Quantum key distribution with higher-order alphabets using spatially-encoded qudits

Details Quantum key distribution with higher-order alphabets using spatially-encoded qudits Quantum key distribution with higher-order alphabets using spatially-encoded qudits

2005-10-12

arxiv.org/abs/quant-ph/0510088v2

Physical Review Letters, 96, 090501 (2006)

Physics

Quantum Physics

4 pages, 5 figures. Replaced with published version

Scientific paper

10.1103/PhysRevLett.96.090501

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.

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