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We introduce a novel time-frequency quantum key distribution (TFQKD) schemebased on photon pairs entangled in these two conjugate degrees of freedom. Thescheme uses spectral detection and phase modulation to enable measurements inthe temporal basis by means of time-to-frequency conversion. This allowslarge-alphabet encoding to be implemented with realistic components. A generalsecurity analysis for TFQKD with binned measurements reveals a close connectionwith finite-dimensional QKD protocols and enables analysis of the effects ofdark counts on the secure key size.

Large-Alphabet Time-Frequency Entangled Quantum Key Distribution by means of Time-to-Frequency Conversion