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.
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High School Entanglement when I "produce" positron-electron pairs one at a time
- metastable
- · Replies 46 ·
Undergrad Confusion with Dirac notation in the eigenvalue problem
- peguerosdc
- · Replies 5 ·
Graduate Rabi frequency and "optical resonance and two level atoms" by Allen
- Paintjunkie
- · Replies 7 ·
Undergrad Planck had 2 definitions of energy in 1900, how?
- Cool4Kat
- · Replies 1 ·
High School How do you find the Lagrangians for different fields?
- Wrichik Basu
- · Replies 1 ·
Undergrad One vertex interactions in QED - error in the book?
- Wrichik Basu
- · Replies 4 ·
High School Understanding Quantum: The Particle/Number Duality
- Quotidian
- · Replies 8 ·
High School Do photons have a position operator and how is speed defined for them?
- bahamagreen
- · Replies 2 ·
High School Quantum theory for high-school students
- Demystifier
- · Replies 77 ·
Graduate Uncertainty vs Randomness in Quantum Physics
- Sasho Andonov
- · Replies 16 ·
Undergrad A bar magnet and magnetic moment in a magnetic field
- hokhani
- · Replies 8 ·
Undergrad Quantum Mechanics, The Delta-Function potential
- eliUCV
- · Replies 8 ·
High School Fourier decomposition notation in QFT: 4-vector or 3-vector in exponents?
- Wrichik Basu
- · Replies 5 ·
Undergrad Is the holographic principle based on fuzzy logic?
- Suekdccia
- · Replies 3 ·
Undergrad Operations regarding tensor-product states
- WWCY
- · Replies 2 ·
Undergrad Numerical solution to the Schrodinger eqn. using Finite Difference Method
- patrykh18
- · Replies 1 ·
Graduate Time convolution master equation in Mohseni vs Breuer
- Ark236
- · Replies 1 ·
Graduate Golden ratio fractal phase conjugation
- Mieleko
- · Replies 4 ·
Undergrad Hund's rules and Pauli's principle
- Reignbeaux
- · Replies 6 ·
Undergrad How can laser detuning excite an atom?
- annaphys
- · Replies 5 ·
Graduate Why do we know that an elementary particle is a point particle?
- fxdung
- · Replies 30 ·
Undergrad Particle in free space - what happens to the wave function after measurement?
- QuasarBoy543298
- · Replies 2 ·
Graduate What are the units of the radial wavefunction in my FORTRAN code?
- peanutbutter
- · Replies 1 ·
Graduate Time Evolution of a Square Pulse - Fourier
- skynelson
- · Replies 1 ·
Undergrad Is Schrödinger's kittens thought experiment a genuine advance?
- ftr
- · Replies 31 ·
Undergrad Quantum Jumps and Schrodinger's Cat are predictable
- Tom.G
- · Replies 79 ·
High School Photon exchange in molecular bonds
- Ocata
- · Replies 2 ·
Undergrad Is a particle really in superposition or just unknown?
- thermia
- · Replies 10 ·
Graduate Is the wavefunction subjective? How?
- fluidistic
- · Replies 128 ·
Undergrad Can Brain Responses to Quantum Signals Determine True Quantum Interpretation?
- john taylor
- · Replies 2 ·
Undergrad Do spin operators 'appear' to commute for an entangled spin state?
- muonion
- · Replies 4 ·
Undergrad Is there a procedure for designing some quantum circuits?
- Haorong Wu
- · Replies 2 ·
Undergrad Uncertainty Principle in the context of tracking particle paths
- WWCY
- · Replies 12 ·
Undergrad Communicating Via Quantum Entanglement Using Time Differentiated Pulse
- ray3400
- · Replies 24 ·
Graduate Can the Huygens-Fresnel principle be translated into path integrals?
- jordi
- · Replies 14 ·
Undergrad The Philosophy of Quantum Mechanics
- A. Neumaier
- · Replies 23 ·
Undergrad Role of mass and quantum gravitational effects in friction?
- IonReactor
- · Replies 4 ·
Graduate Observables when the symmetry is not broken?
- mbond
- · Replies 4 ·
Undergrad Is the Basis in Quantum Physics a Fundamental Property of Objects?
- jlcd
- · Replies 15 ·
Undergrad Why Would Observation Change Anything Physically?
- ray3400
- · Replies 24 ·
Undergrad Why does a detector before the slits change the pattern in the double-slit experiment?
- ray3400
- · Replies 36 ·
Insights Vacuum Fluctuations in Experimental Practice - Comments
- A. Neumaier
- · Replies 41 ·
Graduate On the Planck Blackbody Function
- Charles Link
- · Replies 16 ·
Undergrad Classicality and the Correspondence Principle
- jlcd
- · Replies 63 ·
Undergrad Value of beta in Boltzmann Statistics taking degeneracy into account
- JohnnyGui
- · Replies 19 ·
Undergrad How to know where the up and down spin go in the wavefunction?
- QuarkDecay
- · Replies 1 ·
Graduate What is the significance of nonlocality super-activation in this paper?
- DarMM
- · Replies 1 ·
Undergrad Does this hint of entanglement within protons suggest new physics?
- member 656954
- · Replies 2 ·
Undergrad The information paradox and non-locality, ER = EPR
- Dennis Plews
- · Replies 6 ·
Graduate What it is the internal space?
- seletynof
- · Replies 1 ·
Graduate Someone observing Wigner and his friend
- A. Neumaier
- · Replies 20 ·
High School Phase shift in Mach-Zehnder interferometer
- Sonderval
- · Replies 5 ·
Undergrad Clebsch-Gordan coefficients for coupling three spin-1/2 particles
- JoJoQuinoa
- · Replies 3 ·
Undergrad Explanation of spin degrees of freedom with respect to the x axis
- Somali_Physicist
- · Replies 9 ·
Undergrad Attractive force of opposite charges by McIrvin
- exponent137
- · Replies 1 ·
Undergrad D'Alembertian in Sakurai's Advanced QM book
- Wrichik Basu
- · Replies 10 ·
Graduate Why is the metric tensor the unique choice for reducing tensor integrals?
- gjj
- · Replies 4 ·
High School Loss of information and Quantum Determinism
- Simple man
- · Replies 26 ·
Undergrad According to quantum physics, can our universe be a simulation?
- Philipsmett
- · Replies 3 ·
Graduate Experimental evidence of non-local quantum forces
- Auto-Didact
- · Replies 3 ·
Undergrad Entangle Distant Particles: Theoretical Possibility?
- Curious marq
- · Replies 1 ·
Graduate Does the effective action make sense in Quantum Mechanics?
- jordi
- · Replies 5 ·
High School Why does blue light mean hot but blue objects aren't hotter?
- revv
- · Replies 8 ·
Graduate Deriving the midpoint in Weyl ordering for path integral propagators
- TeethWhitener
- · Replies 14 ·
High School Are photons the wave sources of Huygens-Fresnel principle?
- DoobleD
- · Replies 8 ·
Insights The Classical Limit of Quantum Mechanical Commutator
- samalkhaiat
- · Replies 8 ·
Undergrad About the Feynman Path Integral and Principle of Least Time
- EsbMtrx
- · Replies 1 ·
Graduate Influence of strong measurements in a Two Slit Interferometer
- Marilyn67
- · Replies 8 ·
High School Double Slit Wave Interference With Single Electrons
- metastable
- · Replies 1 ·
High School Was Bell's hypothesis verified?
- jk22
- · Replies 2 ·
Undergrad Why does the orthogonal m=0 state carry s=0 in spin addition?
- Sparky_
- · Replies 14 ·
Undergrad Viewing light at four trillion frames per second
- zincshow
- · Replies 3 ·
Graduate Is the Klein-Gordon equation a quantization of classical particles?
- jordi
- · Replies 45 ·
Undergrad Why does ρ(θ)dθ = ρ(x)dx for probability densities?
- Kaguro
- · Replies 6 ·
High School Measuring a circle and the Uncertainty principle
- brianhurren
- · Replies 4 ·
Undergrad Confusions about some symbols in QC
- Haorong Wu
- · Replies 4 ·
Undergrad Relational Hidden Variables (Real ensemble or thermal?)
- jlcd
- · Replies 26 ·
Undergrad Instantly reformable wave packets instead of "particles"?
- Idunno
- · Replies 17 ·
High School "Slowly varying" potential for WKB approximation
- Wrichik Basu
- · Replies 1 ·
High School Heisenberg's uncertainty principle - does it always apply?
- DannyTr
- · Replies 14 ·
Undergrad Pauli spin matrices under inversion and 180 degree rotation?
- zmth
- · Replies 5 ·
Undergrad Solving the Quantum Mechanics of a Hydrogen Atom
- frustrationboltzmann
- · Replies 3 ·
Undergrad Electron wave funtion harmonic oscillator
- jhonnyS
- · Replies 2 ·
Undergrad What Is the Correct Order for Multi-System Bra Vectors in Quantum Mechanics?
- Talisman
- · Replies 15 ·
Undergrad Projection Operators: Pi, Pj, δij in Quantum Mechanics
- RohanJ
- · Replies 3 ·
Undergrad How are apparently 'continuous' blackbody spectra formed?
- argon1120
- · Replies 4 ·
Undergrad Fine Structure Spectra: Understanding Electron Intrinsic Spin Effects
- zengodspeed1
- · Replies 2 ·
Graduate Are there conditions for the vanishing of geometrical phases in QM?
- andresB
- · Replies 1 ·
Graduate Dipole moment operator and perterbations
- Paintjunkie
- · Replies 3 ·
Undergrad Why does a photon have parity -1
- Gene Naden
- · Replies 7 ·
Undergrad What is the failure of superposition in quantum mechanics?
- Hawkingo
- · Replies 8 ·
Undergrad Are electromagnetic waves sine waves?
- Jeff Root
- · Replies 3 ·
Graduate Crossing degeneracies and geometrical phases
- andresB
- · Replies 1 ·
High School Potassium or other minerals and the photoelectic effect
- pager48
- · Replies 3 ·
Undergrad Applying an observable operator on the current state
- QuasarBoy543298
- · Replies 3 ·
Graduate Suppose there is an extra compact dimension, and suppose
- Spinnor
- · Replies 2 ·
Graduate How to prove this property of the Dual Strength Field Tensor?
- Gaussian97
- · Replies 2 ·
Graduate What does "solving a quantum mechanics problem" mean?
- jordi
- · Replies 3 ·
Graduate Infinite Photons: How Can an Infinitesimal Time Range Create an Infinity?
- JPC
- · Replies 1 ·
Undergrad Pauli matrices and shared eigenvectors
- Sunny Singh
- · Replies 3 ·