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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

I Is there a bad intuition or bad explanation in quantum entanglement?
I Can a Hamiltonian with non-spherical potential commute with l^2?
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QFT question about using momentum raising and lowering operators
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A Functional Determinant of a system of differential operators?
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B Quantum Tunneling different individual transmission probabilities
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I Spin in Real Space: Meaning of Z-Component
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A Converting between field operators and harmonic oscillators
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I Schrodinger equation on the complex disk
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I The wave function in the finite square well
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I Understanding the Role of Space Energy Propagator in Quantum Field Theory
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I On 1/2 spin - which is the X axis?
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I Confusion about position state kets
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A 2-electron system under compression
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A Absorption of an Exciton and Exciton propagation
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A How to calculate the interband velocity matrix in a graphene system
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I Quantum operators and trasformation under rotations
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I Explaining atoms and bonding using entropy
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I Matrix Representations of the Poincare Group
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A Concurrence as a measure of entanglement
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I Using general relativity to violate the uncertainty principle
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I Double Slit Interference Question
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I Double Slit Interference Question II
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A Quantum computers and Annular Josephson junctions
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I Double Slit Experiment Question
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I Double slit-experiment confusion
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B Can entangled electrons in helium be observed and measured in practice?
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B Understanding Photon in a Box: Eigenmodes, Reflection, and Energy Measurement
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I Why isn't the Goldstone boson on the Standard Model map?
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I Really? Schrödinger's cat again?
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I Why is the speed of photons different?
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A Quantum finance equation explanation please
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I Is Quantum Mechanics Infinitely More Complex than Classical Mechanics?
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I Lorentz violation, multiple preferred frames, vacuum energy
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I Physicists entangle 15 trillion hot atoms
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I Struggling with one step to show quantum operator equality
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A Ground state energy of a particle-in-a-box in coordinate scaling
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A What is the cause of radioactive decay?
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I A question about operator power series
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I What happened to the spatial degrees of freedom for the second particle?
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I Question about this "Quantum laser pointer" that I bought
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I QED on electromagnetic interactions in atoms
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I Is it possible for non-spherical atomic orbitals to have spherical symmetry?
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A Contribution of vacuum fluctuation to the self-energy of the electron
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A Hartle-Hawking sum over all possible metrics?
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I Question about simultaneous measurement
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I Understanding how to get the unpolarized cross-sections
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I Maximum violation of Bell's Inequalities?
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A Can Quantum Mechanics Calculate the Frequency of an Atomic Clock?
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B Bell's theorem, QFT, and the Relativity of Simultaneity
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A Quantum Period is Compression Robust
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A Positive polarity of a retarded Green's function's imaginary part
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I Seeking better explanation of some quantum stats formulae
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A Question: Unambiguous discrimination between two non-orthogonal states
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I Feynman's Lectures volume III (Ch:8) -- Resolution of vector states
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I Partition function of quantum mechanics
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I Clebsch–Gordan coefficients: An Identity
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B What happens to the uncertainty principle if....
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I Probability of finding a particle in a 1-D box max. at centre?
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B Compressing Light: Reflection in Small Gaps
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I Quantum Field Operators for Bosons
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B Question about notation in the Feynman Lectures on Physics III 3-1
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B Why are protons allowed in the nucleus?
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B Uncertainty versus impossibility of measurement
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I Can the spin cause the collapse?
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A Should tensor sum be used in matrix mechanics?
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I Many-Worlds Theory: Simulation Program in C#
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I Invariance of a system under symmetry operations
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B Virtual Particles are not Dark Matter?
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I Commutator of ##L^2## with ##L_x,L_y,L_z##...
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A Understanding how to derive the differential cross-section formula
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I The period-finding circuit for Shor's algorithm
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B What Is the Occurrence Rate of Path Integral in a Photon Double-Slit Experiment?
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A Off-diagonal elements in a density matrix
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A Relation between Dirac's equation density matrix and current with spin
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Insights Clarifying Common Issues with Indistinguishable Particles
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I Fermi's Golden Rule and the S-matrix
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I Could Planck-Einstein relation be applied to matter waves?
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A Zero-point Energy Contribution Below the Planck energy cutoff
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I Understanding the Relationship Between Photon Spin and Polarization Vectors
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I Could Quantum Physics explain the singularity in a Black Hole?
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30-day Topological Quantum challenge
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B Question about squares of operators
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I Quantum Spin: Is it Random? Alice & Bob's Test
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I Photon Interaction with Environment at Long Range
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I Obtaining the Dirac function from field operator commutation
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B Is Inverse Compton Scattering Related to the Doppler Effect?
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I Can atoms absorb photons with energy higher than transition energy?
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A Could the fields for the particles and forces have the same origin?
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I QFT - Field operator commutation
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I Physical meaning of the highest root / weight
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I Interference of a fat laser beam: Tilting wave peaks
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A Quantum Mechanic/wave function/junction condition
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I Single photon double slit experiment
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Insights Massive Meets Massless: Compton Scattering Revisited
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I Perturbation Theory and Zeeman Splitting
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I Visualising an alternative formulation of Planck's Radiation Law
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A Exclusion principle in Helium 3
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B Mapping between rules of classical vs QM probability?
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I Single Photon Double Slit Experiment
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I Quantum Computing: How are quantum properties exploited?
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A Quantum Field Theory: 3-4 Equation Steps Explained
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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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