InAs quantum dots grown on metamorphic buffers as non-classical light sources at telecom C-band: a review

摘要: Long-distance quantum communication and computation is based on the exchange of information via photons as flying qubits. In all foreseen implementations, from relays networks to remote computing, must be able propagate over long distances, in silica fibers, with limited absorption wave packet dispersion. When propagating into so-called telecom C-band (i.e. wavelength around 1550 nm) will experience absolute minimum absorption, together a photon This implies that losses minimized additionally, capability interfere (the Hong–Ou–Mandel effect) negligibly affected. motivated search for efficient non-classical light sources this range. present review, we discuss approaches followed red-shift emission near-infrared (NIR) wavelengths. particular, use metamorphic buffers (MMBs) enabled highly developed InAs/GaAs systems, engineering dots emit single entangled C-band. The main advantage approach set by choice material system: being same state-of-the-art structures emitting NIR range, it opens possibility achieving comparable performances even at telecommunication Here current generation photons, comparing properties MMB-based results other competing dot (QD) platforms. We report particular very low fine-structure splitting can observed conservative values, average well below 10 μeV. allowed observation post-selected entanglement fidelity higher than 0.6. Additionally, on-demand single-photon was addition emitter density decay time τ ≈ 1.2 ns standard InAs QDs A final highlight further improve device also reported.