Saved in:
| Main Authors: | , , , |
|---|---|
| Format: | Preprint |
| Published: |
2024
|
| Subjects: | |
| Online Access: | https://arxiv.org/abs/2408.14768 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866916370827968512 |
|---|---|
| author | Kim, Jin-Woo Lim, Suseong Kim, Heonoh Rhee, June-Koo Kevin |
| author_facet | Kim, Jin-Woo Lim, Suseong Kim, Heonoh Rhee, June-Koo Kevin |
| contents | A high-brightness entangled photon pair (HBEPP) source is essential for conducting entanglement-based quantum key distribution (QKD) between a satellite and a ground station. While an ultrabright source can overcome significant losses in satellite-based QKD (SQKD) and increase the sifted key rate, it also induces the multi-photon effect, raising the system's error rate. To accurately estimate system performance, we first present an analytical model for calculating the measurement probabilities of HBEPP distribution through an asymmetric loss channel. Based on this model, we propose the use of a passive-intensity HBEPP source for SQKD systems, assuming a polarization-independent channel and threshold detectors for measurement. We confirm that fixing the mean photon number at $\barμ=0.1$ achieves a performance of $99.7\%$ compared to the ideal one-way communication entanglement-based SQKD protocol, which is effectively optimizing the HBEPP source brightness in accordance with system losses. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_14768 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Strategy of satellite QKD with passive high brightness entangled photon pair source Kim, Jin-Woo Lim, Suseong Kim, Heonoh Rhee, June-Koo Kevin Quantum Physics 81V80 A high-brightness entangled photon pair (HBEPP) source is essential for conducting entanglement-based quantum key distribution (QKD) between a satellite and a ground station. While an ultrabright source can overcome significant losses in satellite-based QKD (SQKD) and increase the sifted key rate, it also induces the multi-photon effect, raising the system's error rate. To accurately estimate system performance, we first present an analytical model for calculating the measurement probabilities of HBEPP distribution through an asymmetric loss channel. Based on this model, we propose the use of a passive-intensity HBEPP source for SQKD systems, assuming a polarization-independent channel and threshold detectors for measurement. We confirm that fixing the mean photon number at $\barμ=0.1$ achieves a performance of $99.7\%$ compared to the ideal one-way communication entanglement-based SQKD protocol, which is effectively optimizing the HBEPP source brightness in accordance with system losses. |
| title | Strategy of satellite QKD with passive high brightness entangled photon pair source |
| topic | Quantum Physics 81V80 |
| url | https://arxiv.org/abs/2408.14768 |