News

28.02.2016 - 16:54

Q.com article in the „Physik in unserer Zeit“

A recent open-access article by research partners from the BMBF Q.com Research Network project entitled "Sichere Kommunikation per Quantenrepeater" is published in "Physik in unserer Zeit", which reports on the current state and the main challenges in this field.

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12.12.2015 - 12:00

3rd OCL-TP Workshop

On 10-11th December, the 3rd International Workshop between the "Optical Communication Lab" and the Department "Technological Physics" took place under framework of long-term cooperation agreement between the Israel Institute of Technology and the University of Kassel.

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23.07.2015 - 16:54

OCL-TP Workshop

On 22-23rd July, the 2nd International Workshop between the "Optical Communication Lab" and the Department "Technological Physics" took place under framework of long-term cooperation agreement between the Israel Institute of Technology and the University of Kassel.

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Towards Quantum Repeater Based on Color Centers in Diamond Nanostructures

In recent years much progress has been made toward the realization of quantum information processing (QIP) based upon nitrogen-vacancy (NV) centers in diamond formed by a two-point defect in the diamond lattice: a substitutional nitrogen atom and a vacancy trapped at an adjacent lattice position. For example, long ground state electron spin coherence times have been observed, full electron spin control has been achieved using optically-detected magnetic resonance, and electron-nuclear qubit transfer, necessary for long quantum memory times, has been performed. However, such demonstrations so far have involved manipulation only of isolated NV centers.
 
For realization of large-scale QIP or for quantum repeaters it will be necessary to connect NV centers together through “flying" qubits such as photons, i.e. ensembles or at least pairs of NV centers are required. To achieve this, optical structures in diamond such as microcavities and waveguides are needed to enable transfer of quantum information between the electron spin of the NV center and a photon. In general there are two approaches to couple NV centers to an optical device. The first one is to couple NV centers in a diamond nanoparticle to a microcavity, e.g. in SiO2. The second approach includes the fabrication of optical structures out of diamond.

The coupling of NV centers to diamond optical devices is one of the major tasks of our current research in frame of the BMBF Q.com-H project with the investigation of the possibility for its application as quantum repeater.



                 




Project Partners

  • Prof. Jorg Wrachtrup, 3. Physikalisches Institut, University of Stuttgart, Germany
  • Prof. Fedor Jelezko, PD Dr. Boris Naydenov, Institute of Quantum Optics, University of Ulm, Germany
  • Prof. Meir Orenstein, Technion, Haifa, Israel

Selected publications

  • C. Popov, E. Petkov, C. Petkov, F. Schnabel, J.P. Reithmaier, B. Naydenov, F. Jelezko, Quantum information technology based on diamond: A step towards secure information transfer, In: “Nanoscience Advances in CBRN Agent Detection, Information and Energy Security”, P. Petkov, D. Tsiulyanu, W. Kulisch and C. Popov (Eds.), NATO Science for Peace and Security Series - A: Chemistry and Biology, Springer, Dordrecht, Netherlands, 2015 (ISBN 978-94-017-9696-5) pp. 519-530.

Picture gallery

Physica Status Solidi B cover (January 2013)
Fig. 1: Physica Status Solidi B cover (January 2013)
PL spectrum of NCD nanopillar
Fig. 2: PL spectrum of NCD nanopillar
Diamond nanocrystallites with NV centers grown on pre-patterned Si substrate
Fig. 3: Diamond nanocrystallites with NV centers grown on pre-patterned Si substrate
Photonic crystal structure in NCD membrane
Fig. 4: Photonic crystal structure in NCD membrane
Fluorescence of NCD photonic crystal
Fig. 5: Fluorescence of NCD photonic crystal
Schema of a SiV center in the diamond crystal lattice
Fig. 6: Schema of a SiV center in the diamond crystal lattice
Schematic diagram of the fabrication process of diamond nanopillars with incorporated SiV centers
Fig. 7: Schematic diagram of the fabrication process of diamond nanopillars with incorporated SiV centers
Confocal images showing the fluorescence of arrays of diamond nanopillars with diameters of 1 µm (a) and 100 nm (b)
Fig. 8: Confocal images showing the fluorescence of arrays of diamond nanopillars with diameters of 1 µm (a) and 100 nm (b)
Integration of quantum dots with NCD layer
Fig. 9: Integration of quantum dots with NCD layer
NCD layer on top of GaAs substrates with surface and buried quantum dots
Fig. 10: NCD layer on top of GaAs substrates with surface and buried quantum dots

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