Laser-written waveguide-integrated coherent spins in diamond
Yanzhao Guo,
John P. Hadden,
Federico Gorrini,
Giulio Coccia,
Vibhav Bharadwaj,
Vinaya Kumar Kavatamane,
Mohammad Sahnawaz Alam,
Roberta Ramponi,
Paul E. Barclay,
Andrea Chiappini,
Maurizio Ferrari,
Alexander Kubanek,
Angelo Bifone,
Shane M. Eaton,
Anthony J. Bennett
Affiliations
Yanzhao Guo
School of Engineering, Cardiff University, Queen’s Buildings, The Parade, Cardiff CF24 3AA, United Kingdom
John P. Hadden
School of Engineering, Cardiff University, Queen’s Buildings, The Parade, Cardiff CF24 3AA, United Kingdom
Federico Gorrini
Department of Molecular Biotechnology and Health Sciences, University of Torino, Via Nizza 52, 10126 Torino, Italy
Giulio Coccia
Department of Physics, Politecnico di Milano, Piazza Leonardo da Vinci, 32, 20133 Milano, Italy
Vibhav Bharadwaj
Institute for Photonics and Nanotechnologies (IFN-CNR), Piazza Leonardo da Vinci, 32, 20133 Milano, Italy
Vinaya Kumar Kavatamane
Institute for Quantum Science and Technology, University of Calgary, Calgary, Alberta T2N 1N4, Canada
Mohammad Sahnawaz Alam
Institute of Theoretical Physics, Wrocław University of Science and Technology, 50-370 Wrocław, Poland
Roberta Ramponi
Department of Physics, Politecnico di Milano, Piazza Leonardo da Vinci, 32, 20133 Milano, Italy
Paul E. Barclay
Institute for Quantum Science and Technology, University of Calgary, Calgary, Alberta T2N 1N4, Canada
Andrea Chiappini
Institute of Photonics and Nanotechnology of the National Research Council (IFN-CNR), Characterization and Development of Materials for Photonics and Optoelectronics (CSMFO) and The Centre for Materials and Microsystems (FBK-CMM), 38123 Trento, Italy
Maurizio Ferrari
Institute of Photonics and Nanotechnology of the National Research Council (IFN-CNR), Characterization and Development of Materials for Photonics and Optoelectronics (CSMFO) and The Centre for Materials and Microsystems (FBK-CMM), 38123 Trento, Italy
Alexander Kubanek
Institute for Quantum Optics, Ulm University, D-89081 Ulm, Germany
Angelo Bifone
Department of Molecular Biotechnology and Health Sciences, University of Torino, Via Nizza 52, 10126 Torino, Italy
Shane M. Eaton
Institute for Photonics and Nanotechnologies (IFN-CNR), Piazza Leonardo da Vinci, 32, 20133 Milano, Italy
Anthony J. Bennett
School of Engineering, Cardiff University, Queen’s Buildings, The Parade, Cardiff CF24 3AA, United Kingdom
Quantum emitters, such as the negatively charged nitrogen-vacancy center in diamond, are attractive for quantum technologies, such as nano-sensing, quantum information processing, and as a non-classical light source. However, it is still challenging to position individual emitters in photonic structures while preserving the spin coherence properties of the defect. In this paper, we investigate single and ensemble waveguide-integrated nitrogen-vacancy centers in diamond fabricated by femtosecond laser writing followed by thermal annealing. Their spin coherence properties are systematically investigated and are shown to be comparable to native nitrogen-vacancy centers in diamond. This method paves the way for the fabrication of coherent spins integrated within photonic devices.
