Implementation of a Quantum Addressable Router Using Superconducting Qubits
Connie Miao, Sébastien Léger, Ziqian Li, Gideon Lee, Liang Jiang, David I. Schuster
DOI 10.1103/pq3x-cmw9 · PRX Quantum
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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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