Controllable high-fidelity quantum state transfer and entanglement generation in circuit QED

TL;DR

This paper presents a scheme for controllable, high-fidelity quantum state transfer and entanglement generation in circuit QED systems using adiabatic passage, demonstrating robustness against decoherence and inhomogeneity.

Contribution

It introduces a novel adiabatic passage-based method for efficient quantum state transfer and entanglement in circuit QED, with robustness to experimental imperfections.

Findings

High fidelity state transfer achievable between arbitrary qubits

Robustness against cavity decay and qubit relaxation

Insensitive to inhomogeneous qubit-resonator coupling

Abstract

We propose a scheme to realize controllable quantum state transfer and entanglement generation among transmon qubits in the typical circuit QED setup based on adiabatic passage. Through designing the time-dependent driven pulses applied on the transmon qubits, we find that fast quantum sate transfer can be achieved between arbitrary two qubits and quantum entanglement among the qubits also can also be engineered. Furthermore, we numerically analyzed the influence of the decoherence on our scheme with the current experimental accessible systematical parameters. The result shows that our scheme is very robust against both the cavity decay and qubit relaxation, the fidelities of the state transfer and entanglement preparation process could be very high. In addition, our scheme is also shown to be insensitive to the inhomogeneous of qubit-resonator coupling strengths.