Integration of Diamond-Based Quantum Emitters with Nanophotonic Circuits

Abstract

Nanophotonics provides a promising approach to advance quantum technology by replicating fundamental building blocks of nanoscale quantum optic systems in large numbers with high reproducibility on monolithic chips. While photonic integrated circuit components and single-photon detectors offer attractive performance on silicon chips, the large-scale integration of individually accessible quantum emitters has remained a challenge. Here, we demonstrate simultaneous optical access to several integrated solid-state spin systems with Purcell-enhanced coupling of single photons with high modal purity from lithographically positioned nitrogen vacancy centers into photonic integrated circuits. Photonic crystal cavities embedded in networks of tantalum pentoxide-on-insulator waveguides provide efficient interfaces to quantum emitters that allow us to optically detect magnetic resonances (ODMR) as desired in quantum sensing. Nanophotonic networks that provide configurable optical interfaces to nanoscale quantum emitters via many independent channels will allow for novel functionality in photonic quantum information processors and quantum sensing schemes.

2022 Roadmap on integrated quantum photonics

“…While the generation of photonic quantum states has remained a challenge as yet, the attractive nonlinear properties of Ta 2 O 5 offer exciting prospects for producing quantum optical frequency combs [68]. On the other hand, the low intrinsic photoluminescence and optical transparency at visible wavelengths also allows for integrating a wide range of solid-state quantum emitters, such as color centers in diamond [69], with Ta 2 O 5 nanophotonic circuits (see figure 11(a)), which had remained elusive for SiN. Moreover, SNSPD seamlessly integrate with Ta 2 O 5 waveguides (see figure 11(b)) and provide an efficient, low-noise photon counting solution with excellent timing properties [70].…”

Single Photon Emitters Coupled to Plasmonic Waveguides: A Review

“…High index dielectric material have been utilized for fabrication of waveguides and cavities to change the environment of single photon emitters, and obtain enhanced emission properties. [13][14][15] However, due to the diffraction limit in dielectric structures, the enhancements in decay-rate are also limited. Plasmonic waveguides and cavities offer a bigger advantage in terms of decay-rate enhancements.…”

Swing-up of quantum emitter population using detuned pulses

“…Deterministically preparing the excited state of a quantum emitter is a key to many applications in quantum information technology, since the subsequent decay of the excited state yields a single-photon [1][2][3]. Prominent examples for quantum emitters are semiconductor quantum dots [4][5][6][7][8][9][10], strain potentials and defects in monolayers of atomically thin semiconductors [11][12][13], defect centers in diamond [14][15][16][17][18] or in hexagonal boron nitride [19][20][21]. The deterministic preparation relies on the direct excitation of the quantum emitter excited state by an external laser pulse.…”