Electromagnetic Pulse Control Of Superconducting Circuit

The qubit is the basic unit of quantum computing and quantum communication,and is usually made of superconducting Josephson structure.In practice,microwave pulses are commonly used to control and measure qubits.As the basic element of quantum computing,the realization of quantum logic gates is achieved through the interaction of pulses and qubits.In the real physical world,qubits inevitably interact with the surrounding environment,resulting in energy dissipation and coherence loss of the qubits.Therefore,how to maintain the coherence of qubits and extend the coherence time of quantum systems has become an important issue in the research of qubits.In this paper,we have studied the quantum decoherence and the induced transparency effect of pulse transmission during the interaction between qubit and soliton pulse under the influence of environmental factors.In this paper,we analyze the physical properties of the interaction between soliton pulses and qubits,and apply the theory and methods of quantum open systems to derive the Lindblad form of the main equation under Markov approximation and adiabatic approximation.Combining the main equation and Maxwell's equation,the evolution law of qubits and microwave pulses with time under environmental dissipation conditions can be shown.The calculation results show that when the soliton pulse passes through the qubit,(1)environmental dissipation affects the area of the soliton pulse.Compared with the situation without environmental dissipation,the environmental dissipation makes the pulse area no longer an integer multiple of 2?.As the coupling degree increases,the pulse area will also increase during the interaction between the qubit and the pulse.When the coupling is strong enough,even soliton pulses cannot pass through the qubits.(2)The environmental dissipation causes the phase shift of the pulse.As the degree of coupling increases,the phase shift also increases.