Entangled solid-state qubits separated by three meters

Quantum entanglement is a phenomena that allows the construction of quantum networks which have the potential to revolutionize information processing. This property can establish a connection between spatially separated network registers or quantum bits (qubits), thus enabling the creation of quantum networks. The research cited here [1], achieved entanglement of two electron spin qubits arranged in a diamond set-up distanced by three meters. They established this entanglement between solid-state nitrogen-vacancies by using a combination of spin initialization and single-shot readout techniques [2]. The long-distance entanglement reported can be combined with entanglement operations of nuclear spin registers, opening the possibility for creation of extended quantum networks and long-distance teleportation.

[1] H. Bernien, B. Hensen, W. Pfa, G. Koolstra, M. Blok, L. Robledo, T. Taminiau, M. Markham, D. Twitchen, L. Childress, et al., Nature 497, 86 (2013).

[2] L. Robledo, L. Childress, H. Bernien, B. Hensen, P. F. Alkemade, and R. Hanson, Nature 477, 574 (2011).