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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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 Gravitrons vs Photons: how come light and gravity exist?
- 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 ·
Undergrad Can the Lieb-Robinson Bound be Intuited from the Taylor Series of an Operator?
- thatboi
- · Replies 1 ·
High School What is the nature of de Broglie matter wave? Is it longitudian or transverse?
- nohtha
- · Replies 8 ·
Undergrad Interpreting Unitary Time Evolution
- thatboi
- · Replies 10 ·
Undergrad Generating Entangled Electron Pairs
- RobbyQ
- · Replies 6 ·
Undergrad A hurdle in quantum computing I've never been able to figure out
- jaketodd
- · Replies 26 ·
Undergrad Quantum Mechanics vs Einstein: Light Btwn Black Holes, Double Slit Experiment
- namelessuser
- · Replies 3 ·
Undergrad Is there a Crookes radiometer device with photoelectric effect?
- jonjacson
- · Replies 1 ·
Undergrad Can entangled particles reveal what happens inside black holes?
- jaketodd
- · Replies 4 ·
Undergrad What is the limit in size that two particles/objects can be entangled?
- jaketodd
- · Replies 5 ·
High School Is it possible to get the photoelectric effect in red color frequency?
- Renandornelles
- · Replies 11 ·
Undergrad Spectroscopy: vibronic and rotational transitions
- pisluca99
- · Replies 1 ·
Undergrad Antisymmetrizing a Factorized Polynomial Vanishes?
- thatboi
- · Replies 0 ·
Undergrad Is there a generator of entangled photons with fixed polarization?
- prokopcio
- · Replies 11 ·
Undergrad Is g₃/₂(z) = λ³/v valid for all temperatures in ideal Bose gas?
- Wrichik Basu
- · Replies 2 ·
Graduate Identity with Gamma matrices and four-vector contractions
- Francisco Alegria
- · Replies 2 ·
Undergrad Time dependence of operators in the Schrödinger picture
- The Tortoise-Man
- · Replies 5 ·
Undergrad Expectation value of expanded variable in anharmonic oscillator potential
- Malamala
- · Replies 2 ·
Undergrad Singlet Halperin State Construction
- thatboi
- · Replies 0 ·
Undergrad What is a False Vacuum? Understanding its Properties and Energy Differences
- KurtLudwig
- · Replies 10 ·
Undergrad Does Hawking radiation imply all matter eventually becomes light?
- jaketodd
- · Replies 10 ·
High School What Distinguishes Wavefunction from Superposition in Photon Behavior?
- syfry
- · Replies 27 ·
High School Does Wavelength Affect Uncertainty in Macroscopic Objects?
- John Constantine
- · Replies 11 ·
Graduate Number of particles in canonical ensemble
- Demystifier
- · Replies 9 ·
Undergrad Feedback on my Jaynes-Cummings model Python implementation
- JonPoplett
- · Replies 2 ·
Undergrad Why do heat and electrical discharge excite multiple energy levels in hydrogen?
- pisluca99
- · Replies 3 ·
Undergrad The Hamiltonian elements in Anderson dimer
- hokhani
- · Replies 4 ·
Undergrad Two-photon Stimulated Raman Transitions
- Nijiro
- · Replies 2 ·