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Overview:

Overview:. Motivation Cavities Single Emitters Outlook. Qubits:. Photons (polarization) Atom (2 energy levels) Color Center Quantum dots Josephson junctions …. Quantum Computation & Communication. Instead of classical bits using qubits = quantum mechanical 2 level system. flying.

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Overview:

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  1. Overview: • Motivation • Cavities • Single Emitters • Outlook

  2. Qubits: • Photons (polarization) • Atom (2 energy levels) • Color Center • Quantum dots • Josephson junctions • … Quantum Computation & Communication Instead of classical bits using qubits = quantum mechanical 2 level system flying stationary Network: Problem: Low cross-section Between photon and atom

  3. Cavity QED Jaynes Cummings Model: absorbtion of photon emission of photon energy of atom energy of cavity

  4. Weak Coupling Still interesting Purcelleffekt: Enhancement of sponteneous emission rate • cavity changes vacuum field („offering the emitter distinguished modes“) • shorter lifetime of excited level of the emitter and emission in certain modes (i.e. the direction is fixed) • Enhancement rate is described by the Purcell factor

  5. optical fiber flat dielectric mirror Some Numbers: curved dielectric mirror • Diameter of Fiber: 125 mm • Radius of curvature: 140 or 380 mm • Cavity length: 5 - 10 mm • Reflectivity of curved mirror: 98.5% • Reflectivity of flat mirror: 99.7% Cavities

  6. Fiber glued to Microlens Array by some UV-curing glue Microlens- Array Drop of glue fiber ripped off coating Fabrication of the fibers Coated Microlens array

  7.  Finesse  130 Voltage applied to Piezo which moves flat mirror Signal on Photodiode Some Measurements

  8. Single Emitter:Nitrogen-Vacency in Diamond

  9. Single Emitter?

  10. Summery/Outlook • So far very promising results • Realization of Cavities • Observation of Single Emitters • Next steps: • Sample with reduced density of nanodiamonds •  Lower background • Alternative Fiber production (shaping with an Ar+-Laser) in cooperation with the group of Jakob Reichel (Paris) •  Smaller cavities • Putting the diamonds in the cavity

  11. THANK YOU FOR YOUR ATTENTION!

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