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 How Does a Photon Interfere in an Experiment with Less Than One Photon?
- Grelbr42
- · Replies 14 ·
High School Device that detects if someone is looking at the device?
- Syamsu
- · Replies 23 ·
Undergrad Instability of hydrogen ground state if the time-reversal operator is unitary
- ergospherical
- · Replies 2 ·
High School Examples of less popular pairs of physical properties with uncertainty (HUP)
- syfry
- · Replies 12 ·
Graduate Real vs complex spherical harmonics for hexagonal symmetry
- Junaidjami
- · Replies 2 ·
Undergrad Hossenfelder: Delayed Choice Quantum Eraser, Debunked?
- Halc
- · Replies 3 ·
Undergrad Can Operators Have Multiple Partial Derivatives in Quantum Mechanics?
- Happiness
- · Replies 7 ·
Undergrad Fermi energy for a Fermion gas with a multiplicity function ##g_n##
- phos19
- · Replies 1 ·
Undergrad Physical meaning of two independent, non-interacting parts
- vibhuav
- · Replies 3 ·
Undergrad What do you need to establish that spin is conserved?
- Old Person
- · Replies 3 ·
Graduate Relativistically invariant 2-body phase space integral
- George Wu
- · Replies 3 ·
Undergrad Spin operator and spin quantum number give different values, why?
- 43arcsec
- · Replies 12 ·
Graduate What is the biggest problem to be solved in Quantum Physics in 2023?
- ThiagoMNobrega
- · Replies 48 ·
High School Bell inequality test without polarisation?
- lukephysics
- · Replies 8 ·
Undergrad Questions about Grover's algorithm for quantum searches
- LLSM
- · Replies 6 ·
Graduate What is a spatial wavefunction in QFT?
- George Wu
- · Replies 4 ·
Undergrad Average magnetic moment of atom in magnetic field ##B##
- ergospherical
- · Replies 1 ·
Undergrad Quantum decoherence and the emergence of space/time and gravity
- shunyadragonvv
- · Replies 17 ·
Graduate Entanglement swapping with different measurement directions
- Heidi
- · Replies 4 ·
Undergrad Photoelectric effect: Saturation voltage
- mgcgian
- · Replies 4 ·
Undergrad Is the Archimedes Experiment a groundbreaking test of the Casimir Effect?
- hyksos
- · Replies 10 ·
Undergrad Quantum Mechanics as a Probabilistic forecast of reality
- physwiz222
- · Replies 21 ·
Undergrad Generation of polarization-squeezed beams
- James2018
- · Replies 2 ·
Graduate Do Time-ordering and Time Integrals commute? Peskin(4.22)(4.31)(4.44)
- George Wu
- · Replies 3 ·
Undergrad Hidden phase in polarization tests of Bell's inequality?
- Leureka
- · Replies 49 ·
Undergrad Can intuitionist mathematics be compatible with special and general relativity?
- lektroon
- · Replies 7 ·
Undergrad Biphoton: Existence of layered or multiple entanglements
- Revolucien
- · Replies 5 ·
Undergrad Understanding Scattered Radiation in Photon Beams
- eneacasucci
- · Replies 8 ·
Undergrad Why do these terms vanish when applying Euler-Lagrange to the Dirac Lagrangian?
- JohnH
- · Replies 1 ·
Undergrad Showing that operators follow SU(2) algebra
- graviton_10
- · Replies 2 ·
Undergrad Proportionality between electron mass and chirality flip frequency
- Sagittarius A-Star
- · Replies 1 ·
Undergrad The Potential of Back-to-Back Photons: an Experiment
- Grelbr42
- · Replies 4 ·
Undergrad Noise Proportional to Square Root of Illumination: Need Formula Help
- Joseffina
- · Replies 0 ·
Undergrad Do black holes destroy quantum states?
- Halc
- · Replies 4 ·
Graduate How can gauge fields be associated with real particles?
- Pradyuman
- · Replies 13 ·
Undergrad Quantum Entanglement and Parallel Worlds/Existence
- giodude
- · Replies 7 ·
Undergrad Principles of Quantum Mechanics - Hans C. Ohanian - 0137127952
- hachi44
- · Replies 3 ·
Graduate Bound states of an electron trapped in a dipole field
- reterty
- · Replies 1 ·
High School Entanglement inside a black hole
- Kostik
- · Replies 14 ·
Undergrad ##Tr([Q,P])## and Ballentine Problem 6.3
- EE18
- · Replies 31 ·
High School Are Photons Real? New Study Challenges Assumptions
- log0
- · Replies 17 ·
High School What exactly is spin? Does the standard model work without spin?
- DomDominate
- · Replies 27 ·
High School Quantum Computers and their special properties?
- LightningInAJar
- · Replies 4 ·
Graduate Why Unitary Evolution? QM Justification Ideas
- LittleSchwinger
- · Replies 63 ·
Graduate Main Theorem of Renormalization, but in physicist-speak
- AndreasC
- · Replies 10 ·
Undergrad Kallen-Lehmann representation in gauge theories
- AndreasC
- · Replies 15 ·
Undergrad Dirac Notation for Operators: Ambiguity in Expectation Values?
- dyn
- · Replies 5 ·
High School Do excited electrons move further from the nucleus?
- Mustafa Bayram
- · Replies 2 ·
Undergrad Ways of measuring open quantum systems
- Couchyam
- · Replies 1 ·
Graduate Can entanglement be detected in a single Bell pair?
- DrChinese
- · Replies 1 ·
Undergrad Necessity of the field viewpoint
- simonjech
- · Replies 5 ·
Undergrad Noether currents for a complex scalar field and a Fermion field
- Sandglass
- · Replies 3 ·
Undergrad How to add time variation to a Schrodinger operator?
- snoopies622
- · Replies 11 ·
Undergrad Propagator of massless Weyl field
- Siupa
- · Replies 10 ·
Graduate How to measure the two-photon detuning in 3-level system?
- wangvivi
- · Replies 2 ·
Undergrad Translating the harmonic oscillator
- ergospherical
- · Replies 2 ·
High School How can hybridization and quantum entanglement coexist?
- LilandB
- · Replies 7 ·
Undergrad Finding Eigenvectors of 2-state system
- Kekeedme
- · Replies 7 ·
Graduate Numerical method to Lippman-Schwinger equation
- HadronPhysics
- · Replies 1 ·
High School Atom energy band formation and electron allotment
- Clueless123
- · Replies 5 ·
Undergrad Rewriting of Gibbs Free Energy in Peksin (Equations 13.35/13.36)
- thatboi
- · Replies 12 ·
Undergrad Classic 'Double-Slit' Experiment Using Time Instead of Space
- sbrothy
- · Replies 3 ·
High School Quantum entanglement and simultaneity
- Freixas
- · Replies 4 ·
High School Is it possible to measure both position and momentum simultaneously?
- Clueless123
- · Replies 13 ·
Undergrad Does a particle's mass fluctuate.
- maximdogger
- · Replies 10 ·
Undergrad Symmetry and two electron wave function
- hokhani
- · Replies 7 ·
Graduate Wave-packet in configuration space
- Pradyuman
- · Replies 1 ·
Graduate What’s the meaning of decay rate in optical Bloch equations?
- wangvivi
- · Replies 1 ·
Graduate Relation between the density matrix and the annihilation operator
- richard_andy
- · Replies 0 ·
Undergrad Fourier Transform of Photon Emission Hamiltonian
- thatboi
- · Replies 4 ·
Undergrad Identity involving exponential of operators
- thatboi
- · Replies 2 ·
Undergrad Superposition of different spins
- Isaac0427
- · Replies 15 ·
Undergrad Why is there an additional prefactor in equation (12.52) of Peskin's QFT book?
- thatboi
- · Replies 0 ·
Undergrad Where is the mass of a particle located?
- HansH
- · Replies 21 ·
Undergrad Weakly interacting electrons in an atom
- Isaac0427
- · Replies 2 ·
Undergrad Black Hole Information path described in new article
- .Scott
- · Replies 0 ·
Undergrad Non-Commutation Property and its Relation to the Real World
- expos4ever
- · Replies 19 ·
High School Quantum entanglement and hidden variables
- PainterGuy
- · Replies 7 ·
High School What do these wavenumbers correspond to in Raman spectroscopy?
- Lotto
- · Replies 5 ·
Undergrad Ballentine Equation 5.13 on conservation of momentum
- EE18
- · Replies 3 ·
Graduate Von Neumann's uniqueness theorem (CCR representations)
- Heidi
- · Replies 9 ·
Undergrad Does an electron have a quantum phase frequency?
- H_A_Landman
- · Replies 36 ·
Undergrad Prefactor in Canonical Quantization of Scalar Field
- thatboi
- · Replies 4 ·
Undergrad Momentum eigenfunctions in an infinite well
- dyn
- · Replies 31 ·
Undergrad Potential energy of spin anti-alignment
- Sky Darmos
- · Replies 14 ·
High School Does anything happen in the quantum world?
- DiamondHead
- · Replies 12 ·
Graduate Quantum analog of Boltzmann entropy?
- Demystifier
- · Replies 43 ·
High School How to show that particle spin includes angular momentum?
- snoopies622
- · Replies 14 ·
Graduate Momentum operator -- Why do we use the plane wave solution?
- zb23
- · Replies 8 ·
Undergrad QED Renormalization Counterterm Confusion
- thatboi
- · Replies 6 ·
High School What are the energy eigenvalues of a harmonic oscillator?
- Lotto
- · Replies 2 ·
Undergrad Interaction of EM radiation with Glass
- Jimmy87
- · Replies 14 ·
Undergrad Mach-Zehnder interferometer, but with an entangled beam?
- Marilyn67
- · Replies 33 ·
Undergrad What is the relation between the Dirac equation and QED?
- thaiqi
- · Replies 7 ·
Undergrad What happens when circular polarization meets a diagonal polarizer?
- fluidfcs
- · Replies 20 ·
Undergrad Repeated measurements on a quantum system interacting with other quantum systems
- accdd
- · Replies 3 ·
Graduate How to derive Quantum Mechanics in curved physical space?
- victorvmotti
- · Replies 6 ·
High School Is a Spin 2 Particle the Key to Understanding Gravitation in Quantum Mechanics?
- Omega0
- · Replies 26 ·
Graduate Multiparticle Relativistic Quantum Mechanics in an external potential
- curious_mind
- · Replies 22 ·
Undergrad Can Quantum Effects Prevent Reaching Absolute Zero?
- nomadreid
- · Replies 3 ·