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 What's the importance of the squared of the angular momentum?
- annaphys
- · Replies 4 ·
Undergrad What is the significance of 54 volts in the Davidson Germer Experiment?
- Nikhil Rajagopalan
- · Replies 3 ·
High School Entanglement - lack of "symmetry" in no-hidden variables explanation
- mgkii
- · Replies 44 ·
High School Understanding Phase Terminology in Wave Functions
- etotheipi
- · Replies 9 ·
Graduate Quantum biology - photosynthesis
- Amin48
- · Replies 3 ·
High School How does the observed version of the double slit get by without math?
- DamonL
- · Replies 15 ·
Undergrad Entanglement setup that shouldn't allow for the transmission of info
- entropy1
- · Replies 2 ·
Undergrad Commutator's Matrix representation
- Javier2808
- · Replies 11 ·
Undergrad What is the cross section of a graviton?
- KurtLudwig
- · Replies 18 ·
Graduate Annihilation creation operators in case of half H.oscillator
- SUVAM ROY
- · Replies 14 ·
Undergrad Decoupling of angular momentum
- kelly0303
- · Replies 4 ·
Graduate What is the Corrected Heisenberg Limit for Phase Estimation Measurements?
- PeterDonis
- · Replies 3 ·
Undergrad Topological quantum physics - spin statistics
- Replusz
- · Replies 1 ·
High School Where do virtual particles come from?
- Fiziqs
- · Replies 9 ·
Undergrad Why Does Equation (5) in Bell's Paper Use < σ⋅a > = 1 - 2θ'/π?
- quiteconfused
- · Replies 2 ·
Undergrad Will thermal disturbance change an atom's spin?
- univector
- · Replies 5 ·
Undergrad Vector addition in spin orbit coupling
- kelly0303
- · Replies 7 ·
Undergrad Why Won't Observation in a 2 Slit Experiment Cause 1 Slit Diffraction?
- Flamel
- · Replies 39 ·
Undergrad Why do we observe an electron both as a wave and as a particle ?
- Leonardo Bittar
- · Replies 3 ·
High School Multiple Sequential Delayed Choice Experiment
- knightwing
- · Replies 5 ·
Graduate Langevin equation - derivative of random force?
- SchroedingersLion
- · Replies 8 ·
Undergrad Energy of massless particles before electroweak symmetry breaking
- Ranku
- · Replies 2 ·
High School Interesting Book On The History Of QM And Einstein's Role
- bhobba
- · Replies 7 ·
Undergrad How can a photon "stimulate emission" if it really does (Einstein coefficients)
- freetheparticle
- · Replies 11 ·
High School Detecting a photon passing through a slit without destroying it?
- Cato
- · Replies 4 ·
Undergrad Gauge Transformations and the Covariant Derivative
- PeroK
- · Replies 2 ·
Undergrad Does classical mechanics apply to the quantum world at all?
- Galactic explosion
- · Replies 26 ·
Undergrad Use of the Beam Splitter Operator
- BeyondBelief96
- · Replies 4 ·
Undergrad Photon Bell Experiment, what happens in a single case?
- KeesDeVries
- · Replies 4 ·
Undergrad Scatter radiation and film fogging
- Asmaa Mohammad
- · Replies 1 ·
Undergrad Can on-shell virtual particles appear in Feynman diagrams?
- asimov42
- · Replies 7 ·
Undergrad Is a bipartite system necessary for the proof of the PBR theorem?
- greypilgrim
- · Replies 2 ·
Undergrad What do we do with the massive scalar quantum field in QFT?
- PeroK
- · Replies 15 ·
Undergrad Why induction requires a magnetic material to produce a current
- Wille
- · Replies 7 ·
High School Compton Effect -- Why is the electron considered to initially be at rest?
- Viona
- · Replies 4 ·
Undergrad Physical meaning of ##\psi_1(x)\hat{A}\psi_2(x)##
- amjad-sh
- · Replies 11 ·
Graduate Diagonalization of 2x2 Hermitian matrices using Wigner D-Matrix
- Max1
- · Replies 4 ·
Graduate Two Different Fock State Inputs into a Beam Splitter
- BeyondBelief96
- · Replies 1 ·
Undergrad Why is blackbody radiation continuous while atomic emission is discrete?
- Viona
- · Replies 2 ·
Undergrad How is the information of a change in position of a star transmitted?
- KurtLudwig
- · Replies 2 ·
Graduate When should we use the Langevin equation and when should use Fokker-Planck
- Sciencestd
- · Replies 4 ·
Graduate S-matrix expansion and Wick's theorem
- Gaussian97
- · Replies 1 ·
Undergrad Field Renormalization vs. Interaction Picture
- maline
- · Replies 39 ·
Graduate Photoelectric effect at metal junctions
- technano
- · Replies 4 ·
Graduate Are complex numbers necessary in quantum mechanics?
- Demystifier
- · Replies 219 ·
Undergrad Photon interference and path differences
- kurt101
- · Replies 18 ·
Undergrad Does Bell's theorem imply other Lorentz transformations?
- jk22
- · Replies 13 ·
High School Layman's question re quantum entanglement
- Tom Nicholson
- · Replies 12 ·
Undergrad Momentum-Position vs. Energy-Time Uncertainty Relations
- Logic314
- · Replies 10 ·
Graduate What did Hans Bethe think of von Neumann's quantum logic?
- Suekdccia
- · Replies 1 ·
Undergrad Why do electrons emit light when solids are heated to glowing?
- Wille
- · Replies 11 ·
Graduate Understanding Harmonic oscillator conventions
- Djawu
- · Replies 6 ·
Undergrad What Is the Physical Meaning of Atomic Particle 'Spin'?
- cmb
- · Replies 15 ·
Undergrad Collapse of the wave function under simultaneous measurement
- Philippe H
- · Replies 2 ·
High School Quantum mechanical model of an atom
- Frigus
- · Replies 7 ·
Undergrad Master` Equation for the Penrose-Diosi wavefunction collapse
- Agrippa
- · Replies 2 ·
Undergrad Photon occupation numbers in relation to the 4-potential
- olgerm
- · Replies 26 ·
Undergrad What is SR transformarion for bispinor?
- olgerm
- · Replies 49 ·
Undergrad General Implications of the Double-Slit Experiment
- lifeonmercury
- · Replies 1 ·
High School The Virtue of Individual Perception RE: Wavefunction Collapse
- Denselight93
- · Replies 2 ·
Undergrad Let me Know What you Think of This Toy Theory
- KyleSingh
- · Replies 3 ·
Undergrad Is the energy of a burst of light the sum of the energy of each photon?
- Aaron121
- · Replies 28 ·
Undergrad Trying to Generate Entangled Photons
- Strange_matter
- · Replies 6 ·
Graduate Unitary representations of Lie group from Lie algebra
- leo.
- · Replies 5 ·
Undergrad Calculating group representation matrices from basis vector/function
- pellis
- · Replies 6 ·
High School How does measuring particle A affect particle B in entanglement?
- Andyhs
- · Replies 11 ·
Graduate The cnot with outer product control qubit
- Galaxion
- · Replies 1 ·
Undergrad How Would Afshar's Experiment Affect Entanglement?
- Erik Ayer
- · Replies 2 ·
Undergrad Exclusion principle and the distance between two particles
- dRic2
- · Replies 3 ·
Undergrad Polarization and Stimulated Emission
- Erik Ayer
- · Replies 20 ·
Undergrad Is a Particle Simply the Manifested Kinetic Energy of Its Quantum Field?
- Tiptoeingelephants
- · Replies 2 ·
Undergrad Minimum number of cycles in a short pulse laser
- Uchida
- · Replies 6 ·
Graduate Dirac Field quantization and anti-commutator relation
- sakh1012
- · Replies 1 ·
Undergrad Is there a reason eigenvalues of operators correspond to measurements?
- gsingh2011
- · Replies 2 ·
Undergrad The HOM Effect, Path Entanglement, and Generation
- Erik Ayer
- · Replies 5 ·
Undergrad Dispersive approximation (limit) in the Jaynes-Cummings Model
- thephysicsboy1998
- · Replies 1 ·
Graduate Hermitian operators and matrices in quantum mechanics
- Greg Bernhardt
- · Replies 1 ·
Graduate Definition of Expectation Value (EV)
- Greg Bernhardt
- · Replies 1 ·
Undergrad Hamiltonian Commutation Question
- Diracobama2181
- · Replies 6 ·
High School Is Bell's inequality Lorentz invariant?
- jk22
- · Replies 2 ·
High School Notion of a zero dimensional point particle?
- Nickyv2423
- · Replies 4 ·
Graduate First Chip-to-Chip Quantum Teleportation
- Tom.G
- · Replies 3 ·
Graduate Does Dim Reg really avoid a photon mass?
- maline
- · Replies 10 ·
High School Backscattering of photons in dim = 1
- Heidi
- · Replies 3 ·
Undergrad Why doesn't rank 1 tensor acting on spin-1/2 produce rank 3/2 terms?
- Malamala
- · Replies 2 ·
High School Neutron Decay Outside of a Nucleus Near Absolute Zero
- Chris Nimmons
- · Replies 3 ·
Graduate Measurements of multipartite entanglement
- Danny Boy
- · Replies 1 ·
Undergrad Imagining the EPR paradox/quantum entanglement
- tommmyyyy
- · Replies 6 ·
Undergrad Entanglement after measurement
- nomadreid
- · Replies 16 ·
Undergrad The construction of particles in QFT
- ilper
- · Replies 70 ·
Graduate Trace of a product of Dirac Matrices in a Fermion loop
- RicardoMP
- · Replies 5 ·
Undergrad How does a quantum computer work?
- Johnny5454
- · Replies 7 ·
Undergrad How do momentum eigenstates have the form e^(2πix) and relate to conservation?
- Zala Jaydevsinh
- · Replies 1 ·
Undergrad Why Do We Have The Effect Of Spontaneous Emission And Absorption
- bhobba
- · Replies 2 ·
Undergrad What are the degrees of freedom of a quark?
- stephen weber
- · Replies 14 ·
Undergrad Wave function of a laser beam?
- DEvens
- · Replies 6 ·
High School Do photons bunch up at an interface? Can they lase (laze?)
- ImaO
- · Replies 17 ·
Undergrad Can a simulation hypothesis simulate quantum physics?
- Endypanzer
- · Replies 10 ·
Undergrad Simulation Hypothesis: Quantum Computer Modeling
- Johnny5454
- · Replies 2 ·
Graduate Vacuum energy density after spontaneous symmetry breaking
- Geonaut
- · Replies 5 ·