| With the development of technologies such as quantum networks,quantum communi-cations,and quantum simulation.In a superconducting QED system,the coupling coeffi-cient g between the qubit(artificial atom)and the microwave cavity field can be compared with the cavity field frequency w,even exceeding the cavity frequency.Rotary wave ap-proximation is no longer applicable,and the Rabi model is needed to describe the coupling properties of superconducting qubits and microwave cavity fields.Based on this model,this paper focuses on the non-classical properties of a strongly coupled double-qubit-cavity field system.First,we derive the eigenvalues and eigenstates of a strongly coupled system with dou-ble qubits-cavity field,and obtain the principal equations of the system under weakly driv-en fields with the modified state representation.Secondly,using the principal equation we find that when the driving field resonates with a modified state that contains double qubits,and the modified state containing single qubits does not resonate,the system can produce a phenomenon that is accompanied by non-classical giant radiation.Moreover,the giant radiation effect obtained under strong coupling conditions is better than that under weak coupling conditions.Finally,the phenomenon of multiphoton blocking in cavity quantum electrodynamics(CQED)is discussed.It was found that the associated behavior of the double-qubit-cavity-field coupling system depends on the relative coupling strength of each qubit and cavity field.Under different conditions,the system can exhibit two-photon block-ing and two-photon antibunching,three-photon blocking and three-photon antibunching,and three-photon blocking with two-photon bunching.Compared with the result of weak-ly coupled system with two atoms and one-mode cavity,it is found that the multi-photon blocking effect of the system is better under the condition of strong coupling of double-qubit-single-mode cavity. |
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