heligone
3 HN recommenders · recommended in 9 months, 2015–2021
1:02 · 17K views · Apr 7, 2013
A short demo of a walking droplet on a vibrating silicone oil bath passing through a double slit and producing interference, a macro-scale analogue of pilot-wave behavior.
HN users share it to build intuition about wave-particle duality and pilot-wave ideas in quantum mechanics threads.
11 comments from Hacker News
Interestingly, there is a (possibly still incomplete?) model of QM that explains this mystery and can even be replicated in human scale experiments: The de Broglie-Bohm pilot wave model. In this model, both the wave and the particle are simultaneously real. the particle is being moved around by the wave. When we get near the double slit, the wave naturally travels through both slits and forms an interference pattern.The particle randomly moves through one of the slits, and is them carried further by the interference pattern, the highest probability being that it will be carried to one of the local maxima. The nicest part is that this exact behavior can be seen by bouncing a droplet of oil or silicone on a vibrating bath of the same material: this video . Of course, this being a consistent model for QM, it doesn't get away from the Bell inequalities, it doesn't have local realism. It does preserve realism, but it it is a nonlocal theory (some effects travel instantaneously).
If you want to develop intuition, look at this video: this video . Please note that physics as science in general is advancing constantly, but mainstream physics advances in sprints. Currently, walking droplets and Pilot Wave Theory are not good enough to be included into mainstream physics.
IMHO, you should look at this video, where water droplet at macro scale « exists in two places at once » (demonstrates self interference when passing two slits). this video
I highly recommend to watch this video first: this video , to get the idea. Then this: [LINK] , for explanation. No need to read long books.
QC is very fast random generator attached to physical quantum network, which performs calculation. Network is designed in such way, that an end state of the network is a solution to a problem. When you sample the network, you can sample it in a right moment and see the solution. For small problems, it's work flawlessly, e.g. when you need to find an odd number, the network will be in solution state 99,99999999999999% of the time. However, large networks are loosing their quantum properties very fast. Large objects have no properties of quantum objects — this is the corner stone of QM. The network can lose solution faster than it can find it, so when you sample, most of samples contains no solution to the problem, so you need to be lucky. Currently, QC math doesn't account this, so we have a "measurement problem", because physical reality doesn't match math abstraction, but mathematicians don't want to adjust their formulas. If you want to develop intuition, just look at reproduction of double slit experiment in macro[0]. It's just self-interference. BTW: If you have resources, can I ask you to help to reproduce Stern–Gerlach experiment in macro? We need fresh blood (and money for experiments). [0]: this video