Implementation of a quantum addressable router using superconducting qubits

• URL: http://arxiv.org/abs/2503.04295v2
• Date: Thu, 03 Apr 2025 20:24:44 GMT
• Title: Implementation of a quantum addressable router using superconducting qubits
• Authors: Connie Miao, Sébastien Léger, Ziqian Li, Gideon Lee, Liang Jiang, David I. Schuster,
• Abstract summary: We realize a Q2-router that uses fixed-frequency transmon qubits to implement a routing protocol based on two native controlled-iSWAP gates.<n>We find an estimated average routing fidelity of 95.3%, with errors arising primarily from decoherence or state preparation and measurement.
• Score: 1.882190456060289
• License: http://creativecommons.org/licenses/by/4.0/
• 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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