QUANTUM OPTICS

A game of quantum catch

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Science  19 May 2017:
Vol. 356, Issue 6339, pp. 713-714
DOI: 10.1126/science.356.6339.713-g

Realization of a quantum communication network or quantum internet will depend on the ability to successfully transfer quantum states between nodes of the network. Photons are expected to be the carriers of that information, but scattering losses and a mismatch between sender and receiver nodes can limit their utility. By tuning the energy levels of a receiver dot and introducing filters that suppress noise, Delteil et al. demonstrate the transfer of single photons from one quantum dot to another 5 m away. Their method allows the receiver dot to signal absorption of a single photon without compromising the actual quantum state, thereby presenting a possible route for developing a larger quantum network.

Phys. Rev. Lett. 118, 177401 (2017).

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