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Figure 5 | EPJ Quantum Technology

Figure 5

From: Enhanced Hanbury Brown and Twiss interferometry using parametric amplification

Figure 5

Ratios of SNR of the improved HBT interferometer scheme SNR2 to SNR of the conventional HBT interferometer scheme SNR1 as a function of mean number of photons 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 all the lines are indistinguishably aligned

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