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Implementation of a quantum addressable router using superconducting qubits
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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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Experimental realization of the bucket-brigade quantum random access memory
A two- and three-layer bucket-brigade QRAM was realized on a superconducting processor, achieving query fidelities up to 0.800 with a router-qubit error-mitigation scheme.
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