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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Graduate Decoupled spin vectors A and B
- filip97
- · Replies 1 ·
Graduate How are basis vector relationships defined in incompatible propositions?
- forkosh
- · Replies 1 ·
Undergrad Nomenclature : global or constant phase
- jk22
- · Replies 3 ·
Undergrad Fermi's golden rule derivation a bit hazy
- Replusz
- · Replies 4 ·
High School Quantum computing -- How is the relevant solution selected?
- jeremyfiennes
- · Replies 4 ·
Graduate Does Adding or Removing an Electron Change a Helium-3 Atom to a Boson?
- hilbert2
- · Replies 14 ·
Graduate Product of Representations of Lorentz Group
- filip97
- · Replies 1 ·
Graduate Superluminal origin of Quantum Mechanics
- andresB
- · Replies 4 ·
Undergrad Thought experiment on photon entanglement
- Steve Blandford
- · Replies 14 ·
Undergrad Vacuum amplitudes in \phi^4 theory
- Replusz
- · Replies 6 ·
Undergrad Why does a superposition of z-spin states give definite x-spin?
- Sparky_
- · Replies 32 ·
Undergrad Commutator with gradient operator (nabla)
- Replusz
- · Replies 4 ·
Graduate Algebraic form of Klein Gordon ##\phi^4## vacuum and ladder operators
- QFT1995
- · Replies 5 ·
Undergrad Creation/annihilation operators question
- Antarres
- · Replies 5 ·
Undergrad What are time crystals and what are they made of?
- Quark Effect
- · Replies 8 ·
Undergrad Quantum Mechanics Particle in a Box
- umttrb
- · Replies 11 ·
Graduate Looking Under the Hood of Feynman Diagrams
- Jdeloz828
- · Replies 7 ·
Graduate Potential step at a Barrier in Quantum mechanics
- LagrangeEuler
- · Replies 6 ·
High School Are all quantum fields coherent?
- Wave Packets
- · Replies 14 ·
Graduate Finding periodic potentials from Bloch wave functions
- hilbert2
- · Replies 10 ·
Undergrad Do electrons interact with virtual particles at every instant?
- asimov42
- · Replies 10 ·
Undergrad Is the Kronecker Delta Calculation in Peskin and Schroeder's Solution Correct?
- MathematicalPhysicist
- · Replies 6 ·
Undergrad Quantum Measurement under Heisenberg Picture?
- LarryS
- · Replies 8 ·
Graduate Ground state energy of cube-like potential wells
- hilbert2
- · Replies 3 ·
Undergrad Why are particles off-shell in external fields?
- asimov42
- · Replies 3 ·
Graduate Validity of Scalar Field Lagrangian with Linear and Quadratic Terms
- Gaussian97
- · Replies 4 ·
Graduate QFT topics for entanglement entropy
- shinobi20
- · Replies 3 ·
Undergrad Wilczek on virtual particle reality and summing Feynman diagrams
- asimov42
- · Replies 13 ·
Undergrad The Dirac Equation: Understanding Spinors and Approximations
- park
- · Replies 3 ·
Undergrad Perturbation lines for the 1s hydrogen electron
- georg gill
- · Replies 10 ·
Undergrad Time measurement in a double slit experiment with single photons
- Marcin
- · Replies 48 ·
High School From radio signal to corresponding photons
- somega
- · Replies 1 ·
Graduate How to build a qubit (theoretically)?
- WAAAGH
- · Replies 8 ·
Undergrad What is the Fourier conjugate of spin?
- redtree
- · Replies 9 ·
Graduate Understanding Superposition Physically and Mathematically
- jambaugh
- · Replies 2 ·
Undergrad Atoms in a harmonic oscillator and number states
- jamie.j1989
- · Replies 5 ·
Graduate Quantum entanglement and quantum foundation
- kay_bee_93
- · Replies 1 ·
High School Questions about measurement devices in the double slit experiment
- UnderstandingQT
- · Replies 10 ·
Undergrad 2nd Order Perturbation Theory Energy Correction
- electrogeek
- · Replies 5 ·
Graduate Commutation between spin-operator and creation operator(QFT)
- retardedgreensfunc
- · Replies 4 ·
Graduate Quantum Information research frontier
- kay_bee_93
- · Replies 2 ·
Undergrad Definition of a Degenerate Subspace (QM)
- CGandC
- · Replies 12 ·
High School How does the double slit experimental apparatus actually work?
- leppad
- · Replies 7 ·
Graduate Double slit experiment with magnetic traps
- Marcin
- · Replies 33 ·
High School Adjoint Operation in Shankar's "Principles of Quantum Mechanics
- Getterdog
- · Replies 13 ·
Undergrad The density of states independent of Boundary Conditions
- dRic2
- · Replies 4 ·
Undergrad Valley degeneracy in tunneling current
- Noki Lee
- · Replies 1 ·
Graduate Effect of Spin on Vacuum Energy
- DrInfinity
- · Replies 25 ·
Undergrad Is there some agreement on properties of a theory of quantum gravity?
- KurtLudwig
- · Replies 2 ·
Undergrad What is an Eigenstate? Simple Explanation
- anni
- · Replies 5 ·
Undergrad When is <psi|AB|theta> equal to <psi|A|theta>*<psi|B|theta>?
- Getterdog
- · Replies 1 ·
Undergrad How Fourier transform and operator methods connect for conjugate variables
- nomadreid
- · Replies 7 ·
High School Why do double Hadamard gates cancel |1> but leave |0> and √2 unchanged?
- Quark Effect
- · Replies 2 ·
Undergrad Relationship between a Lie group such as So(3) and its Lie algebra
- MichaelAlexDavM
- · Replies 6 ·
High School What is the significance of 'i' in quantum computation notation?
- Quark Effect
- · Replies 7 ·
High School Is sunlight through gaps in leaves during an eclipse decohered?
- quantuminternet
- · Replies 4 ·
Undergrad When does the exchange operator commute with the Hamiltonian
- aliens123
- · Replies 13 ·
High School We can't unite QM with GR because of what the Qfield is capable of
- quantuminternet
- · Replies 3 ·
Undergrad Why doesn't an electron bounce in the direction of the incident light?
- cemtu
- · Replies 5 ·
High School How do orthogonal waves interfere?
- Kuribali
- · Replies 6 ·
Undergrad Understanding algorithmic information theory's reality
- sayetsu
- · Replies 2 ·
Graduate Commutation relations of N(k) with creation and annihilation operators in QFT
- JD_PM
- · Replies 10 ·
Graduate Stone's theorem on one-parameter unitary groups and new observables?
- victorvmotti
- · Replies 2 ·
Undergrad Rotation problem in Quantum Mechanics
- Adwit
- · Replies 10 ·
Undergrad Von Neumann entropy for "similar" pvm observables
- forkosh
- · Replies 2 ·
Undergrad Is the potential energy always negative in the ground state of a hydrogen atom?
- LagrangeEuler
- · Replies 12 ·
High School Emission from a coated cathode and tunneling
- Orthoceras
- · Replies 2 ·
Graduate What Conditions Allow the Derivative Trick for Evaluating Fermionic Commutators?
- thetafilippo
- · Replies 4 ·
Graduate How effective can QM be to understand the mind and/or consciousness?
- SEYED2001
- · Replies 13 ·
Undergrad Question on the SG (Stern-Gerlach) Spin experiment
- arkantos
- · Replies 8 ·
Graduate Learning coherent states beyond Griffiths
- Sunnyocean
- · Replies 11 ·
High School Can we measure any two of the energy, momentum or mass simultaneously?
- SEYED2001
- · Replies 10 ·
Graduate Understanding Hermiticity of Actions in QFT for Checking and Confirming
- John Greger
- · Replies 4 ·
Undergrad Imaginary Residuals in Solving the Schrodinger Equation
- Bob3141592
- · Replies 5 ·
Undergrad Can coherent states reveal classical orbits from quantum orbitals?
- arivero
- · Replies 12 ·
Graduate Lorentz transformation symmetry and angular momentum in QFT
- JD_PM
- · Replies 6 ·
Undergrad Why use antisymmetric tensor to flip Higgs doublet in up-quark coupling
- tomdodd4598
- · Replies 11 ·
Graduate Superficial Degree of Divergence in Renormalization of Phi^3 Theory
- The black vegetable
- · Replies 2 ·
Undergrad How to determine ##\psi(x,0)## in general situation?
- Kim hyeon su
- · Replies 1 ·
Undergrad Scalar Hamiltonian and electromagnetic transitions
- kelly0303
- · Replies 5 ·
Undergrad What does it mean to influence a quantum measurement's outcome?
- entropy1
- · Replies 23 ·
Undergrad Bell's theorem : pre- and post-digitization
- jk22
- · Replies 1 ·
High School What Are the Best References for Delayed Eraser Experiments with Electrons?
- jeremyfiennes
- · Replies 5 ·
High School How can electrons spin if they're waves of energy?
- Henrcr
- · Replies 11 ·
Undergrad Proof of Commutator Operator Identity
- Peter Yu
- · Replies 7 ·
Undergrad Planck's law in wavenumber vs. wavelength
- davidwinth
- · Replies 20 ·
Undergrad What is the name for the Heisenberg uncertainty principle?
- kent davidge
- · Replies 15 ·
Undergrad Significance of the Exchange Operator commuting with the Hamiltonian
- sophiatev
- · Replies 9 ·
Graduate Renormalization Conditions of QED
- Gaussian97
- · Replies 3 ·
High School Where is the quantization term in Planck's Law?
- Taulant Sholla
- · Replies 9 ·
Undergrad Quantum fluctuation and classical physics
- kinchit bihani
- · Replies 7 ·
Graduate Electron frequency components during orbital tunneling
- jhonnyS
- · Replies 2 ·
Graduate Dirac Propagator: Learn to Reach 8.2
- Ayoub Tamin
- · Replies 7 ·
Undergrad Why the statistics for a real gas are not quantum in nature?
- MichPod
- · Replies 5 ·
High School Mach-Zehnder Experiment: Wave-Particle Duality Demonstrated
- jeremyfiennes
- · Replies 11 ·
Undergrad Steering the polarization of entangled photons
- kurt101
- · Replies 4 ·
Undergrad Probability density expansion
- Killtech
- · Replies 5 ·
High School How do quantum computers find a solution?
- ngrunenberg
- · Replies 2 ·
Undergrad A qualitative question about Blackbody Radiation
- Rishabh Narula
- · Replies 3 ·
Undergrad Effect of inserting an analyzer loop in the EPR experiment
- kurt101
- · Replies 3 ·