Two-tone spectroscopy for the detection of two-level systems in superconducting qubits

• URL: http://arxiv.org/abs/2404.14039v1
• Date: Mon, 22 Apr 2024 09:53:00 GMT
• Title: Two-tone spectroscopy for the detection of two-level systems in superconducting qubits
• Authors: Olli Mansikkamäki, Alexander Tyner, Alexander Bilmes, Ilya Drozdov, Alexander Balatsky,
• Abstract summary: Two-level systems (TLS) of unclear physical origin are a major contributor to decoherence in superconducting qubits. We propose a novel method that requires only a microwave drive and dispersive readout, and thus also works fixed-frequency qubits.
• Score: 108.40985826142428
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Two-level systems (TLS) of unclear physical origin are a major contributor to decoherence in superconducting qubits. The interactions of individual TLS with a qubit can be detected via various spectroscopic methods, most of which have relied on the tunability of the qubit frequency. We propose a novel method that requires only a microwave drive and dispersive readout, and thus also works fixed-frequency qubits. The proposed two-tone spectroscopy involves a microwave pulse of varying frequency and length to excite TLSs of unknown frequencies, followed by a second pulse at the qubit frequency. TLS parameters can be estimated from the qubit population as a function of the first pulse frequency and length.

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