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

• URL: http://arxiv.org/abs/2510.21428v1
• Date: Fri, 24 Oct 2025 13:06:46 GMT
• Title: Exciton and biexciton preparation via coherent swing-up excitation in a GaAs quantum dot embedded in micropillar cavity
• Authors: Claudia Piccinini, Aleksander Rodek, Abdulmalik A. Madigawa, Ailton Garcia Jr., Saimon F. Covre da Silva, Vikas Remesh, Luca Vannucci, Gregor Weihs, Armando Rastelli, Niels Gregersen, Battulga Munkhbat,
• Abstract summary: Recently proposed swing-up of quantum emitter (SUPER) scheme enables coherent preparation of excitons via off-resonant, red-detuned laser pulses.<n>Super results in a highly polarized single-photon emission exceeding resonant TPE saturation by a factor of 1.45.<n>These findings establish the SUPER scheme as a versatile tool for state-selective exciton and biexciton control, with strong potential for quantum photonic applications.
• Score: 29.072229245538605
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Coherent control of quantum emitters is essential for scalable quantum photonic technologies. The recently proposed swing-up of quantum emitter (SUPER) scheme enables the coherent preparation of excitons via off-resonant, red-detuned laser pulses, offering highly efficient single-photon generation. We present a systematic study of SUPER excitation applied to a single GaAs quantum dot in a low-Q micropillar cavity. After identifying optimal excitation conditions, we benchmark the SUPER scheme against above-band, p-shell, and two-photon biexciton excitation (TPE). Despite requiring higher excitation powers, SUPER achieves near-unity population inversion ($\sim$95 %) and high single-photon purity ($g^{(2)}=0.03$), comparable to TPE, while also yielding a shortened exciton decay time ($\sim$200 ps), indicative of direct, efficient exciton preparation. A polarization-resolved analysis reveals that, when both excitation and collection are aligned with the exciton dipole, SUPER results in a highly polarized single-photon emission exceeding resonant TPE saturation by a factor of 1.45. Under optimal excitation conditions, we also observe biexciton preparation via a distinct SUPER resonance, confirmed by unpolarized exciton emission, extended lifetime due to the biexciton-exciton cascade, and biexciton emission, constituting the first experimental demonstrations of biexciton preparation under SUPER. These findings are in good agreement with a proposed four-level theoretical model including the biexciton. We also report that, strikingly, a slight misalignment of laser polarization induces an additional SUPER resonance that selectively populates the orthogonal exciton state without altering the nominal excitation polarization. These 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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