Quantum Source and Israel’s DDR&D Demonstrate Robust Single-Atom Source for Real-World Quantum Communication
AI-summarised brief · reviewed before publication
Quantum Source Labs, in partnership with Israel’s DDR&D, unveiled a deterministic single‑atom platform that generates on‑demand polarization‑entangled photon pairs in the singlet Bell state. A rubidium atom coupled to a microscopic optical cavity emits two photons within tens of nanoseconds, producing high‑fidelity entanglement without the probabilistic limits of spontaneous parametric down‑conversion. The team transmitted these pairs through more than one kilometre of standard, unstabilized optical fiber, observing no measurable loss of fidelity despite arbitrary, continuously changing polarization conditions and a propagation delay of over five microseconds. The experiment demonstrates that the singlet state’s invariance to identical polarization rotations can eliminate the need for active stabilization, simplifying deployment of quantum repeaters, networking nodes, and future quantum‑internet infrastructure.
💡 Why It Matters
- · By removing active polarization control, the technology makes real‑world quantum links viable on existing fiber networks, accelerating the rollout of scalable quantum communication systems.
