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  • Open Access

Entangling superconducting qubits via energy-selective local reservoirs

Qihao Guo, Botao Du, and Ruichao Ma*

  • Department of Physics and Astronomy, Purdue University, West Lafayette, Indiana 47907, USA

  • *Contact author: maruichao@purdue.edu
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Phys. Rev. Research 8, 033175 – Published 11 August, 2026

DOI: https://doi.org/10.1103/mr1g-zqtq

Abstract

Engineered dissipation provides a powerful route to controlling and stabilizing quantum states in open systems. Superconducting circuits are particularly suited to this approach due to their tunable coupling to dissipative environments. Here, we realize programmable local reservoirs for superconducting qubits through parametrically driven couplings to readout resonators, creating energy-selective incoherent pump and loss. Using coupled superconducting qubits, we autonomously stabilize entangled single-excitation states with fidelity up to 90.8%. We probe the stabilization dynamics under varying initial conditions and bath parameters, and implement robust classical shadow estimation for accurate and scalable state characterization. Finally, we numerically study a configuration where the engineered pump and loss share a common dissipative mode, leading to reservoir-mediated interference and classically correlated steady states. Our results demonstrate a scalable and hardware-efficient framework for dissipative preparation and control of correlated many-body states in superconducting circuits.

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Phys. Rev. Research 8, 033175– Published 11 August, 2026
  • Received 15 May 2026
  • Accepted 27 July 2026
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