Operation of a high-frequency, phase-slip qubit

• URL: http://arxiv.org/abs/2502.07043v1
• Date: Mon, 10 Feb 2025 21:22:24 GMT
• Title: Operation of a high-frequency, phase-slip qubit
• Authors: Cheeranjeev Purmessur, Kaicheung Chow, Bernard van Heck, Angela Kou,
• Abstract summary: We demonstrate the operation of a superconducting qubit based on a phase slip junction made using titanium nitride. We perform readout and coherent control of the superconducting qubit, and measure qubit lifetimes. Our results add the phase-slip junction as a tool for superconducting quantum information processing.
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• Abstract: Aluminum-based Josephson junctions are currently the main sources of nonlinearity for control and manipulation of superconducting qubits. A phase-slip junction, the dual of a Josephson junction, provides an alternative source of nonlinearity that promises new types of protected qubits and the possibility of high-temperature and high-frequency operation through the use of superconductors with larger energy gaps. Phase-slip junctions have been challenging, however, to incorporate into superconducting qubits because of difficulty controlling junction parameters. Here we demonstrate the operation of a superconducting qubit based on a phase slip junction made using titanium nitride. We operate the qubit at zero flux where the qubit frequency (~17 GHz) is mainly determined by the inductance of the qubit. We perform readout and coherent control of the superconducting qubit, and measure qubit lifetimes >60 $\mu$s. Finally, we demonstrate operation of the qubit at temperatures exceeding 300 mK. Our results add the phase-slip junction as a tool for superconducting quantum information processing and opens avenues for new classes of superconducting qubits.

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