Journal
FOUNDATIONS OF PHYSICS
Volume 42, Issue 2, Pages 256-265Publisher
SPRINGER
DOI: 10.1007/s10701-011-9598-4
Keywords
Leggett-Garg inequality; Macrorealism; Non-invasive measurability; Clumsiness loophole
Categories
Funding
- SAIC
- NSF
- MDEIE (Quebec) PSR-SIIRI
Ask authors/readers for more resources
The rise of quantum information theory has lent new relevance to experimental tests for non-classicality, particularly in controversial cases such as adiabatic quantum computing superconducting circuits. The Leggett-Garg inequality is a Bell inequality in time designed to indicate whether a single quantum system behaves in a macrorealistic fashion. Unfortunately, a violation of the inequality can only show that the system is either (i) non-macrorealistic or (ii) macrorealistic but subjected to a measurement technique that happens to disturb the system. The clumsiness loophole (ii) provides reliable refuge for the stubborn macrorealist, who can invoke it to brand recent experimental and theoretical work on the Leggett-Garg test inconclusive. Here, we present a revised Leggett-Garg protocol that permits one to conclude that a system is either (i) non-macrorealistic or (ii) macrorealistic but with the property that two seemingly non-invasive measurements can somehow collude and strongly disturb the system. By providing an explicit check of the invasiveness of the measurements, the protocol replaces the clumsiness loophole with a significantly smaller collusion loophole.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available