Saved in:
| Main Authors: | , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2024
|
| Subjects: | |
| Online Access: | https://arxiv.org/abs/2405.06863 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866929339636908032 |
|---|---|
| author | Guo, Yanqiang Zhang, Jianchao Hou, Jiahui Guo, Xiaomin Xiao, Liantuan |
| author_facet | Guo, Yanqiang Zhang, Jianchao Hou, Jiahui Guo, Xiaomin Xiao, Liantuan |
| contents | Standard weak measurement with an assistant pointer and single weak interaction constrains measurement precision and quantity of interaction parameters, and a compelling characterization of quantum effect featuring weak-value amplification (WVA) remains elusive. Here, we theoretically and experimentally demonstrate an enhanced dual-pointer WVA scheme based on multiple weak interactions and variable spectrum sources. Developing triple weak interactions, momentum P pointer reaches an optimal time-difference precision of $3.34 \times {10^{-5}}$ as at 6 nm spectral width, and intensity I pointer achieves a displacement resolution of 148.8 fm within 400 kHz linewidth. A quantum effect associated with an anomalous weak value is revealed by an observable violation of a Leggett-Garg inequality. The I-pointer weak value is measured to be 1478 using multiple weak interactions and high signal-to-noise detection, achieving a two-order-of-magnitude WVA enhancement compared to standard weak measurement. Our work opens up a practical avenue for minuscule quantumness measurements in challenging environments. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_06863 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Ultraprecise time-difference measurement via enhanced dual pointers with multiple weak interactions Guo, Yanqiang Zhang, Jianchao Hou, Jiahui Guo, Xiaomin Xiao, Liantuan Quantum Physics Optics Standard weak measurement with an assistant pointer and single weak interaction constrains measurement precision and quantity of interaction parameters, and a compelling characterization of quantum effect featuring weak-value amplification (WVA) remains elusive. Here, we theoretically and experimentally demonstrate an enhanced dual-pointer WVA scheme based on multiple weak interactions and variable spectrum sources. Developing triple weak interactions, momentum P pointer reaches an optimal time-difference precision of $3.34 \times {10^{-5}}$ as at 6 nm spectral width, and intensity I pointer achieves a displacement resolution of 148.8 fm within 400 kHz linewidth. A quantum effect associated with an anomalous weak value is revealed by an observable violation of a Leggett-Garg inequality. The I-pointer weak value is measured to be 1478 using multiple weak interactions and high signal-to-noise detection, achieving a two-order-of-magnitude WVA enhancement compared to standard weak measurement. Our work opens up a practical avenue for minuscule quantumness measurements in challenging environments. |
| title | Ultraprecise time-difference measurement via enhanced dual pointers with multiple weak interactions |
| topic | Quantum Physics Optics |
| url | https://arxiv.org/abs/2405.06863 |