Two-way quantum cryptography at different wavelengths

Abstract

We study the security of two-way quantum cryptography at different wavelengths of the electromagnetic spectrum, from the optical range down to the microwave range. In particular, we consider a two-way quantum communication protocol where Gaussian-modulated thermal states are subject to random Gaussian displacements and finally homodyned. We show how its security threshold (in reverse reconciliation) is extremely robust with respect to the preparation noise and able to outperform the security thresholds of one-way protocols at any wavelength. As a result, improved security distances are now accessible for implementing quantum key distribution at the very challenging regime of infrared frequencies.

8 pages, 6 figures

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• Distributing Secret Keys with Quantum Continuous Variables: Principle, Security and Implementations
• Continuous-variable QKD over 50km commercial fiber
• Convex resource theory of non-Gaussianity
• Quantum discord as a resource for quantum cryptography
• Satellite-Based Continuous-Variable Quantum Communications: State-of-the-Art and a Predictive Outlook
• Theory of channel simulation and bounds for private communication
• Trusted Noise in Continuous-Variable Quantum Key Distribution: a Threat and a Defense
• Continuous-variable measurement-device-independent quantum key distribution using squeezed states
• Finite size analysis of measurement device independent quantum cryptography with continuous variables
• Continuous-variable quantum cryptography with an untrusted relay: Detailed security analysis of the symmetric configuration
• Continuous-Variable Quantum Key Distribution with Rateless Reconciliation Protocol
• Terahertz Quantum Cryptography
• Continuous-variable quantum key distribution in fast fading channels
• Continuous-variable quantum cryptography with discrete alphabets: Composable security under collective Gaussian attacks
• General immunity and superadditivity of two-way Gaussian quantum cryptography
• Two-way Gaussian quantum cryptography against coherent attacks in direct reconciliation
• Modular network for high-rate quantum conferencing
• Noiseless Linear Amplifiers in Entanglement-Based Continuous-Variable Quantum Key Distribution
• Composable security of two-way continuous-variable quantum key distribution without active symmetrization
• Two-way covert quantum communication in the microwave regime
• Semi-Quantum Key Distribution with High Quantum Noise Tolerance
• Additive Classical Capacity of Quantum Channels Assisted by Noisy Entanglement
• Floodlight Quantum Key Distribution: Demonstrating a New Framework for High-Rate Secure Communication
• Gaussian one-way thermal quantum cryptography with finite-size effects
• Secret key capacity of the thermal-loss channel: Improving the lower bound
• Continuous-variable quantum communication
• Continuous Variable Quantum Key Distribution with a Noisy Laser
• Security-proof framework for two-way Gaussian quantum-key-distribution protocols
• Gaussian two-mode attacks in one-way quantum cryptography
• Numerical simulation of the optimal two-mode attacks for two-way continuous-variable quantum cryptography in reverse reconciliation
• Quantum Entanglement Distribution in Next-Generation Wireless Communication Systems
• An Overview of CV-MDI-QKD
• Improving the lower bound to the secret-key capacity of the thermal amplifier channel
• Quantum cryptography with an ideal local relay
• CV QKD with discretized modulations in the strong noise regime
• Discord, quantum knowledge and private communications
• CV-MDI-QKD: One-mode Gaussian attacks are not enough
• Continuous-Variable Quantum Key Distribution with Composable Security and Tight Error Correction Bound towards Constrained-Device Implementations