Reconfigurable multiphoton entangled states based on quantum photonic chips

Area of Science:

• Quantum Information Science
• Quantum Optics
• Quantum Computing

Background:

• Multipartite entanglement is fundamental to quantum mechanics and crucial for quantum information processing.
• Efficient generation of multiphoton entangled states is essential for advancing quantum technologies.
• Current methods for generating such states face challenges in scalability and reconfigurability.

Purpose of the Study:

• To propose novel, advantageous schemes for preparing multiphoton entangled states on a quantum photonic chip.
• To leverage graph theory for the systematic generation of these states.
• To enable scalable and reconfigurable on-chip generation of diverse multiphoton entangled states.

Main Methods:

• Scheme 1: Constructing graphs for multiphoton states using a network of spatially anti-bunching two-photon sources.
• Scheme 2: Constructing graphs via a linear beam-splitter network for efficient generation of W and Dicke states.
• Both schemes are based on graph theory principles for entanglement generation.

Main Results:

• Demonstrated two distinct, scalable schemes for on-chip multiphoton entangled state preparation.
• The proposed methods allow for reconfiguration to generate various types of multiphoton states.
• Both schemes offer efficient generation pathways, particularly for W and Dicke states in the second scheme.

Conclusions:

• The study provides a systematic solution for the on-chip generation of multiphoton entangled states.
• These advancements are expected to significantly promote the practical development of multiphoton quantum technologies.
• The proposed graph-based approaches offer scalability and flexibility for future quantum applications.