Deterministic remote entanglement of superconducting circuits through microwave two-photon transitions

TL;DR

This paper demonstrates deterministic entanglement of two remote superconducting transmon qubits via microwave two-photon transitions, achieving a Bell state fidelity of 73%, advancing quantum network capabilities.

Contribution

It introduces a method for entangling distant superconducting qubits using Raman stimulated emission and absorption of traveling microwave photons, with detailed fidelity analysis.

Findings

Achieved 73% Bell state fidelity.

Successfully entangled remote superconducting qubits.

Fidelity limited by transmission line losses and qubit decoherence.

Abstract

Large-scale quantum information processing networks will most probably require the entanglement of distant systems that do not interact directly. This can be done by performing entangling gates between standing information carriers, used as memories or local computational resources, and flying ones, acting as quantum buses. We report the deterministic entanglement of two remote transmon qubits by Raman stimulated emission and absorption of a traveling photon wavepacket. We achieve a Bell state fidelity of 73 %, well explained by losses in the transmission line and decoherence of each qubit.