3 ms·

The way they are linked is that each particle (in this case lego) actually has no orientation until you measure it, it's in a quantum superposition. But the 2 l

The way they are linked is that each particle (in this case lego) actually has no orientation until you measure it, it's in a quantum superposition. But the 2 legos are guaranteed to have opposite orientations. One lego has orientation x, the other has !x

nomel 4y ago
> until you measure it, it's in a quantum superposition I assume it's been proved that it's in superposition, rather than in a static state? If so, how? Wouldn't knowing require measuring? Or, maybe to make myself more productive, what's a good search term for this? :)
- assetlabel 4y ago
  Bell's Theorem and the many experiments that followed allegedly prove that they couldn't have taken on any state before measurement, based on probability theory. If they had predetermined states before you measured them, there is a limit to how often an experiment could yield a certain result. But in these experiments, that limit is exceeded. Search for "bell inequality".
- armchairhacker 4y ago
  There are reliable ways to create superposition particles: when you measure in one direction, the other direction is a superposition (https://physics.stackexchange.com/questions/43974/how-can-we-create-superposition-in-qm https://physics.stackexchange.com/questions/43974/how-can-we...). I have no idea how to create entangled superposition particles: maybe read https://www.eurekalert.org/news-releases/473741 https://www.eurekalert.org/news-releases/473741. You can tell the particles are in a superposition because they behave differently than those in a static state: - Double-split experiment: https://en.wikipedia.org/wiki/Double-slit_experiment https://en.wikipedia.org/wiki/Double-slit_experiment - only particles in a superposition create interference patterns - Bell's paradox: https://www.youtube.com/watch?v=v7jctqKsUMA https://www.youtube.com/watch?v=v7jctqKsUMA, https://www.youtube.com/watch?v=hiyKxhETXd8 https://www.youtube.com/watch?v=hiyKxhETXd8 - entangled particles in a superposition can be measured to make predictions with more confidence than if they were simply static particles with different states I guess a good search term would be "Polarized light and quantum mechanics" because IMO polarized light is a good example which you can even simulate yourself if you have a polarizing filter (https://www.youtube.com/watch?v=zcqZHYo7ONs&t=736s https://www.youtube.com/watch?v=zcqZHYo7ONs&t=736s, https://www.youtube.com/watch?v=ZudziPffS9E https://www.youtube.com/watch?v=ZudziPffS9E, https://chem.libretexts.org/Bookshelves/Physical_and_Theoretical_Chemistry_Textbook_Maps/Supplemental_Modules_(Physical_and_Theoretical_Chemistry)/Quantum_Tutorials_(Rioux)/Quantum_Fundamentals/08%3A_Quantum_Principles_Illuminated_with_Polarized_Light https://chem.libretexts.org/Bookshelves/Physical_and_Theoret...)
  - ngcc_hk 4y ago
    The polarised one is really crazy as it is macroscopic and daily life.
    - denton-scratch 4y ago
      It's also dead easy to do - use a cheap laser pointer, a tinfoil cap with a pinhole, and some polarising lenses from an optician (he gave me a couple for free).
- junon 4y ago
  This is also my question/confusion.

nomel 4y ago

> until you measure it, it's in a quantum superposition I assume it's been proved that it's in superposition, rather than in a static state? If so, how? Wouldn't knowing require measuring? Or, maybe to make myself more productive, what's a good search term for this? :)

assetlabel 4y ago
Bell's Theorem and the many experiments that followed allegedly prove that they couldn't have taken on any state before measurement, based on probability theory. If they had predetermined states before you measured them, there is a limit to how often an experiment could yield a certain result. But in these experiments, that limit is exceeded. Search for "bell inequality".
armchairhacker 4y ago
There are reliable ways to create superposition particles: when you measure in one direction, the other direction is a superposition (https://physics.stackexchange.com/questions/43974/how-can-we-create-superposition-in-qm https://physics.stackexchange.com/questions/43974/how-can-we...). I have no idea how to create entangled superposition particles: maybe read https://www.eurekalert.org/news-releases/473741 https://www.eurekalert.org/news-releases/473741. You can tell the particles are in a superposition because they behave differently than those in a static state: - Double-split experiment: https://en.wikipedia.org/wiki/Double-slit_experiment https://en.wikipedia.org/wiki/Double-slit_experiment - only particles in a superposition create interference patterns - Bell's paradox: https://www.youtube.com/watch?v=v7jctqKsUMA https://www.youtube.com/watch?v=v7jctqKsUMA, https://www.youtube.com/watch?v=hiyKxhETXd8 https://www.youtube.com/watch?v=hiyKxhETXd8 - entangled particles in a superposition can be measured to make predictions with more confidence than if they were simply static particles with different states I guess a good search term would be "Polarized light and quantum mechanics" because IMO polarized light is a good example which you can even simulate yourself if you have a polarizing filter (https://www.youtube.com/watch?v=zcqZHYo7ONs&t=736s https://www.youtube.com/watch?v=zcqZHYo7ONs&t=736s, https://www.youtube.com/watch?v=ZudziPffS9E https://www.youtube.com/watch?v=ZudziPffS9E, https://chem.libretexts.org/Bookshelves/Physical_and_Theoretical_Chemistry_Textbook_Maps/Supplemental_Modules_(Physical_and_Theoretical_Chemistry)/Quantum_Tutorials_(Rioux)/Quantum_Fundamentals/08%3A_Quantum_Principles_Illuminated_with_Polarized_Light https://chem.libretexts.org/Bookshelves/Physical_and_Theoret...)
- ngcc_hk 4y ago
  The polarised one is really crazy as it is macroscopic and daily life.
  - denton-scratch 4y ago
    It's also dead easy to do - use a cheap laser pointer, a tinfoil cap with a pinhole, and some polarising lenses from an optician (he gave me a couple for free).
junon 4y ago
This is also my question/confusion.