Diamond Materials

Diamond Materials for Quantum Application

23. September 2014: The DFG research group FOR 1493 “Diamond Materials and Quantum Applications” goes into its second funding period. FOR1493 is a national research consortium funded by the Deutsche Forsch-ungsgemeinschaft.

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ERC Advanced Grant


Molecular quantum spin network controlled by a single qubit

Applications of quantum technologies will require an unprecedented level of complexity and control of the system at the nanoscale, while retaining precision and scalability in the fabrication. The identification and characterization of suitable elementary building blocks for such technologies is crucial.

Here we present such a basic unit, a synthetic polypeptide chain with electronic spin bearing side groups. These so called spin labels are attached at specific sites of the molecular backbone using chemistry methods and separated at almost arbitrary distances, here a few nanometers. The molecular spins are controlled and read out using a nitrogen vacancy (NV) center in diamond, which provides pure optical access of single quantum states. We demonstrate the feasibility of coherent spin manipulation and access of the direct dipolar coupling tensor of pairs of S=1/2 electronic spins close to the single molecular level (≤ 3 doubly labeled molecules). The pairwise dipolar coupling of spins is found to be ~5.5 ± 1 MHz, in agreement with the designed intra-molecular spin-spin distance.

These results show for the first time, that arbitrary molecular quantum spin networks can be accessed on the single molecular level, thus opening the path to applications like molecular quantum simulators, quantum information processing, or single molecular structure determination.

Reference: Molecular quantum spin network controlled by a single qubit, Lukas Schlipf, Thomas Oeckinghaus, Kebiao Xu, Durga Bhaktavatsala Rao Dasari, Andrea Zappe, Felipe Fávaro de Oliveira, Bastian Kern, Mykhailo Azarkh, Malte Drescher, Markus Ternes, Klaus Kern, Jörg Wrachtrup, Amit Finkler, Science Advances 2017