2018/01/31 by Emma L. Rosenfeld, Emma Rosenfeld, Linh M. Pham +4 · 1 citation
Engineering · Materials Science · Physics and Astronomy · #Atomic physics #Coherent control #Condensed matter physics #Diamond and Carbon-based Materials Research #Electron #Electronic and Structural Properties of Oxides #Nitrogen-vacancy center #Physics #Quantum #Quantum mechanics #Semiconductor materials and devices #Spin (aerodynamics) #Spins #cond-mat.mes-hall #quant-ph
paper · pdf · doi:10.1103/physrevlett.120.243604
published as Phys. Rev. Lett. 120, 243604 (2018)
arxiv created 2018/06/14 · openalex publication_date 2018/06/15 · arxiv updated 2018/06/20 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We observe coherent spin exchange between identical electronic spins in the solid state, a key step towards full quantum control of electronic spin registers in room temperature solids. In a diamond substrate, a single nitrogen vacancy (NV) center coherently couples to two adjacent S=1/2 dark electron spins via the magnetic dipolar interaction. We quantify NV-electron and electron-electron couplings via detailed spectroscopy, with good agreement to a model of strongly interacting spins. The electron-electron coupling enables an observation of coherent flip-flop dynamics between electronic spins in the solid state, which occur conditionally on the state of the NV. Finally, as a demonstration of coherent control, we selectively couple and transfer polarization between the NV and the pair of electron spins. Our observations enable the realization of fast quantum gate operations and quantum state transfer in a scalable, room temperature, quantum processor.