Witnessing effective entanglement in a continuous variable prepare&measure setup and application to a QKD scheme using postselection
arXiv:quant-ph/0603271 · doi:10.1103/PhysRevA.74.042326
Abstract
We report an experimental demonstration of effective entanglement in a prepare&measure type of quantum key distribution protocol. Coherent polarization states and heterodyne measurement to characterize the transmitted quantum states are used, thus enabling us to reconstruct directly their Q-function. By evaluating the excess noise of the states, we experimentally demonstrate that they fulfill a non-separability criterion previously presented by Rigas et al. [J. Rigas, O. Gühne, N. Lütkenhaus, Phys. Rev. A 73, 012341 (2006)]. For a restricted eavesdropping scenario we predict key rates using postselection of the heterodyne measurement results.
12 pages, 12 figures, 2 tables
References in corpus (18)
- Quantum Cryptography
- Separability Criterion for Density Matrices
- Simple Proof of Security of the BB84 Quantum Key Distribution Protocol
- Quantum key distribution using gaussian-modulated coherent states
- Distillation of secret key and entanglement from quantum states
- Quantum Cryptography without Switching
- Continuous Variable Quantum Cryptography - beating the 3 dB loss limit
- Quantum State Disturbance vs. Information Gain: Uncertainty Relations for Quantum Information
- Entanglement as precondition for secure quantum key distribution
- Polarization squeezing and continuous-variable polarization entanglement
- No-Switching Quantum Key Distribution using Broadband Modulated Coherent Light
- Quantum cryptography using balanced homodyne detection
- Unconditional security of coherent-state quantum key distribution with strong phase-reference pulse
- Efficiency of coherent state quantum cryptography in the presence of loss: Influence of realistic error correction
- Security of quantum cryptography using balanced homodyne detection
- Entanglement verification for quantum key distribution systems with an underlying bipartite qubit-mode structure
- Quantum correlations and secret bits
- Detecting two-party quantum correlations in quantum key distribution protocols
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