Hannover 2013 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 61: Quantum information: Atoms and ions V
Q 61.1: Vortrag
Freitag, 22. März 2013, 11:00–11:15, E 214
Heralded entanglement between solid-state qubits separated by 3 meters — •Hannes Bernien1, Bas Hensen1, Wolfgang Pfaff1, Gerwin Koolstra1, Machiel Blok1, Lucio Robledo1, Lilian Childress2, Tim Taminiau1, Matthew Markham3, Daniel Twitchen3, and Ronald Hanson1 — 1Kavli Institute of Nanoscience Delft, The Netherlands — 2McGill University, Department of Physics, Montreal, Canada — 3Element Six, Ltd., Ascot, United Kingdom
Here we present our most recent results towards the realization of scalable quantum networks with solid-state qubits. We have entangled two spin qubits in diamond, each associated with a nitrogen vacancy center in diamond [1]. The two diamonds reside in separate setups three meters apart from each other. With no direct interaction between the two spins to mediate the entanglement, we make use of a scheme based on quantum measurements: we perform a joint measurement on photons emitted by the NV centers that are entangled with the electron spins. The detection of the photons projects the spins into an entangled state. We verify the generated entanglement by single-shot readout of the spin qubits in different bases and correlating the results.
These results open the door to a range of exciting opportunities. For instance, the remote entanglement can be extended to nuclear spins near the NV center. Our recent experiments demonstrate robust methods for initializing, controlling and entangling nuclear spins by using the electron spin as an ancilla [2,3].
[1] H. Bernien et al., in preparation. [2] T. van der Sar et al., Nature 484, 82 (2012). [3] W. Pfaff et al., Nature Physics (2012).