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
Undergrad Vacuum energy versus expansion of the Universe
- Italian_Mike
- · Replies 1 ·
Undergrad Can identical particles be distinguishable?
- Twigg
- · Replies 2 ·
Undergrad Question on derivation/notation in a report
- TheCanadian
- · Replies 6 ·
Graduate How do we *know* the Schrodinger equation for H2+ can't be solved?
- AxiomOfChoice
- · Replies 27 ·
Undergrad Time evolution of a wave function
- Abhishek Sethi
- · Replies 13 ·
High School Do entangled particles need to be physically delivered to enable communication?
- PeterPendragon
- · Replies 12 ·
Graduate Change of the order of integration including Dirac delta
- GIM
- · Replies 36 ·
Graduate Effect of time reversed hamiltonian acting on a state?
- Brage
- · Replies 4 ·
High School Why can't Feynman's rolling slit apparatus be reset between electrons?
- lavinia
- · Replies 29 ·
Graduate Radiation from a dielectric body
- Karthiksrao
- · Replies 4 ·
Undergrad Photons being released from fire/heat
- victorhugo
- · Replies 1 ·
Undergrad Representing Mixed States in Hilbert Space
- Muthumanimaran
- · Replies 5 ·
High School In need of cool experiments for show called 'Quantum'
- Christina Eddowes
- · Replies 8 ·
High School Questions about recent paper on Entangled Histories
- quantumfunction
- · Replies 15 ·
Graduate On the renormalization group flow
- thephystudent
- · Replies 15 ·
Undergrad Problem in Deriving Rayleigh-Jeans Formula
- MnFeCo
- · Replies 1 ·
Undergrad Triplet State Symmetric Wavefunction
- looseleaf
- · Replies 6 ·
High School Does Schrödinger's paradox work with multiple boxes?
- ProfuselyQuarky
- · Replies 11 ·
Undergrad Making a quantum computer do Shor's algorithm
- anorlunda
- · Replies 1 ·
Graduate Wrong integration in Sakurai-Napolitano(and Fetter-Walecka)?
- ShayanJ
- · Replies 11 ·
Undergrad How to distinguish pure and mixed states for a spin 1/2 particle
- dyn
- · Replies 16 ·
Graduate Clifford Algebra and generalizing Dirac equaution
- Traruh Synred
- · Replies 12 ·
Undergrad Relation between quantum fluctuations and vacuum energy?
- Frank Castle
- · Replies 75 ·
Graduate Does true randomness exist in nature?
- ddjj77
- · Replies 9 ·
High School Entangled photons thought experiment
- Jeronimus
- · Replies 20 ·
High School Nature of collapse / does collapse exist?
- entropy1
- · Replies 34 ·
Graduate Lay Question Regarding Compton Scattering
- Jim Lundquist
- · Replies 3 ·
Undergrad Quantum experiments and entropy question
- Gerinski
- · Replies 4 ·
Undergrad Entanglement, can we predict the outcome?
- friend
- · Replies 13 ·
High School Does Quantum Physics really defy logic?
- CuriousPhilosopher
- · Replies 14 ·
Undergrad The energy term in Schroedinger equation
- amjad-sh
- · Replies 35 ·
Undergrad No Infinite speed on information yet?
- seb7
- · Replies 3 ·
Graduate Image force in normal metal electrode tunneling
- Louis Fry
- · Replies 1 ·
High School Equivalence of entanglement and decoherence?
- entropy1
- · Replies 23 ·
Undergrad Energy levels generally invariant under fixed V, changing T
- bananabandana
- · Replies 1 ·
Undergrad How do you derive Slater determinant from creation operator?
- Amentia
- · Replies 2 ·
Undergrad Could Planck have used different energy-frequency relation?
- pero2912
- · Replies 2 ·
Undergrad Does Relativity and Quantum Mechanics NEED to be reconcile?
- Flatland
- · Replies 14 ·
Undergrad Eigenvalue Problem: What Is It?
- Hamza Abbasi
- · Replies 6 ·
Graduate What is the best Quantum Model to solve many body problems?
- jonjacson
- · Replies 7 ·
Undergrad Expectation value in terms of density matrix
- entropy1
- · Replies 1 ·
High School Order of observations in Bell experiments
- Android Neox
- · Replies 2 ·
Undergrad What does the act of observing do exactly?
- benorin
- · Replies 44 ·
Graduate Using quantum-secured communication for data transfering
- wonderingfidielity
- · Replies 2 ·
High School What is the relationship between the Planck length and black holes?
- edguy99
- · Replies 9 ·
Graduate Heisenberg ferromagnet -- Spontaneous symmetry breaking
- LagrangeEuler
- · Replies 11 ·
Undergrad Understanding commutator relations
- TheCanadian
- · Replies 5 ·
Undergrad Why Can't We Fix the Gauge in the Magnetic Aharonov-Bohm Effect?
- LarryS
- · Replies 7 ·
Undergrad What is the size of neutrons in a neutron star?
- Cato
- · Replies 3 ·
Undergrad Proof of unitarity of time evolution in Susskind's book
- entropy1
- · Replies 26 ·
Graduate Deutsch–Jozsa algorithm/Circuit Analysis
- bapgobears
- · Replies 4 ·
Undergrad Lagrangian and Feynman diagrams
- Neutrinos02
- · Replies 3 ·
High School Time reversibility in quantum mechanics
- Justice Hunter
- · Replies 1 ·
High School Position of a harmonic oscillator
- A. Neumaier
- · Replies 20 ·
Graduate Methods for finding properties of quantum dots?
- ElizabethMaybe
- · Replies 3 ·
Undergrad QM - Ladder Operator QHO - factorization
- JaneHall89
- · Replies 1 ·
Graduate Electron shell further away from nucleus higher Energy lvl?
- Boomzxc
- · Replies 4 ·
High School Which component of light is a photon?
- LSMOG
- · Replies 7 ·
Undergrad Can a Photon be Absorbed Without the Exact Energy Level?
- NaiveTay
- · Replies 36 ·
Undergrad Is eA eB = eA+B e[A,B]/2 the Baker-Campbell-Hausdorff formula?
- dyn
- · Replies 10 ·
Undergrad Can diffraction be explained by quantisation?
- Jilang
- · Replies 30 ·
Graduate Phase factors and Modulus Square?
- kq6up
- · Replies 6 ·
High School Two-Slit Experiment And Varying Electron Momentum
- NaiveTay
- · Replies 3 ·
Graduate Collapse and projection-valued measures
- burakumin
- · Replies 4 ·
Undergrad Schrödinger equation and interaction Hamiltonian
- TheCanadian
- · Replies 8 ·
Graduate Forbidden Transitions in the He-Ne Laser?
- kq6up
- · Replies 12 ·
Undergrad How do photons in orange light differ from those in green light?
- Jeff Root
- · Replies 16 ·
High School Entanglement, correlation and randomness
- entropy1
- · Replies 18 ·
Graduate Interaction Hamiltonian coupling question
- td21
- · Replies 1 ·
Undergrad Why does a sum of operators act on the state like this?
- Harry Smith
- · Replies 6 ·
Undergrad Is this Quantum non-locality set-up right?
- RockyMarciano
- · Replies 20 ·
Undergrad Is Schrodinger's Cat Experiment Possible with Young's Slits and a Switch?
- wywong
- · Replies 8 ·
Undergrad The speed of light in a medium and path integrals
- Seanra
- · Replies 1 ·
Undergrad Do operators that commute also indicate if their powers commute?
- TheCanadian
- · Replies 11 ·
Undergrad Birgit Dopfer interference experiment
- Dadface
- · Replies 5 ·
Undergrad QM objects do not have properties until measured?
- N88
- · Replies 138 ·
Undergrad Why does e^(-iωt) satisfy the energy eigenvalue equation?
- Isaac0427
- · Replies 13 ·
Undergrad What Causes a Measurement to Change the State of a System in Quantum Mechanics?
- Kara386
- · Replies 1 ·
Undergrad Quantum entanglement and parallel displacement
- Adel Makram
- · Replies 34 ·
High School Difference between quantum tunneling and classical tunneling
- houlahound
- · Replies 1 ·
Undergrad How are Mixed State Ammonia Molecules Separated by an E-Field?
- kq6up
- · Replies 8 ·
Graduate What is the correct reply on Einstein`s thought experiment?
- Adel Makram
- · Replies 14 ·
Undergrad Understanding Quantum Numbers and Symmetry Algebra for Keplerian Motion
- gerald V
- · Replies 2 ·
Undergrad 1 pm de Broglie wavelength? What's pm?
- alv
- · Replies 1 ·
Graduate Asymptotic momentum eigenstates in scattering experiments
- spaghetti3451
- · Replies 6 ·
Graduate Why must an ensemble have uniform probability distribution at equilibrium?
- bananabandana
- · Replies 231 ·
High School Is QM an Intrinsic Physical Theory?
- Einstein's Cat
- · Replies 2 ·
Undergrad Does violation of Bell's Inequality imply a preferred frame
- Jimster41
- · Replies 21 ·
Graduate Proof of Lorentz invariance of Klein-Gordon equation
- spaghetti3451
- · Replies 4 ·
Graduate Calculation of S-matrix elements in quantum field theory
- spaghetti3451
- · Replies 1 ·
High School IBM’s new five-qubit universal quantum computer
- Spinnor
- · Replies 6 ·
Graduate Basic strong Zeeman effect question
- vaart
- · Replies 4 ·
Undergrad Solving for SHM Diatomic Energy Levels
- James Brady
- · Replies 2 ·
Graduate Crystal field when inversion is absent
- ftft
- · Replies 4 ·
Undergrad Why don't we use the Schrodinger Uncertainty Principle?
- Joker93
- · Replies 19 ·
Undergrad Possible measurements of z-component of angular momentum
- Fosheimdet
- · Replies 2 ·
Undergrad Does a clock and observer inside the box resolve Schrödinger's cat?
- student34
- · Replies 21 ·
Undergrad Wilsonian viewpoint and wave function reality
- atyy
- · Replies 141 ·
Undergrad Second quantization and creation/annih. operators
- Swamp Thing
- · Replies 3 ·
High School Quantum Model of Contact Forces
- greswd
- · Replies 25 ·