Trion quantum coherence in site-controlled pyramidal InGaAs quantum dots

Barcan, Rares and Samaras, Ioannis and Barr, Kristopher and Lagoudakis, Konstantinos G. (2026) Trion quantum coherence in site-controlled pyramidal InGaAs quantum dots. Scientific Reports, 16 (1). 4114. ISSN 2045-2322 (https://doi.org/10.1038/s41598-025-33282-2)

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Abstract

Deterministically positioned pyramidal InGaAs quantum dots (QDs) exhibit exceptional quantum properties, making them highly promising candidates for scalable on-chip quantum information processing. In this work, we investigate the coherent dynamics of positively charged excitons under the influence of strong magnetic fields in the Faraday configuration. Pyramidal quantum dots exhibit a fourfold splitting of the charged excitons even in the Faraday configuration, giving rise to an optically addressable double-Lambda () system akin to self-assembled quantum dots in oblique magnetic fields. Here, we investigate ultrafast complete coherent control of the trion to ground state transition utilizing advanced optical resonant excitation techniques and we observe quantum coherence over timescales that are similar to other prominent quantum dot platforms. These results pave the way towards establishing site-controlled pyramidal InGaAs QDs as scalable platforms for quantum information processing, expanding the reach of coherent control to new quantum systems.

ORCID iDs

Barr, Kristopher ORCID: https://orcid.org/0000-0001-6141-4424

Lagoudakis, Konstantinos G. ORCID: https://orcid.org/0000-0002-4410-4755

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• Item metadata

  Item type:	Article
  ID code:	95376
  Dates:	Date Event 30 January 2026 Published 22 January 2026 Published Online 1 December 2025 Accepted
  Subjects:	Science > Physics
  Department:	Faculty of Science > Physics
  Depositing user:	Pure Administrator
  Date deposited:	22 Jan 2026 10:52
  Last modified:	25 Feb 2026 09:30
  Related URLs:	https://arxiv.org/abs/2506.20339
  URI:	https://strathprints.strath.ac.uk/id/eprint/95376