Figure 4

Ratios of signal of the improved HBT interferometer scheme to signal of the conventional HBT interferometer scheme as a function of mean number of photons n̄ in light rays k⃗ and \(\vec{k}^{\prime }\) when \(g = 2\). The red line corresponds to the new scheme without noise. The orange dotted line and the purple dotted line correspond to the new schemes with photon loss \(\text{L}=0.5\) and photon loss \(\text{L}=0.1\), respectively. The blue dotted line and the green dotted line correspond respectively to the new schemes with beam splitter transmissivity \(\text{T}=50\% \) and \(\text{T}=90\% \) when the photon number of thermal noise is \(\text{N}=0.1\). Note that the orange line and the blue line are overlapped, and the purple and green are, too