Quantum key distribution using gaussian-modulated coherent states
arXiv:quant-ph/0312016 · doi:10.1038/nature01289
Abstract
Quantum continuous variables are being explored as an alternative means to implement quantum key distribution, which is usually based on single photon counting. The former approach is potentially advantageous because it should enable higher key distribution rates. Here we propose and experimentally demonstrate a quantum key distribution protocol based on the transmission of gaussian-modulated coherent states (consisting of laser pulses containing a few hundred photons) and shot-noise-limited homodyne detection; squeezed or entangled beams are not required. Complete secret key extraction is achieved using a reverse reconciliation technique followed by privacy amplification. The reverse reconciliation technique is in principle secure for any value of the line transmission, against gaussian individual attacks based on entanglement and quantum memories. Our table-top experiment yields a net key transmission rate of about 1.7 megabits per second for a loss-free line, and 75 kilobits per second for a line with losses of 3.1 dB. We anticipate that the scheme should remain effective for lines with higher losses, particularly because the present limitations are essentially technical, so that significant margin for improvement is available on both the hardware and software.
8 pages, 4 figures
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- Protecting coherence from the environment via Stark many-body localization in a Quantum-Dot Simulator
- Resource distillation in convex Gaussian resource theories
- Getting Information on Independently Prepared Quantum States -- When Are Individual Measurements as Powerful as Joint Measurements?
- Secure Multi-Party Quantum Conference and Xor Computation
- Nonclassical resource for continuous variable telecloning with non-Gaussian advantage
- Lightweight Mediated Semi-Quantum Key Distribution Protocol with a Dishonest Third Party based on Bell States
- Quantum Information with Continuous Variable systems
- Structure of the Phase in Pure Two-Mode Gaussian States
- Improving Continuous-variable Quantum Channels with Unitary Averaging
- Coherent States of Systems with Pure Continuous Energy Spectra
- Comment on 'Improving the security of protocols of quantum key agreement solely using Bell states and Bell measurement'
- Detector noise in continuous-variable quantum key distribution
- Continuous-variable Quantum Position Verification secure against entangled attackers
- Joint system quantum descriptions arising from local quantumness
- Enhanced continuous-variable quantum key distribution protocol via adaptive signal processing
- Entanglement properties of superconducting qubits coupled to a semi-infinite transmission line
- Non-Gaussian entanglement criteria for atomic homodyne detection
- Classicalization of Quantum State of Detector by Amplification Process
- Quantum Key Distribution without sending a Quantum Signal
- Quantum Discrimination of Two Noisy Displaced Number States
- Hidden quantum correlations in cavity-based quantum optics
- Tightening the eavesdropping accessible information for continuous variable quantum key distribution protocols that involve non-maximally entanglement
- Experimental study of continuous variable quantum key distribution
- Introduction to quantum information theory and outline of two applications to physics: the black hole information paradox and the renormalization group information flow
- Quantum Key Distribution with Imperfections: Recent Advances in Security Proofs
- Continuous-Variable Quantum Key Distribution with a Real Local Oscillator and without Auxiliary Signals
- Mediated Asymmetric Semi-Quantum Key Distribution
- Hybrid classical-quantum communication networks
- Information-theoretically Secret Key Generation for Fading Wireless Channels
- Systematic Numerical Study of the Propagation of Monochromatic Radiation through a Stationary Atmosphere in a Model of Plane Plane-Parallel Layers
- Polarization agnostic continuous variable quantum key distribution
- No real advantage of photon subtraction and displacement in continuous variable measurement device independent quantum key distribution
- Quantum key distribution with displaced thermal states
- Generation and Manipulation of Entanglement in Quantum Optical Systems
- A Generalized Euler Probability Distribution
- Dealing with ignorance: universal discrimination, learning and quantum correlations
- Sequential information theoretic protocols in continuous variable systems
- High Efficiency Postprocessing for Continuous-variable Quantum Key Distribution: Using All Raw Keys for Parameter Estimation and Key Extraction
- Addressable optical key distribution for unconditionally secured cryptography using phase-controlled quantum superposition
- Practical high-dimensional quantum key distribution with decoy states
- Optimally Displaced Threshold Detection for Discriminating Binary Coherent States Using Imperfect Devices
- Binary Homodyne Detection for Observing Quadrature Squeezing in Satellite Links
- Interplay between Quantumness, Randomness, and Selftesting
- Position representation of single-mode Gaussian channels beyond the Gaussian functional form
- From Quantum Optics to Quantum Technologies
- Double C-NOT attack on a single-state semi-quantum key distribution protocol and its improvement
- Robust entanglement detection in arbitrary two-mode Gaussian state: a Stokes-like operator-based approach
- Software-enhanced simultaneous quantum-classical communication protocol with Gaussian post-selection
- Experimental implementation of non-Gaussian attacks on a continuous-variable quantum key distribution system
- Scalable protocol to coherence estimation from scarce data: Theory and experiment
- Some aspects of the interplay between bipartite correlations and quantum channels
- High Efficient Secret Key Distillation for Long Distance Continuous Variable Quantum Key Distribution
- Channel Independent Cryptographic Key Distribution
- Quantum Modelling of Electro-Optic Modulators