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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.

Quantum Interpretations and Foundations

On computing quantum waves exactly from classical action
1.3K threads
Undergrad On computing quantum waves exactly from classical action
Undergrad Meaning of eigenvalue of projection operator/projector
  • LightPhoton
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Undergrad Counting Total Spin for N Two-Level Systems (TLS)
  • Haris
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Graduate Representation in second quantization
  • hokhani
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7
High School In QFT, do Fermion fields belonging to distinguishable particles commute or anti commute?
  • Paul Colby
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19
Undergrad Born rule as an axiom or as a theorem?
  • nomadreid
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7
High School A stupidly basic question about expectation value
  • HAYAO
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8
Undergrad What Are the Key Concepts of Quantum Field Theory?
  • bhobba
  • · Replies 9 ·
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9
Undergrad Question on interference equation in a recent paper
  • msumm21
  • · Replies 8 ·
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8
Undergrad How can I estimate the K force constant for bond types without special tools?
  • Lahearle
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2
Graduate Schrodinger equation/Madelung equation phase transformation
  • binbagsss
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High School Double-slit experiment and time
  • Enlanda
  • · Replies 24 ·
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24
Graduate Acceleration in quantum mechanics
  • hokhani
  • · Replies 18 ·
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18
Undergrad Is There A Study Showing The Observer Effect Ignoring Conscious Intent?
  • Adon
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3
Undergrad Expectation value of the momentum for an electron in a box
  • Haorong Wu
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3
Graduate Seeking papers on Energy Level Diagrams for LiNO2 and O2
  • Adrian Tudini
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0
High School Quantum Superposition And A Coin
  • Agent Smith
  • · Replies 25 ·
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25
Undergrad Volume of momentum space of an ideal gas
  • LightPhoton
  • · Replies 8 ·
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8
Undergrad Meaning of the word 'particle'
  • Qwadratix
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11
Undergrad Do physically rotating particles affect Stern Gerlach results?
  • CountingKeys
  • · Replies 16 ·
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16
Graduate Polarization in a 3 level system
  • Malamala
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0
Undergrad What are the implications of this "Negative Time Experiment"?
  • James2018
  • · Replies 19 ·
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19
Graduate Question about perturbation theory
  • Malamala
  • · Replies 4 ·
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4
Graduate What is the quantum picture of laser field accelerating free electrons?
  • gaiussheh
  • · Replies 6 ·
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6
Undergrad Number of Higgs "particles" per unit volume
  • mister i
  • · Replies 4 ·
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4
Undergrad Does quantum tunnelling affect the magnitude of the Casimir Effect?
  • Eukonidor
  • · Replies 21 ·
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21
Undergrad Infinite energy from an electric field?
  • p78653
  • · Replies 12 ·
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12
Undergrad Why protective measurement is important to understand psi?
  • MichPod
  • · Replies 5 ·
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5
Undergrad My problem with time-dependent Schrodinger equation
  • wirefree
  • · Replies 6 ·
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6
High School 3 Particle entanglement
  • Isaac Hart
  • · Replies 23 ·
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23
Undergrad Calculating qubit purity/entanglement in a quantum computer
  • Bob Walance
  • · Replies 0 ·
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0
Graduate QED and photon path experiments
  • LightPhoton
  • · Replies 16 ·
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16
Graduate Interesting Paper On QFT and Quantum Measuremets
  • bhobba
  • · Replies 10 ·
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10
Undergrad The claymath 4-d QFT problem and virtual particles (as an example)
  • billtodd
  • · Replies 36 ·
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Graduate A question of separability and entanglement
  • andresB
  • · Replies 11 ·
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11
High School Can someone please explain to me the motion of an electron?
  • Musti425
  • · Replies 11 ·
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11
Undergrad Textbook proof of repulsion/attraction of equal charges according to odd/even spin
  • arivero
  • · Replies 7 ·
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7
Undergrad Are Dot Products and Dirac Brackets Interchangeable in Vector Mathematics?
  • sonnichs
  • · Replies 10 ·
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10
High School A quick question about Planck's constant
  • hongseok
  • · Replies 6 ·
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6
High School Double slit experiment wave collapse
  • Mkwglyg
  • · Replies 2 ·
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2
Undergrad The coefficient of expansion for spin addition
  • hokhani
  • · Replies 4 ·
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4
Undergrad Some notes on stochastic physics
  • ergospherical
  • · Replies 1 ·
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1
Insights Brownian Motions and Quantifying Randomness in Physical Systems
  • ergospherical
  • · Replies 1 ·
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1
Undergrad Does a certainty in the position imply infinite variation in speed?
  • Giuseppino32
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4
High School Why do photon polarization experiments show similar outcomes in different situations?
  • gohu
  • · Replies 11 ·
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11
Graduate How does QFT treat Young’s Double-Slit Experiment?
  • Quant
  • · Replies 18 ·
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18
Undergrad What's the relation between spinor space and SO(3) vector space?
  • joneall
  • · Replies 53 ·
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Graduate Computer Model for a QCL laser
  • Adrian Tudini
  • · Replies 1 ·
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1
Graduate Gravity has finite reach? (per Claudia de Rahm)
  • rolnor
  • · Replies 11 ·
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11
Undergrad Does a Sensor interact with atoms in the double slit experiment?
  • user079622
  • · Replies 17 ·
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17
Undergrad How does a photon travel?
  • Green dwarf
  • · Replies 9 ·
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9
Undergrad The components of Dirac Equation -- Bosonic Lagrangian?
  • arivero
  • · Replies 8 ·
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8
Undergrad How Does the Heisenberg Uncertainty Principle Relate to Electron Confinement?
  • walker35867
  • · Replies 16 ·
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16
Undergrad Simulation of CHSH inequality experiment in Excel
  • lostinmygarden
  • · Replies 61 ·
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Graduate Method of calculating the vacuum energy divergence
  • Haorong Wu
  • · Replies 2 ·
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2
Undergrad Vacuum decay likelihood and consequences
  • KleinMoretti
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1
Graduate Time-ordered products derivation in "QFT and the SM" by Schwartz
  • Hill
  • · Replies 5 ·
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5
Undergrad Scaling Dimension of a Field in CFT
  • shinobi20
  • · Replies 0 ·
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0
High School Does Particle System Collapse Depend on Mass, Momentum, or Complexity?
  • AndrzejB
  • · Replies 5 ·
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5
Graduate Calculating higher order terms for Electron Anomalous Magnetic Moment
  • Adrian59
  • · Replies 6 ·
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6
Undergrad FTL signals connected to a previous non-FTL discussion are possible?
  • ESponge2000
  • · Replies 8 ·
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8
Graduate Converting momentum sums to integrals in curved spacetime
  • KariK
  • · Replies 1 ·
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1
Undergrad Laser interference pattern flickering
  • basiler
  • · Replies 1 ·
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1
High School Can the probabilities of state vectors |r⟩ and |i⟩ be determined from |ψ⟩?
  • hongseok
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2
Undergrad Tips on generating entangled photon pair with SPDC entanglement source
  • PokemanDude
  • · Replies 1 ·
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1
High School Is it possible to apply thermodynamics to magnetic/weak/nuclear fields
  • Ignorantsmith12
  • · Replies 2 ·
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2
Undergrad Will all objects in the Universe transform into black holes through quantum tunneling?
  • Suekdccia
  • · Replies 7 ·
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7
High School Gluons turning into quarks and antiquarks
  • PotatoMan
  • · Replies 8 ·
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8
Undergrad Laser interference fringes fading in and out of view
  • PokemanDude
  • · Replies 30 ·
2
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30
Undergrad Four Questions on vacuum phase transitions in the Universe...
  • Suekdccia
  • · Replies 29 ·
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29
High School Determining Electron's Momentum and Position Simultaneously
  • lisathomas
  • · Replies 4 ·
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4
Graduate Multi-scale Decoherence and the Quantum-to-Classical Transition
  • asklepian
  • · Replies 3 ·
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3
Graduate Magnetic Vorticies In Superconductors Don't Confine Electrons
  • Hornbein
  • · Replies 0 ·
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0
Graduate Going from Kronecker deltas to Dirac deltas
  • MaestroBach
  • · Replies 15 ·
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15
Undergrad Poisson spot with single photons
  • Quant
  • · Replies 35 ·
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35
Undergrad Mathematical basics of quantum mechanics
  • Spathi
  • · Replies 21 ·
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21
Undergrad Could Quantum Dots Between Optic Fibers Create Photon Interference?
  • Quant
  • · Replies 6 ·
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6
Undergrad Degenerated perturbation theory
  • Lucas-
  • · Replies 3 ·
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3
Undergrad von Neumann Measurement Scheme
  • Kyuubi
  • · Replies 2 ·
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2
Graduate Questions about scale dependence and renormalization schemes
  • Isaac0427
  • · Replies 2 ·
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2
Undergrad What is the meaning of "same direction" for spin measurement?
  • Heidi
  • · Replies 10 ·
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10
Graduate Regarding Nucleon Penetration into stationary plasma cloud
  • RatTrap85
  • · Replies 9 ·
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9
Undergrad Are certain combinations of quantum numbers (basis vectors) forbidden?
  • Happiness
  • · Replies 1 ·
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1
Graduate Comparing Information Loss: Time Dilation vs. Decoherence
  • asklepian
  • · Replies 5 ·
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5
Undergrad How to Show \(\psi_{i}\ket{\xi} = \xi_{i}\ket{\xi}\)?
  • thatboi
  • · Replies 4 ·
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4
Undergrad Will an electron release energy when it is added into an atom?
  • Sameer Tahir
  • · Replies 6 ·
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6
Graduate Is delayed choice remote entanglement of photons derived from TDSE?
  • DrChinese
  • · Replies 58 ·
2
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Graduate Hard-Core Boson Model in K space
  • partyday
  • · Replies 0 ·
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0
Undergrad Evaluating Taylor Series at the Mid-Point
  • thatboi
  • · Replies 3 ·
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3
Undergrad Why is m_j not a good quantum number in strong-field Zeeman effect?
  • Happiness
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2
High School Can energy be stored in a single particle indefinitely?
  • Suekdccia
  • · Replies 29 ·
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29
Graduate Link between Kraus operators and PVMs
  • ueu
  • · Replies 0 ·
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0
Undergrad Matrix elements of Hamiltonian include Dirac delta term
  • MaestroBach
  • · Replies 2 ·
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2
High School Could we “cheat” and send a message back in time with a measurement?
  • Maximum7
  • · Replies 7 ·
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7
High School What I don't quite get about entanglement...
  • imsmooth
  • · Replies 32 ·
2
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32
High School What does it mean for a glass bead to be in a quantum state?
  • Grinkle
  • · Replies 17 ·
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17
Insights Schrödinger’s Cat and the Qbit
  • RUTA
  • · Replies 46 ·
2
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46
Undergrad Derivation of "polarization drift" in a plasma
  • Axel Togawa
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3
Undergrad Valid to use <1/r3> to get spin-orbit correction to H? (perturbation)
  • Happiness
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5
Undergrad Measuring Second-Order Correlation Function with Start and Stop Signal
  • KjUy
  • · Replies 2 ·
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2
Graduate Do entanglement networks encode a unique, local historical record?
  • asklepian
  • · Replies 2 ·
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2