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 Confusion over spin measurements
- etotheipi
- · Replies 2 ·
Undergrad What is a photon?
- bhobba
- · Replies 95 ·
Graduate Is quantum theory a microscopic theory?
- Demystifier
- · Replies 232 ·
High School Speed of light with quantum path integrals
- Sophrosyne
- · Replies 3 ·
Graduate Representation of Super-Quantum probability
- DarMM
- · Replies 1 ·
Undergrad Wave-particle duality revisited: Neither wave nor particle
- A. Neumaier
- · Replies 3 ·
High School Quantum microphone and phonons
- Solomei
- · Replies 5 ·
High School The Human Eye as a Detector in Double-Slit Experiment
- Graeme M
- · Replies 5 ·
Undergrad God plays dice, stochastically and deterministically.
- N88
- · Replies 1 ·
High School Locality and time in quantum mechanics versus QFT
- Lynch101
- · Replies 6 ·
Undergrad Can you locally tell that a measurement you made was entangled?
- PAllen
- · Replies 9 ·
Undergrad Multiplying two function operators
- Pencilvester
- · Replies 10 ·
Undergrad Standard deviation of the Hamiltonian?
- Kyle Nemeth
- · Replies 2 ·
Graduate Matrix transmission coefficient
- amjad-sh
- · Replies 1 ·
Undergrad Is the Quantum State Holographic?
- lucas_
- · Replies 7 ·
Undergrad Does science disprove this person's theory?
- Rich76
- · Replies 2 ·
Undergrad What are Dirac's gamma matrices and do they have many forms?
- pallab
- · Replies 4 ·
Undergrad Why observables are represented as operators in QM?
- MichPod
- · Replies 4 ·
Undergrad Is the Measurement Apparatus made up partly of electrons? Perhaps not.
- lucas_
- · Replies 36 ·
High School Feynman amplitude for electron-proton scattering with leptonic and hadronic tensors
- Wrichik Basu
- · Replies 4 ·
Undergrad Should physics ban the terms 'realist' and 'anti-realist'?
- lucas_
- · Replies 11 ·
Undergrad What is the Meaning of the Schrödinger Equation?
- iaM wh
- · Replies 11 ·
Undergrad Isn't the local no-hidden-variable theory inconsistent with standard QM?
- OldBeginnings
- · Replies 7 ·
Undergrad Problem with the idea of identical particles in QM
- QuasarBoy543298
- · Replies 9 ·
Undergrad Where to publicise some notes on quantum mechanics
- Peter Hearty
- · Replies 21 ·
Undergrad Minimum excitations in interacting quantum fields
- asimov42
- · Replies 8 ·
Undergrad Trying to understand entanglement and "dense coding"
- Avner
- · Replies 2 ·
Graduate What is the difference between quantum computers and quantum accelerators?
- jumanji
- · Replies 4 ·
Graduate How can infrared divergences in the fermion propagator be cured in QED?
- Jamister
- · Replies 1 ·
Undergrad Understanding Operators in Matrix Mechanics
- Avardia
- · Replies 1 ·
Undergrad Does wave-function collapse convert intrinsic to conscious knowledge?
- AuntyMatter
- · Replies 1 ·
Graduate What does the first ever photo of quantum entanglement look like?
- Tom.G
- · Replies 16 ·
Undergrad Momentum operator in quantum mechanics
- adosar
- · Replies 5 ·
Undergrad Trying to understand electron orbitals
- dsaun777
- · Replies 4 ·
Graduate Is time irrelevant in quantum mechanics?
- member 648030
- · Replies 3 ·
Undergrad What does U\dagger H U represent?
- Haorong Wu
- · Replies 2 ·
High School FTL Communication: Closing Bell Test Loopholes for Quantum Integrity
- Alex Towers
- · Replies 19 ·
Undergrad Let's talk about the classical limit of QM
- andresB
- · Replies 13 ·
Undergrad How to use a quantum bit, or several
- bkelly13
- · Replies 1 ·
Undergrad When ℏ=1, does the wave vector K equal the momentum p?
- amjad-sh
- · Replies 16 ·
Undergrad Can ambiguity in the word "measurement" allow contradictions in QM?
- msumm21
- · Replies 5 ·
Undergrad Finding Normalization Constants for a Set of Energy Eigenstates
- jaurandt
- · Replies 2 ·
Graduate Tensor and vector product for Quantum
- MrMuscle
- · Replies 7 ·
Undergrad Replace a Toffoli gate with an equivalent circuit
- Peter_Newman
- · Replies 2 ·
High School Multiple Histories theory by Richard Feynman
- Rosegoldtaken
- · Replies 10 ·
High School Can quantum entangled particles be split and sent into a black hole
- Benfield
- · Replies 9 ·
Undergrad Why can't we localize particles in relativistic quantum mechanics?
- WWCY
- · Replies 61 ·
Graduate How does a polarising filter work?
- cmb
- · Replies 13 ·
Graduate Correlation function of a Klein-Gordon field
- Gaussian97
- · Replies 4 ·
Undergrad Why does measuring one child particle determine the other in spin conservation?
- imsmooth
- · Replies 3 ·
Undergrad Young physicist in seek of guidance
- Ringo Hendrix
- · Replies 1 ·
Undergrad Viewing the wave properties of a macroscopic object
- Boltzman Oscillation
- · Replies 10 ·
Undergrad When exactly did 'quantum fluctuations' in the early universe occur?
- MJM
- · Replies 3 ·
Undergrad What is the range of natural photon frequencies?
- dsaun777
- · Replies 6 ·
Undergrad In which cases does superposition lead to splitting of worlds?
- entropy1
- · Replies 16 ·
Undergrad Quantum Causal Modelling: Mathematics
- WWCY
- · Replies 1 ·
Undergrad Why are experimental tests of quantum foundations so scarce?
- ftr
- · Replies 25 ·
Undergrad Do wave functions describe real interactions between molecules or just predictions?
- lucas_
- · Replies 6 ·
Graduate [Quantum Optics] "quantumness"
- microsansfil
- · Replies 9 ·
Undergrad Any EM-field in terms of photon
- olgerm
- · Replies 35 ·
Insights How Does the EPR-Paradox Relate to Entanglement and Nonlocality?
- jfizzix
- · Replies 12 ·
High School How does the Higgs field “Give mass”?
- lindl
- · Replies 7 ·
Graduate Is Quantum Information Theory the Only Way to Handle Multipartite Entanglement?
- Mordred
- · Replies 1 ·
High School Is the MDPI entropy article's criticism of Bell test experiments valid?
- Collin237
- · Replies 3 ·
Undergrad Is the Wheeler-DeWitt equation somehow related to the Multiverse?
- Suekdccia
- · Replies 2 ·
Undergrad Matrix Representation of an Operator (from Sakurai)
- jaurandt
- · Replies 7 ·
Undergrad Questions about an optical photon quantum computer
- Haorong Wu
- · Replies 2 ·
Undergrad Neutron Star Cores: Study Quantum Gravity Effects?
- KevinMcHugh
- · Replies 2 ·
Undergrad What is the current experimental evidence for quantum trajectory theory?
- Demystifier
- · Replies 14 ·
Undergrad Born's rule, causality, and the Dirac equation
- akhmeteli
- · Replies 17 ·
High School Can macroscopic bodies be in superposition?
- bhanum
- · Replies 46 ·
Undergrad Notation for vectors in tensor product space
- hilbert2
- · Replies 17 ·
High School Cherenkov radiation double slit experiment
- DARKSYDE
- · Replies 6 ·
Undergrad Measurement with respect to the observable Y
- Peter_Newman
- · Replies 2 ·
Undergrad In quantum search algorithm, how to interpret the effect of U(t)？
- Haorong Wu
- · Replies 4 ·
Undergrad Objective Wave Function and Non-locality
- lucas_
- · Replies 33 ·
Undergrad Quantum Gravimeter: Exploiting the Born rule
- my_wan
- · Replies 1 ·
Undergrad How to Determine a Photon's Wavefunction After it Collapses?
- Flamel
- · Replies 4 ·
Graduate What quantum effects that involve gravity can be studied without QFT?
- andresB
- · Replies 5 ·
Graduate Jürg Fröhlich on the deeper meaning of Quantum Mechanics
- A. Neumaier
- · Replies 230 ·
Graduate What is a random quantum walk and how are they used with quantum gates?
- Frank Schroer
- · Replies 1 ·
Undergrad Relating Ward identity from path integral to propagator contractions
- HomogenousCow
- · Replies 1 ·
Undergrad Some questions in QFT (EM vertex, Ward identity, etc.)
- Wrichik Basu
- · Replies 5 ·
Undergrad Quantum Computing - projection operators
- Peter_Newman
- · Replies 16 ·
High School From where did the ##ie\gamma## come into the picture? (QED)
- Wrichik Basu
- · Replies 7 ·
Graduate Recent paper on QED using finite-dimensional Hilbert space - validity?
- asimov42
- · Replies 3 ·
Graduate Is the Wheeler-DeWitt equation related to Wheeler's It from Bit?
- Suekdccia
- · Replies 8 ·
Undergrad Impact of atmospheric turbulence on secret key rate in QKD
- Nur Ziadah
- · Replies 2 ·
High School Quantum Entanglement Violates the Laws of Physics
- JustThinking
- · Replies 3 ·
High School Probability of finding a particle
- Anonymous1212144
- · Replies 10 ·
Undergrad Would this experiment disprove that consciousness causes collapse?
- john taylor
- · Replies 35 ·
High School General form of electromagnetic vertex function in QFT
- Wrichik Basu
- · Replies 1 ·
Graduate What topics in Quantum Gravity don't require QFT or string theory?
- andresB
- · Replies 1 ·
Undergrad How Does Quantum Field Theory Address Zeno's Paradox of Touch?
- Philipsmett
- · Replies 5 ·
Graduate How Does Qubit Orientation on the Bloch Sphere Indicate Quantum States?
- *FaerieLight*
- · Replies 2 ·
High School Can the Schrödinger equation show electron probability during atomic transitions?
- johann1301h
- · Replies 4 ·
Graduate What is the relationship between MHD waves and the Korteweg de Vries equation?
- math04
- · Replies 1 ·
Graduate The Higgs Field, constant velocity, and the acceleration of particles
- e2m2a
- · Replies 1 ·
High School Does the principle of least action determine where particles are detected?
- Andy_K
- · Replies 2 ·
Undergrad Second-quantised interaction potential in Blundell's QFT
- WWCY
- · Replies 2 ·