Microfiber-microcavity system for efficient single photon collection

Abstract

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

Modular system for fluorescence-based single photon generation using a retro-reflector

“…This value of g (2) (0) implies that noise photons are inherently present in PL by a 13 % chance. 16,17 With the maximum excitation power of 3.8P sat , the count rate reached to total 3 × 10 5 photons per second maximally and g (2) (0) was increased to 0.4 ± 0.03. But this value remains in the regime that the single photon emission still dominates the chance to be trapped into metastable state and an emission of noise photons.…”

Efficient Single-Photon Coupling from a Nitrogen-Vacancy Center Embedded in a Diamond Nanowire Utilizing an Optical Nanofiber

“…To overcome this limitation, varieties of hybrid systems that contain structured emitters with nanofibers were discussed, including a semiconductor membrane 40 , 41 , a buried semiconductor waveguide 42 , 43 , and a linear photonic crystal cavity 44 . In these structured emitters, the emission from the NV is well coupled to one of the supported electromagnetic modes regardless of its orientation.…”

“…At first glance, this means that the radiation losses induced by the butt coupling to the emitter structure (transition losses from the nanofiber to the hybrid system) may seriously impede the maximum coupling efficiency that can be achieved. Although dimples were typically introduced to nanofibers in order to avoid this type of losses, experimental uncertainties may also be increased 40 – 44 . In this regard, use of an adiabatically tapered diamond waveguide is promising 45 – 48 and experimental realization of such a system was reported very recently 47 .…”

A fiber-integrated nanobeam single photon source emitting at telecom wavelengths

“…Several previous works have reported fiber-coupled single photon sources using either semiconductor quantum dots [20][21][22][23][24][25][26][27][28] or nitrogen-vacancy centers in diamond [29][30][31][32][33] .…”