This video explains why consciousness is nothing special to QM as shown by the quantum eraser experiment. I highly recommend the entire series in order.
It is extremely cute how entirely wrong this video is. Do you not think that if this video were true that there would have been countless articles written by now that proclaim to the world finally, " Consciousness does not cause collapse!" Realism would be saved if this girl was correct. Unfortunately, she makes no sense. Notice how triumphantly she declares that consciousness does not cause collapse and then at the end of the video states that "how measurement works is still an open question today, which is strange because measurement is vital to quantum mechanics." Let's consider her thought experiment:
Either M1 is a machine being monitored by a conscious observer, or M1 is a machine but no conscious observer ever sees the result. If the hypothesis is true, then in the first case, the slit that the particle goes through is measured, so there can be no interference pattern, but in the second case it's not measured, so there should be an interference pattern. Instead, when the experiment is done, both cases lead to no interference. This leads us to the conclusion that there really isn't anything special about conscious observers in Quantum Mechanics.
The first thing I notice is that she offers no sources in the description of her video, and thus I have no idea what experiment she is talking about when she claims, "Instead, when the experiment is done..." What experiment? Source please! Every Quantum Eraser experiment ever completed has had the exact opposite result as what she claims. If what she is saying were true, then the "Observer Effect" would have been explained when the first Quantum Eraser experiment was successfully conducted by Scully and Kim in 1999 http://arxiv.org/pdf/quant-ph/9903047v1.pdf
From that peer reviewed paper titled "A Delayed Choice Quantum Eraser":
In the two-slit experiment, the common "wisdom" is that the position-momentum uncertainty relation makes it impossible to determine which slit the photon (or electron) passes through without at the same time disturbing the interference pattern. However, it has been proven that under certain circumstances this common interpretation may not be true. In 1982, Skully and Druhl found a way around this position-momentum uncertainty obstacle and proposed a quantum eraser to obtain which-path or particle-like information without scattering or otherwise introducing large uncontrolled phase factors to disturb the interference. To be sure the interference pattern disappears when the which-path information is obtained. But it reappears when we erase (quantum eraser) the which-path information.
The cute little girl says, "when the experiment is done, both cases lead to no interference." and then when you read the actual peer reviewed paper it says, "To be sure the interference pattern disappears when the which-path information is obtained. But it reappears
when we erase the which-path information." Thus your cute little video is refuted.
The entire point of a Quantum Eraser experiment is to ensure that the which-path information is obtained or erased only after it has been detected
by, let's call the detector, M1.
So M1 detects the which path information, and the decision to obtain
it (M1 is a machine being monitored by a conscious observer) or erase
it (M1 is a machine but no conscious observer ever sees the result) is made after
M1 has made the detection.
If it is decided to erase
the which path information (M1 is a machine but no conscious observer ever sees the result) the interference patter reappears!! If it is decided to obtain
the which path information (M1 is a machine being monitored by a conscious observer) the wave function collapses and they get a particle pattern!! In both cases M1 "measures" the only difference is if M1 is monitored by a conscious observer or not. Your video is 100% incorrect about the results of the experiment. The machine's measurement does not cause the collapse even when it erases the information and no conscious observer is able to monitor it. She said, "when the experiment is done, both cases lead to no interference," and SHE IS WRONG!!!!
And she has no sources, so you are just trusting some little Australian girl's word on it. Do you see how easily you accept something that agrees with your beliefs and how much kickback you give when something disagrees with your beliefs? You are accepting the word of a little girl over the peer reviewed evidence because the little girl agrees with your beliefs and the peer reviewed evidence disagrees. TAKE NOTE OF THIS!!!
This is and has been the result of Quantum Eraser Experiments every single time and why the "mystery remains" in the worlds of Realists. If what your video said was true then every Realist in the world would be shouting the merits of the results of the Quantum Eraser experiment from the rooftops because finally they would have their proof that consciousness has nothing to do with observations!!! But alas, the exact opposite is the actual case, and you will find this out if you study the EVIDENCE instead of just browsing through commentary and opinions looking for anything that agrees with your beliefs....
A great break down reviewed by Dr. Kim himself who conducted the actual experiment is found here: http://www.bottomlayer.com/bottom/kim-scully/kim-scully-web.htm
In this experiment, a single photon is aimed at the double-slit. If it passes through the left slit, it will hit a crystal placed behind the slit on the left side of the crystal; if through the right slit, it will hit the crystal on the right side.
As discussed below, the experimental setup ensures that this which-path information for the signal photons is obtained or erased only after the signal photon has been detected and the information is winging its way toward the Coincidence Circuit.
The detecting mechanism that has tagged the which-path information (i.e., the generation of an entangled pair at either region A or region B) has already been accomplished, but it has not yet yielded up its which-path information to any observer.
Upon accessing the information gathered by the Coincidence Circuit, we the observer are shocked to learn that the pattern shown by the positions registered at D0 at Time 2 depends entirely on the information gathered later at Time 4 and available to us at the conclusion of the experiment.
Ho-hum. Another experimental proof of QM. This is the way it works, folks.
And if you want videos, here's a better one: