Microfiber microcavity system for efficient single photon
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(0) 0.46. Resonant pump is expected to improve the rather high g(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. (c) 2016 Optical Society of America OCIS codes: (230.5590) Quantum well, wire and dot devices; (230.5298) Photonic crystals; (270.0270) Quantum Optics; References and links 1. N. Gisin, G. G. Ribordy, W. Tittel, and H. Zbinden, "Quantum cryptography," Rev. Mod. Phys. 74, 145 195 (2002) 2. E. Knill, R. Laflamme, and G. J. Milburn, "A scheme for efficient quantum computation with linear optics," Nature 409, 46 52 (2001) 3. S. Buckley, K. Rivoire, and J. Vuckovic, "Engineered quantum dot single photon sources," Rep. Prog. Phys. 75, 126503 (2012) 4. M. Pelton, C. Santori, J. Vuckovic, B. Zhang, G. Solomon, J. Plant, and Y. Yamamoto, "Efficient Source of Single Photons: A Single Quantum Dot in a Micropost Microcavity," Phys. Rev. Lett. 89, 233602 (2002) 5. C. Santori, D. Fattal, J. Vuckovic, G. S. Solomon, and Y. 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