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| Main Authors: | , , |
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| Format: | Preprint |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2603.11507 |
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| _version_ | 1866914412047106048 |
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| author | Dong, Zhiyuan Liang, Weichao Zhang, Guofeng |
| author_facet | Dong, Zhiyuan Liang, Weichao Zhang, Guofeng |
| contents | We establish a framework for realizing back-action-evading (BAE) measurements and quantum non-demolition (QND) variables in linear quantum systems. The key condition, a purely imaginary Hamiltonian with a real or imaginary coupling operator, enables BAE measurements of conjugate observables. Symmetric coupling further yields QND variables. For non-compliant systems, coherent feedback can engineer BAE measurements. Crucially, the QND interaction condition simultaneously ensures BAE measurements and promotes the coupling operator to a QND observable. This work provides a unified structural theory for enhancing precision in quantum metrology and sensing. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_11507 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Back-Action-Evading Measurements and Quantum Non-Demolition Variables via Linear Systems Engineering Dong, Zhiyuan Liang, Weichao Zhang, Guofeng Quantum Physics We establish a framework for realizing back-action-evading (BAE) measurements and quantum non-demolition (QND) variables in linear quantum systems. The key condition, a purely imaginary Hamiltonian with a real or imaginary coupling operator, enables BAE measurements of conjugate observables. Symmetric coupling further yields QND variables. For non-compliant systems, coherent feedback can engineer BAE measurements. Crucially, the QND interaction condition simultaneously ensures BAE measurements and promotes the coupling operator to a QND observable. This work provides a unified structural theory for enhancing precision in quantum metrology and sensing. |
| title | Back-Action-Evading Measurements and Quantum Non-Demolition Variables via Linear Systems Engineering |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2603.11507 |