Unit 5 · Entanglement & Reality
Chapter20
Quantum Entanglement
Two particles, one story — Einstein's 'spooky action at a distance'
Quantum Academy · presented by Dr. Quincy Quantenstein
CH 20X–Y
0:00 / 38:52OpeningTitle
Watch the lesson · Unit 5: Entanglement & Reality
Quantum Entanglement
Two particles, one story — Einstein's 'spooky action at a distance'
- ≈ 39 min
- 58 scenes
- Narrated by Dr. Q
- Captions
Generated from the same script as the written lesson, so every word matches the text. Uses your device's voice when it has one; without one, the lesson plays silently with captions. Keys: Space play · ← → scenes · C captions · F full screen.
By the end you'll be able to
- Define an entangled state and prove that the Bell state |Φ+⟩ cannot be written as a product of single-particle states.
- Explain how entangled pairs combine perfect correlation at matched settings with complete randomness in each local outcome, and distinguish this from classical correlation.
- Reconstruct the 1935 EPR argument and define a local hidden-variable theory.
- Calculate correlations as a function of analyser angle: coincidences following cos²θ for entangled photons and E = −cos θ for spin singlets.
- Show why entanglement cannot transmit messages, and describe how spontaneous parametric down-conversion makes entangled photons.
- Describe how teleportation, cryptography and quantum computing use entanglement as a resource.