Journal article Open Access

Quantum Dots for Single- and Entangled-Photon Emitters

Bimberg, Dieter; Stock, Erik; Lochmann, Anatol; Schliwa, Andrei; Tofflinger, J. A.; Unrau, Waldemar; Munnix, M.; Rodt, Sven; Toropov, Aleksandr I.; Bakarov, Askhat; Haisler, Vladimir A.; Kalagin, Aleksandr K.


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{
  "conceptrecid": "896350", 
  "created": "2017-09-19T12:37:58.008873+00:00", 
  "doi": "10.1109/jphot.2009.2025329", 
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    "creators": [
      {
        "name": "Bimberg, Dieter"
      }, 
      {
        "name": "Stock, Erik"
      }, 
      {
        "name": "Lochmann, Anatol"
      }, 
      {
        "name": "Schliwa, Andrei"
      }, 
      {
        "name": "Tofflinger, J. A."
      }, 
      {
        "name": "Unrau, Waldemar"
      }, 
      {
        "name": "Munnix, M."
      }, 
      {
        "name": "Rodt, Sven"
      }, 
      {
        "name": "Toropov, Aleksandr I."
      }, 
      {
        "name": "Bakarov, Askhat"
      }, 
      {
        "name": "Haisler, Vladimir A."
      }, 
      {
        "name": "Kalagin, Aleksandr K."
      }
    ], 
    "description": "The efficient generation of polarized single or entangled photons is a crucial requirement for the implementation of quantum key distribution (QKD) systems. Self-organized semiconductor quantum dots (QDs) are capable of emitting one polarized photon or an entangled photon pair at a time using appropriate electrical current injection. We realized a highly efficient single-photon source (SPS) based on well-established semiconductor technology: In a pin structure, a single electron and a single hole are funneled into a single InAs QD using a submicron AlOx current aperture. Efficient radiative recombination leads to emission of single polarized photons with an all-time record purity of the spectrum. Non-classicality of the emitted light without using additional spectral filtering is demonstrated. The out-coupling efficiency and the emission rate are increased by embedding the SPS into a micro-cavity. The design of the micro-cavity is based on detailed modeling to optimize its performance. The resulting resonant single-QD diode is driven at a repetition rate of 1 GHz, exhibiting a second-order correlation function of g(2)(0) = 0. Eventually, QDs grown on (111)-oriented substrates are proposed as a source of entangled photon pairs. Intrinsic symmetry-lowering effects leading to the splitting of the exciton bright states are shown to be absent for this substrate orientation. As a result, the XX rarr X rarr 0 recombination cascade of a QD can be used for the generation of entangled photons without further tuning of the fine-structure splitting via QD size and/or shape.", 
    "doi": "10.1109/jphot.2009.2025329", 
    "license": {
      "id": "CC-BY-SA-4.0"
    }, 
    "publication_date": "2009-07-01", 
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    "resource_type": {
      "subtype": "article", 
      "title": "Journal article", 
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    }, 
    "title": "Quantum Dots for Single- and Entangled-Photon Emitters"
  }, 
  "owners": [
    13380
  ], 
  "revision": 2, 
  "updated": "2017-09-19T13:59:43.826115+00:00"
}

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