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Institut für Quantenoptik

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Preprints

  • Patrick Maier, Alexander Kubanek. Extracting Membrane-like hexagonal Boron Nitride hosting single Defect Centers for Resonator Integration. (2025)
  • Jiaxu Liang, Christopher P. Ender, Nancy C. Forero-Martinez, Jingyi Liu, Xin Yang, Raul Gonzalez Brouwer, Lev Kazak, Yizhi Liu, Tobias Eklund, Mangalika Sinha, Sarah Köster, Shrikant Bhat, Fabian Rohmann, Andreas Tangemann, Kilian Lee Gallo, Rüdiger Berger, Robert Farla, Alexander Kubanek, Katrin Amann-Winkel, Manfred Wagner, Fedor Jelezko, Klaus Müllen, Robinson Cortes-Huerto, Yingke Wu, Tanja Weil. Bottom-up Synthesis of Molecular and Fluorescent Nanodiamonds from Nanographene. (2025)

2026

  • Marco Klotz, Andreas Tangemann, David Opferkuch, Alexander Kubanek. Bipartite entanglement in a nuclear spin register mediated by a quasi-free electron spin. (2026)

 

2025

  • Selene Sachero, Robert Berghaus,  Florian Feuchtmayr, Niklas Lettner, Patrick Maier, Elena Nieto Hernandez, Sviatoslav Ditalia Tchernij, Alexander Kubanek. Tunable cavity coupling of a single SnV− center in nanodiamond across bad-emitter and bad-cavity regimes. (2025)
  • Selene Sachero, Richard Waltrich, Emilio Corte, Sviatoslav Ditalia Tchernij, Alexander Kubanek. Creation of Negatively Charged GeV and SnV centers in Nanodiamonds via Ion Implantation. (2025)
  • Patrick Maier, Simon Rupp, Niklas Lettner, Johannes Hecker Denschlag, and Alexander Kubanek, Fabrication of customized low-loss optical resonators by combination of FIB-milling and CO2 laser smoothing. Opt. Express 33, 19205-19219 (2025)
  • M. Klotz, A. Tangemann and A. Kubanek. Ultra-high strained diamond spin register with coherent optical control. (2025)
  • S. Shahbazi, G. Coccia, J. Lang, V. Bharadwaj, F. Jelezko, R. Ramponi, A. J. Bennett, J. P. Hadden, S. M. Eaton and A. Kubanek. Vector magnetometry using shallow implanted NV centers in diamond with waveguide-assisted dipole excitation and readout. (2024)
  • R. Berghaus, S. Sachero, G. Bayer, J. Heupel, T. Herzig, F. Feuchtmayr, J. Meijer, C. Popov and A. Kubanek. Cavity-Enhanced Emission and Absorption of Color Centers in a Diamond Membrane With Selectable Strain. (2025)

2024

  • M. K. Koch, V. Bharadwaj und A. Kubanek. Probing the limits for coherent optical control of a mechanically decoupled defect center in hexagonal boron nitride. (2024)
  • M.S. Alam, F. Gorrini, M. GaweÅ‚czyk, D. Wigger, G. Coccia, Y. Guo, S. Shahbazi, V. Bharadwaj, A. Kubanek, R. Ramponi, P. E. Barclay, A. J. Bennett, J. P. Hadden, A. Bifone, S. M. Eaton, P.  Machnikowski. Determining strain components in a diamond waveguide from zero-field optically detected magnetic resonance spectra of negatively charged nitrogen-vacancy-center ensembles.  .
  • M. Klotz, R. Waltrich, N. Lettner, V. Agafonov und A. Kubanek. Strongly coupled spins of silicon-vacancy centers inside a nanodiamond with sub-megahertz linewidth. .
  • L. Antoniuk, N. Lettner, A. P. Ovvyan, S. Haugg, M. Klotz, H. Gehring, D. Wendland, V. N. Agafonov, W. H. P. Pernice und A. Kubanek. All-optical spin access via a cavity-broadened optical transition in on-chip hybrid quantum photonics.
  • N. Lettner, L. Antoniuk, A. P. Ovvyan, H. Gehring, D. Wendland, V. N. Agafonov, W. H. P. Pernice und A. Kubanek. Controlling all Degrees of Freedom of the Optical Coupling in Hybrid Quantum Photonics.
  • B. Lubotzky, A. Nazarov, H. Abudayyeh, L. Antoniuk, N. Lettner, V. Agafonov, A. V. Bennett, S. Majumder, V. Chandrasekaran, E. G. Bowes, H. Htoon, J. A. Hollingsworth, A. Kubanek und R. Rapaport. Room-Temperature Fiber-Coupled Single-Photon Sources based on Colloidal Quantum Dots and SiV Centers in Back-Excited Nanoantennas.

2023

  • G. Bayer, R. Berghaus, S. Sachero, A. B. Filipovski, L. Antoniuk, N. Lettner,
    R. Waltrich, M. Klotz, P. Maier, V. Agafonov und A. Kubanek. Optical driving, spin initialization and readout of single SiV− centers in a Fabry-Perot resonator. .
  • R. Waltrich, M. Klotz, V. N. Agafonov und A. Kubanek. Two-photon interference from silicon-vacancy centers in remote nanodiamonds.
  • F. Feuchtmayr, R. Berghaus, S. Sachero, G. Bayer, N. Lettner, R. Waltrich, P. Maier, V. Agafonov and A. Kubanek. Enhanced Spectral Density of a Single Germanium Vacancy Center in a Nanodiamond by Cavity-Integration.
  • K. Sharman, O. Golami, S. Christopher Wein, H. Zadeh-Haghighi, C. Gomes da Rocha, A. Kubanek, C. Simon. A DFT study of electron–phonon interactions for the C2CN and VNNB defects in hexagonal boron nitride: investigating the role of the transition dipole direction.
  • E. Hernández, E. Redolfi, C. Stella, G. Andrini, E. Corte, S. Sachero, S. Tchernij, F. Picariello, T. Herzig, Y. Borzdov, I. Kupriyanov, A. Kubanek, P. Olivero, J. Meijer, P. Traina, Y. Palyanov, J. Forneris. Efficiency Optimization of Ge-V Quantum Emitters in Single-Crystal Diamond upon Ion Implantation and HPHT Annealing. 

2022

  • A. Kubanek, A. P. Ovvyan, L. Antoniuk, N. Lettner, and W. H. P. Pernice. Hybrid Quantum Nanophotonics: Interfacing Color Center in Nanodiamonds with Si3N4-Photonics. In:
  • A. Kubanek. Coherent Quantum Emitters in Hexagonal Boron Nitride.
  • M. Klotz, K. G. Fehler, R. Waltrich, E. S. Steiger, S. Häußler, P. Reddy, L. F. Kulikova, V. A. Davydov, V. N. Agafonov, M. W. Doherty, and A. Kubanek. Prolonged Orbital Relaxation by Locally Modified Phonon Density of States for the SiV- Center in Nanodiamonds.
  • M. Hoese, M. K. Koch, F. Breuning, N. Lettner, K. G. Fehler, and A. Kubanek. Single photon randomness originating from the symmetric dipole emission pattern of quantum emitters.
  • A. N. Giakoumaki, G. Coccia, V. Bharadwaj, J. P. Hadden, A. J. Bennett, B. Sotillo, R. Yoshizaki, P. Olivero, O. Jedrkiewicz, R. Ramponi, S. M. Pietralunga, M. Bollani, A. Bifone, P. E. Barclay, A. Kubanek, and S. M. Eaton. Quantum technologies in diamond enabled by laser processing.
  • M. K. Koch, M. Hoese, V. Bharadwaj, J. Lang, J. P. Hadden, R. Ramponi, F. Jelezko, S. M. Eaton, and A. Kubanek. Super-Poissonian Light Statistics from Individual Silicon Vacancy Centers Coupled to a Laser-Written Diamond Waveguide.

2021

  • R. Waltrich, B. Lubotzky, H. Abudayyeh, E. S. Steiger, K. G. Fehler, N. Lettner, V. A. Davydov, V. N. Agafonov, R. Rapaport, and A. Kubanek. High-purity single photons obtained with moderate-NA optics from SiV center in nanodiamonds on a bullseye antenna.
  • K. G. Fehler, L. Antoniuk,  N. Lettner, A. P. Ovvyan, R. Waltrich, N. Gruhler, V. A. Davydov, V. N. Agafonov, W. H. P. Pernice, and A. Kubanek. Hybrid Quantum Photonics Based on Artificial Atoms Placed Inside One Hole of a Photonic Crystal Cavity.
  • S. Häußler, G. Bayer, R. Waltrich, N. Mendelson, C. Li, D. Hunger, I. Aharonovich, and A. Kubanek. Tunable Fiber-Cavity Enhanced Photon Emission from Defect Centers in hBN.
  • M. Hoese, M. K. Koch, V. Bharadway, J. Lang, J. P. Hadden, R. Yoshizaki, A. N. Giakoumaki, R. Ramponi, F. Jelezko, S. M. Eaton, and A. Kubanek. Integrated Magnetometry Platform with Stackable Waveguide-Assisted Detection Channels for Sensing Arrays.

2020

  • M. Hoese, P. Reddy, A. Dietrich, M. K. Koch, K. G. Fehler, M. W. Doherty, and A. Kubanek. Mechanical decoupling of quantum emitters in hexagonal boron nitride from low-energy phonon modes. 
  • K. G. Fehler, A. P. Ovvyan, L. Antoniuk, N. Lettner, N. Gruhler, V. A. Davydov, V. N. Agafonov, W. H. P. Pernice, and A. Kubanek. Purcell-enhanced emission from individual SiV− center in nanodiamonds coupled to a Si3N4-based, photonic crystal cavity.
  • H. Siampour, O. Wang, V. A. Zenin, S. Boroviks, P. Siyushev, Y. Yang, V. A. Davydov, L. F. Kulikova, V. N. Agafonov, A. Kubanek, N. A. Mortensen, F. Jelezko, and S. I. Bozhevolnyi. Ultrabright single-photon emission from germanium-vacancy zero-phonon lines: deterministic emitter-waveguide interfacing at plasmonic hot spots.
  • J. Lang, S. Häußler, J. Fuhrmann, R. Waltrich, S. Laddha, J. Scharpf, A. Kubanek, B. Naydenov, and F. Jelezko. Long optical coherence times of shallow-implanted, negatively charged silicon vacancy centers in diamond. 
  • A. Dietrich, M. W. Doherty, I. Aharonovich, and A. Kubanek. Solid-state single photon source with Fourier transform limited lines at room temperature.

2019

  • S. Häußler, L. Hartung, K. G. Fehler, L. Antoniuk, L. F. Kulikova, V. A. Davydov, V. N. Agafonov, F. Jelezko, and A. Kubanek. Preparing single SiV- center in nanodiamonds for external, optical coupling with access to all degrees of freedom.
  • K. G. Fehler, A. P. Ovvyan, N. Gruhler, W. H. P. Pernice, and A. Kubanek. Efficient Coupling of an Ensemble of Nitrogen Vacancy (NV-) to the Mode of a High-Q, Si3N4 Photonic Crystal Cavity.
  • S. Häußler, J. Benedikter, K. Bray, B. Regan, A. Dietrich, J. Twamley, I. Aharonovich, D. Hunger, and A. Kubanek. Diamond photonics platform based on silicon vacancy centers in a single-crystal diamond membrane and a fiber cavity.
  • L. J. Rogers, O. Wang, Y. Liu, L. Antoniuk, C. Osterkamp, V. A. Davydov, V. N. Agafonov, A. B. Filipovski, F. Jelezko, and A. Kubanek. Single Si-V- Centers in Low-Strain Nanodiamonds with Bulklike Spectral Properties and Nanomanipulation Capabilities.

2018

  • A. Dietrich, M. Bürk, E. S. Steiger, L. Antoniuk, T. T. Tran, M. Nguyen, I. Aharonovich, F. Jelezko, and A. Kubanek. Observation of Fourier transform limited lines in hexagonal boron nitride. 
  • T. T. Tran, M. Kianinia, M. Nguyen, S. Kim, Z.-Q. Xu, A. Kubanek, M. Toth, and I. Aharonovich. Resonant Excitation of Quantum Emitters in Hexagonal Boron Nitride.

2017

  • S. Häußler, G. Thiering, A. Dietrich, N. Waasem, T. Teraji, J. Isoya, T. Iwasaki, M. Hatano, F. Jelezko, A. Gali, and A. Kubanek. Photoluminescence excitation spectroscopy of SiV- and GeV- color center in diamond.