The generation of quantum light from the solid state has made a big step forward with the demonstration by Kai Müller, Armand Rundquist and Kevin Fischer from the Vučković group in Stanford, of record-value antibunching, along with other types of photon correlations.

They used the semiconductor counterpart of Haroche's Nobel winning cavity QED laboratory, namely, a quantum dot in a photonic crystal, and implemented one idea we proposed with Jonathan Finley back in 2012 in the Walter Schottky Institute, along with our master student Michael Schrapp and friend Arne Laucht: detune the emitter from the cavity.

Why so?

Kai et al. have demonstrated that this is true, experimentally, and more than tripled the quality of antibunching (from $g^{(2)}\approx0.9$ to $\approx 0.29$). Calculations show that with better samples, already available, this figure will go down as close to zero as $0.1$. This is still for semiconductors. In circuit QED, antibunching would be measured in several negative powers of ten.

Solid state cavity QED