Probing the memory of a superconducting qubit environment
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arXiv
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| Format: | Preprint |
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2026
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| _version_ | 1866908881917050880 |
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| author | Gosling, Nicolas Bénâtre, Denis Zapata, Nicolas Kugler, Paul Field, Mitchell Hazra, Sumeru Günzler, Simon Reisinger, Thomas Spiecker, Martin Féchant, Mathieu Pop, Ioan M. |
| author_facet | Gosling, Nicolas Bénâtre, Denis Zapata, Nicolas Kugler, Paul Field, Mitchell Hazra, Sumeru Günzler, Simon Reisinger, Thomas Spiecker, Martin Féchant, Mathieu Pop, Ioan M. |
| contents | Achieving fault tolerance with superconducting quantum processors requires qubits to operate within the regime of threshold theorems based on the Born-Markov approximation. This approximation, which models dissipation as constant energy decay into a memoryless environment, breaks down when qubits couple to long-lived two-level systems (TLSs) that become polarized during operation and retain memory of past qubit states. Here, we show that non-Poissonian quantum jump traces carry the information required to distinguish long-lived TLSs from the standard Markovian bath. By fitting the Solomon equations to measured quantum jumps dynamics arising naturally due to thermal fluctuations, we can disentangle the coupling of the qubit to the two environments. Sweeping the qubit frequency reveals distinct peaks, each associated with a TLS that outlives the qubit, providing a handle to understand their microscopic origin. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_11889 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Probing the memory of a superconducting qubit environment Gosling, Nicolas Bénâtre, Denis Zapata, Nicolas Kugler, Paul Field, Mitchell Hazra, Sumeru Günzler, Simon Reisinger, Thomas Spiecker, Martin Féchant, Mathieu Pop, Ioan M. Quantum Physics Achieving fault tolerance with superconducting quantum processors requires qubits to operate within the regime of threshold theorems based on the Born-Markov approximation. This approximation, which models dissipation as constant energy decay into a memoryless environment, breaks down when qubits couple to long-lived two-level systems (TLSs) that become polarized during operation and retain memory of past qubit states. Here, we show that non-Poissonian quantum jump traces carry the information required to distinguish long-lived TLSs from the standard Markovian bath. By fitting the Solomon equations to measured quantum jumps dynamics arising naturally due to thermal fluctuations, we can disentangle the coupling of the qubit to the two environments. Sweeping the qubit frequency reveals distinct peaks, each associated with a TLS that outlives the qubit, providing a handle to understand their microscopic origin. |
| title | Probing the memory of a superconducting qubit environment |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2603.11889 |