• 6 Posts
  • 14 Comments
Joined 1 year ago
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Cake day: July 4th, 2023

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  • So imagine Lemmy is outlook.com and Mastodon in gmail.com. When you want to send an email to someone on outlook.com, you send them on gmail.com to their outlook address.

    Lemmy and Mastodon work similarly. From Mastodon, you can follow Lemmy communities and interact with posts and comments directly from within Mastodon. Your login information on Mastodon is separate from Lemmy, they’re different accounts on different instances.

    What you’ll want to do is log into Mastodon on Mastodon and follow Lemmy communities. You’ll be able from there to interact with Lemmy like you’re interacting with Toots. Granted it only works if the instance you’re following federates with mastodon.












  • Accidentally posted an unfinished comment earlier and lost it, but oh well.

    That’s a very loaded set of questions for an ELI5 explanation.

    The concept of quantum entanglement is that we are able to measure particles in a system based on one observation of parts of the system. So for example, say you have two particles that can either spin positively or negatively that form a system and you know that these particles are entangled and that the system produces a spin of 0. You observe one particle and it’s spin is negative. Automatically, you are able to infer that the other particle in the system is spinning positively.

    This concept can be applied to a lot of “non quantum” things. For example, say your friend owns only two pair of shoes and that when he isn’t wearing one, the other pair is on his shoe rack. When you see your friend wearing his red shoes, you know where his blue shoes are. That’s because you know the rules of the your friends shoe system.

    One misconception that people have about quantum entanglement is that changing the state of a particle/part of the system automatically changes the state of the whole system. That isn’t true. If you were to steal your friends shoes and wear them on your feet, someone seeing you wearing the shoes wouldn’t be able to tell where the blue shoes are because they are no longer entangled.

    One other important concept in quantum entanglement is that the act of observing a system inherently changes the state of that system. If you don’t see your friend wearing his red or blue shoes, there’s no way for you to tell which pair is out and which pair is in. The moment you observe your friend and his shoes, the knowledge you have about the location of the other pair of shoes changes.

    Applications of quantum entanglement are hard to explain. It’s present in concepts such as quantum cryptography and key distribution. You can create dice with quantum entanglement properties.

    Quantum entanglement has all sorts of applications that make it very valuable in the real world. Especially in quantum computing but also that helps us observe systems and explain things in physics, biology, chemistry and many other fields.


  • Imagine your friend has two cars. When he isn’t using one of them, the car is in his driveway. When you see your friend in town driving his car, you automatically are able to tell where his other car is: in his driveway. However you can only tell where the other car is when you observe either one of the cars. This is a fundamental property of entanglement. Entangled particles can only be described as a system and not independently of each other because observing them individually changes their properties.

    Quantum entanglement is vaguely similar. When you have two particles with a correlated state, you can know what state the particle is by observing only one of the particles. Say particle 1 has a positive spin, you know by observing particle 1 that particle 2 has a negative spin. This is also applicable in computing, where if you know the state of one quantum gate, you can tell the state of another quantum gate when you observe it.

    It’s important to note that particles are only in a correlated state as long as you don’t actively manipulate them to change their state. If you were to manually give particle 1 a negative spin then you wouldn’t be able to tell what state particle 2 is in.

    Quantum entanglement has a lot of different possible applications in the real word. Things like quantum cryptography and quantum key distribution for example. The overarching concept is that by observing a quantum system you change its properties.