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Sources that can produce single photons in the telecom band, capable of traveling long distances over optical fibers, are of great interest for long-haul quantum communications. In recent years, there has been a major drive to demonstrate single-photon sources (SPSs) for quantum key distribution to provide secure communications over long distances. Nanowires containing a single quantum dot emitting around 1μm have been proven to be viable source to emit a very pure photon with multiphoton probability below 1% [1]. Extending the emission wavelength to the telecom window seemed inevitable to fully exploit the available architecture of long-haul fiber-based quantum optical networks. In this invited talk, we will report on our recent results on the fabrication of InAsP single quantum dot embedded within an InP photonic waveguide nanowire for single photon emission at telecom band. In particular, we outline the importance of the photonic waveguide design for optimum photons generation and coupling to the external optics. Manipulating the dot growth conditions as well as engineering the band structure around the dot (dot-in-a-rod configuration) are some of the approaches [2, 3] that have been applied to achieve emission at 1310nm and will be presented. SPS operating at 1310nm with multiple photon probability below 2% is achieved 4K. [1] D. Dalacu, K. Mnaymneh, J. Lapointe, X. Wu, P. J. Poole, G. Bulgarini, V. Zwiller and M. Reimer, Nano Letters 12, 5919 (2012). [2] S. Haffouz, K. D. Zeuner, D. Dalacu, P. J. Poole, J. Lapointe, D. Poitras, K. Mnaymneh, X. Wu, M. Couillard, M. Korkusinski, E. Schöll, K. D. Jöns, V. Zwiller, and R. L. Williams. Nano Letters 18, 3047 (2018). [3] S. Haffouz, P. J. Poole, J. Jin, X. Wu, K. Mnaymneh, D. Dalacu, and R. L. Williams., Appl. Phys. Lett. 117, 113102 (2020).
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