Quantum information transfer and entangled state generation using superconducting qubits in the absence and presence of dissipation

Abstract

In this paper, we propose a scheme for quantum information transfer by a gap-tunable bridge qubit between two superconducting (SC) qubits, which are initially prepared in separable quantum states. As is observed, enough high-fidelity and maximally entanglement between the two superconducting resonators, as well as between the two of qubits, can be achieved. It is shown that by implementing driven magnetic field to high detuned superconducting qubits, we are able to induce sidebands in the qubit–resonator and also qubit–qubit couplings. The influence of decay rates of qubits and resonator modes on the dynamics of quantum fidelity and entanglement is also investigated, either individually or simultaneously, by numerical analysis. Our numerical results show that the decay rate parameters have destructive, constructive, and no critical effect on the fidelity, depending on the chosen decay parameters. Moreover, they have destructive effects on the generated entangled state in the outlined quantum information transfer process.