Abstract
We propose an on-demand single-photon source for quantum cryptography using ametal–insulator–semiconductor quantum dot capacitor structure. The main component inthe semiconductor is a p-doped quantum well, and the cylindrical gate under considerationis only nanometres in diameter. As in conventional metal–insulator–semiconductorcapacitors, our system can also be biased into the inversion regime. However, due to thesmall gate area, at the onset of inversion there are only a few electrons residing in aquantum dot. In addition, because of the strong size quantization and large Coulombenergy, the number of electrons can be precisely controlled by the gate voltage. Afterholding just one electron in the inversion layer, the capacitor is quickly biased back to theflat-band condition, and the subsequent radiative recombination across the bandgapresults in single-photon emission. We present numerical simulation results of asemiconductor heterojunction and discuss the merits of this single-photon source.
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