Individual control and readout of qubits in a sub-diffraction volume

• Main Authors: Bersin, Eric Alexander (Author), Walsh, Michael E (Author), Mouradian, Sara L (Author), Trusheim, Matthew E (Author), Schroder, Tim (Author), Englund, Dirk R. (Author)
• Other Authors: Massachusetts Institute of Technology. Research Laboratory of Electronics (Contributor), Massachusetts Institute of Technology. Institute for Soldier Nanotechnologies (Contributor), Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science (Contributor)
• Format: Article
• Language: English
• Published: Springer Science and Business Media LLC, 2021-02-03T12:56:18Z.
• Subjects: Article
• Online Access: Get fulltext

Medium-scale ensembles of coupled qubits offer a platform for near-term quantum technologies as well as studies of many-body physics. A central challenge for coherent control of such systems is the ability to measure individual quantum states without disturbing nearby qubits. Here, we demonstrate the measurement of individual qubit states in a sub-diffraction cluster by selectively exciting spectrally distinguishable nitrogen vacancy centers. We perform super-resolution localization of single centers with nanometer spatial resolution, as well as individual control and readout of spin populations. These measurements indicate a readout-induced crosstalk on non-addressed qubits below 4 × 10−2. This approach opens the door to high-speed control and measurement of qubit registers in mesoscopic spin clusters, with applications ranging from entanglement-enhanced sensors to error-corrected qubit registers to multiplexed quantum repeater nodes.
National Science Foundation (U.S.) (Grant DMR-1231319)
European Commission. Framework Programme for Research and Innovation. Marie Sklodowska-Curie Actions (Agreement 753067 OPHOCS)
Germany. Federal Ministry of Education and Research ((BMBF, DiNOQuant, Project 13N14921)
United States. Air Force. Office of Scientific Research. Multidisciplinary University Research Initiative (Optimal Measurements for Scalable Quantum Technologies FA9550-14-1-0052)
United States. Air Force. Office of Scientific Research (Grant FA9550-16-1-0391)