Local-oscillator-agnostic squeezing detection
Fuente:
arXiv
Guardado en:
| Autores principales: | , , , , , |
|---|---|
| Formato: | Preprint |
| Publicado: |
2026
|
| Materias: | |
| Acceso en línea: | |
| Etiquetas: |
Agregar Etiqueta
Sin Etiquetas, Sea el primero en etiquetar este registro!
|
| _version_ | 1866914293024292864 |
|---|---|
| author | Krishnaswamy, Suchitra Maria, Dhrithi Ares, Laura Procopio, Lorenzo M. Bartley, Tim J. Sperling, Jan |
| author_facet | Krishnaswamy, Suchitra Maria, Dhrithi Ares, Laura Procopio, Lorenzo M. Bartley, Tim J. Sperling, Jan |
| contents | We address the problem of measuring nonclassicality in continuous-variable bosonic systems without having access to a known reference signal. To this end, we construct broader classes of criteria for nonclassicality which allow us to investigate quantum phenomena regardless of the quantumness of selected subsystems. Such witnesses are based on the notion of partial normal ordering. This approach is applied to balanced homodyne detection using arbitrary, potentially nonclassical local oscillator states, yet only revealing the probed signal's quantumness. Our framework is compared to standard techniques, and the robustness and advanced sensitivity of our approach is shown. Therefore, a widely applicable framework, well-suited for applications in quantum metrology and quantum information, is derived to assess the quantum features of a photonic system when a well-defined coherent laser as a reference state is not available in the physical domain under study. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_22291 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Local-oscillator-agnostic squeezing detection Krishnaswamy, Suchitra Maria, Dhrithi Ares, Laura Procopio, Lorenzo M. Bartley, Tim J. Sperling, Jan Quantum Physics We address the problem of measuring nonclassicality in continuous-variable bosonic systems without having access to a known reference signal. To this end, we construct broader classes of criteria for nonclassicality which allow us to investigate quantum phenomena regardless of the quantumness of selected subsystems. Such witnesses are based on the notion of partial normal ordering. This approach is applied to balanced homodyne detection using arbitrary, potentially nonclassical local oscillator states, yet only revealing the probed signal's quantumness. Our framework is compared to standard techniques, and the robustness and advanced sensitivity of our approach is shown. Therefore, a widely applicable framework, well-suited for applications in quantum metrology and quantum information, is derived to assess the quantum features of a photonic system when a well-defined coherent laser as a reference state is not available in the physical domain under study. |
| title | Local-oscillator-agnostic squeezing detection |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2601.22291 |