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 Can there be multiple ground states?
- marc32123
- · Replies 1 ·
Graduate How are atoms not in superposition if the electrons are
- batmanandjoker
- · Replies 10 ·
Graduate Commutators, mutual eigenkets, and observables
- unscientific
- · Replies 7 ·
Undergrad Less than one photon, what does it mean?
- suma
- · Replies 6 ·
Graduate Left hand side of the Schrödinger equation
- mpv_plate
- · Replies 16 ·
Graduate Why is a massless spin-2 automatically a graviton
- Sonderval
- · Replies 21 ·
Graduate Transition Rates / Squared Dirac Delta
- MisterX
- · Replies 2 ·
Graduate Recommended Books for Beginners in Particle Physics
- Moeen
- · Replies 3 ·
Graduate What state do we have if we don't know if a measurement was performed?
- greypilgrim
- · Replies 20 ·
Graduate Matrix Elements: LHO & Dirac Notation
- LagrangeEuler
- · Replies 2 ·
Graduate Phonons: For oscillator wave function
- LagrangeEuler
- · Replies 12 ·
Graduate Klein Paradox - Dirac equation with step potentional
- Drew Carey
- · Replies 1 ·
Graduate Why do bound systems have less rest mass than the sum of its parts?
- dimwatt
- · Replies 5 ·
Graduate Is the Stern-Gerlach experiment sufficient?
- intervoxel
- · Replies 4 ·
Graduate Planck and Maxwell-boltzman distribution
- Entanglement
- · Replies 1 ·
Graduate The Dirac Lagrangian Density: A Brief Overview
- "Don't panic!"
- · Replies 17 ·
Graduate Definition of a Gaussian wave packet for a Initial State
- Gabriel Maia
- · Replies 5 ·
Graduate Passing a black kole from double slit experiment setup
- us40
- · Replies 6 ·
Graduate The one-loop correction in Lehmann-Kallen form
- JILIN
- · Replies 7 ·
Graduate Unitary Operator Inverse Transformation: Solving for a_m
- Hazzattack
- · Replies 14 ·
Graduate Understanding Energy and Frequency in Rotation Spectra
- unscientific
- · Replies 5 ·
Graduate Understanding Standing Waves in Hydrogen with Animation and Quantum Mechanics
- bobie
- · Replies 4 ·
Graduate Understanding Spin-Orbit Interaction's Impact on Electron Energy Levels
- bobie
- · Replies 4 ·
Graduate The double slit experiment question?
- masky007
- · Replies 4 ·
Graduate Collapsing the wavefuntion to an Energy Eigenfunction?
- mkarydas
- · Replies 3 ·
Graduate Are Lasers Truly Examples of Quantum Coherent States?
- Xyius
- · Replies 18 ·
Graduate Laplace-Runge-Lenz vector problem
- wantommy
- · Replies 2 ·
Graduate Form of Solution to Schrodinger Equation
- mrrelativistic
- · Replies 5 ·
Graduate Heisenberg's Uncertainty or hidden variable
- JohnLuck
- · Replies 9 ·
Graduate Completeness of the eigenfunctions (Which vectorspace?)
- Runei
- · Replies 2 ·
Graduate One dimensional problems. More particles.
- LagrangeEuler
- · Replies 5 ·
Graduate Perturbation theory (the math)
- Runei
- · Replies 5 ·
Graduate What is the average value of an observable in a quantum system?
- LagrangeEuler
- · Replies 7 ·
Graduate Phase factors with eigenstates
- Hazzattack
- · Replies 8 ·
Undergrad Activity of photon during wavelegnth duration
- acesuv
- · Replies 3 ·
Graduate How Can Mixed States Be Prepared Beyond Decoherence?
- naima
- · Replies 17 ·
Graduate Is determinism truly at play in this scenario?
- craigi
- · Replies 54 ·
Graduate Why do two people see the same experimental results?
- wmikewells
- · Replies 38 ·
Graduate All eigenvalues of a Hermitian matrix are real
- Isaac.Wang88
- · Replies 3 ·
Graduate Fermi's Golden Rule: non-sinusoidal [itex]t\to\infty[/itex]
- MisterX
- · Replies 6 ·
Graduate Graph States for Quantum Secret Sharing
- limarodessa
- · Replies 1 ·
Graduate Didn't understand what Sakurai meant by this.
- M. next
- · Replies 6 ·
Graduate Exact S-matrix for potential scattering
- alemsalem
- · Replies 1 ·
Graduate Diffraction accompanied with photoelectric effect
- bgq
- · Replies 6 ·
Graduate C-G coefficients by matrix method
- M. next
- · Replies 16 ·
Graduate The Relationship Between Wavelength and Amplitude of Photons and Electrons
- bobie
- · Replies 27 ·
Graduate Mean Occupation Number of Non-interacting quantum fluids
- unscientific
- · Replies 3 ·
Graduate Name of this relation, and struggle proving it.
- M. next
- · Replies 3 ·
Graduate What's up with the absorptive quantum eraser?
- ab_gladsaxe
- · Replies 5 ·
Graduate QFT (derivative the covariant and contravariant fields)
- aams
- · Replies 10 ·
Graduate Spin as internal angular momentum
- Idoubt
- · Replies 4 ·
Graduate Quantum Physics Science Advanced Project
- The12thDoctor
- · Replies 8 ·
Graduate Joint distribution of position and momentum
- atyy
- · Replies 6 ·
Graduate Understanding Spin Magnetic Field and its Direction in Relation to Charge Spin
- M.Kalai vanan
- · Replies 1 ·
Graduate Can Quantum States Be Deduced from a Density Matrix?
- suma
- · Replies 7 ·
Graduate Definition of Pointer in Measurement
- SheikYerbouti
- · Replies 2 ·
Graduate Simultaneous measuring of two operators
- Caulfield
- · Replies 4 ·
Graduate Fourier transform. Impulse representation.
- LagrangeEuler
- · Replies 1 ·
Graduate Is the Momentum Operator Hermitian in Quantum Mechanics?
- dyn
- · Replies 14 ·
Graduate Can Photon States Be Represented as Column Vectors in Quantum Mechanics?
- suma
- · Replies 1 ·
Graduate Changing the Hamiltonian without affecting the wave function
- Isaac.Wang88
- · Replies 1 ·
Graduate Understanding Normal Ordering: Anhillation and Creation Operators Explained
- kashokjayaram
- · Replies 3 ·
Graduate Quantum Mechanics without Measurement
- stevendaryl
- · Replies 286 ·
Graduate Partition Function, Grand Potential
- unscientific
- · Replies 2 ·
Graduate Calculating Probability of Field States in QFT
- GarageDweller
- · Replies 8 ·
High School Are electrons particles or waves?
- sharnrock
- · Replies 18 ·
Graduate Signs in the Field-Theoretic Euler-Lagrange Equation
- Xezlec
- · Replies 2 ·
Graduate What is the lowest rotational energy level for a diatomic molecule?
- spaghetti3451
- · Replies 2 ·
Graduate Why is the conductance quantized?
- wdlang
- · Replies 2 ·
Graduate My understanding of Quantum Fields [Please correct me if I'm wrong]
- themadquark
- · Replies 5 ·
Graduate Normal ordering versus no normal ordering
- geoduck
- · Replies 14 ·
Graduate Question on the 2-dim representation of the Lorentz group
- Kontilera
- · Replies 6 ·
Graduate How Do Eigenvalues Relate to Quantum Mechanics and Classical Physics?
- CSOleson
- · Replies 6 ·
Graduate What Causes Amplitude Changes in Light During Surface Interaction in QED?
- NewChemTeache
- · Replies 1 ·
Graduate Entanglement Swapping Superluminal Communication
- burke142
- · Replies 1 ·
Graduate The Extra Energy of a Doppler-Shifted Photon: Where Does it Go?
- Zak
- · Replies 2 ·
Undergrad Nuclear Rotation: Electrons & Nucleus Vibration in Atom
- M.Kalai vanan
- · Replies 2 ·
Graduate What are some examples of non-commutating observables in quantum mechanics?
- anorlunda
- · Replies 6 ·
Graduate Destructive interference with different path lengths?
- fleem
- · Replies 8 ·
Graduate What is the first and second quantization?
- Gabriel Maia
- · Replies 3 ·
Graduate Calc Commutator in Infinitely Potential Well: Is it Possible?
- LagrangeEuler
- · Replies 35 ·
Undergrad Heisenberg's Uncertainty Principle
- X_Art_X
- · Replies 13 ·
Graduate On the classical action in Feynman approach
- metroplex021
- · Replies 3 ·
Graduate 'Largest' Schrodinger cat states created to date?
- Gwinterz
- · Replies 2 ·
Graduate Expectation value for momentum operator using Dirac Notation
- sddang
- · Replies 12 ·
Graduate Relativistic Quantum Mechanics?
- Zak
- · Replies 7 ·
Graduate What is the use of Dirac delta function in quantum mechanics?
- manimaran1605
- · Replies 8 ·
Graduate Classical wavelength versus wavefunction
- idea2000
- · Replies 1 ·
Graduate Exotic particles from Casimir?
- nomadreid
- · Replies 1 ·
Graduate Linear superposition. Measurments.
- LagrangeEuler
- · Replies 3 ·
Graduate Explaining linear spectroscopy from first principles
- photon stew
- · Replies 7 ·
Graduate How do you rotate an electron 360 degrees?
- dsoodak
- · Replies 14 ·
Graduate How Does the Second Quantized Field Operator Act on a Two-Fermion Wave Function?
- Einj
- · Replies 2 ·
Graduate Casimir plates prevent photon existence only perpendicular to them?
- Edi
- · Replies 6 ·
Graduate Classic Oscillator: Understanding Matrix Form with Shankar
- chimay
- · Replies 3 ·
Graduate Quantum States and ladder operator
- kashokjayaram
- · Replies 13 ·
Graduate Entangled photons in double slit experiment
- 0xDEAD BEEF
- · Replies 5 ·
Graduate Are coordinate operators Hermitian?
- Heisenberg
- · Replies 3 ·
Graduate Commutation relation to find Sx, Sy
- M. next
- · Replies 7 ·
Graduate Acceleration. Infinite potential well.
- LagrangeEuler
- · Replies 4 ·