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

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

Type: Bachelor thesis
Title: Magnetic-field enhanced coherence in Ytterbium-doped ring resonators at millikelvin temperatures
Author: van Driel, David
Issue Date: 2016
Keywords: Tunneling States
Solid State Physics
Quantum Matter
Quantum Optics
Lasers
Low Temperature
Ytterbium
Cavity Quantum Dynamics
Quantum Memory
Abstract: 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.
Supervisor: Loeffler, WolfgangBouwmeester, Dirk
Faculty: Faculty of Science
Department: Physics (Bachelor)
Specialisation: Quantum Matter & Optics
ECTS Credits: 3
Handle: http://hdl.handle.net/1887/43171
 

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