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Figure 6 | EPJ Quantum Technology

Figure 6

From: One-dimensional waveguide coupled to multiple qubits: photon-photon correlations

Figure 6

The initial second-order correlation, g 2 (0)(on a logarithmic scale), calculated with a weak incident coherent state as a function of the frequency ω near the qubit resonant frequency ( ω 0 =100Γ) for different numbers of qubits. The first (second) row is for k 0 L=π/2 (π/4); the first (second) column is for transmitted (reflected) photons. The black, dashed line indicates the classical value (i.e., g 2 =1). For reflected photons with N=1, g 2 (0)=0 for all ω and hence is not plotted. Note that as for the single-photon transmission in Fig. 2, g 2 (0) is symmetric about ω 0 for k 0 L=π/2 but asymmetric in the k 0 L=π/4 case. For a wide range of parameters, both transmitted and reflected photons are bunched.

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