主講 人：Dr. Erik Stock（Technical University Berlin）
演講主題：Electrically Driven Single Photon Sources Based on Single Quantum Dot RCLEDs
演講時間：100年03月02日（三）上午10時
演講地點：中央大學物理系625室（S4-625）
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Abstract:
Self-organized quantum dots (QDs) demonstrated recently their excellent capability for compact electrically driven single and entangled photon sources [1]. Electrical pumping of single QDs embedded in pin-diode structures poses two main challenges: The first is the control of the current path in a way that only one QD is pumped, and the second is to assure that the QD is equally filled by electrons and holes to achieve emission from uncharged excitons. Thus the uncharged biexciton-exciton decay cascade can be used for the creation of entangled photon pairs (provided the fine-structure splitting (FSS) is small enough) or single polarized photons (for large FSS), prerequisite for the BB84 protocol.
We realized a highly efficient single photon source (SPS) based on on a single electrically driven InGaAs/GaAs QD. Our resonant cavity light emitting diode (RLED) generates single polarized photons at a repetition rate of 1 GHz exhibiting a second order correlation function g(2)(0) = 0. The operating temperature can be increased up to 80 K still preserving non-classical light emission.
To study the photon characteristic of the RCLED we used superconducting single photon detectors (SSPD). Photon cross correlation measurements on the exciton (X) and biexciton (XX) luminescence emission results in a time delay of less than 70 ps.
A promising candidate for the generation of entangled photons are QD grown on (111) GaAs substrate. Mikro-photoluminescence spectroscopy on single QDs demonstrates a fine structure splitting < 10
演講主題：Electrically Driven Single Photon Sources Based on Single Quantum Dot RCLEDs
演講時間：100年03月02日（三）上午10時
演講地點：中央大學物理系625室（S4-625）
-------------------------------------------------------------------------------------------------------
Abstract:
Self-organized quantum dots (QDs) demonstrated recently their excellent capability for compact electrically driven single and entangled photon sources [1]. Electrical pumping of single QDs embedded in pin-diode structures poses two main challenges: The first is the control of the current path in a way that only one QD is pumped, and the second is to assure that the QD is equally filled by electrons and holes to achieve emission from uncharged excitons. Thus the uncharged biexciton-exciton decay cascade can be used for the creation of entangled photon pairs (provided the fine-structure splitting (FSS) is small enough) or single polarized photons (for large FSS), prerequisite for the BB84 protocol.
We realized a highly efficient single photon source (SPS) based on on a single electrically driven InGaAs/GaAs QD. Our resonant cavity light emitting diode (RLED) generates single polarized photons at a repetition rate of 1 GHz exhibiting a second order correlation function g(2)(0) = 0. The operating temperature can be increased up to 80 K still preserving non-classical light emission.
To study the photon characteristic of the RCLED we used superconducting single photon detectors (SSPD). Photon cross correlation measurements on the exciton (X) and biexciton (XX) luminescence emission results in a time delay of less than 70 ps.
A promising candidate for the generation of entangled photons are QD grown on (111) GaAs substrate. Mikro-photoluminescence spectroscopy on single QDs demonstrates a fine structure splitting < 10