Quantum entanglement in plasmonic waveguides with near-zero mode indices

Area of Science:

• Quantum optics
• Condensed matter physics
• Nanophotonics

Background:

• Quantum entanglement is crucial for quantum information processing.
• Plasmonic waveguides offer unique light-matter interaction properties.
• Controlling entanglement in quantum dot systems is challenging.

Purpose of the Study:

• To investigate quantum entanglement between two quantum dots (QDs) in a plasmonic waveguide.
• To analyze the impact of near-zero mode index on entanglement.
• To explore the dependence of concurrence on system parameters.

Main Methods:

• Theoretical investigation of quantum entanglement.
• Modeling of two QDs in a plasmonic waveguide.
• Analysis of concurrence with varying interdot distance, frequency detuning, and coupling strength.

Main Results:

• High concurrence was achieved over a broad range of interdot distances.
• The near-zero mode index significantly relaxes distance requirements compared to conventional waveguides.
• The system exhibits near-zero phase variation, beneficial for quantum applications.

Conclusions:

• The proposed QD-plasmonic waveguide system demonstrates robust quantum entanglement.
• This system holds significant potential for advancing quantum optics and quantum information processing.
• The near-zero mode index is a key factor in achieving efficient entanglement.