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

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.

4 pages, 5 figures. Replaced with published version

References in corpus (6)

• Quantum Cryptography
• Security of quantum key distribution using d-level systems
• Quantum Cryptography using larger alphabets
• Generation of maximally entangled states of qudits using twin photons
• Qutrit state engineering with biphotons
• Demonstration of the Complementarity of One- and Two-Photon Interference

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