Researchers Develop Superconducting Circuit Strategy to Link Smaller Photon Groups Into Larger Entangled States

Phys.org Science•Published: Oct 9, 2026 05:30 PM IST

Researchers at Tsinghua University and Hefei National Laboratory have introduced a groundbreaking strategy to link smaller entangled groups of microwave photons into larger, adjustable graph states using superconducting circuits. By employing a quantum non-demolition detector to perform parity measurements, the team successfully demonstrated deterministic and programmable fusion between 13 photonic qubits without destroying them.

Superconducting Circuits: The novel approach uses specialized circuits to generate microwave photons in small, entangled states, facilitating zero-resistance electrical flow below specific temperatures.
Deterministic Fusion: Unlike conventional probabilistic optical methods that frequently fail, this technique uses quantum non-demolition measurements to connect smaller graph states dependably.
Photonic Entanglement: The research successfully demonstrated entanglement across 13 photonic qubits, establishing a practical route for assembling larger, reconfigurable quantum states.

The Context & Background

Achieving large-scale entanglement among groups of qubits is a central objective for developing powerful quantum computers capable of solving complex computational problems. Traditional optical fusion techniques rely heavily on mirrors and beam splitters, facing significant limitations in scalability and high resource overheads.

Why it matters:This breakthrough addresses one of the primary scalability bottlenecks in quantum computing and quantum communications by making state fusion deterministic and programmable. By overcoming the high failure rates of conventional optical fusion, this technique paves the way for building sophisticated, larger-scale quantum networks and measurement-based quantum computers.

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