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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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INA - Technological Physics > Research > Nano Diamond > Projects Quantum Coins and Nano Sensors

Quantum Coins and Nano Sensors

We aim at fabrication and testing of devices from polycrystalline diamond targeting two main applications: The development of dedicated quantum memory for quantum coins implementation and quantum sensing of magnetic fields. With the deterministic nano-implantation system we will integrate nuclear spins next to color centers such that long lived quantum states can be stored. Low-cost polycrystalline diamond fabrication expertise and nano-structuring facilities allow us to tackle the full production chain of the final device. The theory partners in Kassel will enhance the protection of the quantum coin by identifying decoherence-free subspaces (DFS). This improves the quality of the quantum coin but also allows for the realization of sensors that are protected against environmental noise with increased sensitivity to signals outside of the DFS, providing the design principle for sensitive and selective nano-gradient sensors. The theory partner in Erlangen will focus on quantum and classical protocols to implement a robust quantum device. They will develop protocols based on redundancy and error correction specifically optimized for this application.


Project Partners

  • Prof. Kilian Singer, Institute of Physics, Light-Matter Interactions, University of Kassel
  • Prof. Ferdinand Schmidt-Kaler, Institute of Physics, University of Mainz
  • Prof. Christiane Koch, Institute of Physics, Theoretical Physics, University of Kassel
  • Prof. Eric Lutz, Institute of Theoretical Physics, University of Erlangen-Nürnberg

Picture gallery

Diamond AFM with NV color center at tip apex: quantum coin consisting of NV centers (red) with neighboring nuclear spin (black) for long-term qubit storage; Tailored microwave fields for entanglement generation between the spins at the tip
Fig. 1: Diamond AFM with NV color center at tip apex: quantum coin consisting of NV centers (red) with neighboring nuclear spin (black) for long-term qubit storage; Tailored microwave fields for entanglement generation between the spins at
Silicon-vacancy color center in a waveguide for efficient fiber coupling
Fig. 2: Silicon-vacancy color center in a waveguide for efficient fiber coupling
SiV center used for entanglement generation, the state subsequently written into the nuclear spin, readout performed at RT by virtue of the coupled NV center
Fig. 3: SiV center used for entanglement generation, the state subsequently written into the nuclear spin, readout performed at RT by virtue of the coupled NV center

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