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 Artificially discretized quantum states - is it a thing?
- Swamp Thing
- · Replies 1 ·
Undergrad Displacement operation acting on individual quadrature components
- waadles
- · Replies 3 ·
Graduate How Are Rotations on the Bloch Sphere Implemented in Practice?
- kelly0303
- · Replies 1 ·
Undergrad Phonon emission : Discrete event or a process with inner detail?
- Swamp Thing
- · Replies 2 ·
Undergrad "Wave-particle duality" and double-slit experiment
- HighPhy
- · Replies 36 ·
High School Does the observer effect in the double slit experiment require a human eye?
- Quarinteen
- · Replies 60 ·
Undergrad Feynman discussion of electron diffraction
- elou
- · Replies 23 ·
High School Disappearance of interference pattern in double slit
- elou
- · Replies 12 ·
Undergrad Example of SO(2) being not simply connected
- Hill
- · Replies 26 ·
Undergrad Is energy conserved when measuring a quantum system?
- KleinMoretti
- · Replies 12 ·
Undergrad Fundamental representation and adjoint representation
- shinobi20
- · Replies 27 ·
Undergrad Double Check Normalization Condition
- thatboi
- · Replies 1 ·
Graduate Do QFT propagators evolve states like quantum mechanics propagators?
- masteralien
- · Replies 13 ·
Graduate Gravity Measured with Milligram masses
- jedishrfu
- · Replies 3 ·
Graduate Noise in Landau–Zener transition
- kelly0303
- · Replies 0 ·
Graduate Why can't ESR detect short-lived radicals in dynamic systems?
- sha1000
- · Replies 5 ·
Undergrad Number of qubits needed to simulate the universe
- HighPhy
- · Replies 22 ·
Graduate Vector field vs. four scalar fields ("QFT and the SM", Schwartz)
- Hill
- · Replies 10 ·
Graduate Fisher information from likelihood function for quantum circuits
- Johny Boy
- · Replies 0 ·
Undergrad Why do orthogonal polarizers at slits eliminate interference pattern?
- ChadGPT
- · Replies 28 ·
Undergrad Is conservation of energy a local law in Quantum field theory?
- KleinMoretti
- · Replies 18 ·
Undergrad Why is there no single slit interference when one slit is closed in a double slit experiment?
- elou
- · Replies 55 ·
Graduate Does Matter Really Move Like a Wave and Hit Like a Particle?
- elou
- · Replies 4 ·
Undergrad How does a band pass filter increase the time of arrival of photons?
- Daniel Petka
- · Replies 2 ·
Undergrad Is the uncertainty principle applicable to single slit diffraction?
- greypilgrim
- · Replies 2 ·
Graduate How was the symmetry used here? ("QFT and the SM" by Schwartz)
- Hill
- · Replies 5 ·
Undergrad Are vacuum energy and vacuum fluctuations the same thing?
- KleinMoretti
- · Replies 1 ·
Undergrad Can a Third Particle Be Entangled with Two Existing Particles Without Breaking Their Entanglement?
- wnvl2
- · Replies 10 ·
Undergrad Heisenberg Equations of Motion for Electron in EM-field
- thatboi
- · Replies 9 ·
Graduate Derivation of energy-momentum tensor in "QFT and the SM" by Schwartz
- Hill
- · Replies 3 ·
Graduate Derivation of QM limit of QFT in "QFT and the SM" by Schwartz
- Hill
- · Replies 2 ·
Undergrad Speed of information in a medium
- neobaud
- · Replies 38 ·
High School How addition of vectors works if every force is quantized
- danielhaish
- · Replies 20 ·
Graduate What does lambda in nuclear decay mean if it is big?
- Tibetan Blackbird
- · Replies 3 ·
Undergrad Tunneling of light through thin metal films
- Dale
- · Replies 12 ·
Undergrad Electron wave addition using phasor diagram
- jjson775
- · Replies 8 ·
High School Is it possible to find the energy level of a hydrogen atom in this way?
- hongseok
- · Replies 4 ·
Undergrad Robertson uncertainty relation for the angular momentum components
- Yan Campo
- · Replies 2 ·
Undergrad Is the Vacuum Energy Density Sign Correct for Bosons?
- gerald V
- · Replies 3 ·
Undergrad Constant phase factors in wavefunctions
- Ibix
- · Replies 5 ·
Undergrad How Does a Qubit Exist as Both 1 and 0 Simultaneously?
- InquiringMind
- · Replies 2 ·
Undergrad When does the separation of variables work
- kelly0303
- · Replies 2 ·
Undergrad I want to expand a Gaussian wavepacket in terms of sines
- saadhusayn
- · Replies 2 ·
Undergrad Can a single photon of a single frequency pass through a FP cavity?
- Daniel Petka
- · Replies 29 ·
Undergrad How Do You Compute the Density Matrix of a Bipartite State?
- Rayan
- · Replies 2 ·
Undergrad Noether's Theorem in the Presence of a Charged Operator
- thatboi
- · Replies 1 ·
Undergrad The lore on complex probabilities
- arivero
- · Replies 4 ·
Undergrad Derivation of normal Zeeman-Effect
- PhysicsRock
- · Replies 5 ·
Undergrad Is a Time Rotation Operator Analogous to Spatial Rotations Possible?
- member 743765
- · Replies 2 ·
Undergrad Electromagnetic radiation, photons, quantized energy levels
- asf33
- · Replies 1 ·
Undergrad Are All Photons Truly Virtual?
- Hill
- · Replies 6 ·
Undergrad The classical concept of work in a QCD context?
- walkeraj
- · Replies 2 ·
Undergrad Virtuals particles, vacuum and infinite energy
- Donut
- · Replies 5 ·
Undergrad The theory on the effects of polarizers on particles wavefunctions
- tade
- · Replies 6 ·
Undergrad TISE solutions should be combinations-of-eigenstates, why this is not?
- JackeTheDog132
- · Replies 3 ·
Undergrad Is this a valid quantum Cheshire cat?
- pines-demon
- · Replies 13 ·
Undergrad Spin state, base transformation
- usai
- · Replies 3 ·
Graduate Question on Zeno time derivation
- Mainframes
- · Replies 4 ·
Graduate Did spatial dimensions emerge from the Big Bang?
- Eric Singer
- · Replies 19 ·
Graduate Fusion at lower energy cost than classical ion approach
- Mainframes
- · Replies 1 ·
Undergrad Interpreting bra-ket notation for probability amplitudes
- nomadreid
- · Replies 17 ·
High School Can entangled particle pairs be prepared with biased superposition probabilities?
- bulx
- · Replies 27 ·
High School How are the spins of two entangled photons measured at light speed?
- Walrus
- · Replies 6 ·
Graduate Can wave particle dualism be replaced by a monistic model?
- breakwater
- · Replies 2 ·
Undergrad Very basic questions about operators in QM
- olgerm
- · Replies 31 ·
Undergrad Why don't we bury Schrodinger's Cat?
- bushmonk
- · Replies 143 ·
Undergrad Coefficients in the Schrodinger equation and the momentum operator
- Shen712
- · Replies 7 ·
Undergrad A probability of field amplitude in QFT
- MichPod
- · Replies 23 ·
Graduate What happens when entangled photons are split into different paths?
- JamesPaylow
- · Replies 41 ·
High School Antiparticles moving opposite direction in time?
- rolnor
- · Replies 2 ·
Undergrad Double slit experiment with observer
- DoofWarrior
- · Replies 14 ·
Undergrad Deriving the Ginzburg criterion for the Ising model
- thatboi
- · Replies 1 ·
High School Are Schrodinger's cat and the double slit experiment the same idea?
- vadadagon
- · Replies 42 ·
High School Schrödingers cat, is it just mumbo-jumbo?
- rolnor
- · Replies 39 ·
Graduate Relationship between bare and renormalized beta functions
- Siupa
- · Replies 2 ·
Undergrad Normalization of wave functions
- Nana113
- · Replies 3 ·
Undergrad Is the photon field a vector field and a gauge field?
- syfry
- · Replies 6 ·
Graduate Quantitative description of successive Stern-Gerlach measurements
- Garlic
- · Replies 1 ·
Undergrad Most Likely Position of an Electron
- bob012345
- · Replies 30 ·
Undergrad Commutators, operators and eigenvalues
- dyn
- · Replies 7 ·
Undergrad How non-conscious can an Observer be and cause wave function collapse?
- pholmes
- · Replies 23 ·
High School Is the Born rule truly independent from other postulates in quantum mechanics?
- SCHROEDERFPM
- · Replies 26 ·
Graduate Don't understand equation with overleftrightarrow symbol
- joneall
- · Replies 10 ·
High School Quantum Physics Can Explain Earth’s Weather
- bhobba
- · Replies 20 ·
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 ·