Efficient, indistinguishable telecom C-band photons using a tapered nanobeam

• URL: http://arxiv.org/abs/2404.01562v2
• Date: Fri, 5 Apr 2024 17:00:26 GMT
• Title: Efficient, indistinguishable telecom C-band photons using a tapered nanobeam
• Authors: Mohammad Habibur Rahaman, Samuel Harper, Chang-Min Lee, Kyu-Young Kim, Mustafa Atabey Buyukkaya, Victor J. Patel, Samuel D. Hawkins, Je-Hyung Kim, Sadhvikas Addamane, Edo Waks,
• Abstract summary: We demonstrate an efficient fiber-coupled single photon source at the telecom C-band using InAs/InP quantum dots coupled to a tapered nanobeam. This work represents an important step towards the development of telecom C-band single-photon sources emitting bright, pure, and indistinguishable photons.
• Score: 0.2251041561479694
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Telecom C-band single photons exhibit the lowest attenuation in optical fibers, enabling long-haul quantum-secured communication. However, efficient coupling with optical fibers is crucial for these single photons to be effective carriers in long-distance transmission. In this work, we demonstrate an efficient fiber-coupled single photon source at the telecom C-band using InAs/InP quantum dots coupled to a tapered nanobeam. The tapered nanobeam structure facilitates directional emission that is mode-matched to a lensed fiber, resulting in a collection efficiency of up to 65% from the nanobeam to a single-mode fiber. Using this approach, we demonstrate single photon count rates of 575 $\pm$ 5 Kcps and a single photon purity of $g^2$ (0) = 0.015 $\pm$ 0.003. Additionally, we demonstrate Hong-Ou Mandel interference from the emitted photons with a visibility of 0.84 $\pm$ 0.06. From these measurements, we determine a photon coherence time of 450 $\pm$ 20 ps, a factor of just 8.3 away from the lifetime limit. This work represents an important step towards the development of telecom C-band single-photon sources emitting bright, pure, and indistinguishable photons, which are necessary to realize fiber-based long-distance quantum networks

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