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 κ = 0.08 g , γ = 0.05 g , J = 3.8 (2 π GHz) and p = 0.2 g (blue solid lines), p = 0.5 g (red dotted lines), p = 0.8 g (dark dot–dashed lines), p = 1.2 g (green dashed lines). The horizontal dashed lines in panel (c) indicate the values g ⁽²⁾(0) = 1 (Poisson distribution) and g ⁽²⁾(0) = 2 (thermal distribution).