A quantum network of interlocking atomic clocks

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For the first time, scientists at Oxford University have been able to demonstrate a network of two entangled optical atomic clocks and show how entanglement between distant clocks can be used to improve measurement accuracy, according to research published this week by temper nature.

Improved accuracy of frequency comparisons between multiples atomic clocks It provides the power to unleash our understanding of all kinds of natural phenomena. It is necessary, for example, in measuring the space-time difference of the fundamental constants, for geodesy where the frequency of atomic clocks is used to measure the heights of two locations, and even in the search for dark matter.

The basic limit of accuracy

tangle-a As far as it appears where two or more particles are so bound together that they cannot be described independently, even at vast distances – is the key to reaching the fundamental limit of precision it defines Quantum theory. While previous experiments have shown that entanglement between clocks in the same system can be used to improve the quality of measurements, this is the first time researchers have been able to achieve this between clocks in two separate remotely entangled systems. This development paves the way for applications such as those mentioned above, where comparing the frequencies of atoms at discrete sites with the highest possible accuracy is vital.

Bethan Nicholl, one of the authors of the paper published in temper natureThanks to years of hard work from the entire team at Oxford, our network device can produce entangled pairs of ions with HD High rate at the push of a button. Without this ability this show would not have been possible.”

Modern quantum network

The Oxford team used a modern quantum network to achieve their results. Developed by the UK’s Center for Quantum Computing and Simulations (QCS), a 17-university consortium led by Oxford University, the network was designed for quantum computing and communication rather than enhanced quantum measurement, but the researchers’ work demonstrates the ingenuity of these systems. The two clocks used in the experiment were only two meters apart, but in principle these networks could be scaled up to cover much larger distances.

“While our result is largely proof of principle, and the absolute accuracy we achieve is a few times lower than art level, we hope that the techniques described here will one day improve modern systems,” explains Dr. Rajavendra Srinivas, one of the authors of the paper. What, entanglement will be required because it provides a path to the absolute precision that quantum theory allows.”

Professor David Lucas, whose Oxford team was responsible for the experiment, said, “Our experiment shows the importance of quantum networks for measurement, with applications for Basic Physicsas well as the most well-known fields of quantum cryptography and Quantitative Statistics. ”


Two quantum memory systems that are 12.5 km apart are entangled


more information:
BC Nichol et al, An elementary quantum network of entangled optical atomic clocks, temper nature (2022). DOI: 10.1038 / s41586-022-05088-z

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the quote: a quantum network of entangled atomic clocks (2022, September 9) Retrieved September 9, 2022 from

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