Entangled Photons vs. Murky Media ⚡ экспресс
Light scattering in complex media limits optical methods in astronomy and microscopy. Existing computational techniques and wavefront shaping treat scattering as a linear inverse problem and overlook the quantum properties of the incident field. We demonstrate selective image transmission based on quantum entanglement: a wavefront turns the medium into a quantum-classical filter. Images encoded in entangled two-photon states are transmitted without distortion, while classical light remains completely scattered and unreadable. The method exploits the preservation of photon correlations across different measurement bases—a property with no classical counterpart. This approach enables light control in complex media by tailoring solutions to the quantum features of the input state, opening possibilities for secure information transfer: the channel remains opaque to classical signals while maintaining a quantum channel.
Ordinary light in murky water, fog, or behind cosmic dust scatters, turning any image into a blurry mess. Even precise brightness measurements (photometry) can't cut through this chaos.
But you can take a pair of entangled photons. These particles are linked by an invisible thread: whatever happens to one instantly reflects on the other, like two swimmers always moving in sync. This strange connection was studied by John Bell and Alain Aspect. One photon is sent through murky water, while the other stays aside. Although the transmitted light becomes unrecognizable, the image information doesn't vanish—it's preserved in the movements of the untouched twin. By reading these movements, you can reconstruct a sharp image as if the medium had become transparent—but only for this quantum duo.
You get a hidden channel: to an outside observer, it's just white noise, but for those who know the pair's rhythm, it's a clear picture. Such a connection is nearly impossible to intercept, and it can be adapted to any scattering medium, from biological tissues to clouds.
🎯 Quantum entanglement is already used for ultra-secure banking transactions. The new method promises to take this protection to the level of entire images, not just keys.