dorsal/arxiv
View SchemaExperimental quantum key distribution with active phase randomization
| Authors | Yi Zhao, Bing Qi, Hoi-Kwong Lo |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0611059 |
| URL | https://arxiv.org/abs/quant-ph/0611059 |
| DOI | 10.1063/1.2432296 |
| Journal | Appl. Phys. Lett., 90 (4), 044106 (2007) |
Abstract
Phase randomization is an important assumption made in many security proofs of practical quantum key distribution (QKD) systems. Here, we present the first experimental demonstration of QKD with reliable active phase randomization. One key contribution is a polarization-insensitive phase modulator, which we added to a commercial phase-coding QKD system to randomize the global phase of each bit. We also proposed a simple but useful method to verify experimentally that the phase is indeed randomized. Our result shows very low QBER (<1%). We expect this active phase randomization process to be a standard part in future QKD set-ups due to its significance and feasibility.
{
"annotation_id": "93afb2f5-e0b6-4ba2-9a3b-45aaaac997c5",
"date_created": "2026-03-02T18:02:30.557000Z",
"date_modified": "2026-03-02T18:02:30.557000Z",
"file_hash": "7e9b91769668f1a8e05a999b640b16bfa4b2dc30f4ad4f640450a7d54a2196e6",
"private": false,
"record": {
"abstract": "Phase randomization is an important assumption made in many security proofs\nof practical quantum key distribution (QKD) systems. Here, we present the first\nexperimental demonstration of QKD with reliable active phase randomization. One\nkey contribution is a polarization-insensitive phase modulator, which we added\nto a commercial phase-coding QKD system to randomize the global phase of each\nbit. We also proposed a simple but useful method to verify experimentally that\nthe phase is indeed randomized. Our result shows very low QBER (\u003c1%). We expect\nthis active phase randomization process to be a standard part in future QKD\nset-ups due to its significance and feasibility.",
"arxiv_id": "quant-ph/0611059",
"authors": [
"Yi Zhao",
"Bing Qi",
"Hoi-Kwong Lo"
],
"categories": [
"quant-ph"
],
"doi": "10.1063/1.2432296",
"journal_ref": "Appl. Phys. Lett., 90 (4), 044106 (2007)",
"title": "Experimental quantum key distribution with active phase randomization",
"url": "https://arxiv.org/abs/quant-ph/0611059"
},
"schema_id": "dorsal/arxiv",
"source": {
"execution_id": "73cdc442-a6ea-4c82-88e8-92bc1341e401",
"id": "arXiv Dataset IDs",
"type": "Model",
"variant": "snapshot-2026-03-01",
"version": "0.1.0"
},
"user_id": 1000002
}