Abstract:Single photon sources are key components for various quantum information processings. For practical quantum applications, bright single photon sources with efficient fiber-optical interfaces are highly required. Here, bright fiber-coupled single photon sources based on InAs quantum dots are demonstrated through the k-vector matching between a microfiber mode and a normal mode of the linear photonic crystal cavity. One of the modes of the linear photonic crystal cavity whose k-vector is similar to that of the microfiber mode is employed. From independent transmission measurement, the coupling efficiency directly into the fiber of 58% is obtained. When the quantum dot and cavity system is non-resonantly pumped with 80 MHz pulse train, a raw count rate of 1.81 MHz is obtained with g (2) (0) = 0.46. Resonant pump is expected to improve the rather high g (2) (0) value. Time-resolved photoluminescence is also measured to confirm the three-fold Purcell enhancement. This system provides a promising route for efficient direct fiber collections of single photons for quantum information processing. R. Nagai and T. Aoki, "Ultra-low-loss tapered optical fibers with minimal lengths," Opt. Express 22, 28427-28436 (2014

From Random to Deterministic Coupling In article number 2210667, Minho Choi, Jin Dong Song, Young‐Ho Ko, Yong‐Hoon Cho, and co‐workers use a non‐destructive nanoscale focus pin‐spot method to select an array of single quantum dots from randomly distributed ensembles. Since the selected quantum dots are located at predetermined positions, they can be deterministically coupled with photonic structures and exhibit high collection efficiency.

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The heterogeneous integrated quantum dot with piezoelectric material was fabricated for wavelength tunable quantum emitters. The integrated structure effectively generated local strain with applying voltage, resulting in wavelength tunable single photon emission and adjusting fine-structure splitting for entangle photon pair generation.