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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

Insights Why Entangled Photon-Polarization Qubits Violate Bell’s Inequality
I Schrödinger equation and classical wave equation
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I Is Maxwell's electromagnetism an effective (field) theory?
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107
I Why can’t photons “pile up” to eject an electron?
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3
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122
I The Extended Wigner's Friend Scenarios
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I Do ensemble-based predictions truly describe real finite systems?
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118
I How strong is the justification for low probability extreme thermal fluctuations?
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6
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136
I Energy*time uncertainty for particle decay
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27
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233
I Commutation of operators for particle in a box
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16
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207
I Need Help on Particle Spin
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3
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119
I Quantum Entanglement and Synchronization
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6
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168
I Electron energy in atoms
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10
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279
I Does a qubit break interference in the double slit experiment?
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9
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163
I Quantum behaviour of an electron around a positively charged sphere
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18
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316
I Visual depiction of atomic orbitals
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12
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297
I Bloch Sphere generalization for more than one qubit
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249
I Probabalistic determination Photon Entaglement
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152
I Commutator of x and p in quantum mechanics
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4
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243
I Direction of time-evolution in time reversed wave functions
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424
I Emission probability in blackbody spectrum derivation
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1
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211
I Phase and group velocity for the wave function
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14
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768
I Validity of identical eigenfunction of commutating operators
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281
I Action of an Hermitian unitary operator member of SU(2)
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15
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375
I About concept of wave-particle duality
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11
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411
I Hydrogen 21 cm line time?
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5
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212
I I would like some assistance working with commutators
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220
I Shape of wave function (probability distribution) of a single photon
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16
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506
I Would gravitons theoretically act like photons?
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2K
I New book on algebraic quantum physics
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6
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2K
I A question about density matricies
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7
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433
I Density matrix representation of a density operator
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8
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1K
I How to understand quantum computers?
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9
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2K
I Bose-Einstein statistics and the Photon
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1
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877
I Addition of angular momenta
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488
I Quantum decoherence vs. measurement process
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3
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394
I Quantum eraser experiment
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476
I Bob and Alice with a Bell pair
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3
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455
I What's the deal with instantons?
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428
I How to derive orbital angular momentum of spins in quantum mechanics?
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2
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494
I Deriving Bogoliubov transformations correctly
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12
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1K
I Dirac's 1972 Boston talk on Projective geometry in quantum mechanics
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7
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589
I More information on the momentum eigenstate in the position basis
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1
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567
I Measurement problem - will this work?
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4
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2K
I Quantum wavelength in gravitation
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6
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690
I Tensor products and simultaneous eigenstates
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577
I Molecular Quantum Computer Progress
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2K
I Coherence time for repeated spin measurements
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9
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1K
I Black Hole Fermion Count
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1
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801
I Free Schroedinger equation: time separation
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3
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723
I I would like an explanation of these extra energy states
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3
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817
I Choice of basis in BB84 protocol
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2
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723
I Time dependent Hamiltonian and energy
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2
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783
I I want to understand how the transmission coefficient is obtained
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3
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803
I Postulate of only time dependence on |ψ⟩
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2
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787
I When is Â(r) Ψ(r) = ⟨r | Â | Ψ⟩?
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2
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857
I A short attenuated laser pulse, LIGO, and a fast detector
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1
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793
I Using a single particle as quantum computer
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8
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904
I Mean values of observables
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2
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997
I States and observables in quantum mechanics
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5
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945
I Passing information faster than speed of light
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20
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1K
I Energy and momentum in quantum mechanics
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8
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1K
I QED replacing photon field with current in 3-point function
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974
I Expansion of position kets in terms of angular momentum
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5
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880
I Particle field strength and sensitivity
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763
I Heisenberg uncertainty principle and the canonical momentum operator
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32
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3K
I More double slit experiment questions
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4
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1K
I Matrix element involving raising/lowering operators
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10
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I Confused about a matrix element
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1
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991
I Position operator explicit form
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9
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1K
I Commutation of position operators in three dimensions
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14
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1K
I Qubit two-state quantum system
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29
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2K
I Another Interferometry question please
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5
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972
I Can Topological Protection Extend the Lifetime of a Qubit?
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6
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2K
I Relation between operators and their variables' signs
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13
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1K
I Incomprehension of a simple interferometer?
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17
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1K
I Double-dark Slit Interference Pattern?
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I What kind of integration is Berezin integration?
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7
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1K
I Please help me understand the double slit experiment and conclusion
2
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I Understanding the proof of Goldstone theorem
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4
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1K
I Quick question regarding creation/annihilation operators
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899
I Homemade double slit experiment
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11
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I Have You Heard of the SEW Experiment? Thoughts?
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3
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I Clarifying the Superposition Principle
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8
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I The physical components in the electron double slit experiment
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7
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I Femto-photography Michelson Morley Interferometer thought experiment
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I Quantum fields and "mediator" particles
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7
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I Entropic Tension Cosmology (ETC) 1.0
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6
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I Quantum Gravity
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5
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I Far off resonant Rabi oscillations in a 2 level system
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983
I Different expressions about time reversal and confusion
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I Is the result of an operator acting on a ket vector always a ket？
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I Double Slit Experiment: Measurement versus Observation
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I Deriving the time-dependent wave equation from Energy eigenfunctions
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I How Much Pressure To Cause Matter To Degenerate?
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11
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I Particle in Infinite Square Well
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I Particle in a potential well
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I Feynman's summing arrows for photon amplitudes applied to LIGO?
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I Laws of thermodynamics and their application to quantum physics
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I Explanation of the Bohr postulates' existence
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I Can two photons combine to give a local field with spin 2?
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I Physical Meaning of Atomic Oscillations
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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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