Journal
PHYSICAL REVIEW A
Volume 87, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.87.062322
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Funding
- DARPA Information in a Photon program from the Army Research Office [W911NF-10-1-0416]
- Sloan Research Fellowship
- Columbia Optics and Quantum Electronics IGERT under NSF [DGE-1069420]
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We propose a high-dimensional quantum key distribution (QKD) protocol that employs temporal correlations of entangled photons. The security of the protocol relies on measurements by Alice and Bob in one of two conjugate bases, implemented using dispersive optics. We show that this dispersion-based approach is secure against collective attacks. The protocol, which represents a QKD analog of pulse position modulation, is compatible with standard fiber telecommunications channels and wavelength division multiplexers. We describe several physical implementations to enhance the transmission rate and describe a heralded qudit source that is easy to implement and enables secret-key generation at >4 bits per character of distilled key across over 200 km of fiber.
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