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

Peng Xu,Zheng-Yuan Xue,Xu-Chen Yang,Feng Mei

doi:10.1038/srep18695

Peng Xu, Zheng-Yuan Xue + Show 2 more

Open Access

https://doi.org/10.1038/srep18695

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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.

Highlights

In the past two decades, many advances in quantum computation have been achieved on various kinds of quantum systems
We propose a scheme based on adiabatic passage to realize quantum state transfer (QST) and quantum entanglement generation among three transmon qubits fabricated in a transmission line resonator
We take into account the cavity decay and qubit relaxation and analyze their influences on the quantum state transfer and quantum entanglement generation

Summary

Results

During the transfer process, the intermediate states emerge in a very short time range compared to the decoherence time, which is the reason why our scheme has high fidelity even in the presence of decoherence Another interesting characteristic during the system evolution is that the residence time on the populations of the quantum states is controllable through engineering the driven pulses, which provide an extra freedom to manipulate the QST in such framework.

We verify that the following two states

Discussion

Additional Information