we have to try harder in that part, its weak spot, that can be improved

# Photonics breakthrough could lead to powerful on-chip quantum computing

Researchers have demonstrated a breakthrough method that could enable powerful quantum computing on a silicon chip.

The team led by RMIT University has developed a photonic integrated circuit that uses light to improve qubit fidelity, a key requirement for a functional quantum computer.

Quantum computing has the potential to revolutionise technology, enabling calculations that would take a classical computer longer than the age of the universe. However, qubits – the building blocks of quantum computers – are incredibly fragile, requiring complex control systems to maintain their delicate state.

The research led by Dr Alberto Peruzzo, Vice-Chancellor’s Research Fellow at RMIT, used a technique called time-bin encoding, where data is stored in short pulses of light, with each pulse representing a qubit. This allows the quantum state of a qubit to be preserved without the need for constant calibration, a significant advantage over other approaches.

“By encoding qubits in a circuit that generates, manipulates and measures light, we’ve been able to demonstrate a proof of concept that delivers the necessary performance to make on-chip quantum computing a reality,” Peruzzo said.

The research involved the collaboration of scientists from RMIT, the University of Bristol, and the University of Padua in Italy.

Professor Alberto Iodice from the University of Padua said: “The key is to preserve the quantum state of each qubit and, if possible, to have a large number of qubits available for computational operations.”

This is the first time the group has managed to implement the complex time-bin encoding method for quantum computing, which had previously only been demonstrated in fibre optic systems. The team’s next step is to extend the concept to create a multi-qubit photonic processor capable of performing simple quantum algorithms.

“This is an exciting development in the quest for a functional quantum computer,” Peruzzo said. “By harnessing the power of light, we can create a more stable and efficient platform for quantum computing, bringing us closer to realising the full potential of this revolutionary technology.”

The research was supported by the Australian Research Council and the European Research Council.

Reference: “A photonic integrated circuit with time-bin encoded qubits” by Alberto Peruzzo, Lorenzo Lunghi, Niccolo Somaschi, Valentina Parigi, Yassine Lahoud, Alberto Iodice and Terry Rudolph, 29 September 2021, Nature Photonics.DOI: 10.1038/s41566-021-00844 Read from source...

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Article's Dated At:
Tue, 26 Sep 2024 09:12:00 GMT
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