Improved light-matter interaction for storage of quantum states of light in a thulium-doped crystal cavity
J.H. Davidson (University of Calgary, TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft, TU Delft - QID/Tittel Lab)
Pascal Lefebvre (University of Calgary)
Jun Zhang (University of Calgary)
Daniel Oblak (University of Calgary)
W. Tittel (TU Delft - QID/Tittel Lab, TU Delft - Quantum Communications Lab, TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft)
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Abstract
We design and implement an atomic frequency comb quantum memory for 793-nm wavelength photons using a monolithic cavity based on a thulium- (Tm-) doped Y3Al5O12 crystal. Approximate impedance matching results in the absorption of 90% of input photons and a memory efficiency of (27.5±2.7)% over a 500-MHz bandwidth. The cavity enhancement leads to a significant improvement over the previous efficiency in Tm-doped crystals using a quantum memory protocol. In turn, this allows us to store and recall quantum states of light in such a memory. Our results demonstrate progress toward efficient and faithful storage of single-photon qubits with a large time-bandwidth product and multimode capacity for quantum networking.