Tunable passive squeezing of squeezed light through unbalanced double homodyne detection
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arXiv
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| Auteurs principaux: | , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866909998614839296 |
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| author | Tripier-Mondancin, Niels Barral, David Roeland, Ganaël Celis, Raúl Leonardo Rincon Bouchereau, Yann Treps, Nicolas |
| author_facet | Tripier-Mondancin, Niels Barral, David Roeland, Ganaël Celis, Raúl Leonardo Rincon Bouchereau, Yann Treps, Nicolas |
| contents | The full characterization of quantum states of light is a central task in quantum optics and information science. Double homodyne detection provides a powerful method for the direct measurement of the Husimi Q quasi-probability distribution, offering a complete state representation in a simple experimental setting and a limited time frame. Here, we demonstrate that double homodyne detection can serve as more than a passive characterization tool. By intentionally unbalancing the input beamsplitter that splits the quantum signal, we show that the detection scheme itself performs an effective squeezing or anti-squeezing transformation on the state being measured. The resulting measurement directly samples the Q function of the input state as if it were acted upon by a squeezing operator whose strength is a tunable experimental parameter: the beamsplitter's reflectivity. We experimentally realize this technique using a robust polarization-encoded double homodyne detection to characterize a squeezed vacuum state. Our results demonstrate the controlled deformation of the measured Q function's phase-space distribution, confirming that unbalanced double homodyne detection is a versatile tool for simultaneous quantum state manipulation and characterization. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_08540 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Tunable passive squeezing of squeezed light through unbalanced double homodyne detection Tripier-Mondancin, Niels Barral, David Roeland, Ganaël Celis, Raúl Leonardo Rincon Bouchereau, Yann Treps, Nicolas Quantum Physics Optics The full characterization of quantum states of light is a central task in quantum optics and information science. Double homodyne detection provides a powerful method for the direct measurement of the Husimi Q quasi-probability distribution, offering a complete state representation in a simple experimental setting and a limited time frame. Here, we demonstrate that double homodyne detection can serve as more than a passive characterization tool. By intentionally unbalancing the input beamsplitter that splits the quantum signal, we show that the detection scheme itself performs an effective squeezing or anti-squeezing transformation on the state being measured. The resulting measurement directly samples the Q function of the input state as if it were acted upon by a squeezing operator whose strength is a tunable experimental parameter: the beamsplitter's reflectivity. We experimentally realize this technique using a robust polarization-encoded double homodyne detection to characterize a squeezed vacuum state. Our results demonstrate the controlled deformation of the measured Q function's phase-space distribution, confirming that unbalanced double homodyne detection is a versatile tool for simultaneous quantum state manipulation and characterization. |
| title | Tunable passive squeezing of squeezed light through unbalanced double homodyne detection |
| topic | Quantum Physics Optics |
| url | https://arxiv.org/abs/2512.08540 |