Optical Quantum Computing Breakthrough in Science Advances

Quantum Technology Quantum Leap: International Scientists Pioneer a Scalable Future in Optical Computing

2024-04-22 Source: University of Vienna 1 min Reading Time

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An international collaboration of researchers has achieved a significant breakthrough in quantum technology. The work published in the prestigious journal Science Advances represents a notable advancement in optical quantum computing that paves the way for more scalable quantum technologies.

Resource-efficient multi-photon processor based on an optical fiber loop.(Source: Marco Di Vita) — Resource-efficient multi-photon processor based on an optical fiber loop.
(Source: Marco Di Vita)

Interference among photons, a fundamental phenomenon in quantum optics, serves as a cornerstone of optical quantum computing. It involves harnessing the properties of light, such as its wave-particle duality, to induce interference patterns, enabling the encoding and processing of quantum information.

In traditional multi-photon experiments, spatial encoding is commonly employed, wherein photons are manipulated in different spatial paths to induce interference. These experiments require intricate setups with numerous components, making them resource-intensive and challenging to scale.

In contrast, an international team, comprising scientists from University of Vienna, Politecnico di Milano, and Université libre de Bruxells, opted for an approach based on temporal encoding. This technique manipulates the time domain of photons rather than their spatial statistics.

To realize this approach, they developed an innovative architecture at the Christian Doppler Laboratory at the University of Vienna, utilizing an optical fiber loop. This design enables repeated use of the same optical components, facilitating efficient multi-photon interference with minimal physical resources.

First author Lorenzo Carosini explains: “In our experiment, we observed quantum interference among up to eight photons, surpassing the scale of most of existing experiments. Thanks to the versatility of our approach, the interference pattern can be reconfigured and the size of the experiment can be scaled, without changing the optical setup.”

The results demonstrate the significant resource efficiency of the implemented architecture compared to traditional spatial-encoding approaches, paving the way for more accessible and scalable quantum technologies.

Original Article: Programmable multi-photon quantum interference in a single spatial mode; Science Advances; DOI:10.1126/sciadv.adj0993

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