Generation of quantum light with tunable Wigner negativity with a semiconductor quantum dot
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Hubert Lam, Petr Steindl, Yann Portella, Kiarn T. Laverick, Kian Hwee Lim, Juan R. Alvarez et al. · arXiv: 2610.36233v1 · Summary page
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A semiconductor emitter shapes nonclassical light
A quantum dot inside an optical cavity has produced light with tunable Wigner negativity, a signature that its quantum state cannot be described as an ordinary statistical mixture of classical light fields. Coherent optical control of the emitter created superpositions of vacuum and a single photon. Homodyne measurements mapped the resulting states in phase space, revealing negativity as the excitation power increased.
After correction for collection and propagation losses, the researchers report state fidelities and quantum purities above 95%, alongside near-optimal quadrature squeezing. Such controllable light states are resources for continuous-variable optical quantum computing. The semiconductor platform is attractive technologically, but the distinction between loss-corrected state quality and the light actually delivered to a user remains important.
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