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 Spin networks with different intertwiners
- Heidi
- · Replies 1 ·
Undergrad Al26 Meta Stable State: Forbidden Xray Transition?
- x_engineer
- · Replies 8 ·
Undergrad Understanding Entanglement and Born's Rule in Photon Polarization Experiments
- mbond
- · Replies 13 ·
High School Conceptual introduction to Feynman diagrams and QED
- DeltaForce
- · Replies 49 ·
Undergrad Feynman diagrams and sum over paths
- Husserliana97
- · Replies 5 ·
Undergrad Is elastic scattering of electrons by a solid possible?
- Philip Koeck
- · Replies 11 ·
Undergrad Creating NOON states by mixing classical and quantum light from SPDC
- James2018
- · Replies 16 ·
Undergrad Error of the WKB approximation
- phyQu
- · Replies 5 ·
Undergrad What causes qubit superpositions to form?
- oknow
- · Replies 9 ·
High School Why doesn't the detector affect the result?
- Mervinoc
- · Replies 9 ·
Undergrad The pattern of one photon at a time passing through large-distance setups?
- tade
- · Replies 32 ·
Undergrad Double-slit experiment, determining which slit an electron passed thru
- tade
- · Replies 26 ·
Graduate Changing Hamiltonian with some eigenvalues constant
- hilbert2
- · Replies 5 ·
Undergrad How is an interference pattern changed by an external field?
- tade
- · Replies 11 ·
Graduate The Probability Distribution of a Bosonic Field when Emitted
- JohnH
- · Replies 26 ·
Undergrad Other ways of finding expectation value of momentum
- VVS2000
- · Replies 8 ·
Undergrad Looking For Explanation of New Interferometer Article
- Hornbein
- · Replies 1 ·
Undergrad Is the magnetic moment of a hydrogen atom not equal to Bohr's magneton?
- computer
- · Replies 22 ·
Undergrad Question on bra vs ket notation
- Ahmed1029
- · Replies 6 ·
High School Tachyons and imaginary numbers?
- BadgerBadger92
- · Replies 15 ·
High School Tensor product of operators and ladder operators
- Heidi
- · Replies 2 ·
Undergrad Why are Planck units considered fundamental?
- Conn_coord
- · Replies 23 ·
Undergrad Double-slit experiment with momentum entangled pair of photons
- Christian Thom
- · Replies 7 ·
Undergrad Speed of individual photons in a vacuum?
- LarryS
- · Replies 71 ·
Undergrad Measurement accuracy or variation
- Conn_coord
- · Replies 1 ·
Undergrad How does a process of a Raman transition break quantum entanglement?
- tade
- · Replies 6 ·
Undergrad What is this notation D|(n;n')|, and how to solve it?
- K-Manu
- · Replies 3 ·
Undergrad Spin expectation value for one particle vs actual measurement
- Ahmed1029
- · Replies 4 ·
High School How is energy transferred from a wave to a photon?
- curiouschris
- · Replies 18 ·
Undergrad About photon-polariser interaction quantum-molecular-level mechanics
- tade
- · Replies 2 ·
Undergrad Curious about an idea of a modified polariser to send signals with QE
- tade
- · Replies 99 ·
Undergrad Weinberg Lectures in QM (2013 Ed.), Equation 7.10.15
- jouvelot
- · Replies 8 ·
Undergrad Quantum mechanics stationary state
- happyparticle
- · Replies 2 ·
Undergrad Negative energy when a laser goes through lithium niobate crystal?
- gggnano
- · Replies 13 ·
Undergrad Density Operators of Pure States
- Dario56
- · Replies 21 ·
Undergrad Time-energy uncertainty relation
- dyn
- · Replies 33 ·
Undergrad Can I find a particle in two states simultaneously?
- Ahmed1029
- · Replies 2 ·
Undergrad Analytical proof of LASER production
- SteveHowe73
- · Replies 3 ·
Undergrad New Nobel Aspect contradicts himself on action at a distance bel
- RayTomes
- · Replies 2 ·
Undergrad Predetermination in quantum theory and information theory
- Green dwarf
- · Replies 15 ·
Undergrad In Bell's Theorem, communication
- ndvcxk123
- · Replies 1 ·
High School Will Quantum Entanglement Lead to a 2022 Nobel Prize in Physics?
- Duplex
- · Replies 2 ·
Graduate Many-Particle Wavefunction Question
- CuriousLearner8
- · Replies 13 ·
Undergrad Energy from quantum systems in an expanding universe?
- Suekdccia
- · Replies 1 ·
Graduate Concept of wavefunction and particle within Quantum Field Theory
- Jufa
- · Replies 7 ·
Undergrad Postive rays in cathode ray tube experiments?
- sol47739
- · Replies 2 ·
Graduate Why is the Clebsch-Gordan coefficient zero for l+1 with m₁=0, m₂=0?
- euphoricrhino
- · Replies 7 ·
Undergrad Wave packet experimental detection
- VVS2000
- · Replies 4 ·
Graduate Does there exist a proof for these conjectures?
- hilbert2
- · Replies 2 ·
High School What’s the necessity of the strong force?
- Th3
- · Replies 2 ·
Undergrad About normalization of periodic wave function
- KFC
- · Replies 4 ·
High School Is there another workable interpretation of the Bell Inequality?
- .Scott
- · Replies 4 ·
Undergrad How can gravitons have anti particles?
- BadgerBadger92
- · Replies 24 ·
Undergrad Why does the QFT Lagrangian not already use operators?
- Gerenuk
- · Replies 11 ·
Undergrad Is Planck's Law of Black-Body Accurate?
- happyparticle
- · Replies 7 ·
Undergrad What sense does it make to "weigh" a Casimir cavity?
- timmdeeg
- · Replies 9 ·
Undergrad Einstein summation convention in QM
- dyn
- · Replies 19 ·
Undergrad Has the Unruh Effect ever been observed?
- lindberg
- · Replies 13 ·
Undergrad Quantum events near a black hole
- gnnmartin
- · Replies 25 ·
Undergrad How Do Radio Antennas Function in Quantum Mechanics?
- sol47739
- · Replies 4 ·
Undergrad Time-dependent to time-independent Schrödinger equation
- LagrangeEuler
- · Replies 5 ·
Graduate What is a "transient" value in the Ising model?
- user366312
- · Replies 1 ·
High School About infinity and all possibilities of Multiverse/Omniverse
- Ug Nagdi
- · Replies 14 ·
Undergrad Haag's Theorem: Explain Free Field Nature
- lindberg
- · Replies 4 ·
Undergrad Learning Planck's constant from the photoelectric effect experiment
- Hakimderubeis
- · Replies 4 ·
Matrices Often Used in Quantum Computing
- Ackbach
- · Replies 3 ·
Undergrad The CMB has a thermal black body spectrum
- Conn_coord
- · Replies 18 ·
Undergrad Polarization of photons quantum mechanically
- sol47739
- · Replies 3 ·
High School Understanding Waves, Particles and Probabilities
- geordief
- · Replies 2 ·
Undergrad Does chaos amplify inherent quantum level randomness?
- Physicist248
- · Replies 39 ·
Undergrad Detecting the sign change when a spinor rotates through 360 degrees
- wnvl2
- · Replies 1 ·
Undergrad Operators in finite dimension Hilbert space
- Sebas4
- · Replies 7 ·
Graduate What are the basic mathematical objects in QFT?
- snoopies622
- · Replies 7 ·
Undergrad How does one compute the Fourier-Transform of the Dirac-Hamiltonian?
- PhysicsRock
- · Replies 6 ·
Different Kinds of Quantum Computing Measurement Operators
- Ackbach
- · Replies 2 ·
Undergrad Understanding No Energy Degeneracy in Sakurai's Quantum Mechanics
- euphoricrhino
- · Replies 2 ·
Graduate Requirements for EIT with pulsed laser
- wangvivi
- · Replies 1 ·
Undergrad Where does the QM creation operator get its energy?
- joneall
- · Replies 29 ·
Undergrad Inner product - positive or positive semidefinite?
- dyn
- · Replies 21 ·
Undergrad The Wavefunction when Mass is Much Greater than Planck's Constant
- JohnH
- · Replies 21 ·
Undergrad Wondering why quantum entanglement occurs
- ebmg123
- · Replies 2 ·
Quantum Computing: Positive Operators are Hermitian
- Ackbach
- · Replies 2 ·
Undergrad Why is the SE better than the KG equation for a hydrogen atom?
- snoopies622
- · Replies 18 ·
High School Heisenberg's Uncertainty Principle and determinism
- riballoon
- · Replies 13 ·
High School Sinusoidal wave function of t and x
- Ennio
- · Replies 2 ·
Undergrad Vector operator acting on a ket gives a ket out of the state space
- Kashmir
- · Replies 11 ·
High School Positive Definite Cartan Matrices in Quantum Physics
- fresh_42
- · Replies 6 ·
Undergrad Can split photons have different spin probability than unsplit photons?
- ndvcxk123
- · Replies 2 ·
Undergrad What is so compelling in the superposition theorem?
- jinto26
- · Replies 3 ·
Undergrad Inner and Outer Product of the Wavefunctions
- Dario56
- · Replies 8 ·
Undergrad Understanding Wave Function Probabilities for a Free Particle
- jjson775
- · Replies 25 ·
Undergrad Entanglement and FTL signaling in professional scientific literature
- Delta2
- · Replies 276 ·
Undergrad How does atomic absorption spectroscopy work
- Login
- · Replies 1 ·
High School The relationship between the particle, the wave and the field
- geordief
- · Replies 8 ·
Graduate Coherent quantization, the non-unitary case
- mitchell porter
- · Replies 5 ·
High School Can quantum probabilities ever be exactly zero?
- CosmicVoyager
- · Replies 4 ·
Graduate Matrix representation of a unitary operator, change of basis
- Kashmir
- · Replies 1 ·
High School Is the quantum concept of a photon still poorly understood?
- CPW
- · Replies 32 ·
Graduate Is there a lost information paradox for quantum physics?
- Heidi
- · Replies 16 ·
Graduate Why does stimulated Raman emission require strong phonon damping?
- ure227922
- · Replies 2 ·