Direct generation of massive vector-mode entanglement from a polarization-insensitive optical amplifier

Area of Science:

• Quantum Optics
• Quantum Information Processing
• Nonlinear Optics

Background:

• Vectorially structured modes, characterized by spatially inhomogeneous polarization, are crucial for diverse physical applications.
• Entangling these modes is a key challenge for advancing quantum optical technologies.

Purpose of the Study:

• To present a polarization-insensitive amplifier for directly generating large numbers of entangled vector vortex (VV) modes.
• To explore the potential of four-wave mixing for creating complex entangled states.

Main Methods:

• Utilized a polarization-insensitive amplifier based on the four-wave mixing (FWM) process.
• Seeded the amplifier with vacuum fields to generate entangled states.

Main Results:

• Successfully generated a large number of entangled VV modes simultaneously.
• Produced 16 sets of two-mode squeezed vacuum states, each containing two VV modes.
• Demonstrated the generation of continuous-variable entangled states.

Conclusions:

• The developed amplifier provides a direct method for generating multiple entangled VV modes.
• This work paves the way for quantum information processing that leverages the vectorial nature of optical fields.
• Enables new possibilities in quantum communication and computation.