Characterization of hidden modes in networks of superconducting qubits

Abstract

We present a method for detecting electromagnetic (EM) modes that couple to a superconducting qubit in a circuit-QED architecture. Based on measurement-induced dephasing, this technique allows the measurement of modes that have a high quality factor (Q) and may be difficult to detect through standard transmission and reflection measurements at the device ports. In this scheme the qubit itself acts as a sensitive phase meter, revealing modes that couple to it through measurements of its coherence time. Such modes are indistinguishable from EM modes that do not couple to the qubit using a vector network analyzer. Moreover, this technique provides useful characterization parameters including the quality factor and the coupling strength of the unwanted resonances. We demonstrate the method for detecting both high-Q coupling resonators in planar devices as well as spurious modes produced by a 3D cavity.

4 pages, 2 figures; updated to published version

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• Microwave Package Design for Superconducting Quantum Processors
• Observation of Josephson Harmonics in Tunnel Junctions
• Voltage-tunable superconducting resonators: a platform for random access quantum memory
• Development of transmon qubits solely from optical lithography on 300mm wafers
• Efficient decoupling of a non-linear qubit mode from its environment
• Mitigating coherent leakage of superconducting qubits in a large-scale quantum socket
• Identification and Mitigation of Conducting Package Losses for Quantum Superconducting Devices