Volume 47, Number 4, August II 1999
|Page(s)||407 - 413|
|Published online||01 September 2002|
Are violations to temporal Bell inequalities there when somebody looks?
Institut für Theoretische Physik, Universität Innsbruck Technikerstraße 25/2 - 6020 Innsbruck, Austria ECT*, European Centre for Theoretical Studies in Nuclear Physics and Related Areas Strada delle Tabarelle 286, 38050 Villazzano (Trento), Italy
2 Dipartimento di Fisica, Università di Roma "La Sapienza” INFN, Sezione di Roma - P.le Aldo Moro 2, 00185 Roma, Italy
3 Dipartimento di Fisica "G. Galilei”, Università di Padova Via Marzolo 8, 35131 Padova, Italy INFM, Sezione di Roma 1 - P.le Aldo Moro 2, 00185 Roma, Italy
Accepted: 25 June 1999
The possibility of observing violations of temporal Bell inequalities, originally proposed by Leggett and Garg as a mean of testing the quantum-mechanical delocalization of suitably chosen macroscopic bodies, is discussed by taking into account the effect of the measurement process. A general criterion quantifying this possibility is defined and shown not to be fulfilled by the various experimental configurations proposed so far to test inequalities of different forms.
PACS: 03.65.Bz – Foundations, theory of measurement, miscellaneous theories (including Aharonov–Bohm effect, Bell inequalities, Berry's phase) / 42.50.Lc – Quantum fluctuations, quantum noise, and quantum jumps / 85.25.Dq – Superconducting quantum interference devices (SQUIDs)
© EDP Sciences, 1999
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