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  • Letter
  • Open Access

Hardware-efficient stabilization of entanglement via engineered dissipation in superconducting circuits

Changling Chen1,2,*, Kai Tang2,3,*, Yuxuan Zhou2,3, KangYuan Yi2,3, Xuan Zhang2,3, Xu Zhang2,3, Haosheng Guo2,3, Song Liu1,2,4,5, Yuanzhen Chen3,6,7,† et al.

Tongxing Yan1,2,4,‡ and Dapeng Yu1,2,3,4,5

  • *These authors contributed equally to this work.
  • †Contact author: chenyz@sustech.edu.cn
  • ‡Contact author: yantx@sustech.edu.cn

Phys. Rev. Research 7, L022018 – Published 16 April, 2025

DOI: https://doi.org/10.1103/PhysRevResearch.7.L022018

Abstract

Generation and preservation of quantum entanglement are among the primary tasks in quantum information processing. State stabilization via quantum bath engineering offers a resource-efficient approach to achieve this objective. However, current methods for engineering dissipative channels to stabilize target entangled states often require specialized hardware designs, complicating experimental realization and hindering their compatibility with scalable quantum computation architectures. In this work, we propose and experimentally demonstrate a stabilization protocol readily implementable in the mainstream integrated superconducting quantum circuits. The approach utilizes a Raman process involving a resonant (or nearly resonant) superconducting qubit array and the qubits' dedicated readout resonators to effectively develop nonlocal dissipative channels. Leveraging individual controllability of the qubits and resonators, the protocol stabilizes two-qubit Bell states with a fidelity of 90.7%, marking the highest reported value in solid-state platforms to date. Furthermore, by extending this strategy to include three qubits, an entangled W state is achieved with a fidelity of 86.2%. This demonstrates the protocol's extensibility beyond two-qubit systems. Notably, the protocol is of practical interest since it only utilizes existing hardware common to standard operations in the underlying superconducting circuits, thereby facilitating the exploration of many-body quantum entanglement with dissipative resources.

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