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 Struggling with one step to show quantum operator equality
- troglodyte
- · Replies 2 ·
Graduate Ground state energy of a particle-in-a-box in coordinate scaling
- hilbert2
- · Replies 4 ·
Graduate What is the cause of radioactive decay?
- Dukon
- · Replies 4 ·
Undergrad Why does a non-convergent operator series create a paradox in Shankar's exercise?
- Nitram
- · Replies 14 ·
Undergrad What happened to the spatial degrees of freedom for the second particle?
- sophiatev
- · Replies 1 ·
Undergrad Does a quantum laser pointer show the double-slit experiment?
- Benplace
- · Replies 2 ·
Undergrad QED on electromagnetic interactions in atoms
- WWCY
- · Replies 9 ·
Undergrad Is it possible for non-spherical atomic orbitals to have spherical symmetry?
- hokhani
- · Replies 8 ·
Graduate Contribution of vacuum fluctuation to the self-energy of the electron
- yztsz
- · Replies 1 ·
Graduate Hartle-Hawking sum over all possible metrics?
- Suekdccia
- · Replies 1 ·
Undergrad Measuring all three spin components simultaneously
- Mr J
- · Replies 1 ·
Undergrad Understanding how to get the unpolarized cross-sections
- JD_PM
- · Replies 5 ·
Undergrad Maximum violation of Bell's Inequalities?
- john taylor
- · Replies 7 ·
Graduate Can Quantum Mechanics Calculate the Frequency of an Atomic Clock?
- Bruce Harvey
- · Replies 4 ·
High School Bell's theorem, QFT, and the Relativity of Simultaneity
- Lynch101
- · Replies 64 ·
Graduate Quantum Period is Compression Robust
- Botsina
- · Replies 1 ·
Graduate Positive polarity of a retarded Green's function's imaginary part
- gonadas91
- · Replies 7 ·
Undergrad Seeking better explanation of some quantum stats formulae
- SamRoss
- · Replies 3 ·
Graduate Question: Unambiguous discrimination between two non-orthogonal states
- PabloArteaga
- · Replies 4 ·
Undergrad Feynman's Lectures volume III (Ch:8) -- Resolution of vector states
- Ishika_96_sparkles
- · Replies 4 ·
Undergrad Partition function of quantum mechanics
- PGaccount
- · Replies 2 ·
Undergrad Clebsch–Gordan coefficients: An Identity
- victor01
- · Replies 3 ·
High School Can replaced electrons with copied properties show interference?
- borib
- · Replies 5 ·
Undergrad Probability of finding a particle in a 1-D box max. at centre?
- Apashanka
- · Replies 1 ·
High School What happens when a photon reflects in a gap smaller than its wavelength?
- Elbraido
- · Replies 4 ·
Undergrad Quantum Field Operators for Bosons
- knowwhatyoudontknow
- · Replies 4 ·
High School Notation <x|s> in Feynman Lectures III 3-1: inner product or Green function?
- anuttarasammyak
- · Replies 2 ·
High School Why are protons allowed in the nucleus?
- Andrew Wright
- · Replies 32 ·
High School Uncertainty versus impossibility of measurement
- SamRoss
- · Replies 48 ·
Undergrad Can the spin cause the collapse?
- forofo
- · Replies 1 ·
Graduate Should tensor sum be used in matrix mechanics?
- jk22
- · Replies 5 ·
Undergrad Many-worlds simulation program in C#
- ShadownightPrograms
- · Replies 5 ·
Undergrad Invariance of a system under symmetry operations
- sophiatev
- · Replies 14 ·
High School Virtual Particles are not Dark Matter?
- HexHammer
- · Replies 9 ·
Undergrad Why eigenstates of L² aren't eigenstates of Lx
- Apashanka
- · Replies 14 ·
Graduate Understanding how to derive the differential cross-section formula
- JD_PM
- · Replies 11 ·
Undergrad The period-finding circuit for Shor's algorithm
- tomdodd4598
- · Replies 3 ·
High School What Is the Occurrence Rate of Path Integral in a Photon Double-Slit Experiment?
- HexHammer
- · Replies 6 ·
Graduate Off-diagonal elements in a density matrix
- CarvalhoGD
- · Replies 1 ·
Graduate Relation between Dirac's equation density matrix and current with spin
- forofo
- · Replies 1 ·
Insights Clarifying Common Issues with Indistinguishable Particles
- A. Neumaier
- · Replies 17 ·
Undergrad Fermi's Golden Rule and the S-matrix
- tomdodd4598
- · Replies 5 ·
Undergrad Could Planck-Einstein relation be applied to matter waves?
- Haorong Wu
- · Replies 4 ·
Graduate Zero-point Energy Contribution Below the Planck energy cutoff
- InconspicuousUnicorn
- · Replies 1 ·
Undergrad Relating photon polarization vectors to helicity eigenstates
- PeroK
- · Replies 9 ·
Undergrad Could Quantum Physics explain the singularity in a Black Hole?
- zuz
- · Replies 6 ·
Graduate 30-day Topological Quantum challenge
- Replusz
- · Replies 2 ·
High School Question about squares of operators
- etotheipi
- · Replies 17 ·
Undergrad Can we predict Bob's spin measurement if we know Alice's earlier result?
- entropy1
- · Replies 38 ·
Undergrad Photon Interaction with Environment at Long Range
- Another
- · Replies 1 ·
Undergrad Obtaining the Dirac function from field operator commutation
- abivz
- · Replies 2 ·
High School Is Inverse Compton Scattering Related to the Doppler Effect?
- Daniel Petka
- · Replies 7 ·
Undergrad Can atoms absorb photons with energy higher than transition energy?
- Haorong Wu
- · Replies 4 ·
Graduate Could the fields for the particles and forces have the same origin?
- Brad12d3
- · Replies 1 ·
Undergrad QFT - Field operator commutation
- abivz
- · Replies 3 ·
Undergrad Physical meaning of the highest root / weight
- fresh_42
- · Replies 53 ·
Undergrad Making interference fringes visible with a wide laser beam using glass wedges
- Erik Ayer
- · Replies 8 ·
Graduate Quantum Mechanic/wave function/junction condition
- GreenTea09
- · Replies 3 ·
Undergrad Does a photon lose energy passing through double slits?
- Davephaelon
- · Replies 23 ·
Insights Compton scattering of massive and massless particles
- neilparker62
- · Replies 1 ·
Undergrad Perturbation Theory and Zeeman Splitting
- aliens123
- · Replies 14 ·
Undergrad Visualising an alternative formulation of Planck's Radiation Law
- TheBigDig
- · Replies 8 ·
Graduate Exclusion principle in Helium 3
- EternalStudent
- · Replies 9 ·
High School Mapping between rules of classical vs QM probability?
- etotheipi
- · Replies 6 ·
Undergrad Why is the observer effect not just an experimental limitation?
- TJonline
- · Replies 19 ·
Undergrad How are quantum properties harnessed to solve computational problems?
- expos4ever
- · Replies 8 ·
Graduate Steps from equation 3 to equation 4 in quantum field theory
- Adwit
- · Replies 4 ·
Graduate Quantum physics and the theory of evolution
- Adib Jihad
- · Replies 2 ·
Graduate Phonons as a quasiparticles in a quantum LHO
- LagrangeEuler
- · Replies 29 ·
Undergrad Why is the term "fluctuations" objectionable?
- nomadreid
- · Replies 11 ·
Graduate Fluctuation in terms of Hilbert space formalsm
- cyberkatru
- · Replies 1 ·
Undergrad Why does my derivation give E = ½hω instead of E = hω?
- SpaceNerdz
- · Replies 3 ·
Undergrad How does entanglement avoid causality violation across reference frames?
- pixel
- · Replies 11 ·
Undergrad Parametric down-conversion and double-slits
- rodd
- · Replies 1 ·
Undergrad Negative Energy -- Are QI/QEI's Real?
- cgreeleybsu
- · Replies 11 ·
Undergrad Lithium Atom Ground State Radial Wavefunction
- bob012345
- · Replies 28 ·
Undergrad Is Chemistry the same everywhere?
- .Scott
- · Replies 3 ·
High School How much math is required to do QM?
- entropy1
- · Replies 19 ·
Graduate Zero overlap between two-meson state and final state in meson decay
- JD_PM
- · Replies 10 ·
Graduate Why do different regularization schemes give different answers?
- QFT1995
- · Replies 5 ·
High School How can the annihilation operator for photons be realized experimentally?
- jeremyfiennes
- · Replies 33 ·
Undergrad Is it possible to explain Quantum tunneling with the HUP?
- Nam Jeong Woo
- · Replies 3 ·
Graduate Why Is the Path Integral W[J] a Vacuum-to-Vacuum Amplitude?
- PGaccount
- · Replies 4 ·
Undergrad Why do potential well boundaries use different inequality signs?
- DrinkanDerive
- · Replies 3 ·
Undergrad Number of qubits required for Shor's algorithm to factor a number < 2^n
- tomdodd4598
- · Replies 2 ·
Undergrad Thermal photons emission inside a material
- Johnny5454
- · Replies 3 ·
Undergrad Vertex function, quantum action
- The black vegetable
- · Replies 2 ·
Undergrad Finding matrices of perturbation using creation/annihilation operators
- Keru
- · Replies 3 ·
High School Measuring entangled photons in different polarization bases
- StevieTNZ
- · Replies 3 ·
Graduate Bremsstrahlung single photon or spectrum
- gjj
- · Replies 1 ·
Undergrad Accuracy of the Density of States
- JohnnyGui
- · Replies 3 ·
Graduate Coherent states: Orthonormal set? Overcomplete basis?
- LagrangeEuler
- · Replies 1 ·
High School Ionization energy and energy levels
- ilovepudding
- · Replies 11 ·
Undergrad Group Theory Appearing in Griffith's Elementary Particles (2nd Ed.)
- Jdeloz828
- · Replies 20 ·
Graduate How ‘spooky’ is quantum physics? The answer could be incalculable
- Demystifier
- · Replies 24 ·
Undergrad Why perturbation theory uses power series?
- Phylosopher
- · Replies 13 ·
Undergrad Splitting of a one-particle wave function
- Spacetime walker
- · Replies 15 ·
Graduate Why is the quantum Fisher information useful in quantum metrology?
- jamie.j1989
- · Replies 1 ·
High School What's the exact point about time travel?
- Benjamin_harsh
- · Replies 6 ·
Undergrad (Baby QM) Analytic Solution to the Infinite Square Well Problem
- obstinatus
- · Replies 2 ·