Entangled Quantum Key Distribution Over Two Free-Space Optical Links
arXiv:0807.2289 · doi:10.1364/OE.16.016840
Abstract
We report on the first real-time implementation of a quantum key distribution (QKD) system using entangled photon pairs that are sent over two free-space optical telescope links. The entangled photon pairs are produced with a type-II spontaneous parametric down-conversion source placed in a central, potentially untrusted, location. The two free-space links cover a distance of 435 m and 1,325 m respectively, producing a total separation of 1,575 m. The system relies on passive polarization analysis units, GPS timing receivers for synchronization, and custom written software to perform the complete QKD protocol including error correction and privacy amplification. Over 6.5 hours during the night, we observed an average raw key generation rate of 565 bits/s, an average quantum bit error rate (QBER) of 4.92%, and an average secure key generation rate of 85 bits/s.
v2: Revised paper based on referee report, primarily in the Security assumption section and towards the end of the Experimental implementation section. 14 pages, 5 figures, higher resolution images will be available in the published article. v1: 13 pages, 5 figures, higher resolution images will be available in the published article
References in corpus (5)
- Free-Space distribution of entanglement and single photons over 144 km
- Quantum key distribution with entangled photon sources
- Free-space quantum key distribution with entangled photons
- Experimental Decoy State Quantum Key Distribution with Unconditional Security Incorporating Finite Statistics
- Security of entanglement-based quantum key distribution with practical detectors
Cited by in corpus (37)
- The Security of Practical Quantum Key Distribution
- Controlling passively-quenched single photon detectors by bright light
- Satellite-Based Continuous-Variable Quantum Communications: State-of-the-Art and a Predictive Outlook
- Daylight operation of a free space, entanglement-based quantum key distribution system
- Security loophole in free-space quantum key distribution due to spatial-mode detector-efficiency mismatch
- Feasibility of 300 km Quantum Key Distribution with Entangled States
- Feasibility of free space quantum key distribution with coherent polarization states
- Simple Quantum Key Distribution with qubit-based synchronization and a self-compensating polarization encoder
- Fully automated entanglement-based quantum cryptography system for telecom fiber networks
- Studying Free-Space Transmission Statistics and Improving Free-Space QKD in the Turbulent Atmosphere
- Clock synchronization by remote detection of correlated photon pairs
- Continuous-Variable Quantum Key Distribution with Entanglement in the Middle
- An Experimental Implementation of Oblivious Transfer in the Noisy Storage Model
- Controlling an actively-quenched single photon detector with bright light
- Strategies for achieving high key rates in satellite-based QKD
- Towards metropolitan free-space quantum networks
- Experimental quantum cryptography scheme based on orthogonal states
- Entanglement-based quantum key distribution with biased basis choice via free space
- Eavesdropper's ability to attack a free-space quantum-key-distribution receiver in atmospheric turbulence
- Low loss QKD optical scheme for fast polarization encoding
- Demonstrating 24-hour continuous vertical monitoring of atmospheric optical turbulence
- qkdSim: An experimenter's simulation toolkit for QKD with imperfections, and its performance analysis with a demonstration of the B92 protocol using heralded photon
- Trusted Node QKD at an Electrical Utility
- Entangled Quantum Key Distribution with a Biased Basis Choice
- CV-QKD with Gaussian and non-Gaussian Entangled States over Satellite-based Channels
- Generation of entanglement in systems of intercoupled qubits
- Using Cascade in Quantum Key Distribution
- Quantum entanglement distribution with 810 nm photons through telecom fibers
- Analysis for satellite-based high-dimensional extended B92 and high-dimensional BB84 quantum key distribution
- Optimal pair generation rate for Entanglement-based QKD
- Quantum Key Distribution over Combined Atmospheric Fading Channels
- Quantum entanglement distribution with 810 nm photons through active telecommunication fibers
- Clock offset recovery with sublinear complexity enables synchronization on low-level hardware for quantum key distribution
- Estimating the link budget of satellite-based Quantum Key Distribution (QKD) for uplink transmission through the atmosphere
- Chromatic effects in beam wander correction for free-space quantum communications
- Practical random number generation protocol for entanglement-based quantum key distribution
- Active polarization control for quantum communication in long-distance optical fibers with shared telecom traffic