Cristi,

Thank you for a fascinating video! I really liked the way your presented the classic quantum interferometer experiment, especially when you split the apparatus in 4 puzzle pieces and discuss the Global Consistency Principle! The second part with the magnets was a little bit harder to follow, and sometimes I had trouble hearing what you were saying. For future video productions, you could try other microphones, or perhaps put in subtitles that would make your argument easier to follow, especially for people who are not already familiar with the specialized vocabulary of physics.

I hope your video does well in this contest!

Marc

P.S. If you have a chance to view, comment and vote on my trilogy of videos entitled "This Is Physics" --- where I try to convey the "fun of physics" by focusing on some of the greatest moments of its history --- it would be quite appreciated. Only one week left to vote!

    Marc,

    Thank you for the comments and the critical observations. My videos can be watched with English subtitles on Youtube: you just need to enable the subtitles on Youtube, using the "subtitles/CC" icon on the bottom right side of the video. I look forward to watch your videos. Good luck in the contest!

    Cristi

    Hi Teresa,

    I've watched your manifesto for questioning the foundations of quantum mechanics, and for searching a local realistic solution. I can't imagine a principle in physics which we should stop questioning. Principles are universal propositions, and they can be tested only in a finite number of situations, so we should never consider them proven forever, and stop testing them. Especially when they come with trouble.

    You commented on my video, which contains an interpretation of quantum mechanics that gives, in my opinion, the closest thing to local realism we can get, and in the same time relies entirely on the standard formalism of quantum mechanics. Please watch it, and if you wish, please read my essays Flowing with a Frozen River and The Tao of It and Bit, in which I explain in more details.

    Briefly, my view is that any measurement setup in QM has local real solutions. But: #1. The solution can be local, being a solution to Schrodinger's equation, but when we ask it to also be global, in the sense that it has to be extendible to the entire spacetime, the correlations follow. #2. The solution is real at any time, but depends also by the future measurements (contextuality, "delayed initial conditions"). This is better understood in the block world picture given by relativity, and in this case is just a particular case of #1. I tried to explain how this works in my video, and in the above mentioned essays. And in this video. The idea is that quantum effects are explained by solutions to Schrodinger's equation, but we have to select only a subset of these solutions, those which satisfy #1 and #2.

    Best regards,

    Cristi

    Hi Cristi

    I really enjoyed this video. I especially liked how you built up the interferometer in pieces to demonstrate the paradox induced by the presence of the second beamsplitter. The animations, which were clean and crisp, served this purpose well. I then enjoyed how you took it apart again into the four puzzle pieces to demonstrate the global consistency principle. It provides a very clear picture of what needs to be understood.

    The second part on magnetism was less clear. Shortening the video by focusing on the interferometry would make for a very strong presentation.

    I hope that you do well in the competition!

    Good luck!

    Kevin

      Hi Kevin,

      Thank you for the comments. Watching your video and liking so much both the animations and the script, I am very happy for the favorable comments. Also I am grateful for the suggestions concerning the second part. I wanted to make it actually longer, but I wanted to stay under 7 minutes, so perhaps it was not that clear as I intended.

      I wish you good luck in the contest!

      Cristi

      Dear Mr. Stoica,

      Yours is a very fine video on what is one of the truly fascinating and mysterious areas of physics. The graphics are well done. I did have a problem with the audio. I have no problem with the accent, but that combined with the speed with which you spoke caused me to miss some points you made. I realize you tried to impose a time constraint.

      The interferometer showed the photon always exiting to the right when the second splitter was there. Perhaps I missed mention of it, but that depends on the two path lengths --- it could also consistently go to the bottom detector if the paths were a half wavelength different. But that's minor and doesn't really affect the point of the your presentation which is really most interesting.

      Good luck for the competition.

      Alexander Roth

        Dear Mr. Roth,

        Thank you for watching my videos. As I mentioned under the other video, you can enable subtitles on youtube. I wish you good luck in the competition!

        Best regards,

        Cristi

        Dear Mr. Roth,

        About your remark that "it could also consistently go to the bottom detector if the paths were a half wavelength different." That's true, and that's why I made the two paths equal. Maybe I should have mentioned this in the video, but actually I had to skip not only this, but also a lot of details, explanations and clarifications, because I wanted to be simple and brief.

        Best regards,

        Cristi

        Dear Cristi,

        I have very much enjoyed seeing both your videos and have rated them.

        See you soon at DICE!

        Regards,

        Tejinder

        12 days later

        I enjoyed this Cristi..

        I think the pacing of the narration was a little better here, and it also sounded a bit more animated or enthusiastic. The graphics were excellent, as in the other video, but I found this one easier to follow. The segment with the Mach-Zehnder interferometer was especially well done, but I see how the other portion was needed to demonstrate your point. I hope you enjoyed yourself at DICE and do well in the contest.

        All the Best,

        Jonathan

          Dear Jonathan,

          Good to hear from you again! Thank you for the comments, and for pointing out the goods and the bads, feedback is what helps us improve.

          I wish you do well in the contest,

          Cristi

          8 years later
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