Magnetic-field enhanced coherence in Ytterbium-doped ring resonators at millikelvin temperatures

Persistent URL of this record https://hdl.handle.net/1887/43171

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Natuurkunde (BSc)

Driel, David van (2016)

Magnetic-field enhanced coherence in Ytterbium-doped ring resonators at millikelvin temperatures

Bachelor thesis | Natuurkunde (BSc)

We measured the homogeneous linewidth $\Gamma_h$ of ytterbium atoms inside a whispering gallery mode ring resonator. Using two-pulse photon echoes, we looked at the temperature dependence of $\Gamma_h$ for an applied external magnetic field of $B=0$ and $B=0.3$ T. We found a clear narrowing of the linewidth at each temperature. Furthermore, we found saturation of $\Gamma_h$ for $T<30$ mK for both $B=0$ and $B=0.3$ T. At $T=10$ mK and $B=0.3$ T, we have observed a linewidth of 22 kHz, which is very near the lifetime limit of 1 kHz. Our results for the homogeneous linewidth of ions in glasses show that current theories have to be reconsidered. In addition, our results for $T_2$ ensure that rare earth element-doped cavities are a candidate for AFC quantum memory.

Cavity Quantum Dynamics

Quantum Memory