General Concurrence Percolation (GCP)

Why in News?

Scientists at the Bose Institute, Kolkata, have developed a new theoretical framework that could improve the efficiency of future quantum communication networks by enabling stronger long-distance quantum connections while using fewer network resources. The study has been published in the journal Physical Review A. 

The researchers have proposed a new protocol called General Concurrence Percolation (GCP). The protocol offers a more efficient and sustainable method for establishing long-distance quantum communication links compared with existing approaches.

The research was conducted by Dr. Deep Nath and Prof. Soumen Roy of the Bose Institute, an autonomous institute under the Department of Science and Technology (DST).

What is Quantum Entanglement?

• Quantum communication networks rely heavily on quantum entanglement.
• Entanglement is a quantum phenomenon in which two or more particles become correlated in such a way that the state of one is connected to the state of another, even when they are separated by large distances.
• It can enable highly secure forms of information exchange and is an important foundation for quantum communication and quantum networks.

Challenge in Long-Distance Quantum Communication

Maintaining strong quantum entanglement over long distances is difficult because environmental noise weakens quantum links during transmission, quantum information is highly sensitive to disturbances, and as the distance increases, maintaining reliable and strong connections becomes increasingly challenging.

Role of Percolation Theory

Existing theoretical approaches combine quantum mechanics with percolation theory, a concept from statistical physics.

These methods seek to strengthen weak quantum connections across a network. However, many existing approaches achieve this by disconnecting or removing intermediate stations within the network.

This can consume valuable network resources, alter the original structure of the network and reduce the efficiency and sustainability of quantum communication systems.

How Does GCP Improve the Network?

The General Concurrence Percolation (GCP) protocol addresses these limitations by using a geometric routing strategy rather than removing network nodes.

This allows the network to preserve its underlying structure, establish stronger long-distance quantum connections, use network resources more efficiently and potentially improve the scalability and sustainability of future quantum networks.

Source: DST

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