dorsal/arxiv
View SchemaQuantum Key Distribution in a Multi-User Network at Gigahertz Clock rates
| Authors | Veronica Fernandez, Karen J. Gordon, Robert J. Collins, Paul D. Townsend, Sergio D. Cova, Ivan Rech, Gerald S. Buller |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0605052 |
| URL | https://arxiv.org/abs/quant-ph/0605052 |
| Journal | Proceedings of SPIE, Volume 5840, "Photonic Materials, Devices, and Applications", (2005) |
Abstract
In recent years quantum information research has lead to the discovery of a number of remarkable new paradigms for information processing and communication. These developments include quantum cryptography schemes that offer unconditionally secure information transport guaranteed by quantum-mechanical laws. Such potentially disruptive security technologies could be of high strategic and economic value in the future. Two major issues confronting researchers in this field are the transmission range (typically <100km) and the key exchange rate, which can be as low as a few bits per second at long optical fiber distances. This paper describes further research of an approach to significantly enhance the key exchange rate in an optical fiber system at distances in the range of 1-20km. We will present results on a number of application scenarios, including point-to-point links and multi-user networks. Quantum key distribution systems have been developed, which use standard telecommunications optical fiber, and which are capable of operating at clock rates of up to 2GHz. They implement a polarization-encoded version of the B92 protocol and employ vertical-cavity surface-emitting lasers with emission wavelengths of 850 nm as weak coherent light sources, as well as silicon single-photon avalanche diodes as the single photon detectors. The point-to-point quantum key distribution system exhibited a quantum bit error rate of 1.4%, and an estimated net bit rate greater than 100,000 bits- per second for a 4.2 km transmission range.
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"abstract": "In recent years quantum information research has lead to the discovery of a\nnumber of remarkable new paradigms for information processing and\ncommunication. These developments include quantum cryptography schemes that\noffer unconditionally secure information transport guaranteed by\nquantum-mechanical laws. Such potentially disruptive security technologies\ncould be of high strategic and economic value in the future. Two major issues\nconfronting researchers in this field are the transmission range (typically\n\u003c100km) and the key exchange rate, which can be as low as a few bits per second\nat long optical fiber distances. This paper describes further research of an\napproach to significantly enhance the key exchange rate in an optical fiber\nsystem at distances in the range of 1-20km. We will present results on a number\nof application scenarios, including point-to-point links and multi-user\nnetworks. Quantum key distribution systems have been developed, which use\nstandard telecommunications optical fiber, and which are capable of operating\nat clock rates of up to 2GHz. They implement a polarization-encoded version of\nthe B92 protocol and employ vertical-cavity surface-emitting lasers with\nemission wavelengths of 850 nm as weak coherent light sources, as well as\nsilicon single-photon avalanche diodes as the single photon detectors. The\npoint-to-point quantum key distribution system exhibited a quantum bit error\nrate of 1.4%, and an estimated net bit rate greater than 100,000 bits- per\nsecond for a 4.2 km transmission range.",
"arxiv_id": "quant-ph/0605052",
"authors": [
"Veronica Fernandez",
"Karen J. Gordon",
"Robert J. Collins",
"Paul D. Townsend",
"Sergio D. Cova",
"Ivan Rech",
"Gerald S. Buller"
],
"categories": [
"quant-ph"
],
"journal_ref": "Proceedings of SPIE, Volume 5840, \"Photonic Materials, Devices,\n and Applications\", (2005)",
"title": "Quantum Key Distribution in a Multi-User Network at Gigahertz Clock rates",
"url": "https://arxiv.org/abs/quant-ph/0605052"
},
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