Quantum key
distribution using quantum dot single-photon emitting diodes in the red and
near infrared spectral range
Abstract
We report
on in-lab free space quantum key distribution (QKD) experiments over 40 cm
distance using highly efficient electrically driven quantum dot single-photon
sources emitting in the red as well as near-infrared spectral range. In the case
of infrared emitting devices, we achieve sifted key rates of 27.2 kbit s−1
(35.4 kbit s−1) at a quantum bit error rate (QBER) of 3.9% (3.8%) and a g(2)(0)
value of 0.35 (0.49) at moderate (high) excitation. The red emitting diodes
generate sifted keys at a rate of 95.0 kbit s−1 at a QBER of 4.1% and a g(2)(0)
value of 0.49. This first successful proof of principle QKD experiment based on
electrically operated semiconductor single-photon sources can be considered as
a major step toward practical and efficient quantum cryptography scenarios.
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