Practical high-dimensional quantum key distribution with decoy states

Abstract

High-dimensional quantum key distribution (HD-QKD) allows two parties to generate multiple secure bits of information per detected photon. In this work, we show that decoy state protocols can be practically implemented for HD-QKD using only one or two decoy states. HD-QKD with two decoy states, under realistic experimental constraints, can generate multiple secure bits per coincidence at distances over 200 km and at rates similar to those achieved by a protocol with infinite decoy states. Furthermore, HD-QKD with only one decoy state is practical at short distances, where it is almost as secure as a protocol with two decoy states. HD-QKD with only one or two decoy states can therefore be implemented to optimize the rate of secure quantum communications.

11 pages, 3 figures

References in corpus (10)

• Distillation of secret key and entanglement from quantum states
• Unconditional optimality of Gaussian attacks against continuous-variable QKD
• Optimality of Gaussian Attacks in Continuous Variable Quantum Cryptography
• Long distance decoy state quantum key distribution in optical fiber
• On Secure Quantum Key Distribution Using Continuous Variables of Single Photons
• Quantum key distribution with triggering parametric down conversion sources
• Single photon continuous variable quantum key distribution based on energy-time uncertainty relation
• Passive sources for the Bennett-Brassard 1984 quantum key distribution protocol with practical signals
• Experimental Passive Decoy-State Quantum Key Distribution
• Passive scheme with a photon-number-resolving detector for monitoring the untrusted source in a plug-and-play quantum-key-distribution system