A Quantum Turnstile Chip for Photons ⚡ экспресс
Imagine a door that only opens one way. Scientists have created just such a 'one-way valve' for single particles of light (photons) on a miniature chip. This could help build a quantum internet protected from interference. Do you think we'll ever be able to send messages that are impossible to intercept?
A turnstile lets you through only forward, and not a step back. Physicists have implemented a similar principle on a tiny semiconductor chip for single photons—particles of light. The device works without magnets or noise, using ideas tracing back to the laser inventor Charles Townes: it gently changes the photon's color (frequency) along the way, like a ticket inspector stamps a pass. The backward path is blocked with 99.96% efficiency—more reliable than mechanical valves. Meanwhile, the fragile quantum state isn't destroyed, and signal loss is less than 1%.
The most surprising part: such directed light not only transmits data without excess noise, but can also cool sensitive detectors by extracting their thermal energy. This paves the way for a quantum internet—a network protected from eavesdropping by the very nature of particles.
🎯 Ordinary prisms and lenses, like in binoculars, only change the direction of light but don't prevent backward travel. This chip is a true non-return valve for photons.