A scheme for two-photon lasing with two coupled flux qubits in circuit quantum electrodynamics<xref ref-type="fn" rid="cpb142316fn1">*</xref>

A scheme for two-photon lasing with two coupled flux qubits in circuit quantum electrodynamics*

Huang Wen^a),^b), Zou Xu-Bo^a),^b)†, Guo Guang-Can^a),^b)

Photon statistics properties of the resonator: (a) Average photon number 〈 n 〉, (b) Fano factor F , and (c) g ⁽²⁾(0) as a function of the two-photon detuning δ . The parameters are the same as in Fig. 4 except for a fixed pumping rate p = 0.5 g and for different values of the qubit dissipative rate: γ = 0.05 g (green dashed lines), γ = 0.1 g (dark dot–dashed lines), γ = 0.2 g (red dotted lines), γ = 0.3 g (blue solid lines). The horizontal dashed line in panel (c) indicates the value g ⁽²⁾(0) = 2 (thermal distribution).