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Generation and Coherent Control of Pulsed Quantum Frequency Combs

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Published on: June 8, 2018

Superactivation of quantum nonlocality.

Carlos Palazuelos¹

¹Instituto de Ciencias Matemáticas, Consejo Superior de Investigaciones Científicas, Campus de Cantoblanco, 28049 Madrid, Spain.

Physical Review Letters

|December 11, 2012

Summary

Quantum nonlocality can be amplified by creating multiple copies of a quantum state, leading to stronger violations of Bell inequalities. This superactivation effect is demonstrated even for states with initially weak nonlocality.

Area of Science:

Quantum Information Science
Quantum Foundations
Quantum Many-Body Systems

Background:

Bell inequalities are crucial for verifying quantum nonlocality.
Previous research focused on direct observation of nonlocality in quantum states.
The concept of state superactivation remained largely unexplored.

Purpose of the Study:

To demonstrate the phenomenon of quantum nonlocality superactivation.
To investigate the potential magnitude of Bell inequality violations achievable through superactivation.
To explore the relationship between state dimension and the degree of superactivation.

Main Methods:

Tensorization of local quantum states to create multi-copy entangled states.
Analysis of Bell inequality violations for these multi-copy states.

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Systematic variation of quantum state dimensions to quantify superactivation effects.

Main Results:

Demonstrated superactivation of quantum nonlocality, where tensorizing a local state violates Bell inequalities.
Identified quantum states exhibiting minimal Bell violation that yield significant violations upon using multiple copies.
Showed that the gap between initial and superactivated Bell violation can be arbitrarily increased with state dimension.

Conclusions:

Quantum nonlocality can be amplified through state tensorization, a process termed superactivation.
Superactivation offers a pathway to observe strong nonlocal correlations even from weakly nonlocal states.
The dimension of quantum states plays a critical role in maximizing the superactivation effect.