A Single Photon Reveals Quantum Entanglement of 16 Million Atoms
Quantum theory is unequivocal: it predicts that a vast number of atoms can be entangled and intertwined by a very strong quantum relationship even in a macroscopic structure. Until now, however, experimental evidence has been mostly lacking, although recent advances have shown the entanglement of 2,900 atoms. Scientists at the UNIGE recently reengineered their data processing, demonstrating that 16 million atoms were entangled in a one-centimeter crystal. Find out all about their research in the journal Nature Communications.
The laws of quantum physics allow to emit signals and immediately detect when they are intercepted by a third party. This property is crucial for data protection, especially in the encryption industry, which can now guarantee that customers will be aware of any interception of their messages. These signals also need to be able to travel long distances using some rather special relay devices, known as quantum repeaters: crystals whose atoms are entangled and unified by a very strong quantum relationship. When a photon penetrates this small crystal block enriched with rare earth atoms and cooled to 270 degrees below zero (barely three degrees above absolute zero), entanglement is created between the billions of atoms it traverses. This is explicitly predicted by the theory, and it is exactly what happens as the crystal fulfils its function and re-emits — without reading the information it has received — in the form of a single photon.
Light analysis: the keystone of the research
It is relatively easy to entangle two particles: splitting a photon, for example, generates two entangled photons that have identical properties and behaviours. “But,” explains Florian Fröwis, a researcher in the applied physics group in UNIGE’s science faculty, “it’s impossible to directly observe the process of entanglement between several million atoms since the mass of data you need to collect and analyse is so huge.”
Particle entanglement is a prerequisite for the quantum revolution that is on the horizon, which will also affect the volumes of data circulating on the networks of the future together with the power and operating mode of quantum computers. Everything, in fact, depends on the relationship between two particles at the quantum level — a relation that is much stronger than the simple correlations proposed by the laws of traditional physics.
Two socks in the quantum world
Although the concept of entanglement can be hard to grasp, it can be illustrated using two socks! Imagine a physicist who always wears two socks of different colours. When you spot a red sock on his right ankle, you also immediately learn something about the left sock: it is not red. There is a correlation, in other words, between the two socks. This is a reasonably prosaic and quite intuitive occurrence; but when we switch to the world of quantum physics, a new type of correlation — infinitely stronger and more mysterious — emerges: entanglement.
Contacts and sources:
Florian Fröwis
Source: http://www.ineffableisland.com/2017/10/a-single-photon-reveals-quantum.html
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