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.
Threads
Graduate Can particles appear and disappear "with" a cause?
- zaramahdi
- · Replies 1 ·
High School Why do photons not experience time?
- rolnor
- · Replies 33 ·
Undergrad Why must the state transformation be unitary?
- eoghan
- · Replies 7 ·
Undergrad What is the Uncertainty in the Total Weight of a Collection of Similar Items?
- JT Smith
- · Replies 12 ·
Undergrad Does photon speed affect the delayed choice quantum eraser?
- rolnor
- · Replies 15 ·
High School Does the Wavefunction of an Electron Collapse When Captured by a Proton?
- syfry
- · Replies 13 ·
Undergrad The electron is not point-like?
- birdhouse
- · Replies 21 ·
Undergrad Normalizing the wavefunction F = Cexp(-r/a)
- jqmhelios
- · Replies 10 ·
Undergrad How can electron transitions occur if photon wavelength is continuous?
- Joe Prendergast
- · Replies 20 ·
High School Double-slit experiment
- Jason Ko
- · Replies 7 ·
Undergrad Understanding Ground State Degeneracy in the Transverse Ising Model
- thatboi
- · Replies 0 ·
Graduate Feynman loop diagrams and Dyson series for anomalous magnetic moment
- Adrian59
- · Replies 80 ·
Graduate Photon Bouncing during APD Dead Time in Autocorrelation Measurement
- Theo2907
- · Replies 1 ·
Graduate Do time crystals require periodic energy input to maintain their periodic structure?
- LightningInAJar
- · Replies 10 ·
Graduate Understanding Ghost Fields in QED: Eliminating Unphysical Degrees of Freedom"
- The Tortoise-Man
- · Replies 9 ·
Undergrad The last step of this Green's function proof is not clear
- Hill
- · Replies 7 ·
Undergrad Intersection of Condensed Matter Theory + High Energy Physics
- thatboi
- · Replies 0 ·
Undergrad Fine Structure Constant - 10 steps
- Garry Goodwin
- · Replies 4 ·
Graduate Does the Zeno effect freeze all the commuting observables?
- Heidi
- · Replies 1 ·
Graduate How Does Position Interact with Spin Angular Momentum in Quantum Mechanics?
- dnl914
- · Replies 2 ·
Graduate Commutator of fermion bilinears with Pauli matrices
- Gleeson
- · Replies 1 ·
Undergrad Correlation Matrix of Quadratic Hamiltonian
- thatboi
- · Replies 1 ·
Undergrad When do classical mechanics and electromagnetics stop working?
- jmheer
- · Replies 8 ·
Graduate Problem evaluating an anticommutator in supersymmetric quantum mechanics
- Gleeson
- · Replies 3 ·
Undergrad Photoelectric effect and Saturation Current
- fog37
- · Replies 12 ·
Undergrad What makes up the bare mass of elementary particles?
- timmdeeg
- · Replies 3 ·
Undergrad Why doesn't two-photon absorption cause photoelectric emission below threshold?
- ParsaEF
- · Replies 5 ·
Undergrad Looking for resources to learn bra-ket notation
- zoltrix
- · Replies 3 ·
Undergrad Can hidden variables theory avoid simultaneously real properties in Bell's theorem?
- Lynch101
- · Replies 80 ·
Graduate First Order in Time Derivatives + Phase Space
- thatboi
- · Replies 1 ·
High School Definition of a random variable in quantum mechanics?
- Aidyan
- · Replies 12 ·
Undergrad Hall Conductivity and Rotational Invariance
- thatboi
- · Replies 1 ·
Graduate Are there any hypercomplex time values?
- DyerMaker
- · Replies 8 ·
Undergrad Generic Form of Hermitian Matrix
- thatboi
- · Replies 1 ·
Undergrad What Causes Ambiguity in Wick Rotation for Time-Ordered Correlators?
- thatboi
- · Replies 0 ·
High School Can we say a photon doesn't exist until the wavefunction collapses?
- Kavi
- · Replies 16 ·
Undergrad Boundary conditions for the momentum space SE
- andresB
- · Replies 17 ·
Graduate Wigner Weisskopf method for time varying Perturbation
- masteralien
- · Replies 3 ·
Undergrad Why is entanglement necessary in a quantum computer?
- Trikenstein
- · Replies 8 ·
Undergrad How does the quantum of action cause indeterminism?
- pholmes
- · Replies 6 ·
Undergrad Measurements and uncertainty principle
- daniel444
- · Replies 12 ·
Undergrad Physical Meaning of the Imaginary Part of a Wave Function
- deuteron
- · Replies 1 ·
Undergrad In the delayed-choice quantum eraser, why is a stepper motor used?
- murtazashab
- · Replies 2 ·
High School Entangled quants inside a particle accelarator
- SchrodingersQuants
- · Replies 4 ·
Undergrad How did Sommerfeld arrive at his quantum condition?
- Half Infinity
- · Replies 6 ·
Undergrad Why is Photon Energy Quantized in Terms of Sine Wave Frequency?
- QuantumCuriosity42
- · Replies 78 ·
Undergrad Force of an Electron on a Potential Wall?
- HarrisonG
- · Replies 7 ·
Undergrad Dirac delta identity in Fetter and Walecka equation 12.38
- thatboi
- · Replies 2 ·
Undergrad Klein-Gordon equation and continuity equation
- dyn
- · Replies 6 ·
Undergrad Problem with the polarization of entangled photons
- Christian Thom
- · Replies 7 ·
Undergrad Can AIs act as conscious observers?
- jeast
- · Replies 12 ·
Undergrad Non-wave solution to wave equation and virtual particles
- Fefetltl
- · Replies 9 ·
Undergrad Does the electron emit the photon when it transitions to lower energy?
- Wanda
- · Replies 21 ·
Undergrad What Is the Smallest Change Detected by a Multiport Interferometer?
- Precious Adegbite
- · Replies 0 ·
Undergrad Trouble with Product of Green's Functions
- thatboi
- · Replies 0 ·
Undergrad Why do exponential functions occur outside of finite walls?
- jjson775
- · Replies 9 ·
Graduate "Nonclassical Advantage in Metrology" paper
- PeterDonis
- · Replies 0 ·
Undergrad Why does de Broglie wavelength approach infinity as velocity approaches zero?
- Kavi
- · Replies 5 ·
Undergrad Mass Dimension of Fields (Momentum space)
- thatboi
- · Replies 2 ·
Undergrad Why does photoelectron energy spread with fixed delay in attosecond metrology?
- genxium
- · Replies 2 ·
Undergrad Can an atom absorb a photon, yet its total kinetic energy is decreased?
- avicenna
- · Replies 54 ·
Undergrad Lindbladian Jump Operators Condition
- thatboi
- · Replies 0 ·
Graduate Phase difference between electric and magnetic dipole moment
- kelly0303
- · Replies 0 ·
Undergrad How Is the Mixed State Density Matrix Represented in Quantum Computing?
- thatboi
- · Replies 8 ·
Undergrad Density Matrix of Multiple Qubits
- thatboi
- · Replies 9 ·
Undergrad Does the Photon Play a Crucial Role in Quantum Mechanics?
- neobaud
- · Replies 64 ·
High School What is causing destructive interference in double slit experiment?
- Addez123
- · Replies 32 ·
Graduate Is entanglement also for time-like intervals?
- Heidi
- · Replies 3 ·
Undergrad Is entanglement a consequence of the singularity of the early universe?
- malvernstar
- · Replies 2 ·
Undergrad Looking for resources about tunneling effect on two delta functional barriers
- Andre_86
- · Replies 1 ·
Undergrad How Is the Integral from (3-22) to (3-23) Calculated in Quantum Mechanics?
- jamal_lamaj
- · Replies 5 ·
Undergrad Confusion about Scattering in Quantum Electrodynamics
- physwiz222
- · Replies 134 ·
Undergrad About time-independent non-degenerate perturbation expansion
- Ishika_96_sparkles
- · Replies 3 ·
Undergrad Magnetic flux through a superconducting ring
- Lagrange fanboy
- · Replies 5 ·
High School Frequency of an EM wave in Classical and Quantum Physics
- Hak
- · Replies 6 ·
Graduate How to draw the angles of the CKM matrix?
- Heidi
- · Replies 3 ·
High School Quantum Nonlocality or Non Counterfactual Definiteness?
- Point Conception
- · Replies 3 ·
High School What is the size of a VHF photon?
- Dante Meira
- · Replies 11 ·
High School Why doesn't the electron "wave" collapse at the double-slit?
- francis20520
- · Replies 28 ·
Undergrad Quantum behavior experiment flawed?
- tistemfnp
- · Replies 40 ·
Undergrad Is it possible for a BBO crystal to produce an interference pattern?
- Herbascious J
- · Replies 1 ·
Undergrad Measurement and Thermal Effects Similar?
- bushmonk
- · Replies 18 ·
Undergrad Recommendations for learning renormalization?
- RobertGC
- · Replies 18 ·
Graduate Creation and annihilation operator
- Sebas4
- · Replies 3 ·
Graduate Solving renormalization group equation in QFT
- qft-El
- · Replies 5 ·
High School Is Quantum Mechanics necessary for understanding electromagnetic phenomena?
- brianhurren
- · Replies 2 ·
Undergrad Energies of bound state for delta function potential
- ErwinZumer
- · Replies 2 ·
High School Searching for Quantum Mechanics Lecture on Delayed Choice Experiment
- kesha1
- · Replies 15 ·
Undergrad How to distinguish between diagonal vs horizontal/vertical polarization?
- JamesPaylow
- · Replies 15 ·
Undergrad Point of Demarcation between Quantum and Classical Behavior
- Twodogs
- · Replies 12 ·
Graduate Are irreversible processes absolutely irreversible, even given infinite time?
- Kinker
- · Replies 1 ·
Undergrad Is Calcite a parallel to the Stern-Gerlach experiment?
- Frigorifico9
- · Replies 43 ·
Graduate Renormalized vertex functions in terms of bare ones
- Siupa
- · Replies 0 ·
Undergrad How does one time-evolve a quantum state with its kernel function?
- Sciencemaster
- · Replies 0 ·
Graduate Quantization of real Klein-Gordon field (sign issues)
- The Tortoise-Man
- · Replies 24 ·
Graduate Anti-commutation relation for quantized fields
- The Tortoise-Man
- · Replies 13 ·
Undergrad Black Hole Fire Walls, Brick Walls, and the Casimir Effect
- .Scott
- · Replies 6 ·
Undergrad Impossible probability between theoretical possibility and reality
- Kinker
- · Replies 23 ·
High School Quantum Entanglement in Practice
- Pixelex
- · Replies 2 ·
High School Does decoherence prevent 100% of quantum tunneling of macro object?
- Kinker
- · Replies 4 ·