dorsal/arxiv
View SchemaOn the performance of two protocols: SARG04 and BB84
| Authors | Chi-Hang Fred Fung, Kiyoshi Tamaki, Hoi-Kwong Lo |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0510025 |
| URL | https://arxiv.org/abs/quant-ph/0510025 |
| DOI | 10.1103/PhysRevA.73.012337 |
| Journal | Phys. Rev. A 73, 012337 (2006) |
Abstract
We compare the performance of BB84 and SARG04, the later of which was proposed by V. Scarani et al., in Phys. Rev. Lett. 92, 057901 (2004). Specifically, in this paper, we investigate SARG04 with two-way classical communications and SARG04 with decoy states. In the first part of the paper, we show that SARG04 with two-way communications can tolerate a higher bit error rate (19.4% for a one-photon source and 6.56% for a two-photon source) than SARG04 with one-way communications (10.95% for a one-photon source and 2.71% for a two-photon source). Also, the upper bounds on the bit error rate for SARG04 with two-way communications are computed in a closed form by considering an individual attack based on a general measurement. In the second part of the paper, we propose employing the idea of decoy states in SARG04 to obtain unconditional security even when realistic devices are used. We compare the performance of SARG04 with decoy states and BB84 with decoy states. We find that the optimal mean-photon number for SARG04 is higher than that of BB84 when the bit error rate is small. Also, we observe that SARG04 does not achieve a longer secure distance and a higher key generation rate than BB84, assuming a typical experimental parameter set.
{
"annotation_id": "18e33f3c-cc44-4783-a87f-1df9459ed984",
"date_created": "2026-03-02T18:02:19.966000Z",
"date_modified": "2026-03-02T18:02:19.966000Z",
"file_hash": "353ca7491e7d8bed254fc5c5f719bb152bcbdfa03834986e8fff3fd22cbea5a8",
"private": false,
"record": {
"abstract": "We compare the performance of BB84 and SARG04, the later of which was\nproposed by V. Scarani et al., in Phys. Rev. Lett. 92, 057901 (2004).\nSpecifically, in this paper, we investigate SARG04 with two-way classical\ncommunications and SARG04 with decoy states. In the first part of the paper, we\nshow that SARG04 with two-way communications can tolerate a higher bit error\nrate (19.4% for a one-photon source and 6.56% for a two-photon source) than\nSARG04 with one-way communications (10.95% for a one-photon source and 2.71%\nfor a two-photon source). Also, the upper bounds on the bit error rate for\nSARG04 with two-way communications are computed in a closed form by considering\nan individual attack based on a general measurement. In the second part of the\npaper, we propose employing the idea of decoy states in SARG04 to obtain\nunconditional security even when realistic devices are used. We compare the\nperformance of SARG04 with decoy states and BB84 with decoy states. We find\nthat the optimal mean-photon number for SARG04 is higher than that of BB84 when\nthe bit error rate is small. Also, we observe that SARG04 does not achieve a\nlonger secure distance and a higher key generation rate than BB84, assuming a\ntypical experimental parameter set.",
"arxiv_id": "quant-ph/0510025",
"authors": [
"Chi-Hang Fred Fung",
"Kiyoshi Tamaki",
"Hoi-Kwong Lo"
],
"categories": [
"quant-ph"
],
"doi": "10.1103/PhysRevA.73.012337",
"journal_ref": "Phys. Rev. A 73, 012337 (2006)",
"title": "On the performance of two protocols: SARG04 and BB84",
"url": "https://arxiv.org/abs/quant-ph/0510025"
},
"schema_id": "dorsal/arxiv",
"source": {
"execution_id": "8902cea8-4018-4b59-9fc0-ba6013ac3af1",
"id": "arXiv Dataset IDs",
"type": "Model",
"variant": "snapshot-2026-03-01",
"version": "0.1.0"
},
"user_id": 1000002
}