 8, 2014

Replies: 8

Views: 3K

What are the implications of the Pauli Exclusion Principle across the universe?

Feb 6, 2014 · Replies 12 · Feb 8, 2014

Replies: 12

Views: 3K

What is the magnitude of the relativistic wave-vector?

Feb 8, 2014 · Replies 2 · Feb 8, 2014

Replies: 2

Views: 2K

Is the QED Lagrangian Invariant Under C, P, or T Separately?

Feb 8, 2014 · Replies 1 · Feb 8, 2014

Replies: 1

Views: 1K

Negative variance of an observable quantity

Nov 16, 2013 · Replies 49 · Feb 8, 2014

2

Replies: 49

Views: 9K

How Does EPR Spin Measurement Challenge Quantum Mechanics?

Feb 7, 2014 · Replies 8 · Feb 8, 2014

Replies: 8

Views: 2K

Quantum View of Electron and Photon

Feb 7, 2014 · Replies 3 · Feb 8, 2014

Replies: 3

Views: 2K

Is There a Relationship Between Principal Quantum Number and Amplitude?

Feb 7, 2014 · Replies 4 · Feb 7, 2014

Replies: 4

Views: 2K

Tunneling from Rectangular barrier - Exponential Decay ?

Feb 5, 2014 · Replies 5 · Feb 7, 2014

Replies: 5

Views: 3K

Time-independence of seperable solutions of the Schrödinger eqn

Feb 6, 2014 · Replies 3 · Feb 6, 2014

Replies: 3

Views: 2K

Do single photons disperse like a wave?

Feb 6, 2014 · Replies 15 · Feb 6, 2014

Replies: 15

Views: 3K

Is the product rule on operators different from traditional calculus?

Feb 6, 2014 · Replies 2 · Feb 6, 2014

Replies: 2

Views: 1K

Proton Vibrations: The Behavior of Protons When Not Bound to Nucleus

Feb 5, 2014 · Replies 6 · Feb 5, 2014

Replies: 6

Views: 6K

Ground state: singlet or triplet

Feb 5, 2014 · Replies 2 · Feb 5, 2014

Replies: 2

Views: 2K

Why does the operator S_p - S_n in deuteron result in a zero expectation value?

Feb 5, 2014 · Replies 3 · Feb 5, 2014

Replies: 3

Views: 2K

How Do Individual Photons Behave in the Double Slit Experiment?

Feb 5, 2014 · Replies 3 · Feb 5, 2014

Replies: 3

Views: 2K

Atomic recoil and the polarization of photon emitted

Feb 3, 2014 · Replies 5 · Feb 5, 2014

Replies: 5

Views: 2K

What Are Hermitian Operators and Their Significance in Quantum Mechanics?

Feb 5, 2014 · Replies 5 · Feb 5, 2014

Replies: 5

Views: 2K

Entanglement and separable state

Feb 4, 2014 · Replies 1 · Feb 4, 2014

Replies: 1

Views: 1K

Is the wave function/packet an actual property

Feb 3, 2014 · Replies 7 · Feb 4, 2014

Replies: 7

Views: 2K

Wave function orthogonal components

Feb 3, 2014 · Replies 7 · Feb 4, 2014

Replies: 7

Views: 3K

Double slit with time measurement

Dec 31, 2013 · Replies 67 · Feb 4, 2014

3

Replies: 67

Views: 7K

Why Doesn't Mass of Electrons Increase?

Feb 4, 2014 · Replies 5 · Feb 4, 2014

Replies: 5

Views: 1K

Transition of free to bound electrons

Jan 31, 2014 · Replies 14 · Feb 4, 2014

Replies: 14

Views: 3K

Position variables in the wave function

Feb 3, 2014 · Replies 1 · Feb 3, 2014

Replies: 1

Views: 1K

Quantum Harmonic Oscillator

Feb 3, 2014 · Replies 1 · Feb 3, 2014

Replies: 1

Views: 1K

Why the generator operators of a compact Lie algebra are Hermitian?

Feb 3, 2014 · Replies 9 · Feb 3, 2014

Replies: 9

Views: 5K

Wavefunction Normalization at Different Times

Feb 2, 2014 · Replies 8 · Feb 2, 2014

Replies: 8

Views: 2K

Calculating d<p>/dt: Class Notes & Mistakes

Feb 2, 2014 · Replies 3 · Feb 2, 2014

Replies: 3

Views: 2K

Commutator for fermion operators?

Feb 1, 2014 · Replies 2 · Feb 1, 2014

Replies: 2

Views: 3K

One thing cannot be in two places at the same time

Jan 27, 2014 · Replies 36 · Feb 1, 2014

2

Replies: 36

Views: 10K

Black hole information paradox?

Feb 1, 2014 · Replies 1 · Feb 1, 2014

Replies: 1

Views: 1K

Commutation of time derrivative

Feb 1, 2014 · Replies 3 · Feb 1, 2014

Replies: 3

Views: 2K

Entangled photons and polarisation.

Jan 27, 2014 · Replies 8 · Feb 1, 2014

Replies: 8

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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