Entanglement is precious, allowing us to perform all kinds of quantum tricks. But it is easily buried under technical noise. Two experiments show how to distil the 'good parts' from a data stream and recover high-quality entanglement.
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Bachor, HA. Pick the best and ignore the rest. Nature Phys 4, 909–910 (2008). https://doi.org/10.1038/nphys1145