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Recorded: 7/18/2019 Released: 9/21/2019

Randy tells Jim about an experiment that purports to have enacted a test of the Wigner's Friend argument -- one that Jim never really cared for. The experiment uses a double Aspect experiment to test whether non-quantum conclusions can be made from multiple experiments on entangled photons. This one is important: according to Wigner, your soul is at stake.

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Notes:

1. The papers we read for this program:

- Wigner, E., "Remarks on the Mind Body Problem."
*The Scientist Speculates*, L.J. Good, ed. (1962). (Lecture). [Free] - Frauchiger, D., R. Renner, "Quantum Theory Cannot Consistently Describe the Use of Itself."
*Nat. Commun.***9**3711 (2018). [arXiv] - Proietti, M., A. Pickston, F. Graffitti, P. Barrow, D. Kundys, C. Branciard, M. Ringbauer, and A. Fedrizzi, "Experimental Rejection of Observer-Independence in the Quantum World.." (2019). [arXiv] Note: I can't find it published yet, so if you have seen it in print, please let me know.

2. Other articles we discussed:

- Dyson, F., "Innovation in Physics."
*Scientific American***199**(3), 74 (1955). - Pusey, M., "An Inconsistent Friend."
*Nature Physics***14**977 (2018). - Uncredited, "A Quantum Experiment Suggests There's No Such Thing as Objective Reality."
*MIT Technology Review*(2019). - Brukner, Č. "A No-Go Theorem for Observer-Independent Facts."
*Entropy***20**(2018). [arXiv]

3. Related Episodes of Physics Frontiers:

- Physics Frontiers 44: Spooky Action at a Distance.
- Physics Frontiers 33: Retrocausality
- Physics Frontiers 30: The Consistent Histories Interpretation of Quantum Mechanics
- Physics Frontiers 18: The 2T Physics of Itzhak Bars
- Physics Frontiers 2: The de Broglie-Bohm Interpretation of Quantum Mechnics

4. Some books we mentioned:

- Aharonov and Rohrlich,
*Quantum Paradoxes*. (Review) An interesting depiction of quantum mechanics that introduces quantum phenomena by way of pseudo-paradoxes: things we think shouldn't happen, but do in quantum theory. This book was used for our first attempt at a podcast. - Bell,
*Speakable and Unspeakable in Quantum Mechanics*. (Review) A selection of articles by John Bell, including those where he introduces his famous theorem that provided the impetus for the Aspect experiment. - Rae,
*Quantum Physics: Illusion or Reality?*. I remember finding this to be an interesting popular book on quantum mechanics, and it's a Canto imprint -- one of my favorite book series. - Bars and Terning,
*Extra Dimensions in Space and Time*(Review) Descriptions of the way high-energy theorists look at space and time, mainly in terms of string theory and symmetries, as I recall. - Mermin,
*Boojums All the Way Through*. David Mermin's automemoirgraphy -- which is why I said his renaming Quantum Bayesianism as QBism was evidence of his mercurial personality.

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