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 States of equal energy are equally probable
- msumm21
- · Replies 29 ·
Undergrad Diffraction of Matter: Examining Bohr's Theory
- Mustafa Bayram
- · Replies 6 ·
High School Is there a fractional frequency of light?
- Mustafa Bayram
- · Replies 9 ·
Undergrad Limit of quantum mechanics as h -> 0
- offscene
- · Replies 6 ·
Graduate Schrodinger equation in quantum field theory
- accdd
- · Replies 8 ·
Undergrad Derivation of two-electron density operator
- Mart1234
- · Replies 3 ·
Undergrad Integration of Bessel function products (J_1(x)^2/xdx)
- euphoricrhino
- · Replies 1 ·
Undergrad Angular momentum and rotations
- Kashmir
- · Replies 4 ·
High School Electrons at Absolute Zero -- do they still move?
- Vectronix
- · Replies 11 ·
Graduate Found a new formula of Dirac calculus
- Demystifier
- · Replies 7 ·
Graduate Eigenvalue Problem of Quantum Mechanics
- CuriousLearner8
- · Replies 6 ·
Undergrad The clarity of Heisenberg uncertainty
- Narasoma
- · Replies 18 ·
Undergrad Approach to extrapolate a "superpositioned" wave?
- ironhak
- · Replies 27 ·
Graduate What is meant when a phase is said to have "symmetry protected"?
- physics2023
- · Replies 6 ·
Undergrad Unruh, Haag et al.: No Room for Particles in Quantum Field Theory?
- lindberg
- · Replies 12 ·
Undergrad How to define expectation value in relativistic quantum mechanics?
- Foracle
- · Replies 2 ·
Undergrad Why is quantum mechanics not valid for large objects?
- John Mcrain
- · Replies 15 ·
Undergrad Observer effect in the Dual Slit experiment
- John Mcrain
- · Replies 6 ·
Undergrad How does EM wave geometrical attenuation affect atomic absorption?
- Leureka
- · Replies 3 ·
Graduate The eigenvalue power method for quantum problems
- hilbert2
- · Replies 2 ·
High School Quantum Connection vs Entanglement: What's the Difference?
- louislaolu
- · Replies 11 ·
High School What is the difference between a wave and a field?
- Kenneth Boon Faker
- · Replies 13 ·
Undergrad The electron as a smeared charge density
- physwiz222
- · Replies 13 ·
Undergrad Symbol meaning in CP-violating angle
- Ranku
- · Replies 1 ·
Undergrad Do atoms recoil when emitting a photon?
- sol47739
- · Replies 38 ·
Undergrad How certain is the uncertainty principle?
- dsaun777
- · Replies 10 ·
Graduate Solving the Radial Equation for the Dirac Hydrogen Atom Solution
- topsquark
- · Replies 10 ·
Undergrad Is Brownian motion a purely classical phenomenon or is it also quantm?
- Aidyan
- · Replies 2 ·
High School Spin And Angular Momentum of Large Objects
- Hornbein
- · Replies 2 ·
Undergrad Two hydrogen atoms and Pauli's exclusion principle
- josemi_guelll
- · Replies 17 ·
Undergrad Understanding tensor product and direct sum
- dwd40physics
- · Replies 11 ·
Graduate Can four electrons form a completely antisymmetric joint spin WF？
- edpmodel
- · Replies 16 ·
Graduate Heavy Quark Propagators in HQET
- Elmo
- · Replies 1 ·
Graduate Scalar decay to one-loop in Yukawa interaction
- Gaussian97
- · Replies 4 ·
Undergrad Does there exist momentum-shift operator?
- PRB147
- · Replies 3 ·
Undergrad Finite Well Problem: Can Energy Be Equal to V0?
- Coelum
- · Replies 12 ·
High School Delayed choice experiment and FTL communication
- cala
- · Replies 15 ·
Undergrad Construction of an Entangled Photon Source
- Marilyn67
- · Replies 18 ·
Graduate Ballentine on the "multicomponent state function"
- EE18
- · Replies 1 ·
Graduate Ballentine on Diffraction Scattering
- EE18
- · Replies 4 ·
Undergrad A very basic question about bra-kets
- olgerm
- · Replies 10 ·
Undergrad Parameter Integration of Bubble Integral
- Elmo
- · Replies 2 ·
Undergrad Velocity operator, its expression and eigenvalues
- Kashmir
- · Replies 27 ·
Graduate Understanding time translations in Ballentine
- EE18
- · Replies 2 ·
Undergrad How can multiple entangled Qubits be represented and visualized?
- pervect
- · Replies 2 ·
Undergrad QFT vs GR Cosmological Constant
- dsaun777
- · Replies 15 ·
Undergrad What are the units of the squeezing parameter?
- Sciencemaster
- · Replies 8 ·
Undergrad (extended) Page-Wootters formalism
- Heidi
- · Replies 14 ·
Graduate Decoherence in the Heisenberg Picture
- LittleSchwinger
- · Replies 1 ·
High School What is a photon's structure composed of?
- lighthouse1234
- · Replies 6 ·
High School Is the photon a gauge boson for neutrinos?
- MichPod
- · Replies 20 ·
High School Does DCQE show a shift between the two "which path" results?
- Rene Dekker
- · Replies 9 ·
Graduate Heisenberg picture and Path integrals (Zee QFT)
- qft-El
- · Replies 15 ·
High School Are electrons in atoms always in eigenstates?
- snoopies622
- · Replies 6 ·
Undergrad Experiment with gamers, random numbers and entanglement
- Spathi
- · Replies 5 ·
Undergrad Why is the minimum energy equal to the energy uncertainty?
- asdf
- · Replies 3 ·
Undergrad Use of an Essentially Ubiquitous Equation
- topsquark
- · Replies 2 ·
High School The energy of a molecule has what sign?
- Lotto
- · Replies 3 ·
Undergrad What is an observable exactly?
- dsaun777
- · Replies 3 ·
Undergrad Global evolution of a Bell pair of photons
- Heidi
- · Replies 6 ·
Undergrad Uncertainty Principle in QFT & Early Universe Conditions
- victorvmotti
- · Replies 1 ·
Undergrad Intuition for why linear algebra is needed in quantum physics
- Shirish
- · Replies 7 ·
Undergrad Laser and hair - scattering or destructive interference?
- Spathi
- · Replies 4 ·
Undergrad Are the proton and electron quantum entangled in the hydrogen atom?
- Stevexyz
- · Replies 4 ·
Graduate Can anyone give me the details of creating a cat state in Circuit QED?
- physicsclaus
- · Replies 16 ·
High School For what elements does Born–Oppenheimer approximation fail the most?
- Lotto
- · Replies 1 ·
Graduate Maxwell theory invariant under dual field strength tensor application
- Mark99
- · Replies 3 ·
Undergrad Two Entropy scenarios on a system
- MatthewKM
- · Replies 4 ·
Undergrad Can the Transverse Nature of a Wave from an Electron Gun be Observed?
- Martyn Arthur
- · Replies 13 ·
Undergrad Proving Behavior of Particle in Infinite Potential: Wave Function?
- loversphisics
- · Replies 7 ·
High School Is superconductivity something usual or weird?
- Spathi
- · Replies 3 ·
Undergrad Is the mass of a photon stationary in space?
- azcowboy702
- · Replies 5 ·
High School Does Destructive Interference Affect Starlight in a Double Slit Experiment?
- Devin-M
- · Replies 110 ·
Undergrad Is a photon emitted in a particular direction?
- Green dwarf
- · Replies 9 ·
Graduate The experiment of Kim et al. (1999) (with small modification)
- grzegorzsz830402
- · Replies 10 ·
Graduate Purification of a Density Matrix
- Pete5876
- · Replies 4 ·
Undergrad Feynman's QED; 36,000 revolutions per inch for red light.
- anorlunda
- · Replies 1 ·
Undergrad Multiplying three vector operators
- Kashmir
- · Replies 3 ·
Graduate Absorption and emission spectrum in quantum optics
- Cedric Chia
- · Replies 4 ·
Undergrad Movement of protons between orbital bands in the nucleus
- SLSPS
- · Replies 11 ·
Undergrad Time/space symmetry in Dirac Equation
- stevendaryl
- · Replies 5 ·
Undergrad How to derive Schrodinger's equation?
- Astrocyte
- · Replies 9 ·
Undergrad The left-right symmetry and forbidden triplet spin state
- hokhani
- · Replies 21 ·
Undergrad Fermi's golden rule: why delta function instead of density states?
- yucheng
- · Replies 5 ·
Graduate Hamiltonian V and T of a lattice?
- James1238765
- · Replies 43 ·
Graduate Physical explanation of time-correlation function and spectrum
- Cedric Chia
- · Replies 3 ·
High School Spectral lines and superposition of states
- Yuras
- · Replies 11 ·
Graduate Jaynes-Cummings Hamiltonian: Where did the time dependence go?
- yucheng
- · Replies 4 ·
Graduate Did rotating polarizer show violations of Bell's Inequality?
- Ian J Miller
- · Replies 71 ·
Graduate Gamma matrices and Gell-Mann's I - Y categorization
- James1238765
- · Replies 22 ·
Graduate Definition of the Wilson action on a lattice plaquette?
- James1238765
- · Replies 2 ·
Undergrad Planck’s constant: Why are atom vibration frequencies integers only?
- Martyn Arthur
- · Replies 9 ·
Undergrad QED/Quantum Mechanics: Probability or Spatial Function?
- Inqur
- · Replies 8 ·
Graduate References: continuum approximation of discrete sums?
- yucheng
- · Replies 3 ·
Undergrad Can I use the Schrodinger picture when the Hamiltonian is time-dependent?
- Albfey
- · Replies 10 ·
Graduate Time Ordering Operator for Fermions & Bosons
- kanato
- · Replies 5 ·
High School Curious about this proposition for measuring for FTL
- Hereweald
- · Replies 2 ·
Graduate Why Are the Peaks at Δ = 0 and Δ = ω_m Equally High?
- LionCereals
- · Replies 1 ·
Undergrad What is the significance of recoupling in spin network theories?
- Heidi
- · Replies 2 ·
Undergrad Use of Gell-Mann matrices as the SU(3) basis for gluon states?
- James1238765
- · Replies 8 ·