Simultaneous classical communication and quantum key distribution using continuous variable

Abstract

Presently, classical optical communication systems employing strong laser pulses and quantum key distribution (QKD) systems working at single-photon levels are very different communication modalities. Dedicated devices are commonly required to implement QKD. In this paper, we propose a scheme which allows classical communication and QKD to be implemented simultaneously using the same communication infrastructure. More specially, we propose a coherent communication scheme where both the bits for classical communication and the Gaussian distributed random numbers for QKD are encoded on the same weak coherent pulse, and decoded by the same coherent receiver. Simulation results based on practical system parameters show that both deterministic classical communication with a bit error rate of 10^{-9} and secure key distribution could be achieved over tens of kilometers single mode fibers. It is conceivable that in the future coherent optical communication network, QKD is operated in the background of classical communication at a minimal cost.

7 pages, 5 figures. Comments are welcome!

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• Noise analysis of simultaneous quantum key distribution and classical communication scheme using a true local oscillator
• Quantum Network: Security Assessment and Key Management
• Experimental passive state preparation for continuous variable quantum communications
• Piggybacking on Quantum Streams
• Continuous-variable quantum key distribution field-test with true local oscillator
• Security bound of continuous-variable measurement-device-independent quantum key distribution with imperfect phase reference calibration
• Exploiting Spatial Diversity in Earth-to-Satellite Quantum-Classical Communications
• Hybrid classical-quantum communication networks
• Continuous Variable Quantum Key Distribution with Single Quadrature Measurement at Arbitrary Reference Frame
• Enhanced Simultaneous Quantum-Classical Communications Under Composable Security
• Software-enhanced simultaneous quantum-classical communication protocol with Gaussian post-selection
• Protecting Classical-Quantum Signals in Free Space Optical Channels