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)

(a) Average photon number, (b) Fano factor F , and (c) g ⁽²⁾(0) as a function of the pumping rate p for δ = 0, γ = 0.05 g , J = 3.8 (2 π GHz), and different values of the resonator decay rate: κ = 0.12 g (blue solid lines), κ = 0.08 g (red dotted lines), κ = 0.05 g (dark dot–dashed lines), and κ = 0.02 g (green dashed lines). The horizontal dashed lines in panels (b) and (c) indicate the value F = 1, g ⁽²⁾(0) = 1 (Poisson distribution), and g ⁽²⁾(0) = 2 (thermal distribution).