Telecom C-band single-photon sources with a semiconductor-dielectric microresonator

• URL: http://arxiv.org/abs/2604.06869v1
• Date: Wed, 08 Apr 2026 09:31:15 GMT
• Title: Telecom C-band single-photon sources with a semiconductor-dielectric microresonator
• Abstract summary: Secure communications with quantum key distribution over fiber-optic links is one of the few recognized applications of quantum physics.<n>Currently, the widely used sources of such photons are highly attenuated laser pulses, featured by a low probability of single photon occurrence.<n>Here, we present an efficient source with an InAs/GaAs quantum dot on a metamorphic buffer layer inside a micro-shaped microcavity.
• Score: 24.636594113704472
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Secure communications with quantum key distribution over fiber-optic links is one of the few recognized applications of quantum physics at the level of individual quanta -- single C-band photons. Currently, the widely used sources of such photons are highly attenuated laser pulses, featured by a low probability of single photon occurrence. Here, we present an efficient source with an InAs/GaAs quantum dot on a metamorphic buffer layer inside a micropillar-shaped microcavity. The key innovation is the use of different semiconductor and dielectric materials to form the lower (GaAs/AlGaAs) and upper (Si/SiO$_2$) Bragg reflectors. Compatibility of these materials in a monolithic source is achieved by depositing a small amount of Si/SiO$_2$ pairs on an incomplete micropillar made from a coherent heterostructure grown by molecular beam epitaxy. This design enables resonant excitation with $π$-pulses and generation of polarized photons with a record-breaking end-to-end efficiency of 11%.

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