Stabilizing entanglement via symmetry-selective bath engineering in superconducting qubits

TL;DR

This paper demonstrates a resource-efficient method to stabilize entanglement between superconducting qubits using symmetry-selective bath engineering, achieving high fidelity and scalability.

Contribution

It introduces a novel symmetry-selective dissipative approach for stabilizing entanglement in superconducting qubits, with potential for scalable quantum networks.

Findings

Achieved steady-state Bell state fidelity of 0.70.

Suppressed opposite symmetry Bell states via parity selection.

Method is scalable to multiple qubits.

Abstract

Bath engineering, which utilizes coupling to lossy modes in a quantum system to generate non-trivial steady states, is a tantalizing alternative to gate- and measurement-based quantum science. Here, we demonstrate dissipative stabilization of entanglement between two superconducting transmon qubits in a symmetry-selective manner. We utilize the engineered symmetries of the dissipative environment to stabilize a target Bell state; we further demonstrate suppression of the Bell state of opposite symmetry due to parity selection rules. This implementation is resource-efficient, achieves a steady-state fidelity $\mathcal{F} = 0.70$, and is scalable to multiple qubits.