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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.

Quantum Interpretations and Foundations

Graduate Understanding Barandes' microscopic theory of causality
High School Is it possible to measure both position and momentum simultaneously?
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Undergrad Does a particle's mass fluctuate.
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Undergrad Symmetry and two electron wave function
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Graduate Wave-packet in configuration space
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Graduate What’s the meaning of decay rate in optical Bloch equations?
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Graduate Relation between the density matrix and the annihilation operator
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Undergrad Fourier Transform of Photon Emission Hamiltonian
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Undergrad Identity involving exponential of operators
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Undergrad Superposition of different spins
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Undergrad Why is there an additional prefactor in equation (12.52) of Peskin's QFT book?
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Undergrad Where is the mass of a particle located?
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Undergrad Weakly interacting electrons in an atom
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Undergrad Black Hole Information path described in new article
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Undergrad Non-Commutation Property and its Relation to the Real World
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High School Quantum entanglement and hidden variables
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High School What do these wavenumbers correspond to in Raman spectroscopy?
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Undergrad Ballentine Equation 5.13 on conservation of momentum
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Graduate Von Neumann's uniqueness theorem (CCR representations)
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Undergrad Does an electron have a quantum phase frequency?
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Undergrad Prefactor in Canonical Quantization of Scalar Field
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Undergrad Momentum eigenfunctions in an infinite well
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Undergrad Potential energy of spin anti-alignment
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High School Does anything happen in the quantum world?
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Graduate Quantum analog of Boltzmann entropy?
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High School How to show that particle spin includes angular momentum?
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Graduate Momentum operator -- Why do we use the plane wave solution?
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Undergrad QED Renormalization Counterterm Confusion
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High School What are the energy eigenvalues of a harmonic oscillator?
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Undergrad Interaction of EM radiation with Glass
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Undergrad Mach-Zehnder interferometer, but with an entangled beam?
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Undergrad What is the relation between the Dirac equation and QED?
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Undergrad What happens when circular polarization meets a diagonal polarizer?
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Undergrad Repeated measurements on a quantum system interacting with other quantum systems
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Graduate How to derive Quantum Mechanics in curved physical space?
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High School Is a Spin 2 Particle the Key to Understanding Gravitation in Quantum Mechanics?
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Graduate Multiparticle Relativistic Quantum Mechanics in an external potential
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Undergrad Can Quantum Effects Prevent Reaching Absolute Zero?
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Undergrad Measurement of a superposition and Born's rule
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Undergrad What is the true nature of microscopic particles when not interacting?
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Graduate Symmetries of particle interacting with external fields (Ballentine)
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Graduate Ballentine on construction of the (Galilean) symmetry generators
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Undergrad Dot product of two vector operators in unusual coordinates
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Undergrad Schwinger-Dyson equations derivation
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Graduate Learning DFT: Inhomogeneous Electron Gas (Hohenberg) Question
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Undergrad Finding ##\partial^\mu\phi## for a squeezed state in QFT
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Undergrad Free particle probability distribution
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Undergrad States of equal energy are equally probable
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Undergrad Diffraction of Matter: Examining Bohr's Theory
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High School Is there a fractional frequency of light?
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Undergrad Limit of quantum mechanics as h -> 0
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Graduate Schrodinger equation in quantum field theory
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Undergrad Derivation of two-electron density operator
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Undergrad Integration of Bessel function products (J_1(x)^2/xdx)
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Undergrad Angular momentum and rotations
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High School Electrons at Absolute Zero -- do they still move?
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Graduate Found a new formula of Dirac calculus
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Graduate Eigenvalue Problem of Quantum Mechanics
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Undergrad The clarity of Heisenberg uncertainty
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Undergrad Approach to extrapolate a "superpositioned" wave?
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Graduate What is meant when a phase is said to have "symmetry protected"?
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Undergrad Unruh, Haag et al.: No Room for Particles in Quantum Field Theory?
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Undergrad How to define expectation value in relativistic quantum mechanics?
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Undergrad Why is quantum mechanics not valid for large objects?
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Undergrad Observer effect in the Dual Slit experiment
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Undergrad How does EM wave geometrical attenuation affect atomic absorption?
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Graduate The eigenvalue power method for quantum problems
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High School Quantum Connection vs Entanglement: What's the Difference?
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High School What is the difference between a wave and a field?
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Undergrad The electron as a smeared charge density
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Undergrad Symbol meaning in CP-violating angle
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Undergrad Do atoms recoil when emitting a photon?
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Undergrad How certain is the uncertainty principle?
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Graduate Solving the Radial Equation for the Dirac Hydrogen Atom Solution
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Undergrad Is Brownian motion a purely classical phenomenon or is it also quantm?
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High School Spin And Angular Momentum of Large Objects
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Undergrad Two hydrogen atoms and Pauli's exclusion principle
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Undergrad Understanding tensor product and direct sum
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Graduate Can four electrons form a completely antisymmetric joint spin WF？
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Graduate Heavy Quark Propagators in HQET
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Graduate Scalar decay to one-loop in Yukawa interaction
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Undergrad Does there exist momentum-shift operator?
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Undergrad Finite Well Problem: Can Energy Be Equal to V0?
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High School Delayed choice experiment and FTL communication
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Undergrad Construction of an Entangled Photon Source
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Graduate Ballentine on the "multicomponent state function"
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Graduate Ballentine on Diffraction Scattering
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Undergrad A very basic question about bra-kets
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Undergrad Parameter Integration of Bubble Integral
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Undergrad Velocity operator, its expression and eigenvalues
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Graduate Understanding time translations in Ballentine
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Undergrad How can multiple entangled Qubits be represented and visualized?
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Undergrad QFT vs GR Cosmological Constant
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Undergrad What are the units of the squeezing parameter?
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Undergrad (extended) Page-Wootters formalism
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Graduate Decoherence in the Heisenberg Picture
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High School What is a photon's structure composed of?
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High School Is the photon a gauge boson for neutrinos?
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High School Does DCQE show a shift between the two "which path" results?
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Graduate Heisenberg picture and Path integrals (Zee QFT)
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High School Are electrons in atoms always in eigenstates?
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