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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

A Understanding Barandes' microscopic theory of causality
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Insights A Beginner Physics Guide to Baryon Particles
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Insights The 7 Basic Rules of Quantum Mechanics
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Insights What is the Anatomy of Compton Scattering?
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B Guidelines for Quantum Physics Forum
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A Is It Known For Sure Infinites In QFT Are Caused Using a Continuum?
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A Lesser Green's function
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I What does the product part of Laughlin wave function mean?
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I Does a qubit break interference in the double slit experiment?
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I Schrödinger equation and classical wave equation
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B New idea about wave-particle duality - looking for feedback/criticism
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I Is Maxwell's electromagnetism an effective (field) theory?
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I Why can’t photons “pile up” to eject an electron?
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I The Extended Wigner's Friend Scenarios
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Insights Quantum Entanglement is a Kinematic Fact, not a Dynamical Effect
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A I have some naive questions about the Reeh-Schlieder theorem
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I Do ensemble-based predictions truly describe real finite systems?
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I How strong is the justification for low probability extreme thermal fluctuations?
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B Is a table levitating possible, even at a minuscule probability?
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I Energy*time uncertainty for particle decay
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I Commutation of operators for particle in a box
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I Need Help on Particle Spin
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I Quantum Entanglement and Synchronization
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I Electron energy in atoms
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A What is the connection between entanglement and the no-cloning theorem?
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B Two/three photon absorption chemical substance producing photons for electricity generation
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B Quantum entanglement
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I Quantum behaviour of an electron around a positively charged sphere
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I Visual depiction of atomic orbitals
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B Can gravitons be detected?
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I Bloch Sphere generalization for more than one qubit
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I Probabalistic determination Photon Entaglement
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I Commutator of x and p in quantum mechanics
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A Physical properties of the vacuum in GR vs. QFT
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A Confusion about creation/annihilation operators with interaction
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B Schrödinger's cat question
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A Eigenstates of the Klein Gordon Field Operator
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I Direction of time-evolution in time reversed wave functions
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A Angular momentum uncertainty principle and the particle on a ring
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A Effects of perception
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I Emission probability in blackbody spectrum derivation
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I Phase and group velocity for the wave function
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I Validity of identical eigenfunction of commutating operators
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I Action of an Hermitian unitary operator member of SU(2)
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I About concept of wave-particle duality
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I Hydrogen 21 cm line time?
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I I would like some assistance working with commutators
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I Shape of wave function (probability distribution) of a single photon
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I Would gravitons theoretically act like photons?
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A Baryon CP Violation Observed at CERN
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A Geometry Topology and Physics: Nakahara, Chapt. 1: Weyl Ordering
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B Energy-time uncertainty relation for a volume and macroscopic objects?
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A What happens when an operator maps a vector out of the Hilbert space?
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B The wave function of the electron doesn't collapse when passing through air?
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I New book on algebraic quantum physics
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I A question about density matricies
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I Density matrix representation of a density operator
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I How to understand quantum computers?
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I Bose-Einstein statistics and the Photon
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A Explicit construction of Galilean-invariant space
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I Addition of angular momenta
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I Quantum decoherence vs. measurement process
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I Quantum eraser experiment
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A Can scattering experiment be used to determine location and momentum of an electron?
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Insights Quantum Computing for Beginners
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I Bob and Alice with a Bell pair
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B Gravitons vs photons: Does the size of the atom make any difference?
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I What's the deal with instantons?
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I How to derive orbital angular momentum of spins in quantum mechanics?
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I Deriving Bogoliubov transformations correctly
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I Dirac's 1972 Boston talk on Projective geometry in quantum mechanics
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B Feynman QED Questions
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A Scattering cross section between charged particle and magnetic moment
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I More information on the momentum eigenstate in the position basis
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I Measurement problem - will this work?
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I Quantum wavelength in gravitation
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A Pauli–Villars ghost fields?
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A Magnetic field produced by moving charge in operator form
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I Tensor products and simultaneous eigenstates
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I Molecular Quantum Computer Progress
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I Coherence time for repeated spin measurements
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A John Bell 1964 toy model for spin
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B Thought experiment: Beyond the slowest measurable speed?
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I Black Hole Fermion Count
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I Free Schroedinger equation: time separation
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I I would like an explanation of these extra energy states
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A Causality in QFT
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B General question about series limits and strong lines of the emissions spectrum
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A Time Reversal and initial conditions
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I Choice of basis in BB84 protocol
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I Time dependent Hamiltonian and energy
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I I want to understand how the transmission coefficient is obtained
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I Postulate of only time dependence on |ψ⟩
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I When is Â(r) Ψ(r) = ⟨r | Â | Ψ⟩?
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I A short attenuated laser pulse, LIGO, and a fast detector
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I Using a single particle as quantum computer
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B Bell's Inequalities and the issue of non-locality
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I Mean values of observables
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A Bell's inequality and experiment
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I States and observables in quantum mechanics
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I Passing information faster than speed of light
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I Energy and momentum in quantum mechanics
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B Double-slit with movable detector screen
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I QED replacing photon field with current in 3-point function
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I Expansion of position kets in terms of angular momentum
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Quantum Physics

Quantum physics, or quantum mechanics, is a branch of physics that explores the behavior of matter and energy at the smallest scales, where classical physics principles break down. It introduces the concept of quantization, suggesting that certain properties, such as energy levels, are quantized and can only exist in discrete values.

Quantum mechanics encompasses wave-particle duality, where particles like electrons exhibit both wave and particle characteristics. The theory is probabilistic, relying on probability amplitudes to predict outcomes, and features phenomena like superposition, where particles can exist in multiple states simultaneously.

Quantum physics has transformed our understanding of the microscopic world, leading to technologies like transistors and lasers, and continues to provoke profound questions about the nature of reality and the role of observation in shaping it.

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