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Updated: May 29, 2026
06:42
Generation and Coherent Control of Pulsed Quantum Frequency Combs
Published on: June 8, 2018
Bell inequalities with no quantum violation and unextendable product bases
R Augusiak1, J Stasińska, C Hadley
1ICFO-Institut de Ciències Fotòniques, Castelldefels, Barcelona, Spain.
Physical Review Letters
|September 10, 2011
Summary
Quantum mechanics can outperform classical physics, but not always. Certain quantum states show that supraquantum correlations offer advantages where classical and quantum correlations fail, revealing new insights into quantum correlations.
Area of Science:
- Quantum Information Science
- Quantum Foundations
Background:
- Classical correlations are limited by Bell inequalities.
- Quantum mechanics often violates these inequalities, demonstrating nonlocality and outperforming classical physics.
- However, scenarios exist where quantum correlations do not surpass classical limits.
Purpose of the Study:
- To investigate situations where quantum correlations do not offer an advantage over classical correlations.
- To explore the role of bound entangled states in these scenarios.
- To identify the existence of supraquantum correlations that can outperform both classical and quantum correlations.
Main Methods:
- Construction of bound entangled states from unextendable product bases.
- Analysis of a wide family of tasks involving these states.
- Comparison of classical, quantum, and supraquantum correlations.
Main Results:
- Identified a class of bound entangled states where quantum correlations do not outperform classical ones.
- Demonstrated the existence of supraquantum nonsignaling correlations in these specific scenarios.
- These supraquantum correlations provide an advantage where both classical and quantum correlations fall short.
Conclusions:
- Bound entangled states can exhibit unique correlation properties.
- Supraquantum nonsignaling correlations represent a resource beyond standard quantum mechanics.
- This research expands our understanding of the limits and potential of quantum correlations.
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