CUED Publications database

Biexciton cascade in telecommunication wavelength quantum dots

Ward, MB and Intallura, PM and Natarajan, CM and Hadfield, RH and Atkinson, P and Yuan, ZL and Miki, S and Fujiwara, M and Sasaki, M and Wang, Z and Baek, B and Nam, SW and Ritchie, DA and Shields, AJ (2010) Biexciton cascade in telecommunication wavelength quantum dots. Journal of Physics: Conference Series, 210. ISSN 1742-6588

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We report on polarisation correlation from the cascaded recombination of biexcitons in a quantum dot emitting at a telecommunication wavelength. The fine structure splitting of the exciton state in this InAs/GaAs quantum dot is of the order of 100 μeV and polarisation correlation is expected. Strong polarisation correlation between the biexciton and exciton emission lines is observed under both continuous wave (CW) and pulsed laser excitation so telecom wavelength quantum dots with lower energy splittings could be suitable for entangled photon pair generation. Measurements were performed using nanowire superconducting single photon detectors (SSPDs). SSPDs offer low time-jitter and improve the resolution of features in the correlation spectra, including the asymmetric dip and peak resulting from the cascaded emission with the peak extending more than an order of magnitude above the Poissonian level. © 2010 IOP Publishing Ltd.

Item Type: Article
Divisions: Div B > Photonics
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:31
Last Modified: 08 Apr 2021 06:32
DOI: 10.1088/1742-6596/210/1/012036