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Q: Fachverband Quantenoptik und Photonik

Q 13: Posters: Quantum Optics and Photonics I

Q 13.48: Poster

Montag, 9. März 2020, 16:30–18:30, Empore Lichthof

Reduction of spectral diffusion by applying a sequence of optical control pulses — •Laura Orphal-Kobin¹, Joseph H. D. Munns¹, and Tim Schröder^{1, 2} — ¹Department of Physics, Humboldt-Universität zu Berlin, Berlin, Germany — ²Ferdinand-Braun-Institut, Berlin, Germany

A quantum network could be realized by photon-mediated entanglement between stationary quantum bits (qubits). For the generation of coherent photons, enabling efficient entanglement operations, lifetime limited emission linewidths are a fundamental requirement.

However, for the negatively charged NV defect centre in diamond, natural linewidths (∼13 MHz) are challenging to achieve. In addition to homogeneous broadening, in particular the change of the optical transition frequency over time caused by fluctuations of the electrostatic environment leads to inhomogeneous broadening of the zero-phonon emission line (ZPL), which is referred to spectral diffusion.

While work is done on optimizing nanostructure designs and nanofabrication methods, active control schemes could be an interesting alternative to suppress spectral diffusion. Pulsed coherent control schemes are expected to modify the average rate of phase accumulated between the emitter states. By applying a sequence of optical π-pulses the ZPL could be stabilized at a target frequency given by the carrier frequency of the pulses.

Here, we present our work towards experimentally implementing an optical control protocol for reducing spectral diffusion of the ZPL of NV defect centres.