dorsal/arxiv
View SchemaRole of causality in ensuring unconditional security of relativistic quantum cryptography
| Authors | S. N. Molotkov, S. S. Nazin |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0106046 |
| URL | https://arxiv.org/abs/quant-ph/0106046 |
| DOI | 10.1134/1.1397755 |
Abstract
The problem of unconditional security of quantum cryptography (i.e. the security which is guaranteed by the fundamental laws of nature rather than by technical limitations) is one of the central points in quantum information theory. We propose a relativistic quantum cryptosystem and prove its unconditional security against any eavesdropping attempts. Relativistic causality arguments allow to demonstrate the security of the system in a simple way. Since the proposed protocol does not employ collective measurements and quantum codes, the cryptosystem can be experimentally realized with the present state-of-art in fiber optics technologies. The proposed cryptosystem employs only the individual measurements and classical codes and, in addition, the key distribution problem allows to postpone the choice of the state encoding scheme until after the states are already received instead of choosing it before sending the states into the communication channel (i.e. to employ a sort of ``antedate'' coding).
{
"annotation_id": "3ab7d04f-2482-48a4-8bd0-bf333de97de9",
"date_created": "2026-03-02T18:01:45.525000Z",
"date_modified": "2026-03-02T18:01:45.525000Z",
"file_hash": "45b6aa22ff299942232492c031ab7944d207932bccc05a645d6950312889474f",
"private": false,
"record": {
"abstract": "The problem of unconditional security of quantum cryptography (i.e. the\nsecurity which is guaranteed by the fundamental laws of nature rather than by\ntechnical limitations) is one of the central points in quantum information\ntheory. We propose a relativistic quantum cryptosystem and prove its\nunconditional security against any eavesdropping attempts. Relativistic\ncausality arguments allow to demonstrate the security of the system in a simple\nway. Since the proposed protocol does not employ collective measurements and\nquantum codes, the cryptosystem can be experimentally realized with the present\nstate-of-art in fiber optics technologies. The proposed cryptosystem employs\nonly the individual measurements and classical codes and, in addition, the key\ndistribution problem allows to postpone the choice of the state encoding scheme\nuntil after the states are already received instead of choosing it before\nsending the states into the communication channel (i.e. to employ a sort of\n``antedate\u0027\u0027 coding).",
"arxiv_id": "quant-ph/0106046",
"authors": [
"S. N. Molotkov",
"S. S. Nazin"
],
"categories": [
"quant-ph"
],
"doi": "10.1134/1.1397755",
"title": "Role of causality in ensuring unconditional security of relativistic quantum cryptography",
"url": "https://arxiv.org/abs/quant-ph/0106046"
},
"schema_id": "dorsal/arxiv",
"source": {
"execution_id": "62a5d4de-5726-4b4c-b15f-868ac9a83b7b",
"id": "arXiv Dataset IDs",
"type": "Model",
"variant": "snapshot-2026-03-01",
"version": "0.1.0"
},
"user_id": 1000002
}