Catalytic Activation of Bell Nonlocality

Area of Science:

• Quantum Information Science
• Quantum Foundations

Background:

• Certain entangled quantum states exhibit correlations that can be simulated classically, classifying them as Bell local.
• Bell-local states cannot violate Bell inequalities, a key indicator of quantum nonlocality.

Purpose of the Study:

• To demonstrate the activation of Bell nonlocality in Bell-local states through a catalytic process.
• To show that this activation can occur deterministically using only local operations.

Main Methods:

• A protocol involving a Bell-local state and a catalyst is presented.
• The protocol transforms the Bell-local state into a Bell-nonlocal state while preserving the catalyst.
• The technical approach leverages the connection between catalytic and many-copy activation of nonlocality.

Main Results:

• Bell nonlocality can be activated in Bell-local states via a catalytic quantum process.
• The transformation is deterministic and relies solely on local operations.
• Superactivation of Bell nonlocality is achieved even when the catalyst itself is Bell local.

Conclusions:

• Catalytic quantum processes can generate Bell nonlocality from classically simulable states.
• This work introduces a novel form of quantum catalysis and superactivation of Bell nonlocality.
• The findings have implications for understanding the fundamental nature of quantum correlations and nonlocality.