Generation of quantum light with tunable Wigner negativity with a semiconductor quantum dot
Abstract
Wigner-negative states of light are key resources for quantum advantage in continuous-variable optical quantum computing. They can be produced probabilistically via frequency conversion and photon detection, or deterministically by exploiting the single-photon nonlinearity of a quantum emitter. Here, we generate such Wigner-negative states of light with a tunable negativity using a single semiconductor quantum dot in a cavity. Optical coherent control of the quantum-dot transition allows to generate a quantum superposition of zero and one photon. The generated quantum states are characterized point-by-point in the phase space through homodyne measurement. The emergence of Wigner-function negativity is observed as the excitation power is increased. After correcting for collection and propagation losses, we obtain fidelities to the ideal state and quantum purities above 95%, together with near-optimal quadrature squeezing. The ability to generate a wide variety of Wigner-negative states with mature semiconductor technology opens promising opportunities for continuous-variable optical quantum technologies.
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BibTeX
@misc{lam2026generation,
title = {{Generation of quantum light with tunable Wigner negativity with a semiconductor quantum dot}},
author = {Hubert Lam and Petr Steindl and Yann Portella and Kiarn T. Laverick and Kian Hwee Lim and Juan R. Alvarez and Aristide Lemaitre and Maria Maffei and Alexia Auffeves and Dario A. Fioretto and Pascale Senellart},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.36233},
eprint = {2610.36233},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.36233},
}
RIS
TY - UNPB
TI - Generation of quantum light with tunable Wigner negativity with a semiconductor quantum dot
AU - Hubert Lam
AU - Petr Steindl
AU - Yann Portella
AU - Kiarn T. Laverick
AU - Kian Hwee Lim
AU - Juan R. Alvarez
AU - Aristide Lemaitre
AU - Maria Maffei
AU - Alexia Auffeves
AU - Dario A. Fioretto
AU - Pascale Senellart
PY - 2026
DA - 2026/10/26
PB - arXiv
DO - 10.48550/arxiv.2610.36233
UR - https://arxiv.org/abs/2610.36233
AB - Wigner-negative states of light are key resources for quantum advantage in continuous-variable optical quantum computing. They can be produced probabilistically via frequency conversion and photon detection, or deterministically by exploiting the single-photon nonlinearity of a quantum emitter. Here, we generate such Wigner-negative states of light with a tunable negativity using a single semiconductor quantum dot in a cavity. Optical coherent control of the quantum-dot transition allows to generate a quantum superposition of zero and one photon. The generated quantum states are characterized point-by-point in the phase space through homodyne measurement. The emergence of Wigner-function negativity is observed as the excitation power is increased. After correcting for collection and propagation losses, we obtain fidelities to the ideal state and quantum purities above 95%, together with near-optimal quadrature squeezing. The ability to generate a wide variety of Wigner-negative states with mature semiconductor technology opens promising opportunities for continuous-variable optical quantum technologies.
ER -