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arXiv · 2503.04295

Implementation of a quantum addressable router using superconducting qubits

Connie Miao·Sébastien Léger·Ziqian Li·Gideon Lee·Liang Jiang·David I. Schuster
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Abstract

The implementation of a quantum router capable of performing both quantum signal routing and quantum addressing (a Q2-router) represents a key step toward building quantum networks and quantum random access memories. We realize a Q2-router that uses fixed-frequency transmon qubits to implement a routing protocol based on two native controlled-iSWAP gates. These gates leverage a large ZZ interaction to selectively route information according to a quantum address. We find an estimated average routing fidelity of 95.3%, with errors arising primarily from decoherence or state preparation and measurement. We present a comprehensive calibration and characterization of both the c-iSWAP gates and the overall routing protocol through randomized benchmarking techniques and state tomography.

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Connie Miao, Sébastien Léger, Ziqian Li, Gideon Lee, Liang Jiang, David I. Schuster. 2025-03-06. Implementation of a quantum addressable router using superconducting qubits. https://doi.org/10.1103/pq3x-cmw9

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