Photonic circuits for single rare-earth emitters

• Applicant: Dr. Roman Kolesov
• Subject Area: Experimental Condensed Matter Physics
• Term: from 2014 to 2018
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 262528081

• Final Report Year: 2018

Final Report Abstract

The main goal of the project was to devise a scalable way of producing on-chip photonic structures for rare-earth emitters. The most important structures are high-finesse optical resonators of low mode volume with the aim of realization of rare-earth-based cavity quantum electrodynamics system with strong coupling regime between the resonator and the rare-earth ions. Within the framework of the project, on-chip whispering gallery cavities with high quality factor (Q>150000) and low mode volume (V<303) were demonstrated using thin films of amorphous titania (TiO2) and lithium niobate (LiNbO3). The latter was also shown to be widely electrically tunable (>200GHz). Coupling of various rare-earth emitters produced by ion implantation to the cavities was demonstrated. The implantation yield of rare-earth ions was assessed and appeared to be unprecedentedly high (up to 91%). Coherent optical and spin properties of implanted and native rare-earth ions in crystals were studied. The combined results of the project show excellent potential of rare-earth-based cavity QED systems as quantum computer qubits as well as single photon sources for quantum communication.

Publications

• “All-Optical Preparation of Coherent Dark States of a Single Rare Earth Ion Spin in a Crystal”. Phys. Rev. Lett. 115, 093602 (2015)
  K. Xia, R. Kolesov, Y. Wang, P. Siyushev, R. Reuter, T. Kornher, N. Kukharchyk, A.D. Wieck, B. Villa, S. Yang, and J. Wrachtrup
  
• “Creation of fluorescent Cerium-Dopants in YAG by Ion Implantation” DPG Spring Meeting 2015, Heidelberg, 23-27.03.2015
  T.Kornher
  
• “Spectroscopy of single Ce ions in YAG” 12th International Conference on Hole Burning, Single Molecule and Related Spectroscopies: Science and Applications, Tartu, Estonia, 24–27.08.2015
  K. Xia
  
• “Production yield of rare-earth ions implanted into an optical crystal”. Appl. Phys. Lett. 108, 053108 (2016)
  T. Kornher, K. Xia, R. Kolesov, N. Kukharchyk, R. Reuter, P. Siyushev, R. Stöhr, M. Schreck, H.- W. Becker, B. Villa, A.D. Wieck, and J. Wrachtrup
  
• “Amorphous Silicon-Doped Titania Films for on-Chip Photonics”. ACS Photonics 4, 1101(2017)
  T. Kornher, K. Xia, R. Kolesov, B. Villa, S. Lasse, C.S. Sandu, E. Wagner, S. Harada, G. Benvenuti, H.-W. Becker, and J. Wrachtrup
  
• “Spectroscopy of single rare earth solid-state qubits” Quantum Information Workshop 2017, Hong Kong, 07-09.07.2017
  K.Xia
  
• “Superresolution Microscopy of Single Rare-Earth Emitters in YAG and H3 Centers in Diamond”. Phys. Rev. Lett. 120, 033903 (2018)
  R. Kolesov, S. Lasse, C. Rothfuchs, A. D. Wieck, K. Xia, T. Kornher, and J. Wrachtrup