Free space quantum key distribution in daylight

Hughes, Victoria; Nordholt,; Morgan, Hiram; Peterson, '

doi:10.1109/qels.2002.1031406

Cited by 8 publications

(15 citation statements)

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“…Near-ground paths of several km are achievable and make it possible to provide secure communications on optical data lengths in cities and across and between corporate or government campuses. 5,6 It should also be possible to re-key satellites on orbit with QKD. 7 Satellites are extremely valuable assets requiring secure command, control, and data paths in order to protect their operations and capabilities.…”

Section: Future Free-space Qkdmentioning

confidence: 99%

<title>Present and future free-space quantum key distribution</title>

Nordholt

Hughes

Morgan

et al. 2002

Free-Space Laser Communication Technologies XIV

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Free-space quantum key distribution (QKD), more popularly know as quantum cryptography, uses single-photon freespace optical communications to distribute the secret keys required for secure communications. At Los Alamos National Laboratory we have demonstrated a fully automated system that is capable of operations at any time of day over a horizontal range of several kilometers. This has proven the technology is capable of operation from a spacecraft to the ground, opening up the possibility of QKD between any group of users anywhere on Earth. This system, the prototyping of a new system for use on a spacecraft, and the techniques required for world -wide quantum key distribution will be described. The operational parameters and performance of a system designed to operate between low earth orbit (LEO) and the ground will also be discussed.

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Section: Future Free-space Qkdmentioning

confidence: 99%

<title>Present and future free-space quantum key distribution</title>

Nordholt

Hughes

Morgan

et al. 2002

Free-Space Laser Communication Technologies XIV

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“…Also, free space communications offer some comparative advantages compared to optical fibers: first, birefringence effects that could alter the polarization state of the photons are not present. Second, the atmosphere has a high transmission window in wavelengths of ~770 nm where the most efficient photon counting detectors can be found [12,13].…”

Section: Introductionmentioning

confidence: 99%

Free Space Decoy-state Quantum Key Distribution Implementation

Magnoni¹,

Grande²,

Larotonda³

2017

Opt. Pura Apl.

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ABSTRACT:In this work we introduce a complete Quantum Key Distribution device that implements a decoy-state protocol [1]. Qubits are coded in the polarization state of weak optical pulses, produced by infrared LEDs [2]. The link between Transmission (Alice) and Reception (Bob) stages is open air, which is the preferred channel to eventually through low-orbit satellites establish quantum communications. Both terminals are placed on different rooms, separated by approximately 8 meters. In order to compensate misalignments produced by small mechanic displacements or atmospheric thermal gradients, the system implements a closed-loop for automatic alignment based on a counter-propagating laser, a servo-actuated mirror and a CMOS image sensor. The apparatus runs in an autonomous way, and in the above described conditions it is able to generate raw cryptographic key at a rate of 185 bits/s, with a QBER of 6.15%. Key words: Quantum Key Distribution; Open Air Communications; Decoy State RESUMEN:En este trabajo se presenta un sistema completo de Distribución Cuántica de Claves criptográficas, utilizando un protocolo con estados señuelo [1]. Los qubits se codifican en el estado de polarización de pulsos ópticos atenuados, producidos por LEDs infrarrojos [2]. La propagación de los mismos entre las estaciones que buscan compartir una clave se realiza en aire, que es la implementación más prometedora para cubrir grandes distancias (vıá sateĺites de baja órbita). Las terminales de emisión y recepción se encuentran en plataformas independientes y están separadas 8 metros, siendo este sistema el primero a nivel local en ser ensayado a distancias que exceden las de la mesa óptica.Para compensar eventuales desalineaciones por gradientes teŕmicos en atmósfera y pequeñas variaciones mecánicas, el sistema cuenta con un metodo de corrección de la punterıá, basado en un haz contrapropagante, un sensor de imagen CMOS y un espejo con actuadores remotos. El aparato en su conjunto funciona de forma autónoma, y en las condiciones descriptas es capaz de generar clave criptográfica cruda a una tasa de 185 bits/s, con un error de 6,15%.

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“…Quantum relaying has been also studied over FSO channels, but the current results are mainly restricted for satellite transmission [19], [20]. In [19], Hughes et al have considered a relay-assisted QKD scenario for satellite communication between two terrestrial nodes without line-of-sight path to each other.…”

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confidence: 99%

mentioning

confidence: 99%

“…In [19], Hughes et al have considered a relay-assisted QKD scenario for satellite communication between two terrestrial nodes without line-of-sight path to each other. A trusted relay in a satellite generates secure keys with the two nodes and then reveals the XOR of the two keys [19]. To support the idea, a feasibility analysis is also reported in [19] based on the estimation of key generation capability of QKD system between a ground station and a LEO satellite.…”

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confidence: 99%

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Relay-Assisted Quantum-Key Distribution Over Long Atmospheric Channels

Safari

Uysal

2009

J. Lightwave Technol.

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Abstract-In this paper, we investigate a terrestrial relay-assisted scheme for a free-space quantum key distribution (QKD) system based on BB84 protocol. We consider the deployment of passive relays which simply redirect the qubits to the next relay node or to the receiver without performing any measurement or detection process. Based on a near-field analysis, we derive an upper bound on quantum bit error rate (QBER) of the relay-assisted QKD system. Our results demonstrate that the relay-assisted scheme is able to outperform point-to-point direct transmission for long link ranges in which turbulence effects are particularly degrading.Index Terms-Free-space optics, quantum-key distribution, relay-assisted systems.

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Free space quantum key distribution in daylight

Cited by 8 publications

References 0 publications

<title>Present and future free-space quantum key distribution</title>

<title>Present and future free-space quantum key distribution</title>

Free Space Decoy-state Quantum Key Distribution Implementation

Relay-Assisted Quantum-Key Distribution Over Long Atmospheric Channels

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