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.
Threads
Graduate Quantization of real Klein-Gordon field (sign issues)
- The Tortoise-Man
- · Replies 24 ·
Graduate Anti-commutation relation for quantized fields
- The Tortoise-Man
- · Replies 13 ·
Undergrad Black Hole Fire Walls, Brick Walls, and the Casimir Effect
- .Scott
- · Replies 6 ·
Undergrad Impossible probability between theoretical possibility and reality
- Kinker
- · Replies 23 ·
High School Quantum Entanglement in Practice
- Pixelex
- · Replies 2 ·
High School Does decoherence prevent 100% of quantum tunneling of macro object?
- Kinker
- · Replies 4 ·
Undergrad If we wait infinitely long, will macroscopic objects undergo quantum tunneling?
- Kinker
- · Replies 54 ·
Undergrad Can Electrons or Photons Exceed Light Speed?
- cathrynliz
- · Replies 1 ·
Undergrad Questions on the classical interpretation of (normal) Zeeman effect
- ValeForce46
- · Replies 10 ·
High School Wavefunction and Lorentz Invariance
- cosmanino2050
- · Replies 1 ·
High School Preference for the notation used for the wave function?
- entropy1
- · Replies 9 ·
Undergrad In what chapter do Mehra and Rechenberg discuss Pauli matrices?
- Frigorifico9
- · Replies 6 ·
Undergrad Could a quantum computer simulate any system based on different types of logic?
- murtazashab
- · Replies 2 ·
Graduate Lagrangian in the Path Integral
- YeaNah
- · Replies 13 ·
Undergrad Does the Stern-Gerlach experiment measure only one spin component?
- okaythanksbud
- · Replies 12 ·
Undergrad Is my interpretation of the g-factor correct?
- Frigorifico9
- · Replies 4 ·
High School Direct sum decomposition into orthogonal subspaces
- sindhuja
- · Replies 2 ·
Undergrad Who was the first to make a Stern-Gerlach experiment with two magnets?
- Frigorifico9
- · Replies 9 ·
Undergrad Normalizing factor of wave function
- Lagrange fanboy
- · Replies 13 ·
Undergrad What Is the Difference Between Loss and Cost Functions in Quantum Computing?
- SaschaSIGI
- · Replies 3 ·
Undergrad Electrical Analog of Aharonov-Bohm Effect
- LarryS
- · Replies 8 ·
Undergrad Parallel transport and entanglement
- Heidi
- · Replies 5 ·
Undergrad When was the formula for the Stern-Gerlach experiment found?
- Frigorifico9
- · Replies 7 ·
High School What are quantum states of molecular rotation and torsion?
- syfry
- · Replies 4 ·
Graduate SU(2) and SU(3) representations to describe spin states
- spin_100
- · Replies 7 ·
Undergrad Energy eigenvalue of H0+λp/m under gauge transformation
- Jiangwei Du
- · Replies 5 ·
Undergrad What do the authors of the paper mean here exactly by path integral?
- Andrewmiller5432
- · Replies 6 ·
High School Virtual particles and Heisenberg
- jcalises
- · Replies 15 ·
Undergrad Solving the Schrodinger Equation for a particle being measured
- physwiz222
- · Replies 6 ·
Undergrad What is the energy of an atom in a magnetic trap as a function of position?
- Malamala
- · Replies 6 ·
Undergrad Entangled, mixed state with conditional entropy zero
- greypilgrim
- · Replies 1 ·
Undergrad QED Picture of static EM Fields
- physwiz222
- · Replies 3 ·
Graduate Asymptotic states in the Heisenberg and Schrödinger pictures
- UnreliableObserver
- · Replies 8 ·
Undergrad About the position of electrons (uncertainty)
- pokespriter
- · Replies 6 ·
Undergrad Why does non-commutation of x and p operators prevent simultaneous definition?
- physwiz222
- · Replies 17 ·
Undergrad Measuring electron spin and measuring entangled electron spin
- Athraxin
- · Replies 12 ·
Undergrad Delayed Choice Quantum Eraser with altered beam splitter
- Athraxin
- · Replies 8 ·
High School [SOLVED] Regarding the Superposition of Two Plane Waves
- Slimy0233
- · Replies 5 ·
Undergrad Why is BBO the most used crystal for second-order nonlinear optics?
- James2018
- · Replies 1 ·
High School QM randomness vs chaotic determinism?
- lukephysics
- · Replies 28 ·
Undergrad Energy Non-Conservation in Quantum Mechanics
- Coelum
- · Replies 22 ·
Undergrad Delayed choice quantum eraser setup with no beam splitter
- Athraxin
- · Replies 14 ·
Undergrad How to prove that the L and S (of the total angular momentum commute?
- Heidi
- · Replies 17 ·
High School Particle Movement in Quantum Mechanics
- Islam Hassan
- · Replies 35 ·
Undergrad Spin uncertainty relation after measuring σz exactly
- JBlue
- · Replies 4 ·
Undergrad On a constructive method of quantum state preparation (Ballentine)
- EE18
- · Replies 2 ·
Undergrad Trying to understand why electrons fill orbitals the way they do
- physicurious
- · Replies 10 ·
High School Is there a probability in QM that an event happens at time t?
- Heidi
- · Replies 61 ·
Undergrad General argument that entanglement can only be created locally
- greypilgrim
- · Replies 31 ·
Undergrad What role does Quantum Mechanics play in a internal combustion engine?
- obbeel
- · Replies 6 ·
High School Why don't gravitons and photons annihilate if they're antiparticles of each other?
- Any name will do
- · Replies 16 ·
Graduate Are Casimir effect quantum fluctuations virtual or real photons?
- peterbb
- · Replies 46 ·
Undergrad What Is Bell's Theorem and Why Does It Matter?
- golya
- · Replies 3 ·
Graduate Reducing relativistic effective Hamiltonian to non-relativistic limit
- Malamala
- · Replies 1 ·
Undergrad Solutions of the Bloch equations for MRT
- Derbyshire
- · Replies 6 ·
High School The nature of anti-particles and anti-matter (a dilettante asks)
- Any name will do
- · Replies 8 ·
Graduate Is the Fractional Quantum Hall Effect an emergent property?
- Cato
- · Replies 4 ·
Undergrad How exactly does spooky action at a distance violate SRT?
- greypilgrim
- · Replies 18 ·
Graduate Why does Monkhorst-Pack increase while K-point mesh decreases with cell size?
- ramana3797
- · Replies 1 ·
Graduate How can a 'Principle' produce a 'Force'?
- sophiecentaur
- · Replies 12 ·
Graduate Method for delaying photon 140ms+ while maintaining entanglement?
- criquant
- · Replies 7 ·
Undergrad Spontaneous Symmetry Breaking and quantum mechanics
- arivero
- · Replies 15 ·
Undergrad Phenomena: Recent + Documented
- Immer Tzaddi
- · Replies 1 ·
Graduate Importance of Densities in QFT
- physwiz222
- · Replies 1 ·
Graduate Two Slit Interference Experiment Variations
- Chas Tennis
- · Replies 4 ·
High School Double slit experiment, expensive gear?
- rolnor
- · Replies 49 ·
Undergrad What does ## \psi^{*}\hat{H}\psi ## mean?
- ConjugatedClanger
- · Replies 9 ·
Undergrad Can We Accurately Measure Momentum in the Lab?
- dsaun777
- · Replies 20 ·
High School Extremely elementary questions about QM
- okaythanksbud
- · Replies 24 ·
Graduate QFT S-matrix explanations are incomprehensible
- jostpuur
- · Replies 2 ·
Graduate What exactly does 'Locality' in Gauge Theory mean?
- The Tortoise-Man
- · Replies 5 ·
Graduate Potential between Photons via Delbruck Scattering
- DuckAmuck
- · Replies 5 ·
Graduate What is the geometry of a gauge potential in the A-B experiment?
- Anko
- · Replies 2 ·
High School Are photons and all matter fundamentally waves or particles?
- ISamson
- · Replies 17 ·
Undergrad Double slit as a function of time
- dom_quixote
- · Replies 9 ·
Graduate Proving BF action is a difference of Chern-Simons actions
- StarWombat
- · Replies 0 ·
Undergrad Some questions about this vintage periodic table
- jmatt
- · Replies 10 ·
High School What happens to excess energy when an electron gets excited by light?
- Richard2001
- · Replies 7 ·
Graduate How to derive the quantum detailed balance condition?
- lsdragon
- · Replies 0 ·
Undergrad How does spontaneous parametric down-conversion generate entanglement?
- James2018
- · Replies 4 ·
Graduate Why does the description of a composite system involve a tensor product?
- prabin
- · Replies 2 ·
Graduate Ground state calculation with a time averaged wave function
- hilbert2
- · Replies 2 ·
Undergrad How are entangled photons identified among many others?
- RobbyQ
- · Replies 4 ·
Undergrad Confusion Regarding a Spectral Decomposition
- ARoyC
- · Replies 6 ·
Undergrad Can we now explain the Fine Structure Constant?
- RobbyQ
- · Replies 5 ·
Undergrad Do EM waves have negative frequency inside negative-index materials?
- jeast
- · Replies 4 ·
Undergrad How can I model squeezed states in 3D optical modelling software?
- Sciencemaster
- · Replies 1 ·
Undergrad Confusions I have regarding Measurements in Quantum Mechanics
- ARoyC
- · Replies 11 ·
Undergrad How Do Gauge and Phase Symmetries Differ in Quantum Systems?
- DrDu
- · Replies 6 ·
High School Interferometry: Photons Needed for Interference Pattern
- Bob8102
- · Replies 3 ·
Graduate Anti-symmetric tensor question
- DuckAmuck
- · Replies 6 ·
Undergrad Where do the vibrational modes of molecules come from?
- asphy
- · Replies 2 ·
Undergrad How is the Schrodinger equation related to the Heisenberg equation?
- Thamyres MARTINS
- · Replies 4 ·
Graduate Why Can't I Derive Eq.(7) from Phys.Lett.B Vol.755?
- PRB147
- · Replies 8 ·
Undergrad Is photon energy negative in a negative-index metamaterial?
- jeast
- · Replies 11 ·
Undergrad Force carrier particle trajectories and warped spacetime
- jaketodd
- · Replies 2 ·
Undergrad Do Two Photons in a Radiative Cascade Exhibit Directional Correlation?
- Clovis
- · Replies 14 ·
Undergrad The speed of forces, and applying relativity to force carriers
- jaketodd
- · Replies 7 ·
Undergrad Callan-Symanzik equation for Effective Potential
- thatboi
- · Replies 1 ·
Undergrad Quantum Circuit Confusion On Time Evolution
- thatboi
- · Replies 1 ·