Sunlight creates quantum entanglement once thought to require lasers
Scientists have generated quantum entanglement directly from sunlight, potentially offering a lower-energy alternative to the lasers normally used in quantum technology. Their outdoor experiment produced entangled photons with about 94% similarity to an ideal state. The result could pave the way for simpler quantum satellites, secure communications, and more energy-efficient quantum computing.
Recent research has demonstrated that sunlight, often considered an unlikely source, can be harnessed to generate quantum entanglement between photons. Quantum entanglement is a key feature for applications like secure communication, precise sensing, and advanced computing. The groundbreaking study, published in the journal Optica, reveals that abundant natural light sources can be utilized for quantum entanglement, potentially leading to more energy-efficient and accessible quantum technologies.
The findings, achieved through a collaboration between researchers at the University of Ottawa and the Max Planck Institute for the Science of Light, show that sunlight can produce entanglement comparable to laser-based techniques. This was made possible by the development of a specialized solar concentrator, which concentrated sunlight onto a small nonlinear crystal, enabling the generation of high-quality polarization entanglement.
The team tested their results through an outdoor experiment, finding that the entanglement produced with sunlight was approximately 94% similar to a perfectly entangled state. This remarkable feat could have significant implications for the development of satellite-based quantum communication systems, as it reduces the need for onboard lasers and associated hardware.
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