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 Entanglement and action at a distance -- What coordinate system?
- Martian2020
- · Replies 9 ·
Undergrad Why is quantum entanglement so significant?
- dsaun777
- · Replies 29 ·
Undergrad Delay in signaling between entanglement particles
- danielhaish
- · Replies 7 ·
High School Is an electron beam affected by photons?
- Herbascious J
- · Replies 4 ·
Undergrad Does photon self energy contribute to the speed of light?
- Heidi
- · Replies 2 ·
High School How do atomic clocks work: frequency stability of caesium atoms?
- Martian2020
- · Replies 7 ·
Undergrad What do strings represent in string theory?
- planet-75
- · Replies 2 ·
High School Planck's equation and upper and lower bounds on the energy of a photon
- PainterGuy
- · Replies 8 ·
Undergrad Are Virtual Exchange Particles a Valid Concept in Understanding Remote Forces?
- planet-75
- · Replies 3 ·
High School How do we know that the measurement affects the result?
- danHa
- · Replies 15 ·
Undergrad Completeness relations in a tensor product Hilbert space
- Decimal
- · Replies 13 ·
High School Particle annihilation -- Is it instantaneous?
- dsaun777
- · Replies 10 ·
Undergrad Article on photon wave-particle duality
- physics pfan
- · Replies 9 ·
Undergrad Are electro-magnetic waves the same as the wave function?
- Herbascious J
- · Replies 3 ·
High School Does retrocausality follow from logic?
- entropy1
- · Replies 11 ·
Graduate How useful are quantum-classical hybrid theories?
- andresB
- · Replies 5 ·
Undergrad Potential step and tunneling effect
- Maximilian2
- · Replies 9 ·
Undergrad Interference in double-slit with single photons
- Byron Forbes
- · Replies 17 ·
Undergrad Discreteness of bound vs unbound states
- Mayan Fung
- · Replies 11 ·
Graduate What is a useful way to talk about eigenstates of the position operator
- dudemanguy333
- · Replies 1 ·
Graduate What Does Path Mean in Quantum Mechanics and Quantum Field Theory?
- Antonio Lao
- · Replies 1 ·
Undergrad Can Bell's Theorem Disprove This Density Matrix Representation?
- jk22
- · Replies 3 ·
Graduate Are there two different adjoint representations used in the SM?
- victorvmotti
- · Replies 9 ·
High School Transverse vs longitudinal wave representation in double-slit diagrams
- r731
- · Replies 7 ·
Undergrad The velocity of Pilot-wave and the Double slit experiment
- sha1000
- · Replies 8 ·
Graduate Adjoint representation and spinor field valued in the Lie algebra
- victorvmotti
- · Replies 1 ·
High School Destructive interference and conservation of momentum
- Quantum of Solace
- · Replies 10 ·
High School Quantum eraser and time travel
- black hole 123
- · Replies 10 ·
Undergrad Information content of a qubit
- Sunny Singh
- · Replies 2 ·
Undergrad How do we know that the raising operator only raises the state by one step?
- Mayan Fung
- · Replies 8 ·
Undergrad Separating particles in a zero point energy field
- mrmashy
- · Replies 4 ·
Undergrad Double slit experiment and the Uncertainty Principle
- Axel Togawa
- · Replies 8 ·
Undergrad Fermi gas in relativistic limit
- Mayan Fung
- · Replies 7 ·
Graduate Geometry of matrix Dirac algebra
- bayakiv
- · Replies 15 ·
Undergrad Zero-point energy of the harmonic oscillator
- JTFreitas
- · Replies 9 ·
Undergrad Lyman-##\alpha## Wavelength: Hydrogen's Region in Spectrum
- tryingtolearn1
- · Replies 4 ·
High School Can brain-computer interfaces reveal more about quantum mechanics?
- entropy1
- · Replies 10 ·
Undergrad Doesn't Schrodinger's Cat start to decay?
- saddlestone-man
- · Replies 9 ·
Graduate Propagator from a space-time point to itself
- victorvmotti
- · Replies 6 ·
Undergrad Quantum numbers for energy levels
- TheCelt
- · Replies 12 ·
High School How Do Active and Passive Transformations Differ in Quantum Mechanics?
- etotheipi
- · Replies 1 ·
Undergrad Entanglement and Regions of Space in Vacuum
- expos4ever
- · Replies 1 ·
Undergrad Verifying Speed of Light Varies by Direction
- Andy Lee
- · Replies 6 ·
Undergrad How can a single photon create a diffraction pattern in a microscope?
- Axel Togawa
- · Replies 5 ·
Undergrad Where do wave functions come from?
- joneall
- · Replies 2 ·
Graduate Scattering Amplitudes for Phi 4 Theory
- Diracobama2181
- · Replies 1 ·
Undergrad Two photon polarizations in L&B gauge theory Lagrangian
- joneall
- · Replies 9 ·
Undergrad Are quantum computers required to be cold to reduce Brownian motion?
- iVenky
- · Replies 6 ·
Graduate How can we measure these Hermitian operators?
- Heidi
- · Replies 9 ·
Undergrad Eigenfunctions and wave functions
- semc
- · Replies 7 ·
High School Can a quantum entanglement camera receive images faster than light speed?
- James71
- · Replies 3 ·
Undergrad Bose-Einstein numerical integration
- TeslaPow
- · Replies 22 ·
High School Cold vs hot on the atomic scale
- Fishpig
- · Replies 4 ·
Undergrad Is the Heisenberg-Robertson Uncertainty Relation Always Consistent?
- DuckAmuck
- · Replies 2 ·
Undergrad Is Probability in Quantum States Proportional to Energy Levels?
- bob012345
- · Replies 32 ·
High School Dual slit with controlled electron trajectories
- Buckethead
- · Replies 26 ·
Undergrad Zeno's paradoxes of motion in physics
- Johnny5454
- · Replies 5 ·
Undergrad Information diagram for entangled particles?
- Heidi
- · Replies 26 ·
Undergrad Second Matrices from Spherical Harmonics with Eigenvalue l+1
- paklin2
- · Replies 8 ·
Undergrad Pros and cons of Heisenberg and Schrodinger (and Feynman) pictures?
- AndreasC
- · Replies 11 ·
Undergrad Could an experiment confirm the EPR paradox's implications on uncertainty?
- Buzz Bloom
- · Replies 20 ·
Graduate Using the QM Formalism To Make Predictions
- Morbert
- · Replies 8 ·
Undergrad Why QFT still goes well while it lacks the notion of wave function?
- fxdung
- · Replies 71 ·
High School What happens when a photon has more energy than the level transition gap?
- songoku
- · Replies 6 ·
High School Can it escape the event horizon if the wavelength is long enough?
- Puffer Fish
- · Replies 3 ·
Graduate Upper bound for wavelength of a photon inside an infinite square well
- Kostik
- · Replies 2 ·
High School 1-photon emission possible from electron-positron annihilation?
- Puffer Fish
- · Replies 23 ·
Undergrad Transmission and reflection coefficients for sech² potential scattering
- Robin04
- · Replies 8 ·
Graduate Would it matter which inner product I choose in quantum mechanics?
- patric44
- · Replies 4 ·
Undergrad Is the measurement problem equally as vexing as entanglement?
- bland
- · Replies 16 ·
Undergrad Born rule in classical Ising model: Feynman -> Boltzmann ensemble?
- Jarek 31
- · Replies 2 ·
Undergrad Quantum Mechanics Wave Function in 3D
- Icycub
- · Replies 2 ·
Graduate Is this simple derivation of the uncertainty principle valid?
- patric44
- · Replies 3 ·
Undergrad Solution Expansion of ##A^{\mu}## when ##L \rightarrow \infty##
- JD_PM
- · Replies 3 ·
Undergrad Consequences when a measurement is destroyed?
- Buzz Bloom
- · Replies 11 ·
Insights Causal Perturbation Theory - Comments
- A. Neumaier
- · Replies 108 ·
Undergrad Can Dynamical Systems Explain Electron Behavior in Hydrogen Atoms?
- thaiqi
- · Replies 7 ·
Undergrad Is Stern-Gerlach experiment a proper idealization of measurnment?
- Jarek 31
- · Replies 12 ·
High School 2D-cross-double-slit experiments for understanding quantum world
- davidpeng1749
- · Replies 1 ·
Undergrad Where does this solid angle come from?
- Heidi
- · Replies 1 ·
Graduate Why does equation 35.21 have an extra minus sign?
- sunshine9
- · Replies 1 ·
Undergrad Momentum operator acting to the left
- DuckAmuck
- · Replies 6 ·
Graduate What should be the mathematical way out of QFT's decades stagnation?
- Tendex
- · Replies 26 ·
Undergrad Why quantum wave function collapse is not consider a signal?
- danielhaish
- · Replies 4 ·
High School What causes loss of quantum coherence?
- entropy1
- · Replies 11 ·
Graduate Can Entropy of Two-Level Particles Predict Fringe Visibility?
- Heidi
- · Replies 2 ·
Graduate Where did this term in the path integral come from?
- PORFIRIO I
- · Replies 1 ·
High School Actions of subatomic particles while under observation
- Physics4gangsters
- · Replies 7 ·
Undergrad Why use complex conjugate when multiplying different wave functions
- Icycub
- · Replies 14 ·
Undergrad 2-photon interference question
- Killtech
- · Replies 76 ·
High School Could Quantum Fluctuations exist W/out the presence of Spacetime?
- Vanilla Gorilla
- · Replies 6 ·
Undergrad Q re a photon ionizing a hydrogen atom
- Buzz Bloom
- · Replies 1 ·
Undergrad Quantum Measurements with Gravitational Waves
- lightarrow
- · Replies 48 ·
High School Regarding the coherence of a photon pair decaying from Higgs
- DarkMattrHole
- · Replies 2 ·
Graduate Spin-orbital combination and the exclusion principle
- hokhani
- · Replies 18 ·
Graduate Effective Action for Scalar and Fermion Fields
- The black vegetable
- · Replies 4 ·
Undergrad Understanding Matrix Mechanics in Quantum Mechanics
- Jamister
- · Replies 8 ·
High School Can a Thought Experiment with Dice Challenge Bell Inequalities?
- Johan0001
- · Replies 25 ·
Undergrad Why can't we interprete /x> in relativistic QFT as position eigenfunc?
- fxdung
- · Replies 2 ·
High School How long before someone builds a machine to predict the future?
- Quarinteen
- · Replies 21 ·