Unwanted couplings can induce amplification in quantum memories despite negligible apparent noise
Fuente:
arXiv
Saved in:
| Main Authors: | , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2024
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866915399313915904 |
|---|---|
| author | Asadi, Faezeh Kimiaee Kumar, Janish Ji, Jiawei Heshami, Khabat Simon, Christoph |
| author_facet | Asadi, Faezeh Kimiaee Kumar, Janish Ji, Jiawei Heshami, Khabat Simon, Christoph |
| contents | Theoretical quantum memory design often involves selectively focusing on certain energy levels to mimic an ideal $Λ$-configuration, a common approach that may unintentionally overlook the impact of neighboring levels or undesired couplings. While this simplification may be justified in certain protocols or platforms, it can significantly distort the achievable memory performance. Through numerical semi-classical analysis, we show that the presence of unwanted energy levels and undesired couplings in an NV-center-based absorptive memory can significantly amplify the signal, resulting in memory efficiencies exceeding unity, a clear indication of unwanted noise at the quantum level. Strikingly, this effect occurs even when the apparent noise i.e., output in the absence of an input field, is negligible. We then generalize our results using semi-analytical estimations to analyze this amplification, and propose a strategy to reduce its effect. Our findings extend to memory platforms beyond NV centers; as an example, we also analyze a cavity-based rubidium memory that experiences the same issue. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_15362 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Unwanted couplings can induce amplification in quantum memories despite negligible apparent noise Asadi, Faezeh Kimiaee Kumar, Janish Ji, Jiawei Heshami, Khabat Simon, Christoph Quantum Physics Theoretical quantum memory design often involves selectively focusing on certain energy levels to mimic an ideal $Λ$-configuration, a common approach that may unintentionally overlook the impact of neighboring levels or undesired couplings. While this simplification may be justified in certain protocols or platforms, it can significantly distort the achievable memory performance. Through numerical semi-classical analysis, we show that the presence of unwanted energy levels and undesired couplings in an NV-center-based absorptive memory can significantly amplify the signal, resulting in memory efficiencies exceeding unity, a clear indication of unwanted noise at the quantum level. Strikingly, this effect occurs even when the apparent noise i.e., output in the absence of an input field, is negligible. We then generalize our results using semi-analytical estimations to analyze this amplification, and propose a strategy to reduce its effect. Our findings extend to memory platforms beyond NV centers; as an example, we also analyze a cavity-based rubidium memory that experiences the same issue. |
| title | Unwanted couplings can induce amplification in quantum memories despite negligible apparent noise |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2411.15362 |