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 What is the Lamb-Dicke regime and how does it impact ion trapping experiments?
- Nusc
- · Replies 2 ·
Graduate Stern-Gerlach Question: Can Interference be Seen?
- msumm21
- · Replies 12 ·
Graduate Raising and lowering operators acting on spin 1 kets?
- philip041
- · Replies 3 ·
Graduate Quantized vs. Continuous Variables
- Tac-Tics
- · Replies 11 ·
Graduate Why Is the Uncertainty Principle Considered Strange?
- mskaroly
- · Replies 3 ·
Undergrad Quantum physics vs classical physics
- noobie!
- · Replies 2 ·
Graduate The Hilbert space of non-relativistic QM
- Fredrik
- · Replies 5 ·
Graduate About momentum operator in other coordinate system
- KFC
- · Replies 1 ·
Graduate Quantum Mechanics: Wave-Particle Duality & Paradox
- tgt
- · Replies 38 ·
Graduate Direct Position Measurement on a Microscopic Scale with Twin Photons
- newbee
- · Replies 48 ·
Graduate Spin ½ Particles: Turning Twice for Identical Results
- Love*Physics
- · Replies 15 ·
Graduate Identical bosons vs. fermions in square potential well
- bobshae
- · Replies 2 ·
Graduate Gauge Invariance: Classical vs Quantum
- captain
- · Replies 4 ·
Graduate Pauli's Wave Mechanics text. h vs. hbar
- Peeter
- · Replies 2 ·
Graduate Understanding the Dressed Particle Approach to Quantum Field Theory
- spidey
- · Replies 19 ·
Graduate What is Quantum Theory and Why Do Electrons Orbit at Specific Distances?
- quantum brain
- · Replies 5 ·
Graduate Product State Bra Order: Correct Form?
- KFC
- · Replies 2 ·
Graduate Reflection and the measurement, and time irreversibility
- Dmitry67
- · Replies 2 ·
Undergrad Why do we use short wavelength photons in Compton scattering?
- KFC
- · Replies 2 ·
Graduate Does the calculated large cosmological constant in falsify QFT?
- ensabah6
- · Replies 6 ·
Graduate Quantization and fluid mechanics?
- quantumfireball
- · Replies 7 ·
Graduate Evaluating Feynman diagram in QFT without external fermion lines
- Amanheis
- · Replies 4 ·
Graduate Understanding Energy Partition in Laser Cavity: Molecules vs. Radiation
- Phrak
- · Replies 11 ·
Graduate Raising and lowering operators on a ket?
- philip041
- · Replies 18 ·
Graduate Orders of magnutide in Heisenberg's uncertainty principle
- Heirot
- · Replies 3 ·
Graduate The intense laser-atom physics and ionized electron
- xylai
- · Replies 7 ·
Graduate Adjoint Operator: Use & Benefits
- KFC
- · Replies 9 ·
Graduate Path Integral Doubt: How Did Shankar Deduce S/h>pi?
- sumeetkd
- · Replies 1 ·
Graduate Heisenberg's Principle: Understanding Time & Energy
- pi.rootpi
- · Replies 3 ·
Graduate Understanding Spin States in Quantum Mechanics
- KFC
- · Replies 2 ·
Undergrad Basics of Quantum Chemistry, especially entanglement
- darkmatter(s)
- · Replies 5 ·
Graduate Is a Photon Massless or Does it Have Relativistic Mass?
- Nphysicist
- · Replies 13 ·
Graduate Operating on spin angular momenta
- runninglow
- · Replies 1 ·
Graduate Pulsing a diode laser with very long pulses and very low repetition rates
- r_daniel
- · Replies 2 ·
Graduate Two Identical Particles w/ Spin State s
- degerativpart
- · Replies 3 ·
Graduate Born vs ABL Rules: How Do They Relate to Time Reversal in Quantum Mechanics?
- Fredrik
- · Replies 15 ·
Graduate Greatest accuracy in the |mn> state is |n| = m
- bra-kets
- · Replies 2 ·
Graduate Conjugate Variables: Uncertainty Relation Explained
- spidey
- · Replies 2 ·
Graduate Question about the delta function
- Fredrik
- · Replies 1 ·
Graduate Casimir Effect and Perpetual Motion
- Zeteg
- · Replies 16 ·
Graduate Expectation value for radius of an electron in a hydrogen atom
- emperrotta
- · Replies 8 ·
Graduate Older formulation of Pauli exclusion principle
- kandhakumar
- · Replies 2 ·
Graduate Drawback of Hartree Product in Chemistry
- kandhakumar
- · Replies 2 ·
Graduate Quantum Communication - Ideas & Solutions
- McGarr
- · Replies 10 ·
Graduate Cavitation-does it relate to the Big Bang?
- Earnest Stuar
- · Replies 6 ·
High School Looking for Layman's Physical Explanation for energy level in atoms
- feynmann
- · Replies 23 ·
Graduate Does an electron have a makeup
- ryn17
- · Replies 72 ·
Graduate Commutate relation of lowering operator and sperical tensor operators
- Einsling
- · Replies 1 ·
Graduate What are the key misconceptions about quantum mechanics interpretations?
- thenewmans
- · Replies 1 ·
Graduate Stationary State: Energy & Time-Independent Wave Function
- KFC
- · Replies 5 ·
Graduate Atom Shape: Experiments, Spheres & Cubes in Physics
- Chaos' lil bro Order
- · Replies 30 ·
Graduate Effects of the Variation of the Parameters of the Standard Model
- Dmitry67
- · Replies 2 ·
Graduate What Is the Ground State of Bound Fermions in a Box?
- Evgeny Naumov
- · Replies 11 ·
Graduate Quantum Field Theory: Multiparticles and Single Particles
- martyf
- · Replies 2 ·
Graduate Need a topic for paper in modern physics
- dswatson
- · Replies 7 ·
Graduate Quantum Decoherence - how fast does it propagate?
- Dmitry67
- · Replies 15 ·
Graduate Peskin - exponention of disconnected diagrams
- PJK
- · Replies 3 ·
Graduate Uncertainty Principle: Photon Momentum & Universe
- glueball8
- · Replies 1 ·
Graduate Question about quantization of scalar field
- martyf
- · Replies 1 ·
Graduate Please shred my quantum physics-gravity worldview
- lkubat
- · Replies 13 ·
Graduate Backwards Time Travel: Breaking the Heisenberg Principle?
- Math Jeans
- · Replies 31 ·
Graduate Interference pattern given many which-path detectors?
- gendou2
- · Replies 2 ·
Graduate Absorption Paradox: Continuous Photon Energies and Quantized Molecule Energies
- p.tryon
- · Replies 5 ·
Undergrad Photon spin - experimental evidence
- Usaf Moji
- · Replies 6 ·
Graduate Is Everything in the Universe Entangled According to Physics?
- pallidin
- · Replies 77 ·
Graduate Do spontaneous and stimulated emission obey to a Boltzmann's statistics ?
- fred_run
- · Replies 6 ·
Undergrad Photon Generation: Need for Electrical Current?
- cam875
- · Replies 34 ·
Graduate How Does Aperture Size Affect Laser Beam Uncertainty?
- fisico30
- · Replies 4 ·
Graduate WE theorem to evaluate matrix elements
- pollo
- · Replies 1 ·
Graduate The physical meaning of Pauli Spin Matrices
- gn0m0n
- · Replies 16 ·
Graduate Size does matter? Rayleigh scattering question
- DeepSeeded
- · Replies 1 ·
Graduate Angular Momentum - Hydrogen (Quick Question)
- mrjammin
- · Replies 1 ·
Graduate Conservation of momentum in QFT
- jdstokes
- · Replies 1 ·
Graduate Vastness of space and infinite universes
- bxadook
- · Replies 3 ·
Undergrad Problem in the Defination of electon's wavelength
- soopo
- · Replies 2 ·
Undergrad Can Events with Zero Probability Actually Occur?
- lax1113
- · Replies 23 ·
Undergrad No coupling of Photons with eletric fields
- eintagsfliege
- · Replies 3 ·
Graduate Quantum Eraser and Delayed Choice Quantum Eraser
- thenewmans
- · Replies 1 ·
Graduate Understanding the Basics of Psi(x) in Quantum Mechanics: Confusion Clarified
- joker_900
- · Replies 12 ·
Graduate Prove Spinor Identity in Arbitrary Dimension
- ismaili
- · Replies 1 ·
Graduate Does the Delayed Choice Experiment Challenge Classical Intuition?
- debra
- · Replies 1 ·
Graduate Is Angular Momentum Quantized in a Free Electron's Non-Orbital Motion?
- Eezekiel
- · Replies 14 ·
Graduate Wouldn't the Geiger Counter be considered a measuring device in SC?
- esvion
- · Replies 1 ·
Undergrad Refraction - The lingering question
- Burningmace
- · Replies 12 ·
Graduate Why 1D well must has this solution?
- KFC
- · Replies 6 ·
Undergrad Narrow slits causes a diffraction pattern
- Tac-Tics
- · Replies 2 ·
Graduate Calculating Inner Products of Spinors for QFT
- CompuChip
- · Replies 5 ·
Graduate De Broglie Waves: Understanding Wave-Particle Duality
- Vinu90
- · Replies 1 ·
Undergrad Why Does an Atom Experience Red and Blue Shifts During Its Journey?
- cks
- · Replies 2 ·
Graduate Are Hilbert spaces uniquely defined for a given system?
- diegzumillo
- · Replies 2 ·
Graduate Could positrons be electrons from the future traveling back in time?
- ensabah6
- · Replies 3 ·
Graduate Classical vs Quantum Electromagetism
- LarryS
- · Replies 1 ·
Graduate How useful would a metric independant basis be?
- CPL.Luke
- · Replies 3 ·
Graduate How Does the Wavefunction Behave at an Infinite Potential Barrier?
- ballzac
- · Replies 4 ·
Graduate Coherent States of the Quantum Harmonic Oscillator
- arhanbezbora
- · Replies 5 ·
Graduate Complex conjugate of wave function
- Amith2006
- · Replies 4 ·
Graduate Does collapse violate exchange symmetry?
- Demystifier
- · Replies 6 ·
Graduate What does a single photon look like
- quasar987
- · Replies 34 ·
Undergrad Question on electron orbitals and wavelengths?
- Austin0
- · Replies 16 ·
Graduate Completeness of the Number States
- afrano
- · Replies 4 ·