Deterministic transfer of an unknown qutrit state assisted by the low-Q microwave resonators

TL;DR

This paper presents a deterministic scheme for transferring unknown quantum states between two flux qutrits using superconducting resonators, minimizing decoherence and crosstalk, and demonstrating feasibility with current technology.

Contribution

A novel measurement-free method for high-fidelity quantum state transfer between qutrits in circuit QED systems.

Findings

High-fidelity state transfer is feasible with current technology.

Resonator decay and crosstalk effects are significantly suppressed.

The scheme is adaptable to other solid-state qutrit systems.

Abstract

Qutrits (i.e., three-level quantum systems) can be used to achieve many quantum information and communication tasks due to their large Hilbert spaces. In this work, we propose a scheme to transfer an unknown quantum state between two flux qutrits coupled to two superconducting coplanar waveguide resonators. The quantum state transfer can be deterministically achieved without measurements. Because resonator photons are virtually excited during the operation time, the decoherences caused by the resonator decay and the unwanted inter-resonator crosstalk are greatly suppressed. Moreover, our approach can be adapted to other solid-state qutrits coupled to circuit resonators. Numerical simulations show that the high-fidelity transfer of quantum state between the two qutrits is feasible with current circuit QED technology.