quantum

  1. Wave-Particle Duality: Particles exhibit both wave-like and particle-like properties, depending on the experimental setup.

  2. Quantum Superposition: A quantum system can exist in multiple states at once until it is measured.

  3. Quantum Entanglement: Particles can become entangled, such that the state of one (no matter the distance) instantaneously affects the state of the other.

  4. Heisenberg Uncertainty Principle: It is impossible to simultaneously know both the exact position and exact momentum of a particle.

  5. Schrödinger's Cat Paradox: A thought experiment that illustrates the concept of superposition at the macroscopic level, questioning when and how quantum systems collapse to a single state.

  6. Quantum Tunneling: Particles can pass through barriers that would be insurmountable according to classical physics.

  7. No-Cloning Theorem: It is impossible to create an identical copy of an arbitrary unknown quantum state.

  8. Bell's Theorem: Demonstrates that no theory of local hidden variables can reproduce all the predictions of quantum mechanics, challenging the notion of local realism.

  9. Delayed Choice Experiment and Quantum Eraser: Experiments that challenge the classical concepts of causality and the determinacy of the past.

  10. Quantum Decoherence: Provides an explanation for the transition from quantum to classical behavior, explaining why quantum superpositions are not observed macroscopically.

  11. Copenhagen Interpretation: The traditional interpretation that posits a wave function collapse upon observation, separating the quantum world from the classical world through measurement.

  12. Many-Worlds Interpretation: Suggests that all possible outcomes of quantum measurements are physically realized in some "world" or universe.

  13. Relational Quantum Mechanics: Proposes that the properties of quantum systems are relative to the observer, challenging the concept of absolute states.

  14. QBism (Quantum Bayesianism): An interpretation that views the quantum state as a representation of an observer's knowledge of the system, rather than the physical state itself.

  15. Objective Collapse Theories: Suggest that wave function collapse is an objective physical process, occurring without observation.

  16. Pilot-Wave Theory (de Broglie-Bohm Theory): Suggests that particles have definite paths determined by a guiding wave, providing a deterministic framework for quantum phenomena.

  17. Quantum Contextuality: The property that the outcome of a measurement cannot be predicted independently of the context of the measurement, challenging classical notions of non-contextuality.

  18. The Measurement Problem: The problem of how (or whether) wave function collapse occurs, bridging the gap between the quantum and classical worlds.

  19. Entropic Gravity: Suggests that gravity arises from informational/entropic forces, relating to quantum theory through the holographic principle.

  20. Quantum Information Theory: Explores the concept that information is fundamental and physical, with quantum computation and quantum communication providing practical applications.

  21. Holographic Principle: Suggests that the description of a volume of space can be thought of as encoded on a lower-dimensional boundary to the region.

  22. Quantum Field Theory: The framework for constructing quantum mechanical models of subatomic particles in particle physics and quantum chromodynamics.