Lifeboat Foundation

After finding a mistake in the generalised quantum Stein’s lemma, researchers including CQT’s Marco Tomamichel are working through the consequences.

The proof of the generalised quantum Stein’s lemma has a gap. Image credit: Shutterstock.com/randy andy

The discovery of a flaw in the proof of a 15-year-old lemma has rocked the community of researchers who study quantum information. Results that built on the finding are also broken.