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 Can probability waves be "focused"?
- Grinkle
- · Replies 14 ·
Undergrad How can we observe and measure interacting vacuum?
- victorvmotti
- · Replies 1 ·
Undergrad How should we interpret the Möbius-strip image of spinors?
- pellis
- · Replies 1 ·
Undergrad Why ##S_z|+\rangle=\frac{\hbar}{2}|+\rangle##
- Kashmir
- · Replies 8 ·
Undergrad Frequency of EM waves in classical and quantum physics
- donniedarko
- · Replies 26 ·
High School What proof do we have of wave functions?
- Physics Slayer
- · Replies 16 ·
Undergrad Bell's inequality and locality constraints in probability theory
- Killtech
- · Replies 93 ·
Graduate Combining quantum Zeno effect and delayed choice eraser in beryllium trap
- hyksos
- · Replies 18 ·
High School Unitarity in GR+QFT: Obeying Full QG Model?
- Question69
- · Replies 2 ·
High School Wave-Particle Duality -- When is it a wave and when is it a particle?
- alexandrinushka
- · Replies 27 ·
Undergrad What is the difference between charge and force carriers?
- JohnH
- · Replies 3 ·
Undergrad X-ray fluorescence photons question
- GTrax
- · Replies 5 ·
Graduate Measurements at the LHC and field collapse in quantum field theory
- Jdeloz828
- · Replies 31 ·
High School Can entangled particle measurements transmit information faster than light?
- LozD
- · Replies 41 ·
Graduate Counting on a computing system
- thidmir
- · Replies 5 ·
Undergrad Where do these time derivatives of Pauli matrices come from?
- docnet
- · Replies 4 ·
Undergrad What Is the Diameter of a Photon?
- LightningInAJar
- · Replies 25 ·
Graduate Feynman propagator for a simple harmonic oscillator
- Glenn Rowe
- · Replies 9 ·
Undergrad CQED understanding superconducting qbits circuits
- maajdl
- · Replies 2 ·
Undergrad Setting up a double-slit experiment with which-way detection
- L1ght
- · Replies 6 ·
High School Are there any empirical tests for the GRW extension of quantum mechanics?
- Question69
- · Replies 45 ·
Undergrad Entropic effects of the Uncertainty Principle?
- oknow
- · Replies 2 ·
Undergrad Young's Double Slit Experiment: Is it Possible?
- Heidi
- · Replies 3 ·
Graduate What Are the Dimensions of Hilbert Space Elements in Quantum Mechanics?
- Ravi Mohan
- · Replies 14 ·
Undergrad What is the spin-boson model for decoherence in a Penning trap?
- Malamala
- · Replies 2 ·
Undergrad Quantization of the electromagnetic field
- Konte
- · Replies 5 ·
Graduate Perturbative Renormalization in Phi 4 Theory
- Diracobama2181
- · Replies 1 ·
Undergrad Angular momentum of an atom within a rigid body in motion
- james fairclear
- · Replies 61 ·
High School Peculiar View of Density Matrices: Is There a Problem?
- Heidi
- · Replies 3 ·
Graduate Loop Quantum gravity or String theory?
- areehantgupta
- · Replies 10 ·
Undergrad Frontiers in Physics had 2 papers quest. Bell's theorem, any othrs?
- ndvcxk123
- · Replies 2 ·
Undergrad Does entanglement interfere with causality?
- student34
- · Replies 35 ·
Undergrad Physical interpretation of this coherent state
- ergospherical
- · Replies 3 ·
Undergrad How should I think about decoherence?
- Malamala
- · Replies 17 ·
Undergrad Continuous Spectrum and Energy levels of Electrons (Energy Bands)
- ktmsud
- · Replies 7 ·
High School Tardigrade is first multicellular organism to be quantum entangled
- CoolMint
- · Replies 42 ·
Graduate Renormalization with hard cutoff of a loop diagram with single vertex
- theittsco
- · Replies 1 ·
High School Quantum Decoherence: What Happens to Other Outcomes?
- Question69
- · Replies 7 ·
Undergrad Matrix elements of scalars under parity inversion
- ergospherical
- · Replies 5 ·
Graduate Why is gauge invariance important in quantum mechanics?
- Heidi
- · Replies 10 ·
Graduate Degenerate Perturbation Theory: Correction to the eigenstates
- Kaguro
- · Replies 2 ·
Graduate In QFT, what is the momentum of a created particle?
- Christian Thom
- · Replies 12 ·
Undergrad Are all (pure) states physically realizable?
- einheit
- · Replies 11 ·
Undergrad Blue lights (LEDs) consume more power than red (and green)?
- Metals
- · Replies 25 ·
Undergrad When does an even potential give both even and odd solutions to Schrodinger's Eqn?
- jstrunk
- · Replies 3 ·
Undergrad A thought experiment concerning determinism in quantum mechanics
- Spathi
- · Replies 2 ·
Insights Properties and classification of baryon particles
- PeroK
- · Replies 7 ·
Undergrad Interference of signal photons entangled with idlers
- Sonderval
- · Replies 2 ·
Undergrad Virtual Photons: The Long-Distance Repulsion of Electrons
- Green dwarf
- · Replies 2 ·
Undergrad How are good quantum numbers related to perturbation theory?
- mathingenue
- · Replies 18 ·
Undergrad A popular explanation of Bell's inequalities
- Spathi
- · Replies 16 ·
Undergrad Does putting a hydrogen atom in a box mix angular momentum states?
- Twigg
- · Replies 2 ·
High School Is the weak nuclear force attractive or repulsive or both?
- abdossamad2003
- · Replies 18 ·
Undergrad Feynman diagram for photon-photon scattering γ+γ→γ+γ
- ghbeefcake
- · Replies 2 ·
Undergrad How do raising and lowering operators work in quantum mechanics?
- VVS2000
- · Replies 3 ·
Graduate Klein paradox in the massless case
- Paul159
- · Replies 1 ·
Undergrad How does QM explain that we see electrons circulating in a magnetic field?
- Heidi
- · Replies 33 ·
Undergrad Non-relativistic limit of Klein Gordon field
- dRic2
- · Replies 2 ·
Graduate Spontaneous and stimulated emission in Planck's radiation law
- dbabic
- · Replies 5 ·
High School Is matter a particular form of energy?
- CoolMint
- · Replies 7 ·
Undergrad Entanglement, Mixed or Pure State?
- stephen8686
- · Replies 3 ·
Undergrad Reversing a series of polarizers
- kurt101
- · Replies 17 ·
Insights The 7 Basic Rules of Quantum Mechanics
- A. Neumaier
- · Replies 70 ·
Undergrad Cyclic rotation of the cross product involving derivation
- Garlic
- · Replies 12 ·
High School What is actually spinning in quantum spin?
- Stevexyz
- · Replies 22 ·
Undergrad A Question on Spinors in a High school textbook
- Falgun
- · Replies 3 ·
Undergrad Does gravity exist at the quantum level if it's caused by time dilation?
- curiouschuck
- · Replies 10 ·
High School Is the highest frequency possible the inverse of Planck time?
- brajesh
- · Replies 2 ·
Graduate Mixed versus Pure Quantum States for the Singlet
- knowwhatyoudontknow
- · Replies 16 ·
Graduate Complete characterization of local monomials
- Gaussian97
- · Replies 0 ·
Undergrad Macroscopic quantum entanglement?
- Sciencelad2798
- · Replies 12 ·
Graduate Active and Passive Transformations Confusion
- ThereIam
- · Replies 8 ·
High School Two questions about Black body radiation
- vijayantv
- · Replies 12 ·
Undergrad Physical proof of a simulation?
- Sciencelad2798
- · Replies 5 ·
Undergrad Quantum Spin - If It’s Not Spinning, What Is It Doing?
- BadgerBadger92
- · Replies 12 ·
Undergrad Notation of the approximation in quantum phase estimation algorithm
- Peter_Newman
- · Replies 1 ·
High School Q - Double slit experiment, delayed slit selection observation
- Matt711
- · Replies 5 ·
Graduate Orthogonality of variations in Faddev-Popov method for path integral
- Wizard
- · Replies 1 ·
Graduate Weyl Fermion in an infinite well
- Paul159
- · Replies 1 ·
Undergrad Significance of double slit experiment?
- LightningInAJar
- · Replies 5 ·
Graduate Does quantizing metric fields mean quantum gravity?
- Haorong Wu
- · Replies 7 ·
Undergrad Derivation of Schrodinger equation (chicken and egg problem?)
- Hamiltonian
- · Replies 17 ·
Undergrad How indistinguishable are photons?
- Killtech
- · Replies 32 ·
Undergrad Can a static EM field consist of photons?
- fxdung
- · Replies 14 ·
Undergrad Interferences (with diagonal density matrix)
- Heidi
- · Replies 11 ·
Undergrad How to Find the Berry Phase in Slowly Varying Systems
- ergospherical
- · Replies 2 ·
Undergrad Why we know average speed of single photon equal speed of EM wave?
- fxdung
- · Replies 4 ·
High School Polarization of a single photon
- Sophrosyne
- · Replies 10 ·
Graduate What is the achievable accuracy of neutrino speed measurement?
- hyau
- · Replies 2 ·
Undergrad Participatory Anthropic Principle
- Jim Kata
- · Replies 1 ·
High School Can particles appear from "actual" nothing including no space?
- gary0033
- · Replies 28 ·
Undergrad Is there a multicolor single photon?
- fxdung
- · Replies 6 ·
Undergrad Are All Electrons Truly Identical?
- Sciencelad2798
- · Replies 26 ·
Undergrad How does phase-sensitive detection eliminate noise?
- ergospherical
- · Replies 7 ·
High School Does Quantum Entanglement Suggest a Fake Universe?
- Sciencelad2798
- · Replies 19 ·
Undergrad Quantum phase estimation - Question regarding rewriting the state
- Peter_Newman
- · Replies 5 ·
Graduate Transmission coefficient problem from Landau-Lifshitz chapter III
- paul159753
- · Replies 2 ·
Graduate Pauli Villars for Quadratic Divergences
- Diracobama2181
- · Replies 2 ·
High School Quantum entanglement and communications
- ElliotSmith
- · Replies 2 ·
Undergrad Understanding spinor transformation law
- pellis
- · Replies 4 ·