Measurement and Control of the Complex Berry Phase in a Quantum System
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arXiv
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| Autores principales: | , , , , |
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| Formato: | Preprint |
| Publicado: |
2026
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| _version_ | 1866916017923424256 |
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| author | Barge, Pratik J. Cao, Qian Hörnedal, Niklas Chenu, Aurélia Murch, Kater W. |
| author_facet | Barge, Pratik J. Cao, Qian Hörnedal, Niklas Chenu, Aurélia Murch, Kater W. |
| contents | The Berry phase is a geometric phase acquired during adiabatic evolution over a closed loop in parameter space. It plays an essential role in geometric quantum gates and other phase-based protocols. In non-Hermitian systems, the Berry phase is complex, introducing fundamentally new geometric effects, including state amplification. In this work, we report experimental measurement of both the real and imaginary components of a Berry phase in a fully quantum system using a superconducting transmon circuit with engineered dissipation. We also demonstrate the path-dependent effects of the imaginary part on the dissipation and its utility in the implementation of non-unitary quantum control. These findings establish a clear geometric distinction between the real and imaginary components of the Berry phase and experimentally confirm the unique adiabatic behavior of non-Hermitian quantum systems. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_16559 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Measurement and Control of the Complex Berry Phase in a Quantum System Barge, Pratik J. Cao, Qian Hörnedal, Niklas Chenu, Aurélia Murch, Kater W. Quantum Physics Applied Physics The Berry phase is a geometric phase acquired during adiabatic evolution over a closed loop in parameter space. It plays an essential role in geometric quantum gates and other phase-based protocols. In non-Hermitian systems, the Berry phase is complex, introducing fundamentally new geometric effects, including state amplification. In this work, we report experimental measurement of both the real and imaginary components of a Berry phase in a fully quantum system using a superconducting transmon circuit with engineered dissipation. We also demonstrate the path-dependent effects of the imaginary part on the dissipation and its utility in the implementation of non-unitary quantum control. These findings establish a clear geometric distinction between the real and imaginary components of the Berry phase and experimentally confirm the unique adiabatic behavior of non-Hermitian quantum systems. |
| title | Measurement and Control of the Complex Berry Phase in a Quantum System |
| topic | Quantum Physics Applied Physics |
| url | https://arxiv.org/abs/2605.16559 |