Revealing Einstein’s “spooky action” without destroying it

Revealing Einstein’s “spooky action” without destroying it

Entanglement is one of the most important properties of quantum particles and a core resource of many emerging quantum technologies. However, its leverage as a resource is limited as entanglement is a fragile phenomenon that is often destroyed upon detection. Until now: Using photons as ancillas, a team of physicists at MPQ has successfully developed a novel technique to detect entangled states of distant qubits while still preserving their entanglement.