Abstract:Lithium-niobate-on-insulator (LNOI) has emerged as a promising platform in the field of integrated photonics. Nonlinear optical processes and fast electro-optic modulation have been reported with outstanding performance in ultra-low loss waveguides. In order to harness the advantages offered by the LNOI technology, suitable fiber-to-chip interconnects operating at different wavelength ranges are demanded. Here we present easily manufacturable, self-imaging apodized grating couplers, featuring a coupling effici… Show more
“…It also provides strong mechanical support to increase the fabrication yield. Figure 1 d shows false color SEM images of the actual device, with a zoom-in view of the waveguide and the apodized grating coupler 38 used for fiber-to-chip coupling. Fig.…”
Rare earth emitters enable critical quantum resources including spin qubits, single photon sources, and quantum memories. Yet, probing of single ions remains challenging due to low emission rate of their intra-4f optical transitions. One feasible approach is through Purcell-enhanced emission in optical cavities. The ability to modulate cavity-ion coupling in real-time will further elevate the capacity of such systems. Here, we demonstrate direct control of single ion emission by embedding erbium dopants in an electro-optically active photonic crystal cavity patterned from thin-film lithium niobate. Purcell factor over 170 enables single ion detection, which is verified by second-order autocorrelation measurement. Dynamic control of emission rate is realized by leveraging electro-optic tuning of resonance frequency. Using this feature, storage, and retrieval of single ion excitation is further demonstrated, without perturbing the emission characteristics. These results promise new opportunities for controllable single-photon sources and efficient spin-photon interfaces.
“…It also provides strong mechanical support to increase the fabrication yield. Figure 1 d shows false color SEM images of the actual device, with a zoom-in view of the waveguide and the apodized grating coupler 38 used for fiber-to-chip coupling. Fig.…”
Rare earth emitters enable critical quantum resources including spin qubits, single photon sources, and quantum memories. Yet, probing of single ions remains challenging due to low emission rate of their intra-4f optical transitions. One feasible approach is through Purcell-enhanced emission in optical cavities. The ability to modulate cavity-ion coupling in real-time will further elevate the capacity of such systems. Here, we demonstrate direct control of single ion emission by embedding erbium dopants in an electro-optically active photonic crystal cavity patterned from thin-film lithium niobate. Purcell factor over 170 enables single ion detection, which is verified by second-order autocorrelation measurement. Dynamic control of emission rate is realized by leveraging electro-optic tuning of resonance frequency. Using this feature, storage, and retrieval of single ion excitation is further demonstrated, without perturbing the emission characteristics. These results promise new opportunities for controllable single-photon sources and efficient spin-photon interfaces.
“…One is vertical coupling of light onto a chip using a GC. 176,177,245,247,248,252,254,259,265,266,268,269 The other is based on edge coupling, 223,246,249,258 which couples light into a chip horizontally. According to the operation principle, GCs can also be divided into two categories, one is the one-dimensional (1D) GC and the other is the 2D GC, both of which have been demonstrated in the LN platform.…”
Section: Grating Couplermentioning
confidence: 99%
“…The typical coupling efficiency of a 1D GC is between −3 and −7 dB. 176,177,245,247,248,252,254,268,269 A 2D GC is more functional as it can realize the demultiplexing of orthogonal polarization multiplexed signals while coupling light into on-chip devices. 270 Although there are many reports about 2D GC in other material systems, similar research is very limited in TFLN.…”
“…2 a). The grating couplers act as spectral and polarizing filter, which provide an alignment-free approach to couple light in and out of the photonic circuit by converting the incident Gaussian-like free space mode into a guided mode [37]. Furthermore, they are fabricated in the same electron-beam lithography step as the photonic circuit on-chip and ensure a compact footprint and easy access to any device on the chip.…”
This chapter covers recent developments in the field of hybrid quantum photonics based on color centers in nanodiamonds and Si 3 N 4 -photonics towards a technology platform with applications in quantum information processing and quantum information distribution. The methodological approach can be divided in three main tasks. First, the fabrication and optimization of Si 3 N 4photonics. Second, the creation, characterization and control of color centers in nanodiamonds. Third, the assembly of hybrid quantum photonics by integrating the nanodiamonds into the photonic structures. One focus will be the efficient interfacing of the color centers done by optimizing the optical coupling. The chapter describes recent progress in all three steps and summarizes the established hybrid platform. We believe, that the hybrid approach provides a promising path to realize quantum photonic applications, such as quantum networks or quantum repeaters, in the near future.
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