Mode-Matched Resonant Excitation of a Nanowire Quantum Dot in a Nanophotonic Waveguide
Sayan Gangopadhyay, Lingxi Yu, Tarun Patel, Matteo Pennacchietti, David B. Northeast, Robin L. Williams, Philip J. Poole, Michael E. Reimer, Dan Dalacu
TL;DR
Researchers developed a method to coherently excite nanowire quantum dots using a nanophotonic waveguide, improving single-photon emission for quantum technologies.
Contribution
A reliable technique for resonant excitation of quantum dots using mode-matching and polarization-rejection in a nanowire waveguide.
Findings
Low multiphoton emission was achieved with g^(2)(0) = 0.019.
Multiple Rabi oscillations were observed under pulsed resonant excitation.
Two-photon indistinguishability reached 41% interference visibility.
Abstract
Nanowire-based quantum dots as sources of single photons are promising candidates for the implementation of quantum photonic technologies. Achieving coherent control of these sources is essential for generating indistinguishable single photonsa key requirement for quantum interference. However, coherent excitation of nanowire quantum dots via resonant pumping has remained a long-standing challenge due to high laser suppression requirements. Here we establish a reliable technique to implement resonant excitation of a quantum dot in a tapered single-mode nanowire waveguide by complementing polarization–rejection with mode-matching to minimize the amount of backscattered laser. We demonstrate low multiphoton emission [g X (2)(0) = 0.019] and multiple Rabi oscillations under pulsed resonant excitation. We also report on two-photon indistinguishability under resonant excitation, achieving…
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Taxonomy
TopicsPhotonic Crystals and Applications · Semiconductor Quantum Structures and Devices · Near-Field Optical Microscopy