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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Undergrad What happens to the eigenvalue if an operator acts on a bra?
- shedrick94
- · Replies 7 ·
Undergrad How to find the spin number of a molecule like water
- TheCanadian
- · Replies 3 ·
High School What counts as observer effect?
- Gaz
- · Replies 24 ·
Undergrad Expanding the Fermi-Dirac integral by Taylor series
- arneet
- · Replies 3 ·
Undergrad What is the spin quantum number of an atom in 4P state?
- shedrick94
- · Replies 7 ·
Undergrad Macroscopic wavefunction evolution
- durant35
- · Replies 9 ·
Graduate Hawking multiverse implications for "all" histories
- trinko
- · Replies 3 ·
Undergrad Quantum Key Distribution - interception confusion
- JaneHall89
- · Replies 1 ·
Undergrad Measuring entangled state of degenerate eigenstates
- maxverywell
- · Replies 4 ·
Undergrad Energy of a number of particles
- EmilyRuck
- · Replies 15 ·
Undergrad How do Z-Dir and N-Dir Spins Affect Entangled State Measurements?
- JaneHall89
- · Replies 7 ·
Undergrad Degeneracy in quantum statistics
- arneet
- · Replies 4 ·
High School What groundbreaking insights can quantum physics research on the ISS reveal?
- 1oldman2
- · Replies 3 ·
Undergrad Singlet and triplet spin states - the normalisation constant
- Sara Kennedy
- · Replies 15 ·
Undergrad What is the meaning of phase in relation to laser states?
- kaje
- · Replies 1 ·
Undergrad Non-Newtonian fluids at the quantum level
- thebosonbreaker
- · Replies 2 ·
Graduate Best first book on quantum mechanics
- almarpa
- · Replies 22 ·
Undergrad Can an electron in an s-orbital exist at the nucleus (r=0)?
- Steven Hanna
- · Replies 2 ·
High School Begining of time, cause and effect and quantum randomness
- tim1608
- · Replies 6 ·
High School What does bosonization mean for electronics and quantum computers?
- wolram
- · Replies 1 ·
High School What is stopping potential and what does the formula e × Vs mean?
- Gajan1234
- · Replies 5 ·
Undergrad Examples of Basic Potential functions
- DaTario
- · Replies 3 ·
Undergrad How Does Quantum Mechanics Relate to Quantum Field Theory in Particle Physics?
- fxdung
- · Replies 267 ·
Undergrad Simulation Hypothesis and Skynet
- Curiousphy
- · Replies 2 ·
High School Number of entangled particles in nature
- entropy1
- · Replies 16 ·
Undergrad Schrodinger equation and stationary states
- amjad-sh
- · Replies 12 ·
Graduate Canonical quantization of scalar fields
- Higgsy
- · Replies 3 ·
High School Can entanglement be broken easily
- KarminValso1724
- · Replies 1 ·
Undergrad Derivation of the photon energy
- shaiyefet
- · Replies 4 ·
High School What is Quantum Statistical Mechanics?
- fxdung
- · Replies 33 ·
Undergrad Why are the gamma-matrices invariant?
- PatrickUrania
- · Replies 71 ·
High School So the holographic principle doesn't have much evidence?
- Chrisjohnson
- · Replies 20 ·
Undergrad Why is there only odd eigenfunctions for a 1/2 harmonic oscillator
- thegirl
- · Replies 2 ·
High School Interference patterns of electrons vs. photons
- entropy1
- · Replies 4 ·
High School Electrons and ions -- how long can they exist apart?
- Gajan1234
- · Replies 2 ·
Undergrad Why can't macroscopic objects maintain quantum coherence like superconductors?
- durant35
- · Replies 10 ·
High School Does quantum mechanics explain why subatomic particles behave the way they do?
- KarminValso1724
- · Replies 3 ·
High School Why do the 4 forces have the strength that they do?
- KarminValso1724
- · Replies 3 ·
Undergrad Why must the graviton be spin-2 and how does it differ from other bosons?
- bbbl67
- · Replies 31 ·
Undergrad Why electron enters the lowest potential possible?
- Tahmeed
- · Replies 1 ·
Undergrad Sign convention in X-axis rotation Hamiltonian and unitary
- Strilanc
- · Replies 3 ·
Graduate Can the Markov chain be used in qubit manipulation?
- Cristina Maria
- · Replies 2 ·
Undergrad Energy quantization of the particle in a box
- bodyscripter
- · Replies 3 ·
Graduate Optical Bistability and the Jaynes-Cummings Model
- Raptor112
- · Replies 11 ·
Undergrad A special relativity explanation for the Lorentz Force?
- tim9000
- · Replies 10 ·
Graduate Liouville Master Equation for an Open Quantum System
- Raptor112
- · Replies 10 ·
Undergrad Probability density and kinetic
- Incand
- · Replies 3 ·
Undergrad Does the probability collapse theory of QM imply backward in time
- fredt17
- · Replies 12 ·
Undergrad When do excited states need multiple Slater determinants?
- HAYAO
- · Replies 13 ·
High School How Do Virtual Photons Mediate Forces in Quantum Electrodynamics?
- KarminValso1724
- · Replies 1 ·
Undergrad Why can spin-x eigenstates be written as superpositions of spin-z eigenstates?
- Sara Kennedy
- · Replies 4 ·
Undergrad Can interactions happen at less than the Planck Time?
- bbbl67
- · Replies 3 ·
Undergrad Normalizing Constant 3D Infinite Well
- RaulTheUCSCSlug
- · Replies 5 ·
Undergrad Virtual particles in Feynman diagrams and not
- friend
- · Replies 11 ·
Undergrad Expression for Uncertainty of Arbitrary Operator
- DrPapper
- · Replies 3 ·
Undergrad Why is there a -1/2 in the Lagrangian density for ω mesons?
- izzi wekwek
- · Replies 2 ·
High School Do probabilities for entangled polarization states add up to one?
- klw289
- · Replies 4 ·
Undergrad Postulates for the formal core of quantum mechanics
- A. Neumaier
- · Replies 8 ·
Graduate Fermi energy Ef changes with applied electric field?
- Dimani4
- · Replies 5 ·
Graduate What is a "quantum potential" ?
- momo666
- · Replies 4 ·
Undergrad Wave-particle duality and localization
- amjad-sh
- · Replies 8 ·
High School Faster than light communication via entanglement?
- Chrisjohnson
- · Replies 19 ·
Undergrad Difference between expectation value and eigenvalue
- Sara Kennedy
- · Replies 5 ·
Undergrad What are the deep theoretical reasons for electron spin?
- BiGyElLoWhAt
- · Replies 19 ·
High School The sticky elactic in the Bloch sphere
- naima
- · Replies 1 ·
Undergrad What Is the Descriptive Meaning of \(- \frac{e}{c}\vec A\)?
- Anton Alice
- · Replies 3 ·
Undergrad How do total spin and magnetic quantum numbers combine for two identical 1/2 particles?
- Sara Kennedy
- · Replies 5 ·
Graduate Quantum Optics Question and Wigner Functions
- Raptor112
- · Replies 1 ·
Graduate Is Phase Relevant for Uncharged Particles?
- LarryS
- · Replies 1 ·
Undergrad Deciphering equations from Dirac's YouTube lecture videos
- kq6up
- · Replies 2 ·
Undergrad Why do bosons have integer spin and fermions have half-integer spin?
- bbbl67
- · Replies 5 ·
Undergrad How to prove Schrodinger's equation in momentum space?
- Joker93
- · Replies 8 ·
High School Do Photons Contribute to the Energy Released in Nuclear Explosions?
- thetexan
- · Replies 2 ·
Graduate Euclidean signature and compact gauge group
- Einj
- · Replies 5 ·
Undergrad General Solution of Dirac Delta Potential Well
- rbwang1225
- · Replies 4 ·
High School Does Photon Emission Cause Decoherence?
- Feeble Wonk
- · Replies 43 ·
Undergrad Why is reflection coefficient |B|²/|A|² for scattering from delta function potential?
- Danny Boy
- · Replies 20 ·
High School What takes up the empty space of an atom?
- Chrisjohnson
- · Replies 11 ·
Graduate Time correlation of an observable in the Schrödinger picture
- kith
- · Replies 6 ·
Graduate Why use adiabatic evolution instead of cooling?
- mupsi
- · Replies 6 ·
High School When are particles in a quantum state?
- Fiziqs
- · Replies 20 ·
Graduate What's meant by D dimensional gas?
- erbilsilik
- · Replies 1 ·
Undergrad Do entangled particles exist in superposition?
- friend
- · Replies 14 ·
Graduate Steane Code, Distance 3-Stabilizer-Codes
- mupsi
- · Replies 8 ·
Undergrad How Do Photons Behave When They Intersect?
- Passionate Eng
- · Replies 1 ·
Undergrad Teleportation isn't exclusively quantum....?
- DirkMan
- · Replies 2 ·
Undergrad The barrier length in quantum tunneling
- Alan Ezra
- · Replies 5 ·
Graduate Water molecule first hyperpolarizability
- Konte
- · Replies 3 ·
Graduate Dispersive Regime in Jaynes-Cummings Model
- Raptor112
- · Replies 2 ·
Undergrad Thermal radiation and light pump
- Matej Kurtulik
- · Replies 2 ·
Undergrad Software Designs Quantum Experiments
- Hornbein
- · Replies 3 ·
Undergrad How can I write a normalized spin superposition in a simplified form?
- Ananthan9470
- · Replies 2 ·
Undergrad Weinberg Lectures on QM (2013 ed.), Equation 6.5.5
- jouvelot
- · Replies 2 ·
Graduate What is the relationship between the Casimir force and the strong nuclear force?
- nebulacollector
- · Replies 10 ·
High School Is Solving Schrodinger's Equation the Best Way to Approach Quantum Mechanics?
- houlahound
- · Replies 17 ·
Undergrad Transmission coefficient limit
- TheCanadian
- · Replies 1 ·
Undergrad What are magnetic and electric fields?
- John_RB
- · Replies 7 ·
Undergrad Can an Electron Absorb a Photon if the Next Energy Level is Full?
- magicman54494
- · Replies 1 ·
Undergrad Quantum field and mediating particles
- alivedude
- · Replies 2 ·
Graduate Tracks in particle detectors and quantum paths
- TrickyDicky
- · Replies 127 ·