aiqbench takeQuantum Computing

Researchers at Heilongjiang University have demonstrated a compact, single-layer metasurface capable of performing high-fidelity optical controlled-Y gates essential for universal quantum computation. By leveraging polarization-encoded photons and parallel beam splitting, the device achieves matrix fidelities exceeding 0.98 across multiple measurement bases, validating its potential as a monolithic platform for entangled-state manipulation. Operating at the standard 1550 nm wavelength with an estimated 26.5 nm bandwidth, this design offers a promising pathway for integrating quantum logic directly into existing photonic communication infrastructure.

Source coveringQuantum Zeitgeist

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Researchers create a quantum gate with a single, flat metasurface

Quantum ZeitgeistSeptember 7, 20262 min read

Two-qubit controlled gates, such as the controlled-Y gate, are essential building blocks for universal quantum computation. Researchers propose and numerically demonstrate an optical quantum controlled-Y gate based on a single-layer Pancharatnam–Berry gradient metasurface operating at 1550 nm.

Researchers at Heilongjiang University have created a quantum gate using a single-layer gradient metasurface, a development published in Quantum Science and Technology on September 7, 2026. The team achieved a high-fidelity optical…

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