Abstract
In this paper, we investigate a terrestrial relay-assisted scheme for
a free-space quantum key distribution (QKD) system based on BB84 protocol.
We consider the deployment of passive relays which simply redirect the qubits
to the next relay node or to the receiver without performing any measurement
or detection process. Based on a near-field analysis, we derive an upper bound
on quantum bit error rate (QBER) of the relay-assisted QKD system. Our results
demonstrate that the relay-assisted scheme is able to outperform point-to-point
direct transmission for long link ranges in which turbulence effects are particularly
degrading.
© 2009 IEEE
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