Progress in the High Coherence 3D SRF Superconducting Quantum Processor Unit (QPU) Development at Fermilab

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One of the primary goals of the Fermilab-led Superconducting Quantum Materials and Systems (SQMS) center, which includes more than 300 collaborators from national labs, academia, and industry, is bringing about transformational advances in the achievable coherence of 2D and 3D superconducting qubits and quantum processors. In this contribution I will review the progress in this direction, both in the high Q SRF cavity-based integrated quantum processor realization, as well as a multitude of the materials science and physics advances achieved by SQMS over the recent period. In particular, the new understanding and mitigation of the two-level-system (TLS) dissipation in the niobium-based qubits and cavities has been developed, limits on the surface resistance decoherence have been established, and bulk dielectric losses of silicon substrates using the SRF-cavity based testbeds have been measured. These advances allow for the first time to predict the upper limit to the coherence of the 2D niobium-based qubits, as well as guide the TLS mitigation and subsequent prevention effort. The quantum operation of the integrated 3D SRF-transmon system has been demonstrated, with the current effort focused on optimizing the transmon-cavity coupling parameters and the optimal ways of utilizing the long coherence cavity quantum states for computation, simulation, and fundamental physics experiments such as dark matter searches.

One of the primary goals of the Fermilab-led Superconducting Quantum Materials and Systems (SQMS) center, which includes more than 300 collaborators from national labs, academia, and industry, is bringing about transformational advances in the achievable coherence of 2D and 3D superconducting qubits and quantum processors. In this contribution I will review the progress in this direction, both in the high Q SRF cavity-based integrated quantum processor realization, as well as a multitude of the materials science and physics advances achieved by SQMS over the recent period. In particular, the new understanding and mitigation of the two-level-system (TLS) dissipation in the niobium-based qubits and cavities has been developed, limits on the surface resistance decoherence have been established, and bulk dielectric losses of silicon substrates using the SRF-cavity based testbeds have been measured. These advances allow

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