# Entanglement (DD-080)

> In quantum mechanics, entangled particles share a single quantum state, so measurements on them are correlated no matter how far apart they are. The correlations appear instantly, but they cannot be used to send information faster than light. Albert Einstein, who doubted the idea, called it 'spooky action at a distance.' Experiments have repeatedly confirmed entanglement, work recognized by the 2022 Nobel Prize in Physics.

- Department: Science
- First published: 2023-11-14
- Last updated: 2023-11-14
- Permalink: https://detailenjoyer.com/case/entanglement/
- Author: Marcus Easterling (DetailEnjoyer), The Detail Department

## On the timeline

- **2022**: Nobel Prize in Physics awarded for entanglement experiments

Full timeline: https://detailenjoyer.com/timeline/?case=entanglement

## Quick facts

- **DD-080-F01**: Entangled particles share a quantum state. _(Write-up · Exhibit A (Shared state))_
- **DD-080-F02**: Measurements are correlated at any distance. _(Write-up · Exhibit B (Correlated))_

## Write-up

Entangled particles stay correlated however far apart they are. Einstein called it 'spooky action at a distance.'

1. **Shared state**: Entangled particles share a quantum state.
2. **Correlated**: Measurements are correlated at any distance.
3. **No signaling**: It cannot send information faster than light.
4. **Spooky**: Einstein called it spooky action.
5. **Nobel**: Entanglement experiments won the 2022 Nobel.

## Related case files

- [Quantum Shenanigans (DD-338)](https://detailenjoyer.com/case/quantum-shenanigans/): I linked more quantum physics

## Reel vs. record

- **Note**: The Reel says changing one particle instantly influences its partner; the measurement results are correlated, but no signal or information travels faster than light.

## Video: Entanglement: Entangled Particles Stay Correlated However Far Apart They Are

- Duration: 37.3 s · Published: 2023-11-14
- File: https://detailenjoyer.com/assets/videos/CzolGSyuFcm.mp4

### Transcript

Did you know, in quantum mechanics, particles can become entangled, which means the state of one particle is directly related to the state of another, regardless of the distance between them. Okay, here's why this is really cool. This connection seems to occur instantaneously, even faster than the speed of light. Even if entangled particles are separated by vast distances, changing the state of one particle will instantaneously influence the state of the entangled partner. This phenomenon challenges our classical understanding of cause and effect, and has been famously referred to by Albert Einstein as, spooky action at a distance. NOW YOU KNOW!

## Questions & answers

**Q: What do entangled particles share?**  
A: One state. _(Source: Write-up · Exhibit A (Shared state) · Wikipedia: Quantum entanglement)_

**Q: Does distance break the correlation?**  
A: Any distance. _(Source: Write-up · Exhibit B (Correlated) · Wikipedia: Quantum entanglement)_

**Q: Can it send messages faster than light?**  
A: No signaling. _(Source: Write-up · Exhibit C (No signaling) · Wikipedia: Quantum entanglement)_

**Q: What did Einstein call it?**  
A: He was skeptical. _(Source: Write-up · Exhibit D (Spooky) · Wikipedia: Quantum entanglement)_

**Q: Which year's Nobel honored this work?**  
A: Aspect, Clauser and Zeilinger. _(Source: Write-up · Exhibit E (Nobel) · NobelPrize.org: The Nobel Prize in Physics 2022)_

## Sources

- [Wikipedia: Quantum entanglement](https://en.wikipedia.org/wiki/Quantum_entanglement)
- [NobelPrize.org: The Nobel Prize in Physics 2022](https://www.nobelprize.org/prizes/physics/2022/summary/)

## Cite this case file

Easterling, Marcus. "Entanglement." The Detail Department (DetailEnjoyer), case file DD-080, last updated Nov 14, 2023. https://detailenjoyer.com/case/entanglement/