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Tag: entanglement

  • If You Don’t Understand Quantum Physics, Try This!

    If You Don’t Understand Quantum Physics, Try This!

    A simple and clear explanation of all the important features of quantum physics that you need to know. Check out this video’s sponsor https://brilliant.org/dos
    I have spent a lot of time thinking about how best to explain quantum physics and this is the result of all my hours of pondering, and I’m really happy with how it turned out. I decided to just explain it as it actually is, rather than rely on analogies. The video explains the quantum wavefunction, particle-wave duality, the measurement problem, the double-slit experiment, superposition, entanglement, quantum tunnelling, the Heisenberg uncertainty principle, and energy quantisation. Let me know if it was helpful! Cheers Dx

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    Further reading
    For a more detailed introduction to quantum physics: ‘The Quantum Universe’ by Brian Cox and Jeff Forshaw is good.
    And a slightly more advanced but fantastic description of what we do and don’t know about quantum physics is the excellent book ‘Beyond Weird’ by Philip Ball.

    Music by
    Dominic ‘Wibblyfingers’ Walliman

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  • 3 Things ‘Faster Than Light’

    3 Things ‘Faster Than Light’

    These 3 things go “faster” than the speed of light. How’s that even possible?
    Subscribe: http://www.youtube.com/channel/UCj1gf…
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    More about the experiment:
    Marissa Giustina’s research: http://arxiv.org/abs/1511.03190

    Advanced scientific note about Doppler: If there is a light moving away from you at constant velocity in static flat (Minkowski) space-time, no matter how red it is, you will never conclude it is going faster than light. But, here I am discussing the conclusions one might come to if you mistakenly use Doppler in the context of the curved space-time of the universe (where there is expansion). Interpreting the huge redshift as a result of the doppler effect, could make one think that galaxies we see are moving away at speeds approaching light speed. And since what we are actually seeing is light from those galaxies from billions of years ago, and given that the universe is expanding, you might be tempted to say that they have since “accelerated” to faster than the speed of light. You might go further and say that there are more distant galaxies that we can’t see which are moving away even faster. So you might conclude there are galaxies moving faster than light in the universe. But the redshift isn’t from doppler and this “acceleration” of the expanding universe isn’t actually causing a true increase in velocity.

    Sometimes astronomers do say there is a faster than light “recession speed” by pretending the expansion of the universe is causing distant galaxies to move away from each other at a corresponding velocity, but that’s misleading. In general relativity, you can actually have an increase in space between objects without causing a corresponding increase in the relatives velocities of those objects.

    CREDITS:

    Host, Writer, Animator, Editor:
    Greg Kestin

    From the producers of PBS NOVA
    © WGBH Educational Foundation

    Funding provided by FQXi

    Special thanks:
    Marissa Giustina
    Nick Hutzler
    Julie Elksy
    Byron Drury
    Jacob Barandes
    Tyler Howe
    Lissy Herman
    Ari Daniel
    Lauren Aguirre
    Kristine Allington
    Allison Eck
    Anna Rotschild

    MEDIA CREDITS:

    Music provided by APM:
    Deep_Science_No-perc
    Mysteries_of_Science_B
    Dreaming_of_the_Stars_a
    Curiosity_Kills_the_Cat_2
    Conundrum_a

    Images:
    Stars – Rene Barrios
    Earth – Eirika
    galaxy spiral (by coornio – diviantart)
    Squirrel with scissors – 60811670 – Dollarphotoclub
    Equations – 91613623 – Dollarphotoclub
    Maxresdefault – Sean Stewart
    Marissa Giustina – Lammerhuber
    Tangled cat – David Swayze
    Cat doll – Vicky Somma

    Stock footage:
    train-exits-tunnel – Pond5
    Bin_pulsar_442 – Courtesy of Nasa
    Expanding in space (40294) – Courtesy of Nasa
    WMAP_archive – Courtesy of Nasa