Two-photon interference from remote quantum dots with inhomogeneously broadened linewidths

P. Gold*, A. Thoma, S. Maier, S. Reitzenstein, C. Schneider, S. Hoefling, M. Kamp

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

In this paper, we study the influence of quasiresonant and nonresonant excitation on the interference properties of single photons emitted from quantum dots (QDs). The quasiresonant excitation scheme leads to an increase of interference visibility of photons emitted from the same QD to 69% compared to 12% for nonresonant excitation. Furthermore, we demonstrate quantum interference of photons emitted from separate QDs which are simultaneously excited into their p shell. We can readily extract a two-photon interference visibility as high as (39 ± 2)% for nonpostselected coincidences exceeding the predicted value based on coherence and radiative decay times of the quantum dot emission (similar to 25%). We account for this observation by treating the emission of both quantum dots as inhomogeneously broadened ensembles of Fourier-limited photons and observe good congruence between experiment and model.

Original languageEnglish
Article number035313
Number of pages7
JournalPhysical Review. B, Condensed matter and materials physics
Volume89
Issue number3
DOIs
Publication statusPublished - 27 Jan 2014

Keywords

  • Single-photon source
  • Device
  • Indistinguishability
  • Teleportation
  • Entanglement
  • Emission

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