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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High School How does entanglement work for spin states?
- JustinHolmik
- · Replies 3 ·
Undergrad Why does the kinetic operator depend on a second derivative?
- Steven Hanna
- · Replies 5 ·
Undergrad Why is the KE operator negative in QM?
- sungholee
- · Replies 10 ·
Undergrad If operators commute then eigenstates are shared
- davidbenari
- · Replies 14 ·
Undergrad Probability current in positive finite square potential
- Joker93
- · Replies 17 ·
High School What is quantum equation of single photon?
- fxdung
- · Replies 10 ·
Undergrad Photons on a CCD Vs. the magnetic or electric vector?
- DavidReishi
- · Replies 4 ·
Undergrad Angular momentum ladder operator derivation
- Sara Kennedy
- · Replies 10 ·
Undergrad How can I confirm Lz=ħ,0,-ħ using operators and eigenfunctions?
- kenyanchemist
- · Replies 4 ·
Undergrad Probability distribution plots
- kenyanchemist
- · Replies 7 ·
Undergrad How Does Superradiance Enhance Radiation Intensity?
- TheCanadian
- · Replies 1 ·
Undergrad Is the wavefunction a physical quantity?
- lightarrow
- · Replies 1 ·
Undergrad Transition probability and superposition
- amjad-sh
- · Replies 2 ·
Undergrad Demerits radial distribution functions
- kenyanchemist
- · Replies 3 ·
Undergrad Applying Heisenberg uncertainty principle to a particle in a box
- Sum Guy
- · Replies 2 ·
Graduate Quantum Entanglement Harvesting
- sanman
- · Replies 2 ·
Undergrad When can one clear the operator
- Ernesto Paas
- · Replies 8 ·
Undergrad Rotational-Vibrational Energy state equation derivation
- EphemeralMurex
- · Replies 4 ·
Undergrad Width of a stationary wave packet as a function of time
- Bernard
- · Replies 7 ·
High School Mixed states V superposition V linear combinations?
- houlahound
- · Replies 24 ·
Undergrad Square of absolute value of amplitude for a single photon
- DavidReishi
- · Replies 12 ·
Graduate Integration of Schrodinger equation
- spaghetti3451
- · Replies 5 ·
Graduate Hamiltonian and constant potential
- MBPTandDFT
- · Replies 14 ·
Undergrad Important theorems and equations in quantum teleportation
- AleksanderPhy
- · Replies 2 ·
Undergrad What is a quantum spin liquid?
- Kevin McHugh
- · Replies 4 ·
Graduate Performing Bell State Measurement in Teleportation
- ljagerman
- · Replies 4 ·
Undergrad Density matrices, pure states and mixed states
- entropy1
- · Replies 17 ·
Undergrad What is an electron's orbital angular momentum?
- edguy99
- · Replies 2 ·
Undergrad Does partial tracing commute with Hamiltonian action?
- naima
- · Replies 1 ·
Undergrad Technical question about modern Double Slit w/ one photon
- DavidReishi
- · Replies 9 ·
Undergrad Bound electrons vs. free electrons
- drl
- · Replies 9 ·
Graduate Is Poincare symmetry the real thing?
- A. Neumaier
- · Replies 31 ·
Undergrad Status of Adami's solution to Firewall paradox?
- nomadreid
- · Replies 4 ·
High School When does reflection occur in absorptive materials?
- 123physics321
- · Replies 4 ·
Undergrad The most general state function
- TheCanadian
- · Replies 6 ·
Graduate Does wave function collapse lose information in black hole evaporation?
- secur
- · Replies 12 ·
Undergrad "Light is wave-like and particle-like" --- Why this is wrong?
- DavidReishi
- · Replies 10 ·
Undergrad Non-commuting operators on the same eigenfunctions
- TheCanadian
- · Replies 1 ·
Undergrad Inverse square law and ensembles of photons
- DavidReishi
- · Replies 25 ·
Graduate Resolution in single molecule localisation
- u0362565
- · Replies 3 ·
Undergrad Are photons from atomic cascade directly entangled?
- zonde
- · Replies 9 ·
Undergrad Hartree fock derivation problem
- georg gill
- · Replies 3 ·
Graduate The Nonlinear Schrödinger Equation
- roam
- · Replies 7 ·
High School Communication with no latency using quantum entanglement
- hewiiitt-
- · Replies 23 ·
Graduate Quantum versus classical computation of the density of state
- Jip
- · Replies 1 ·
High School Question: Can State Only Be Formulated Relating to Observable?
- entropy1
- · Replies 8 ·
High School How Does Neutral Pion Decay Conform to Spin Conservation?
- simon96c
- · Replies 5 ·
Undergrad Implication of eigenstates that are not normalizable
- TheCanadian
- · Replies 7 ·
Undergrad Why is Planck radiation the most radiation a body can emit?
- Julia Coggins
- · Replies 3 ·
Graduate Derivative of self-energy in Peskin & Schroeder 7.31
- dosantos86
- · Replies 1 ·
Undergrad Why isn't open quantum system evolution unitary if the trace stays 1?
- jamie.j1989
- · Replies 4 ·
Graduate Fermis golden rule and transition rates
- mupsi
- · Replies 3 ·
Graduate Lorentz invariance of the Heaviside function
- spaghetti3451
- · Replies 1 ·
Undergrad Can Monte Carlo Wave Functions Capture Driven and Dissipative Quantum Dynamics?
- jamie.j1989
- · Replies 1 ·
Graduate Solution of the classical Klein-Gordon equation
- spaghetti3451
- · Replies 10 ·
Graduate Monte Carlo Wavefunction Methods
- Raptor112
- · Replies 1 ·
Undergrad Mathematics of tensor products in the Bell states
- PerilousGourd
- · Replies 4 ·
Undergrad Quantized Energy in micro scales
- 3dot
- · Replies 3 ·
Undergrad How to justify the angular momentum operator in quantum mechanics
- barnflakes
- · Replies 42 ·
Graduate Where Can I Find the Published Paper on Bose-Einstein Statistics by Einstein?
- chikou24i
- · Replies 4 ·
Graduate Canonical Commutation Relations in finite dimensional Hilbert Space?
- "pi"mp
- · Replies 10 ·
Graduate How Do Quantum Dots Differ from Quantum Wells in Quantum Optical Properties?
- vtahmoorian
- · Replies 8 ·
High School Where Do Quantum Gravity and Cosomology Fit in Physics?
- Peter25samaha
- · Replies 19 ·
Graduate How Does the Presence of Gas Affect Decoherence in a Stern-Gerlach Experiment?
- naima
- · Replies 10 ·
Undergrad Delayed Choice Quantum Eraser Question
- 04qWIGk3
- · Replies 8 ·
Undergrad Laser diffraction through single slit
- Danyon
- · Replies 3 ·
Undergrad Why is QM (almost) local, with one exception?
- tzimie
- · Replies 1 ·
Graduate Why open quantum systems need stochastic effective dynamics
- A. Neumaier
- · Replies 212 ·
Undergrad Can particle-wave duality create unique signatures in patterns?
- Felix Quintana
- · Replies 6 ·
Undergrad Transition rules for a trapped ion
- jamie.j1989
- · Replies 5 ·
Graduate Do entangled particles decay simultaneously?
- xtempore
- · Replies 7 ·
Graduate CO2 Laser Beam Folding for 10kw Power Output
- rppearso
- · Replies 4 ·
Graduate Misunderstanding Eberhard's paper on FTL communication?
- secur
- · Replies 15 ·
Undergrad Triplet States and Wave Functions
- sungholee
- · Replies 9 ·
Undergrad Can basic concepts explain EIT, LWI, and STIRAP?
- secur
- · Replies 1 ·
Undergrad Symmetry of Hamiltonian and eigenstates
- Sum Guy
- · Replies 7 ·
Undergrad Scattering theory (some confusion)
- amjad-sh
- · Replies 14 ·
Undergrad How does a photon's wave energy propagate through free space?
- Peter99
- · Replies 30 ·
Graduate Is CPT Symmetry Inherent in All Quantum Field Theories?
- wotanub
- · Replies 2 ·
High School How to compare camera film ISO number to quantum efficiency?
- Khashishi
- · Replies 32 ·
High School Is quantification random or pseudo-random?
- entropy1
- · Replies 7 ·
Graduate WKB Approximation: Suggestions for Starting Points
- Mrinmoy Naskar
- · Replies 1 ·
Undergrad EM Wave Components for a Photon?
- LarryS
- · Replies 5 ·
Undergrad Do All Physical States Satisfy the Hamiltonian Equation Hψ = Eψ?
- Pyrus96
- · Replies 1 ·
Graduate Quantum Stealth invisibility claims by Hyperstealth
- FalconOne
- · Replies 10 ·
High School Does retrocausality only apply to subatomic particles?
- question99
- · Replies 4 ·
High School Why does entropy increase when mixing identical classical gases?
- fxdung
- · Replies 19 ·
Undergrad Integral computation in scattering theory
- jouvelot
- · Replies 3 ·
Undergrad Condition for quantum entanglement?
- bbbl67
- · Replies 6 ·
High School Does Electromagnetic wave qualifies to become a particle?
- Ronie Bayron
- · Replies 2 ·
Undergrad Describing Energy for Time-Dependent States
- Isaac0427
- · Replies 25 ·
Undergrad Keeping a subspace decoherence free, with the Zeno Effect
- qwertuiop
- · Replies 5 ·
Undergrad Does Anti-Information Exist in Quantum Theory?
- Jason White
- · Replies 3 ·
High School Electron arrangement and ionisation energy
- Gajan1234
- · Replies 1 ·
Undergrad Legitimacy of Particle-Wave Duality
- Zacarias Nason
- · Replies 7 ·
Graduate What do people mean by "dynamical phase transition"?
- tiger2012
- · Replies 2 ·
Undergrad Coupling Spin-0 and spin-1 fields
- PLANCKTHEORY
- · Replies 3 ·
High School A question of timing in a light bulb
- tionis
- · Replies 15 ·
Undergrad Are electrons in a shared shell quantumly entangled?
- bbbl67
- · Replies 18 ·
Undergrad How Does Decoherence Affect Our Perception of Quantum Superpositions?
- durant35
- · Replies 15 ·