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 Could we “cheat” and send a message back in time with a measurement?
- Maximum7
- · Replies 7 ·
High School Why can't entangled particles have pre-defined orientations?
- imsmooth
- · Replies 32 ·
High School What does it mean for a macroscopic glass sphere to be in its lowest quantum state?
- Grinkle
- · Replies 17 ·
Insights Schrödinger’s Cat and the Qbit
- RUTA
- · Replies 46 ·
Undergrad Derivation of "polarization drift" in a plasma
- Axel Togawa
- · Replies 3 ·
Undergrad Valid to use <1/r3> to get spin-orbit correction to H? (perturbation)
- Happiness
- · Replies 5 ·
Undergrad Measuring Second-Order Correlation Function with Start and Stop Signal
- KjUy
- · Replies 2 ·
Graduate Do entanglement networks encode a unique, local historical record?
- asklepian
- · Replies 2 ·
High School Transferring information faster than the speed of light
- Reality Researcher
- · Replies 24 ·
Undergrad Field Operator for Edge States
- thatboi
- · Replies 1 ·
Graduate Can humans really create the quantum computer they expected?
- george1962
- · Replies 2 ·
Undergrad Tunneling with Gaussian Wave Packet
- Tertius
- · Replies 2 ·
Undergrad Researchers find experimental evidence for a graviton-like particle
- laymanhobbist
- · Replies 17 ·
Undergrad A measured spin is still a Qbit
- Gary Venter
- · Replies 3 ·
Undergrad Can Heisenberg uncertainty explain single-slit diffraction patterns?
- J O Linton
- · Replies 22 ·
Undergrad Quantum Eraser Experiment at home
- Bila
- · Replies 1 ·
Undergrad Single slit diffraction and the HUP
- J O Linton
- · Replies 25 ·
Undergrad Breaking the Light Speed Barrier?
- SWIRF
- · Replies 5 ·
Undergrad The photoelectric effect: What frequency does υₛ refer to in the work function?
- JACKR
- · Replies 9 ·
Graduate Interpreting the energy density of QFT vacuum states
- math-physicist
- · Replies 3 ·
Undergrad Ground state returning to initial state with Gaussian perturbation at ω but not 2ω
- Rayan
- · Replies 3 ·
High School Heisenberg's indeterminacy principle with non-point particles ?
- Standard
- · Replies 16 ·
Undergrad Different Approaches to the Time Dependent Variational Principle
- Matthew_
- · Replies 0 ·
High School Question about Bell's inequalities and 3-particle entanglement
- Isaac Hart
- · Replies 14 ·
Undergrad Finite potential well transmission coefficient
- lys04
- · Replies 11 ·
Undergrad Testing superposition of spacetime curvature
- Maximus_Ann
- · Replies 1 ·
Undergrad [QFT-Schwartz Page. 256] Violation of operator exponentiation rule ?
- Golak Bage
- · Replies 2 ·
High School Quantum teleportation of usable information
- Isaac Hart
- · Replies 19 ·
Graduate What is the meaning of "Amplitude of Detection" in A. Zee's QFT book?
- Golak Bage
- · Replies 1 ·
Undergrad Why do hermitian operators give measurement values as eigenvalues?
- deuteron
- · Replies 3 ·
Undergrad Color charge is not scalar -- do their components have dimensions?
- south
- · Replies 12 ·
Undergrad The Dirac equation as a linear tensor equation for one component
- akhmeteli
- · Replies 0 ·
Undergrad Generalized Eigenvalues of Pauli Matrices
- thatboi
- · Replies 1 ·
Undergrad Planck's Constant times the speed of light
- LarryS
- · Replies 11 ·
Undergrad Eigenstates of particle with 1/2 spin (qbit)
- cianfa72
- · Replies 24 ·
Undergrad If the gravitational constant had a different value
- Ranku
- · Replies 13 ·
Graduate How produce twin photons in practice?
- Quant
- · Replies 3 ·
Undergrad What are anomalies in quantum field theory?
- KleinMoretti
- · Replies 4 ·
Undergrad Qubits state calculation
- Hennessy
- · Replies 6 ·
Undergrad Quantum mechanics formalisms and conservation of energy
- KleinMoretti
- · Replies 11 ·
Undergrad When and why can ∂p/∂t=0 in position space?
- George Keeling
- · Replies 15 ·
Undergrad EPR in Bohm formulation
- cianfa72
- · Replies 45 ·
Undergrad How to enter measurement results into Bell inequality?
- greypilgrim
- · Replies 17 ·
Undergrad Why doesn't gravity cause double-slit decoherence?
- oknow
- · Replies 11 ·
High School Could energy be destroyed during particle annihilation?
- KleinMoretti
- · Replies 16 ·
Undergrad Bell tests: Changing detector settings "just before photon arrives"
- greypilgrim
- · Replies 4 ·
Graduate X measurement modeled in non-separable Hilbert space
- normvcr
- · Replies 9 ·
Undergrad Klein-Gordon Equation with boundary conditions
- dsaun777
- · Replies 1 ·
Graduate Testing antimatter fundamentals
- WeeWillieWinkie
- · Replies 7 ·
Undergrad Conservation of energy and wave function collapse
- KleinMoretti
- · Replies 33 ·
Undergrad How to "derive" momentum operator in position basis using STE?
- LightPhoton
- · Replies 3 ·
Undergrad Freqeuncy of Matter Waves Approaches Infinity as Velocity Approaches c
- hisgutsaysmaybe
- · Replies 2 ·
Undergrad Material Waves and Wave Functions
- deuteron
- · Replies 9 ·
High School How do quantum phenomena affect macroscopic phenomena?
- curiosity1
- · Replies 11 ·
Graduate Mixed quantum state of the Bose-Einstein distribution
- Bertt
- · Replies 3 ·
Undergrad Quantum particle's state in momentum eigenfunctions basis
- cianfa72
- · Replies 16 ·
High School Using Interference Principles to Increase the Efficiency of Solar Panels
- DUOScoins
- · Replies 0 ·
Undergrad Is quantum interference an instantaneous consequence of superposition ?
- Husserliana97
- · Replies 12 ·
Graduate How to know the number of Feynman diagrams for a given order?
- pines-demon
- · Replies 0 ·
Undergrad Completeness of Eigenfunctions of Hermitian Operators
- gaiussheh
- · Replies 22 ·
Undergrad Does gravity cause quantum decoherence?
- Kinker
- · Replies 20 ·
Graduate What is decoherence?
- PeterDonis
- · Replies 15 ·
Undergrad Original HBT experiment with mercury isotope lamp
- Swamp Thing
- · Replies 2 ·
Graduate Spontaneous emission and coherence
- kelly0303
- · Replies 1 ·
Undergrad How is spin exchange interaction generalised to many electrons?
- gaiussheh
- · Replies 2 ·
Undergrad Electrons keeping dynamical quantum fluctuations?
- Suekdccia
- · Replies 0 ·
Undergrad Observing observables of an entity
- quantum philosopher
- · Replies 9 ·
High School Does a photon's energy change as it refracts?
- maxelcat
- · Replies 4 ·
Undergrad Does entanglement always conserve something?
- Swamp Thing
- · Replies 9 ·
Undergrad Qbit pure vs mixed state space
- cianfa72
- · Replies 35 ·
Graduate A particle locked inside an arrangement of Dirac delta potentials
- hilbert2
- · Replies 4 ·
Undergrad Wave packet interpretation
- selfsimilar
- · Replies 7 ·
Undergrad Representation of Spin 1/2 quantum state
- cianfa72
- · Replies 61 ·
Undergrad Energy and momentum of a photon in a medium
- weafq
- · Replies 3 ·
Undergrad Radiation from solid black bodies
- Philip Koeck
- · Replies 14 ·
Undergrad How many spots will a rotating Stern-Gerlach apparatus produce?
- Old Person
- · Replies 32 ·
High School Can objects in nature store light information on the quantum level?
- Maximum7
- · Replies 14 ·
Undergrad Your Favorite Feynman Diagram?
- Devin Powell
- · Replies 3 ·
Undergrad Quantum Hall Effect and Hall Voltage
- Salamon
- · Replies 0 ·
Graduate QFT Superposition of Final States
- masteralien
- · Replies 3 ·
Undergrad Subtractive mode intensity interferometry?
- Swamp Thing
- · Replies 0 ·
Undergrad Electron counterpart of pseudothermal light source for quantum experiments
- Swamp Thing
- · Replies 0 ·
High School Electron's movement after getting hit by a photon that bounces at 90 degrees
- swnsy05
- · Replies 4 ·
High School Origins of the no-cloning theorem
- martix
- · Replies 6 ·
Undergrad Feedback on Educational Script: What's a particle in QFT?
- norwegian_hobby_sci
- · Replies 5 ·
Undergrad Are Superposition, the Uncertainty Principle, and Duality the same?
- eow
- · Replies 12 ·
Graduate Vacuum Energy from Correlation Functions
- masteralien
- · Replies 7 ·
Undergrad How Do Quantum Fluctuations Shape Cosmic Structures?
- Leandro Bolonini
- · Replies 2 ·
Undergrad About nature of superposition of states
- HighPhy
- · Replies 124 ·
Undergrad Infinite momentum is impossible, boundary term in integration by parts
- George Keeling
- · Replies 24 ·
Undergrad Is the Black Hole Information Paradox Truly Resolved?
- KleinMoretti
- · Replies 5 ·
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 Double Slit Experiment: Dumb question that needs to be asked
- 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 ·