Multimode all-optical EPR steering swapping via atomic coherence-mediated four-wave mixing

Area of Science:

• Quantum Information Science
• Quantum Optics
• Quantum Communication

Background:

• Einstein-Podolsky-Rosen (EPR) steering is a quantum correlation between entanglement and Bell nonlocality.
• EPR steering swapping allows independent particles to establish EPR steering correlations.
• Current all-optical methods are limited to two-mode systems, hindering real-world quantum information applications.

Purpose of the Study:

• To propose and demonstrate an m-to-n multimode all-optical EPR steering swapping architecture.
• To extend EPR steering swapping capabilities to multimode regimes.
• To explore novel quantum correlations and control in multimode systems.

Main Methods:

• Utilizing energy-level-cascaded four-wave mixing processes for all-optical implementation.
• Harnessing light-atom interactions for scalable multimode EPR steering swapping.
• Implementing non-Hermitian control over dressing-induced coherent channels.

Main Results:

• Demonstrated scalable multimode EPR steering swapping.
• Observed distinctive, mode-dependent features like non-monotonicity and asymmetry.
• Achieved flexible controllability of multimode quantum correlations.

Conclusions:

• The proposed architecture overcomes limitations of two-mode schemes, enabling practical EPR steering.
• Multimode EPR steering swapping facilitates interfaces between non-Hermitian light-matter systems.
• This work paves the way for advanced all-optical quantum networks.