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The paper shows a single semiconductor quantum dot in a cavity producing non-classical light states whose Wigner negativity can be tuned by adjusting excitation power, with reported fidelities and purities above 95% after loss correction. For quantum computing readers, the relevance is the deterministic route to Wigner-negative resources for continuous-variable optical quantum computing, using mature semiconductor platforms rather than probabilistic frequency conversion. The results are a proof-of-principle on a single emitter, so scalability and loss budgets in full systems remain open questions.
Generation of quantum light with tunable Wigner negativity with a semiconductor quantum dot
arXiv:2610.36233v1 Announce Type: new 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.
Authors:Hubert Lam, Petr Steindl, Yann Portella, Kiarn T. Laverick, Kian Hwee Lim, Juan R. Alvarez, Aristide Lemaitre, Maria Maffei, Alexia Auffeves, Dario A. Fioretto, Pascale Senellart
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.
Quantum Physics (quant-ph); Mesoscale and Nanoscale Physics (cond-mat.mes-hall); Optics (physics.optics)
arXiv:2610.36233 [quant-ph]
(or arXiv:2610.36233v1 [quant-ph] for this version)
https://doi.org/10.48550/arXiv.2610.36233 arXiv-issued DOI via DataCite (pending registration)
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