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Probing Rényi entanglement entropy via randomized measurements

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Science  19 Apr 2019:
Vol. 364, Issue 6437, pp. 260-263
DOI: 10.1126/science.aau4963

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An entropic look into entanglement

Quantum systems are predicted to be better at information processing than their classical counterparts, and quantum entanglement is key to this superior performance. But how does one gauge the degree of entanglement in a system? Brydges et al. monitored the build-up of the so-called Rényi entropy in a chain of up to 10 trapped calcium ions, each of which encoded a qubit. As the system evolved, interactions caused entanglement between the chain and the rest of the system to grow, which was reflected in the growth of the Rényi entropy.

Science, this issue p. 260

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