Abstract
Quantum light plays a pivotal role in modern science and future photonic applications. Since the advent of integrated quantum nanophotonics different material platforms based on III–V nanostructures-, colour centers-, and nonlinear waveguides as on-chip light sources have been investigated. Each platform has unique advantages and limitations; however, all implementations face major challenges with filtering of individual quantum states, scalable integration, deterministic multiplexing of selected quantum emitters, and on-chip excitation suppression. Here we overcome all of these challenges with a hybrid and scalable approach, where single III–V quantum emitters are positioned and deterministically integrated in a complementary metal–oxide–semiconductor-compatible photonic circuit. We demonstrate reconfigurable on-chip single-photon filtering and wavelength division multiplexing with a foot print one million times smaller than similar table-top approaches, while offering excitation suppression of more than 95 dB and efficient routing of single photons over a bandwidth of 40 nm. Our work marks an important step to harvest quantum optical technologies’ full potential.
Highlights
Quantum light plays a pivotal role in modern science and future photonic applications
The quantum emitter consists of an InAsP quantum dot (QD) embedded in a pure wurtzite InP nanowire
After pre-characterizing the nanowire QDs on the growth chip, we select emitters based on their emission wavelength, brightness, and line width, and transfer them to the desired location using a custom-built nanomanipulation tool[7]
Summary
Quantum light plays a pivotal role in modern science and future photonic applications. The type of application determines which photonic platform is used, but there are some universal requirements in a quantum photonic circuit regardless These requirements are as follows: deterministic integration of multiple on-demand selected single-photon sources[7, 8]; demonstration of complex photonic circuits for qubit manipulation[9,10,11]; and on-chip detection[6]. There are challenges to realize III–V quantum photonic circuits[22,23,24] These challenges include deterministic integration of selected QDs into optical waveguides/cavities, efficient filtering of specific quantum transitions within the emission spectrum, on-chip pump suppression, and multiplexing of multiple QDs. In our work, we overcome all of the discussed challenges by realizing hybrid integrated quantum photonic circuits. We present an in-plane pumping scheme and realize a multi-quantum emitter circuit with independently selected and deterministically integrated quantum emitters
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