Quantum embezzlement is hiding in known one-dimensional materials: Study

A recent study by researchers at Leibniz University Hannover in Germany has demonstrated that the phenomenon of quantum embezzlement—previously thought to exist only in idealized, infinite quantum systems—can actually occur in real, finite one-dimensional materials known as critical fermion chains. Quantum embezzlement is a unique form of entanglement where one system can supply entanglement to another, enabling state changes without itself being altered, analogous to borrowing resources without depletion. The study found that these critical fermion chains, which are highly entangled systems at phase transition points, satisfy the strict criteria for universal embezzlement, meaning they can assist in creating any entangled state across various scenarios. Importantly, the researchers showed that this embezzlement property is not limited to infinite systems (the thermodynamic limit) but also emerges in large, finite fermion chains that could be experimentally realized. This suggests that quantum embezzlement is not merely a theoretical curiosity but a physical effect