Journal
PHYSICAL REVIEW LETTERS
Volume 113, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.113.050401
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Funding
- EU [Marie Curie CIG 293993/ENFOQI]
- BMBF (Chist-Era Project QUASAR)
- FQXi Fund (Silicon Valley Community Foundation)
- DFG
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We show that the quantum bound for temporal correlations in a Leggett-Garg test, analogous to the Tsirelson bound for spatial correlations in a Bell test, strongly depends on the number of levels N that can be accessed by the measurement apparatus via projective measurements. We provide exact bounds for small N that exceed the known bound for the Leggett-Garg inequality, and we show that in the limit N -> infinity the Leggett-Garg inequality can be violated up to its algebraic maximum.
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