• 0 Posts
  • 29 Comments
Joined 1 year ago
Cake day: September 27th, 2023
  • wkk@lemmy.worldtoShowerthoughts@lemmy.world•The reason why we never meet time travelers is because our civilization ends before the technology can come to fruition.
    1·
    7 months ago

    The message transferred between the particles supposedly FTL does contain information though. What I meant was that we cannot encode our own arbitrary information on top of it. The message has a physical effect on reality, without it the state we find the particles in cannot be respected.

    Just reconsider this: If we agree that the result of a measurement is totally random (no hidden variable predetermining the result of the measurement) but that once we measure and know the state of one particle then we know with certainty the state of the other particle (entanglement): information about the collapse of the first measured particle was shared to the other so that it’s no longer random.

    edit: If your argument is about “sharing information doesn’t imply transmission” then let’s stop here and leave this thread agreeing that “information was shared” :)

    I have no opinions on what shape the information sharing takes. Nor am I interested in guessing.

  • wkk@lemmy.worldtoShowerthoughts@lemmy.world•The reason why we never meet time travelers is because our civilization ends before the technology can come to fruition.
    2·
    7 months ago

    I mean you can setup a source of entangled particles and two very far detectors that would do measurements roughly at the same time on each particle in such a way that information traveling at the speed of light wouldn’t have time to travel the distance between both detectors.

    You can then just gather roughly simultaneous measurements and at a later time join the datasets from both detectors to see what one measured vs the other for each pair.

    If I understand correctly the current observations show that collapsing the state of one of the particle influences the other all the way at the other detector. Since there’s no hidden variables that predetermine the result of measurements while the result of the collapse is random, and the fact that particles still respect the correlation over any distance is why there seem to be a FTL communication between the particles.

    Something has to be communicated between the particles for the influence to work FTL, but it also seem we cannot leverage this phenomenon to send “actual information” this way :/

    edit: Important point with that experiment: once the particles have been observed, if you try the experiment a second time using the same particles, then you’ll get different results, this time in line with hidden variables because the particle’s state already collapsed.

  • wkk@lemmy.worldtoTechnology@lemmy.world•Critical Rust flaw enables Windows command injection attacksEnglish
    9·
    7 months ago

    It’s definitely not Rust’s fault, but it’s kinda Windows’ one and cmd.exe escape logic… It’s really difficult to write logic that will correctly escape any argument given to it, cmd.exe really is a pain to deal with :/

    The Rust security team faced a significant challenge when dealing with cmd.exe’s complexity since they couldn’t find a solution that would correctly escape arguments in all cases.

    As a result, they had to improve the robustness of the escaping code and modify the Command API. If the Command API cannot safely escape an argument while spawning the process, it returns an InvalidInput error.

    “If you implement the escaping yourself or only handle trusted inputs, on Windows you can also use the CommandExt::raw_arg method to bypass the standard library’s escaping logic,” the Rust Security Response WG added.

    I get that in situations where they can’t safely escape a parameter they’ll just stop with an error, which sound as sane as one could go with this!