A molecular quantum spin network controlled by a single qubit

作者：Schlipf, Lukas; Oeckinghaus, Thomas; Xu, Kebiao; Dasari, Durga Bhaktavatsala Rao; Zappe, Andrea; de Oliveira, Felipe Favaro; Kern, Bastian; Azarkh, Mykhailo; Drescher, Malte; Ternes, Markus; Kern, Klaus; Wrachtrup, Jorg; Finkler, Amit^*

来源：Science Advances, 2017, 3(8): e1701116.

DOI：10.1126/sciadv.1701116

• AMBIENT CONDITIONS
• ELECTRON-SPIN
• MAGNETIC-RESONANCE
• COHERENCE TIME
• DIAMOND
• NANOSTRUCTURES
• ENTANGLEMENT
• POLYPROLINE
• RESOLUTION
• PROTEINS

Scalable quantum technologies require an unprecedented combination of precision and complexity for designing stable structures of well-controllable quantum systems on the nanoscale. It is a challenging task to find a suitable elementary building block, of which a quantum network can be comprised in a scalable way. We present the working principle of such a basic unit, engineered using molecular chemistry, whose collective control and readout are executed using a nitrogen vacancy (NV) center in diamond. The basic unit we investigate is a synthetic polyproline with electron spins localized on attached molecular side groups separated by a few nanometers. We demonstrate the collective readout and coherent manipulation of very few (<= 6) of these S= 1/2 electronic spin systems and access their direct dipolar coupling tensor. Our results show that it is feasible to use spin-labeled peptides as a resource for a molecular qubit-based network, while at the same time providing simple optical readout of single quantum states through NV magnetometry. This work lays the foundation for building arbitrary quantum networks using well-established chemistry methods, which has many applications ranging from mapping distances in single molecules to quantum information processing.

• 出版日期2017-8
• 单位中国科学技术大学; 中国科学院