How macroscopic properties dictate microscopic probabilities

Yakir Aharonov*, Benni Reznik

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The effect of the agreement between macroscopic and microscopic observations on the quantum probability law was demonstrated. The sample was a collection of magnetic moments all pointing in the same direction. Macroscopic measurement induced a vanishing small disturbance on each individual spin. Microscopic measurements disturbed the spins and randomized the state of the sample according to the quantum probability law. Results indicated that for a large but finite sample the probability law follows, under an assumption on the stability of physical laws against small perturbations.

Original languageEnglish
Article number052116
Pages (from-to)521161-521164
Number of pages4
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Issue number5 A
StatePublished - May 2002


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