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Quantum key distribution with higher-order alphabets using spatially-encoded qudits
Preprint
2005-10-12
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Abstract
We propose and demonstrate a quantum key distribution scheme in higher-order \(d\)-dimensional
alphabets using spatial degrees of freedom of photons. Our implementation allows for
the transmission of 4.56 bits per sifted photon, while providing improved security:
an intercept-resend attack on all photons would induce an error rate of 0.47. Using
our system, it should be possible to send more than a byte of information per sifted
photon.