TY - JOUR
T1 - Can a future choice affect a past measurement's outcome?
AU - Aharonov, Y.
AU - Cohen, E.
AU - Grossman, D.
AU - Elizutr, A. C.
N1 - Funding Information:
It is a pleasure to Yuval Gefen, Nicolas Gisin, Doron Grossman, Ruth Kastner and Marius Usher for helpful comments and discussions. This work has been supported in part by the Israel Science Foundation Grant No. 1311/14 and ICORE Excellence Center “Circle of Light”.
PY - 2014
Y1 - 2014
N2 - An EPR experiment is studied where each particle undergoes a few weak measurements along some pre-set spin orientations, whose outcomes are individually recorded. Then the particle undergoes a strong measurement along a spin orientation freely chosen at the last moment. Bell-inequality violation is expected between the two final strong measurements within each EPR pair. At the same time, agreement is expected between these measurements and the earlier weak ones within the pair. A contradiction thereby ensues: i) Bell's theorem forbids spin values to exist prior to the choice of the spin-orientation to be measured; ii) A weak measurement cannot determine the outcome of a successive strong one; and iii) Indeed no disentanglement is inflicted by the weak measurements; yet iv) The weak measurements' outcomes agree with those of the strong ones. The most reasonable resolution seems to be that of the Two-State-Vector Formalism, namely, that the experimenter's choice has been encrypted within the weak measurement's outcomes, even before the experimenter themselves knows what their choice will be. Causal loops are avoided by this anticipation remaining encrypted until the final outcomes enable to decipher it.
AB - An EPR experiment is studied where each particle undergoes a few weak measurements along some pre-set spin orientations, whose outcomes are individually recorded. Then the particle undergoes a strong measurement along a spin orientation freely chosen at the last moment. Bell-inequality violation is expected between the two final strong measurements within each EPR pair. At the same time, agreement is expected between these measurements and the earlier weak ones within the pair. A contradiction thereby ensues: i) Bell's theorem forbids spin values to exist prior to the choice of the spin-orientation to be measured; ii) A weak measurement cannot determine the outcome of a successive strong one; and iii) Indeed no disentanglement is inflicted by the weak measurements; yet iv) The weak measurements' outcomes agree with those of the strong ones. The most reasonable resolution seems to be that of the Two-State-Vector Formalism, namely, that the experimenter's choice has been encrypted within the weak measurement's outcomes, even before the experimenter themselves knows what their choice will be. Causal loops are avoided by this anticipation remaining encrypted until the final outcomes enable to decipher it.
UR - http://www.scopus.com/inward/record.url?scp=84901399107&partnerID=8YFLogxK
U2 - 10.1051/epjconf/20147000038
DO - 10.1051/epjconf/20147000038
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AN - SCOPUS:84901399107
SN - 2101-6275
VL - 70
JO - EPJ Web of Conferences
JF - EPJ Web of Conferences
M1 - 00038
T2 - 1st International Conference on New Frontiers in Physics, ICFP 2012
Y2 - 10 June 2012 through 16 June 2012
ER -