Quantum Communication

Symmetric photons make good communicators

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Science  21 Nov 2014:
Vol. 346, Issue 6212, pp. 961
DOI: 10.1126/science.346.6212.961-d

Future communication networks will be based on quantum mechanics and will rely on the ability to store quantum information in quantum nodes and transfer that information between them. Photons offer the ability to transfer information over long distances, but that requires that single photons be emitted and detected reliably at each end of the communication channel—a feat that requires the photons to be symmetric. Using a superconducting-based quantum circuit, Pechal et al. demonstrate how to generate the symmetric microwave photons that will be necessary to carry quantum information successfully.

Phys. Rev. X 4, 041010 (2014).

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