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.
- 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
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- J. Evtimova, W. Kulisch, C. Petkov, E. Petkov, F. Schnabel, J.P. Reithmaier, C. Popov, Reactive ion etching of nanocrystalline diamond for the fabrication of one-dimensional nanopillars, Diamond and Related Materials 36, 58-63 (2013).
- E. Petkov, T. Rendler, C. Petkov, F. Schnabel, J.P. Reithmaier, J. Wrachtrup, C. Popov, W. Kulisch, Investigation of NV centers in nano and ultrananocrystalline diamond pillars, physica status solidi (a) 210, 2066-2073 (2013).
- 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.
- N. Felgen, B. Naydenov, S. Turner, F. Jelezko, J.P. Reithmaier, C. Popov, Incorporation and study of SiV centers in diamond nanopillars, Diamond and Related Materials 64 (2016) 64-69.