"Milestones Achieved on the Path to Useful Quantum Technologies"

What Albert Einstein called "spooky action at a distance" involves tiny particles that are interconnected despite being thousands of kilometers apart at times. Something that is inexplicable by classical physics laws is a fundamental part of quantum physics. This type of entanglement can occur between multiple quantum particles, implying that certain particles' properties are closely linked together. Entangled systems with multiple quantum particles provide significant advantages in implementing quantum algorithms, which could be used in data security, quantum computing, or communications. Paderborn University researchers have collaborated with Ulm University researchers to create the first programmable optical quantum memory. The Integrated Quantum Optics group at Paderborn University employs minuscule light particles, or photons, as quantum systems. The researchers want to entangle as many photons as possible in large states. They have now presented a new approach in collaboration with researchers from Ulm University's Institute of Theoretical Physics. Attempts to entangle more than two particles previously resulted in inefficient entanglement generation. If researchers wanted to connect two particles with others, they had to wait a long time because the interconnections that promote entanglement operate with a limited probability rather than at the push of a button. As storing qubit states is a major experimental challenge, the photons were no longer a part of the experiment once the next suitable particle arrived. The researchers have now created a programmable optical buffer quantum memory that can switch between modes dynamically. This article continues to discuss the development of the first programmable optical quantum memory on the path to stronger data security and more. 

SD reports "Milestones Achieved on the Path to Useful Quantum Technologies"