Abstract

Quantum key distribution is the most advanced technology in the field of quantum information processing. Conventional implementations utilize discrete variable systems to realize the secure information transfer. However, in these setups the achievable data transmission rates are limited. A new development employs continuous variable systems [1], such as bright light fields, to obtain shorter key distribution times. Our scheme for a continuous variable system makes use of an easy to handle source of EPR-entanglement. In contrast to other continuous variable schemes we do not use predetermined bit values. Thus, the key generation process resembles the Ekert protocol which has proven to be successful for dichotomic variables.

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