Looking Glass Universe | I made a (useless) quantum computer at home @LookingGlassUniverse | Uploaded 8 months ago | Updated 3 hours ago
This video was sponsored by Screen Australia and Google Australia through the SkipAhead Initiative.
Thank you Kathy for the beautiful animations! https://kathysarpi.com

Part 2: https://youtu.be/tHfGucHtLqo

If you want to do this experiment at home, you can! It's very simple.
All you'll need is:
- a weak red laser pointer (the type in cat toys are generally safe)
- polarizing film or polarizing filter. If you have polaroid glasses or certain camera ND filters you may already have this. Otherwise it's available on amazon
- half waveplate (the plastic thing) is this one: https://www.edmundoptics.co.uk/f/polymer-retarder-film/14827/ (λ/2 Retarder Film (WP280))
- You don't need calcite, but if you want to play with it, you can find it on etsy usually. Look for a sample that's exceptionally clear

From being terrible at math to a quantum physicist - my journey

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What can my homemade quantum computer do?

$I dont know why light slows down in water. (part 2) Supported by Screen Australia and Youtube through the Skip Ahead initiative. Links to the other videos mentioned: Part 1 of this story: https://youtu.be/yP1kKN3ghOU 3Blue1Browns explanation of Feynmans proof: https://www.youtube.com/watch?v=KTzGBJPuJwM Experiment: If you’d like to try the experiment I did at home then you’ll need a phone with Lidar or you can get a laser meter quite cheaply at a hardware store. If you use an iphone, the app I found most reliable for the measurement was this one: https://apps.apple.com/us/app/lidar-measuring/id1535032210 Code: The 3D simulation is here: https://github.com/mithuna-y/speed_of_light_in_a_medium/tree/main/multiple_layers References: The Feynman lectures- “Ch 31: On the origin of refractive index” and “Ch 48: Beats”$

I did the double slit experiment at home

Many Worlds is a simplification of quantum mechanics

$I didnt believe that light slows down in water (part 1) Supported by Screen Australia and Youtube through the Skip Ahead initiative. 3Blue1Browns video: https://www.youtube.com/watch?v=KTzGBJPuJwM Part 2: https://youtu.be/uo3ds0FVpXs?si=zW8nyuZpn8NshfqC Experiment: If you’d like to try this experiment at home then you’ll need a phone with Lidar or you can get a laser meter quite cheaply. The app I found most reliable for the measurement was this one: https://apps.apple.com/us/app/lidar-measuring/id1535032210 Code: The 3D simulation is here: https://github.com/mithuna-y/speed_of_light_in_a_medium/tree/main/multiple_layers References: The Feynman lectures- “Ch 31: On the origin of refractive index” and “Ch 48: Beats” Matter and Interactions 3rd Edition - The quote is from section 24-4 on page 1001. It’s a long passage but I tried to paraphrase it accurately. Here’s the full quote: How might we measure the speed of propagation of an electromagnetic wave? One can think of two different approaches: (a) Follow a wave crest: If you watch one particular wave crest, you will see that it travels a distance λ (one wavelength) in a time T (one period). Therefore the speed of the crest is v = λ / T (b) Time the arrival of a radiative electric field: One could imagine a different way of measuring the speed of an electromagnetic wave. Suppose that you and a friend synchronize your clocks, then travel to locations that are a distance d apart. Your friend aims a laser at your location, and precisely at time t1, turns on the laser. You record the time t2 at which you first detect the radiative electric field. In the laser light, and knowing the distance between the locations and the elapsed time Δt = t2 - t1, you calculate the speed at which the laser light traveled toward you: v = d / Δt In a vacuum, these two ways of measuring the speed of a sinusoidal electromagnetic wave will give the same answer: 3 x 10^8 m/s. However, this will not necessarily be the case if part or all of the space through which the light wave travels is filled with a medium such as water, glass, or even air. In this case, method 2 (measuring the time required for information about a change in the electromagnetic field to travel a given distance) will still give 3 x 10^8 m/s. However, method 1 (timing the interval between crests in a steady state electromagnetic wave inside the medium) will give a different answer, which will almost always be less than 3 x 10^8 m/s.$

I made a (useless) quantum computer at home @LookingGlassUniverse