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Exciton and biexciton preparation via coherent swing-up excitation in a GaAs quantum dot embedded in a micropillar cavity

Claudia Piccinini1,*, Aleksander Rodek1,*, Abdulmalik A. Madigawa1, Ailton Garcia, Jr.2, Saimon F. Covre da Silva2, Martin A. Jacobsen1, Luca Vannucci1, Gregor Weihs3, Armando Rastelli2 et al.

Vikas Remesh3, Niels Gregersen1,†, and Battulga Munkhbat1,‡

  • *These authors contributed equally to this work.
  • †Contact author: ngre@dtu.dk
  • ‡Contact author: bamunk@dtu.dk
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Phys. Rev. B 114, 105306 – Published 24 August, 2026

DOI: https://doi.org/10.1103/q616-jr19

Abstract

Coherent control of quantum emitters is essential for scalable quantum photonic technologies. The recently proposed swing up of the quantum emitter population (SUPER) scheme allows efficient and coherent state preparation via off-resonant, red-detuned laser pulses, simplifying laser suppression and enhancing photon collection. We present a systematic study of SUPER excitation applied to a single GaAs quantum dot in a low-Q micropillar cavity. We first identify the optimal excitation conditions for SUPER, and then compare the key figures of merit against the well-established two-photon excitation (TPE). Despite requiring higher excitation powers, SUPER achieves near-unity population inversion of the exciton state (∼95%) and high single-photon purity (g(2)=0.03) comparable to that under TPE, while also exhibiting a shortened decay time (∼200 ps) reducing the time jitter in the exciton population. A polarization-resolved analysis reveals that when both excitation and collection are aligned with one of the exciton dipoles, SUPER results in highly polarized single-photon emission, exceeding the resonant TPE saturation by a factor of 1.45. Under optimized excitation conditions, we also observe biexciton preparation via a distinct SUPER resonance, constituting an experimental demonstration of biexciton preparation using SUPER. These findings are in good agreement with a proposed four-level theoretical model that incorporates the biexciton state. Furthermore, we report that, strikingly, a slight misalignment of laser polarization induces an additional SUPER resonance that selectively populates the orthogonal exciton dipole, without altering the nominal excitation polarization. This unexpected behavior reveals a new degree of freedom for coherent state preparation. Our findings establish the SUPER scheme as a versatile tool for state-selective exciton and biexciton control, with strong potential for quantum photonic applications.

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Phys. Rev. B 114, 105306– Published 24 August, 2026
  • Received 5 March 2026
  • Revised 16 June 2026
  • Accepted 8 July 2026
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