Quantum networks rely on the efficient coupling of coherent quantum memories to photonic links. Tin-vacancy centers (SnV) have emerged as promising candidates for the implementation of an optically interfaced quantum memory based on their long spin coherence times at temperatures above 1K. To enhance their interaction with photons SnV centers need to be integrated with high-quality photonic structures. In this work, we report the enhancement of coherent emission of SnV centers by coupling them to a nanophotonic waveguide resonator. We observe strong intensity enhancement of the photon emission when the cavity is resonant with the color center. We demonstrate strong enhancement of the radiative recombination rate of SnV centers resulting in their predominant emission via the coherent zero-phonon line and into the cavity mode. These results are a significant step toward color-center-based quantum information processing applications without the need for dilution refrigerators.
Building quantum networks requires efficient coupling of solid-state quantum emitters to photonic devices. Tinvacancy center (SnV) has attracted much interest for having long spin coherence times at temperatures above 1 K. Employing SnV as an optically addressable qubit requires integration with photonic structures to both route the emitted photons and enhance the light-matter interaction. We present incorporation of high-quality SnV centers with narrow linewidths in suspended diamond waveguides. Furthermore, we fabricate photonic crystal cavities in diamond with embedded SnV centers. We observe strong intensity enhancement of the photon emission when the cavity is resonant with the color center. Time-resolved photoluminescence measurements confirm that this effect is due to radiative Purcell enhancement of the spontaneous emission. Finally, we demonstrate Stark tuning of transition frequency of SnV centers, essential for multiemitter applications. These results are a significant step toward color-center-based quantum information processing applications without the need for dilution refrigerators.
We propose a new architecture of metal-insulator-metal devices for solar energy harvesting at infrared and visible
frequencies based on asymmetrical alignment of insulating barrier relative to the Fermi level of metals and spatial
localization of hot electrons excited by photons. Photons absorbed by metals create hot electrons, which can transmit
through the thin insulating barrier, producing current. We theoretically investigated the photocurrent response and power
generations at different wavelengths. Short circuit current and open circuit voltage can be easily tuned by changing metal
thicknesses to adjust the forward and reverse photocurrent. By employing surface plasmons, power generation efficiency
is enhanced 9 times in a grating MIM device compared to direct illumination at 650 nm. Finally, we compared the
enhancement of power generation efficiency by SPs excited through grating structure and Kretschmann coupling system.
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