Topological Circuit Chip Helps in Coding Quantum Information

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Researchers developed and replicated Hong-Ou-Mandel experiment to demonstrate high-fidelity quantum interference undergone by topological photonic chip.

Scientists developed a topological photonic chip to process quantum information, promising a more robust option for scalable quantum computers. Researchers at RMIT University demonstrated that quantum information can be encoded, processed, and transferred at a distance with topological circuits on the chip. The study was headed by Dr. Alberto Peruzzo of RMIT University and was published in the journal Science Advances on September 2018 and the project was part of the Photonic Quantum Processor Program at CQC2T.

Using topological photonics, the team produced a high precision photonic quantum gate by fabricating a chip with a ‘beamsplitter’. Topological photonics is an expanding field that holds high potential to study the physics of topological phases of matter in a novel optical context. The team collaborated with scientists from the Politecnico di Milano and ETH Zurich to design the new chip, which will provide new ways in studying quantum effects in topological materials and processing.

“Topological photonics have the advantage of not requiring strong magnetic fields, and feature intrinsically high-coherence, room-temperature operation and easy manipulation” says Peruzzo, Chief Investigator at the ARC Centre of Excellence for Quantum Computation and Communication Technology (CQC2T) and Director, Quantum Photonics Laboratory, RMIT.

The researchers replicated the Hong-Ou-Mandel (HOM) experiment to demonstrate the effect of topological photonic chip and concluded that topological states can undergo high-fidelity quantum interference. The researchers concluded that their findings would open new avenues in the development new materials, new generation computers, and deeper understandings of fundamental science.

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