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  • 2015 European Conference on Lasers and Electro-Optics - European Quantum Electronics Conference
  • (Optica Publishing Group, 2015),
  • paper EB_3_4

On-Demand Single Photon Emission Based on Dynamic Photon Storage on a Photonic Integrated Circuit

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Abstract

On-demand single photon sources constitute an essential element in quantum information technology. There has been a strong focus on integrating nonclassical light sources with optical gates and detectors in photonic integrated circuits (PICs). Recently, large scale integration of single-photon detectors has been demonstrated [1] as well as room-temperature entangled photon pair sources based on spontaneous four-wave mixing (FWM) [2,3]. Here, we provide an analysis of using a combination of heralding and dynamic photon storage [4] to achieve on-demand single photon emission on CMOS-compatible PICs, which is an important distinction from existing proposals based on bulk optics [5]. In Fig. 1 we show a schematic of our source design. Signal and idler photons are generated by degenerate FWM in the storage ring. Three other rings are used to couple the frequencies ωp, ωi, and ωs in and out of the storage ring individually. One photon emission cycle consists of the following steps: 1) The idler photon of the signal-idler pair generated by a high intensity CW pump field is coupled into the detector via the idler ring, which is resonant with ωi (red spectrum). 2) The click on the detector triggers a switch to stop the pump laser from entering the pump ring. The pump field remaining in the storage ring is coupled out via the pump ring to minimize the probability of generating additional photon pairs. 3) The signal photon is kept in the storage ring until a clock-signal arrives at the signal ring causing it to temporarily tune into resonance with ωs (dashed blue spectrum) to release the signal photon, after which it returns to its uncoupled state (solid blue spectrum). The clock-signal also arrives at the switch and returns it to its open state, which completes the cycle.

© 2015 IEEE

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