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The Japan Society of Applied Physics

Improving Photon Echo Generation Efficiency by Using Stacked Quantum Dots Embedded in Fabry-Pérot Resonator

和哉 笹生, Ryutaro Ide, Kouichi Akahane, Junko Hayase

Published Jul 10, 2019• 0 citations
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The protocol of optical quantum memory in the revival of silenced photon echo (ROSE) scheme is experimentally implemented in a Tm 3+ :Y 3 Al 5 O 12 crystal ( c = 0.1 at.%) placed in an impedance-matched optical Fabry–Perot resonator. The input signal recovery efficiency of ∼21 % is achieved for a light pulse with a storage time of 36 μs. The main sources of loss and their impact on the achieved quantum efficiency are discussed, as well as the advantages of the implemented scheme and the possibilities of the further improvement of the main parameters of quantum memory.
We have explored the coupling mechanism of a millimeter wave radiation to bicrystal Josephson junction arrays embedded in a Fabry–Perot resonator. In order to optimize the system, three-dimensional simulations and relative experiments were performed. By analyzing the results of computer simulations and experiments, we found that the layout of the array and the distance between the array and the plane mirror should minimize the effects on the electrical field E distribution in the fundamental mode of the Fabry–Perot resonator without the sample. In this case, the uniformity of the E field in the bicrystal arrays was demonstrated together with an improvement in the coupling efficiency of the mm wave irradiation to high-temperature superconductor arrays of Josephson junctions.