Two-tone spectroscopy for the detection of two-level systems in superconducting qubits
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arXiv
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| Autori principali: | , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866916217296519168 |
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| author | Mansikkamäki, Olli Tyner, Alexander Bilmes, Alexander Drozdov, Ilya Balatsky, Alexander |
| author_facet | Mansikkamäki, Olli Tyner, Alexander Bilmes, Alexander Drozdov, Ilya Balatsky, Alexander |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_14039 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Two-tone spectroscopy for the detection of two-level systems in superconducting qubits Mansikkamäki, Olli Tyner, Alexander Bilmes, Alexander Drozdov, Ilya Balatsky, Alexander Quantum Physics 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. |
| title | Two-tone spectroscopy for the detection of two-level systems in superconducting qubits |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2404.14039 |