Freiburg 2019 – scientific programme
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FM: Fall Meeting
FM 83: Poster: Enabling Technologies Sources of Quantum States of Light
FM 83.6: Poster
Thursday, September 26, 2019, 16:30–18:30, Tents
Reduction of spectral diffusion by applying a sequence of optical control pulses — •Laura Orphal1, Joseph H. D. Munns1, and Tim Schröder1,2 — 1Department of Physics, Humboldt-Universität zu Berlin, Berlin, Germany — 2Ferdinand-Braun-Institut, Berlin, Germany
Lifetime limited emission linewidths are a fundamental requirement for the generation of coherent photons, which are crucial for efficient entanglement of stationary qubits in quantum information systems.
However, for the negatively charged nitrogen-vacancy centre (NV) in diamond, natural linewidths (∼13 MHz) are challenging to achieve. In addition to homogeneous broadening, in particular, spectral diffusion, i.e., the change of optical transition frequency over time, caused by fluctuations of the electrostatic environment, leads to an inhomogeneous broadening of the zero-phonon emission line (ZPL).
While work is done on optimizing material properties, active control schemes are an interesting alternative to suppress spectral diffusion. Recently the approach of pulsed coherent control was proposed [1]. A sequence of optical π-pulses is expected to modify the average rate of phase accumulated between the emitter states, affecting the emission spectrum. In this way the ZPL can be stabilized at a chosen frequency given by the carrier frequency of the pulses.
Here, we present our work towards experimentally implementing the protocol for reducing spectral diffusion of the ZPL of NV defect centres by applying a sequence of optical control pulses.
[1] H. F. Fotso et al., Phys. Rev. Lett. 116, 033603 (2016)