Volume 2, Issue 2, pages 32-46
Avshalom C. Elitzur [Show Biography], Eliahu Cohen [Show Biography] and Tomer Shushi [Show Biography]
Born in 1957 in Iran. PhD Tel-Aviv University under the supervision of Yakir Aharonov. Specializes in foundations of quantum mechanics, special and general relativity, and thermodynamic aspects of living systems. Together with Lev Vaidman has invented interaction-free measurement (1993); with Shahar Dolev – the quantum liar paradox (2006); with Eliahu Cohen – quantum oblivion (2013). Other publications deal with foundational issues in philosophy of mind, evolutionary theory and ethics. He is a founding member of Iyar, the Israeli Institute for Advanced Research.
Born in Israel, 1986. Did his PhD in Tel-Aviv University under the supervision of Yakir Aharonov and Lev Vaidman. Currently, a postdoctoral research assistant at the University of Bristol and a member of Iyar, the Israeli Institute for Advanced Research. Mostly interested in quantum foundations, quantum information, cosmology and the relations between them.
Born in Israel, 1989. Received his BA in Computer Science and Economics (Cum laude) from Bar-Illan University, and his MA in Theoretical Statistics (Cum laude) from University of Haifa. Recently, he submitted his PhD dissertation in Mathematics from University of Haifa, and currently starting a postdoc in fundamental aspects of quantum mechanics in the Physics Department of Ben-Gurion University.
In the EPR experiment, each measurement addresses the question “What spin value has this particle along this orientation?” The outcome then proves that the spin value has been affected by the distant experimenter’s choice of spin orientation. We propose a new setting where the question is reversed: “What is the orientation along which this particle has this spin value?” It turns out that the orientation is similarly subject to nonlocal effects. To enable the reversal, each particle’s interaction with a beam-splitter at t1 leaves its spin orientation superposed. Then at t2, the experimenter selects an “up” or “down” spin value for this yet-undefined orientation. Only after the two particles undergo this procedure, the two measurements are completed, each particle having its spin value along a definite orientation. By Bell’s theorem, it is now the “choice” of orientation that must be nonlocally transmitted between the particles upon completing the measurement. This choice, however, has preceded the experimenter’s selection. This seems to lend support for the time-symmetric interpretations of QM, where retrocausality plays a significant role. We conclude with a brief comparison between these interpretations and their traditional alternatives, Copenhagen, Bohmian mechanics and the Many Worlds Interpretation.
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