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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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QED: Electric Field - Can We Observe Photons?

Feb 7, 2011 · Replies 2 · Feb 7, 2011

Replies: 2

Views: 3K

Quantum cloning and disentanglement

Feb 7, 2011 · Replies 2 · Feb 7, 2011

Replies: 2

Views: 2K

Original Schrodinger Equation Article in English

Jan 8, 2011 · Replies 16 · Feb 7, 2011

Replies: 16

Views: 6K

Real Hydrogen Atom: Exploring Electron Energy Effects

Feb 7, 2011 · Replies 5 · Feb 7, 2011

Replies: 5

Views: 3K

Pure state versus superposition

Feb 7, 2011 · Replies 5 · Feb 7, 2011

Replies: 5

Views: 2K

Difference Between Weyl & Majorana Spinnors

Feb 5, 2011 · Replies 7 · Feb 7, 2011

Replies: 7

Views: 4K

Why is free field called free ?

Jan 26, 2011 · Replies 54 · Feb 7, 2011

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Replies: 54

Views: 8K

What is the Mistake in Deriving the EM Hamiltonian?

Feb 6, 2011 · Replies 2 · Feb 7, 2011

Replies: 2

Views: 2K

Entangled Photon Repeater = FTL Communication?

Feb 4, 2011 · Replies 3 · Feb 6, 2011

Replies: 3

Views: 4K

How many quantum numbers would the system have overall?

Feb 6, 2011 · Replies 1 · Feb 6, 2011

Replies: 1

Views: 1K

Insight, spontaneous ordering?

Feb 3, 2011 · Replies 2 · Feb 6, 2011

Replies: 2

Views: 2K

Time-Independent Schrödinger Equation

Feb 6, 2011 · Replies 2 · Feb 6, 2011

Replies: 2

Views: 2K

Different masses of particles and anti-particles

Feb 5, 2011 · Replies 11 · Feb 6, 2011

Replies: 11

Views: 4K

Hydrogen atom with discrete nonlinear Schrödinger equation

Feb 4, 2011 · Replies 8 · Feb 6, 2011

Replies: 8

Views: 3K

Casimir effect: threshhold distance?

Feb 6, 2011 · Replies 2 · Feb 6, 2011

Replies: 2

Views: 1K

About the n-point Green functions in position-space

Feb 3, 2011 · Replies 8 · Feb 6, 2011

Replies: 8

Views: 3K

Wave-packets with opposite momenta.

Feb 5, 2011 · Replies 5 · Feb 6, 2011

Replies: 5

Views: 1K

What Are the Assumptions Behind the Groenewold-van Hove Theorem?

Feb 4, 2011 · Replies 15 · Feb 6, 2011

Replies: 15

Views: 8K

How do we know the value of spin?

Feb 5, 2011 · Replies 10 · Feb 5, 2011

Replies: 10

Views: 3K

How to understand braket two state?

Feb 24, 2010 · Replies 14 · Feb 5, 2011

Replies: 14

Views: 4K

Quantum Computing problem [Quantum Teleportation] (Nelson and Chuang)

Jun 2, 2007 · Replies 3 · Feb 5, 2011

Replies: 3

Views: 6K

Differentiating the complex scalar field

Jan 26, 2011 · Replies 60 · Feb 5, 2011

3

Replies: 60

Views: 14K

Nondegenerate Eignefunctions as Linear Combinations

Feb 4, 2011 · Replies 3 · Feb 4, 2011

Replies: 3

Views: 3K

How Can You Calculate Landau Level Orbitals and Wavefunctions?

Feb 4, 2011 · Replies 1 · Feb 4, 2011

Replies: 1

Views: 2K

An Introduction to Hilbert Space: Physically Explained

Feb 4, 2011 · Replies 18 · Feb 4, 2011

Replies: 18

Views: 4K

How Are Slits Made for the Double Slit Experiment?

Jan 2, 2011 · Replies 41 · Feb 4, 2011

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Replies: 41

Views: 10K

Why is there a time dilation in relativity and what are its implications?

Jan 30, 2011 · Replies 17 · Feb 4, 2011

Replies: 17

Views: 4K

Full knowledge of polarisation angle.

Feb 3, 2011 · Replies 5 · Feb 4, 2011

Replies: 5

Views: 3K

Unable to decrypt emission/absorption matrix element

Feb 4, 2011 · Replies 1 · Feb 4, 2011

Replies: 1

Views: 2K

Quantum entanglement between fermions

Feb 2, 2011 · Replies 13 · Feb 4, 2011

Replies: 13

Views: 4K

QM: Is this a Spherical Harmonic Identity?

Feb 4, 2011 · Replies 3 · Feb 4, 2011

Replies: 3

Views: 2K

Understanding the 5 DiVincenzo Criteria for a Scalable Quantum Computer

Dec 15, 2007 · Replies 4 · Feb 4, 2011

Replies: 4

Views: 8K

Feynman rules for Majorana fields (based on Srednicki)

Jan 26, 2011 · Replies 15 · Feb 4, 2011

Replies: 15

Views: 4K

Understanding Electron Orbitals: The Role of Photons in Orbital Changes

Feb 3, 2011 · Replies 4 · Feb 4, 2011

Replies: 4

Views: 2K

Solving Schrodinger's Eqn for Quantum Ring: Boundary Conditions?

Jan 27, 2011 · Replies 5 · Feb 3, 2011

Replies: 5

Views: 2K

Is There a Boson for Magnetic Force in Quantum Mechanics?

Feb 2, 2011 · Replies 7 · Feb 3, 2011

Replies: 7

Views: 6K

Stern-Gerlach With 3 Magnets

Feb 2, 2011 · Replies 7 · Feb 3, 2011

Replies: 7

Views: 4K

Interference of different lights

Feb 3, 2011 · Replies 4 · Feb 3, 2011

Replies: 4

Views: 3K

Quantum Electrodynamics in Curved Spacetime

Feb 3, 2011 · Replies 5 · Feb 3, 2011

Replies: 5

Views: 5K

Wick rotation and interference

Jan 31, 2011 · Replies 9 · Feb 3, 2011

Replies: 9

Views: 3K

Single photon wave like propagation

Feb 2, 2011 · Replies 6 · Feb 3, 2011

Replies: 6

Views: 4K

Some questions about perturbative expansion of S matrix

Feb 3, 2011 · Replies 1 · Feb 3, 2011

Replies: 1

Views: 2K

Interactions between virtual and real particles

Jan 31, 2011 · Replies 11 · Feb 3, 2011

Replies: 11

Views: 3K

Why Does Equivalence Principle Imply Non-Existence of Higher Spin Fields?

Feb 2, 2011 · Replies 5 · Feb 3, 2011

Replies: 5

Views: 3K

Quantum Mechanics e-2, Bransden & Joachain

Feb 2, 2011 · Replies 1 · Feb 3, 2011

Replies: 1

Views: 6K

How do the wave-functions of particles and anti-particles differ?

Jan 31, 2011 · Replies 21 · Feb 2, 2011

Replies: 21

Views: 6K

What happens in this thought experiment?

Feb 1, 2011 · Replies 3 · Feb 2, 2011

Replies: 3

Views: 2K

Velocity of qm particle in a box

Feb 1, 2011 · Replies 2 · Feb 2, 2011

Replies: 2

Views: 4K

Speed of photons through dual slit.

Feb 1, 2011 · Replies 2 · Feb 1, 2011

Replies: 2

Views: 2K

The velocity of electrons (question)

Jan 31, 2011 · Replies 2 · Feb 1, 2011

Replies: 2

Views: 2K

General Relativity, Quantum Mechanics, Motion and Virtual Particles Oh my

Jan 31, 2011 · Replies 5 · Feb 1, 2011

Replies: 5

Views: 3K

Unknown well-known equation in Sakurai

Jan 31, 2011 · Replies 19 · Feb 1, 2011

Replies: 19

Views: 5K

Bra-ket Notation: Explained in Layman's Terms + How to Notate

Jan 30, 2011 · Replies 20 · Feb 1, 2011

Replies: 20

Views: 8K

Quantum Decoherence: Understanding Contradictions

Jan 24, 2011 · Replies 36 · Feb 1, 2011

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Replies: 36

Views: 7K

How Do Helium Lamps Produce Light?

Jan 31, 2011 · Replies 1 · Feb 1, 2011

Replies: 1

Views: 5K

How can I deform electron orbitals?

Jan 29, 2011 · Replies 6 · Feb 1, 2011

Replies: 6

Views: 3K

What is the Doppler Shift of Matter?

May 15, 2008 · Replies 3 · Feb 1, 2011

Replies: 3

Views: 3K

How Does the Schrödinger Equation Account for Rest Mass Energy?

Jan 31, 2011 · Replies 2 · Jan 31, 2011

Replies: 2

Views: 2K

Entangled particles - Correlations

Jan 22, 2011 · Replies 12 · Jan 31, 2011

Replies: 12

Views: 4K

Why Must Dirac Matrices in Minkowski Space Be at Least 4x4?

Jan 31, 2011 · Replies 8 · Jan 31, 2011

Replies: 8

Views: 6K

Hamiltonian mechanics and the electric field

Dec 31, 2010 · Replies 15 · Jan 31, 2011

Replies: 15

Views: 4K

Time travel and the double slit experiment?

Jan 30, 2011 · Replies 1 · Jan 30, 2011

Replies: 1

Views: 4K

Difference between coherent light and polarized light

Jan 30, 2011 · Replies 2 · Jan 30, 2011

Replies: 2

Views: 13K

Casimir Effect? Seems there is a simpler solution than virtual-particles.

Jan 30, 2011 · Replies 2 · Jan 30, 2011

Replies: 2

Views: 2K

Where can I find Dirac's original papers?

Jan 29, 2011 · Replies 2 · Jan 30, 2011

Replies: 2

Views: 8K

A confusion from David tong's notes on QFT

Jan 29, 2011 · Replies 3 · Jan 30, 2011

Replies: 3

Views: 4K

Question about double slit experiment

Jan 28, 2011 · Replies 3 · Jan 30, 2011

Replies: 3

Views: 3K

QED Renormalization: Feynman Diagrams with Counterterms on External Legs

Jan 29, 2011 · Replies 7 · Jan 30, 2011

Replies: 7

Views: 4K

Neutron Dipole Moment: Parity, Time Reversal Symmetry

Jan 30, 2011 · Replies 1 · Jan 30, 2011

Replies: 1

Views: 2K

Uncertainty Principle: My Solid State Physics Class

Sep 8, 2009 · Replies 8 · Jan 30, 2011

Replies: 8

Views: 6K

What separates one particle from another?

Jan 29, 2011 · Replies 6 · Jan 30, 2011

Replies: 6

Views: 2K

Shankar's treatment of Dirac's delta-function

Jan 25, 2011 · Replies 9 · Jan 29, 2011

Replies: 9

Views: 4K

Bare Charges of Identical Particles: Is It Possible?

Jan 29, 2011 · Replies 2 · Jan 29, 2011

Replies: 2

Views: 3K

QED:WeakForce:QCDU(1):SU(2):SU(3)T^1:T^2:T^3 ?

Jan 27, 2011 · Replies 1 · Jan 29, 2011

Replies: 1

Views: 2K

What Wave Patterns Emerge from Randomized Buoy Generators on a Calm Lake?

Jan 29, 2011 · Replies 2 · Jan 29, 2011

Replies: 2

Views: 2K

Wave function (orbital) rotation matrix

Jan 29, 2011 · Replies 1 · Jan 29, 2011

Replies: 1

Views: 3K

Quantum double slit experiment

Oct 16, 2010 · Replies 51 · Jan 29, 2011

2

Replies: 51

Views: 11K

Which way detector (hardware) information

Jan 28, 2011 · Replies 5 · Jan 29, 2011

Replies: 5

Views: 3K

Quantum vacuum, virtual particles and ''friction''

Jan 26, 2011 · Replies 3 · Jan 29, 2011

Replies: 3

Views: 3K

Empty space can set objects in motion

Feb 5, 2004 · Replies 24 · Jan 28, 2011

Replies: 24

Views: 5K

Rainbows and wave-particle duality

Jan 27, 2011 · Replies 9 · Jan 28, 2011

Replies: 9

Views: 4K

Is the wave-function frequency of subatomic particles affected by gravity?

Jan 27, 2011 · Replies 5 · Jan 28, 2011

Replies: 5

Views: 4K

Some confusions about interaction picture, in peskin

Jan 24, 2011 · Replies 16 · Jan 28, 2011

Replies: 16

Views: 5K

Relativistic quantum mechanics and causality

Sep 21, 2007 · Replies 52 · Jan 28, 2011

2

Replies: 52

Views: 16K

Double slit experiment question

Jan 27, 2011 · Replies 1 · Jan 27, 2011

Replies: 1

Views: 2K

Photoelectric effect experiment

Dec 3, 2010 · Replies 3 · Jan 27, 2011

Replies: 3

Views: 2K

The projetive Hilbert space of coherent state.

Jan 26, 2011 · Replies 2 · Jan 27, 2011

Replies: 2

Views: 2K

How are free fields and static fields in QFT interconnected?

Jan 27, 2011 · Replies 4 · Jan 27, 2011

Replies: 4

Views: 2K

Schrodingers Cat is sbserved whilst in the box

Jan 27, 2011 · Replies 3 · Jan 27, 2011

Replies: 3

Views: 3K

Consecutive Measurements on One of an Entangled Pair

Jan 27, 2011 · Replies 2 · Jan 27, 2011

Replies: 2

Views: 2K

New Type of Entanglement - Time

Jan 23, 2011 · Replies 16 · Jan 27, 2011

Replies: 16

Views: 4K

Electrons traversing a Potential well

Jan 27, 2011 · Replies 2 · Jan 27, 2011

Replies: 2

Views: 2K

Should QM or QED be used?

Jan 24, 2011 · Replies 18 · Jan 27, 2011

Replies: 18

Views: 4K

Understanding Convergence Factors in Physics Textbooks

Jan 21, 2011 · Replies 5 · Jan 27, 2011

Replies: 5

Views: 2K

Understanding Cutkosky's Rules for Bhabha Scattering and the Optical Theorem

Jan 26, 2011 · Replies 1 · Jan 27, 2011

Replies: 1

Views: 4K

What Happens When Photon Strikes an Electron?

Jan 23, 2011 · Replies 3 · Jan 26, 2011

Replies: 3

Views: 2K

What is the value, in joules, of one quantum of energy?

Jan 20, 2011 · Replies 5 · Jan 26, 2011

Replies: 5

Views: 9K

Why is the behaviour at infinity important in classifying gauge theory states?

Jan 26, 2011 · Replies 2 · Jan 26, 2011

Replies: 2

Views: 2K

Special Relativity and Entanglement

Jan 19, 2011 · Replies 52 · Jan 26, 2011

2

Replies: 52

Views: 8K

Help with intuition concering braket sandwich

Jan 26, 2011 · Replies 1 · Jan 26, 2011

Replies: 1

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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