Implementation of polarization-coded free-space BB84 quantum key distribution
SCIE
SCOPUS
- Title
- Implementation of polarization-coded free-space BB84 quantum key distribution
- Authors
- Kim, YS; Jeong, YC; Kim, YH
- Date Issued
- 2008-06
- Publisher
- MAIK NAUKA/INTERPERIODICA/SPRINGER
- Abstract
- We report on the implementation of a Bennett-Brassard 1984 quantum key distribution protocol over a free-space optical path on an optical table. Attenuated laser pulses and Pockels cells driven by a pseudorandom number generator are employed to prepare polarization-encoded photons. The sifted key generation rate of 23.6 kbits per second and the quantum bit error rate (QBER) of 3% have been demonstrated at the average photon number per pulse mu = 0.16. This QBER is sufficiently low to extract final secret keys from shared sifted keys via error correction and privacy amplification. We also tested the long-distance capability of our system by adding optical losses to the quantum channel and found that the QBER remains the same regardless of the loss.
- Keywords
- 2 NONORTHOGONAL STATES; TELECOM FIBER; CRYPTOGRAPHY; DAYLIGHT; SECURITY; LONG
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/22714
- DOI
- 10.1134/S1054660X08060212
- ISSN
- 1054-660X
- Article Type
- Article
- Citation
- LASER PHYSICS, vol. 18, no. 6, page. 810 - 814, 2008-06
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