Taking the Noise Out of Fiber Optic Cables for Quantum Purposes

Demonstrating entanglement through a fiber cable with high fidelity

Key points…

+  A team of researchers from Heriot-Watt University, the Indian Institute of Technology and the University of Glasgow has demonstrated a way to transport entangled particles through a commercial fiber cable with 84.4% fidelity.

In their setup, light from the photon that did not pass through the complex medium propagated backward from the detector, allowing the photon to appear as if it had emerged from the crystal as the other photon. Testing of the technique showed it to have 84.4% fidelity.

+  The study of entanglement, its properties and possible uses has made headlines due to its novelty and possible applications—particularly in quantum computers. One of the roadblocks standing in the way of its use as an international computer communications medium is noise encountered along the path through fiber cables that destroys the information they carry. In this new effort, the researchers have found a possible solution to the problem—using a unique attribute of entanglement to reduce losses due to noise.

+  In essence, the entangled state of a particle (or photon in this context) created an image of the fiber cable, which allowed for reversing the scattering within it as a photon was transmitted. And furthermore, the descrambling could be achieved without having anything touch either the fiber or the photon that moved through it.

Source:  Phys.org.  Bob Yirka,  Demonstrating entanglement through a fiber cable with high fidelity…

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