A research contribution focusing on the Quantum Key Distribution (QKD)-enabled solutions assisting in security framework of an optical 5G fronthaul segment is presented. We thoroughly investigate integration a BB84-QKD link, operating at telecom band, delivering quantum keys for Advanced Encryption Standard (AES)-256 encryption engines packetized layer interconnecting multiple terminal nodes. Secure Rate calculations are studied both dedicated and shared fiber configurations to identify...

Quantum key distribution (QKD) has gained a lot of attention over the past few years, but implementation quantum security applications is still challenging to accomplish with current technology. Towards global-scale quantum-secured network, satellite communications seem be promising candidate successfully support communication infrastructure (QCI) by delivering keys optical ground terminals. In this research, we examined feasibility satellite-to-ground QKD under daylight and nighttime...

We present a real-world Gigabit Passive Optical Network (GPON)-based Fiber to the Home (FTTH) network serving up 32 users, installed in COSMOTE laboratories Athens. The deployment relies on use of fiber optics and GPON telecom equipment which are identical those found currently deployed FTTH infrastructure. describe real-life designs that correspond specific installations considered Athens urban metropolitan area. propose practical upstream Quantum Access (QAN) over network, relied...

In this paper, a coexistence scheme between Discrete-Variable Quantum Key Distribution (DV-QKD) and four bidirectional classical channels in Passive Optical Network (PON) topology is theoretically investigated. The study aims to explore the imposed limitations considering of weak quantum with realistic traffic flows streams through shared fiber infrastructures. Based on `plug play' phase coding DV-QKD implementation, we conducted numerical simulations QBER secure key rate for distances up 10...

In this study a feasibility analysis of satellite-to-ground QKD link employing the Decoy-State BB84 protocol for both LEO and MEO satellite constellations is presented. Considering realistic atmospheric conditions system assumptions, comparison performance between low medium orbits over an existing OGS network reported.

A research contribution focusing on the feasibility of Decoy State BB84 Quantum Key Distribution (QKD) protocol over a free-space optical (FSO) link under strong and moderate solar radiance in urban environment Athens city, Greece for short distances up to 1km is presented. Emphasis placed time varying attenuation which introduced by various atmospheric processes especially effect turbulence. We examine how these factors affect performance FSO conducting numerical simulations Secure Rate...

As Quantum Key Distribution (QKD) seems to turn towards satellite communication infrastructure interconnect distant nodes aiming a global quantum secured network, the number of assisting satellites is expected increase. In this work, feasibility analysis large-scale Low Earth Orbit (LEO) constellation supporting LEO ground QKD links presented. A software tool simulate physical properties and link budget calculator tailored for have been developed. with 100 orbiting at 550km altitude 53deg...

For enabling and realizing long-haul Quantum Key Distribution (QKD), satellite communication infrastructure is exploited to deliver symmetric encryption keys ground segments. In this direction the European Communication Infrastructure (Euro-QCI) initiative, supported by Space Agency (ESA), aims build a secure quantum network that will span across EU. framework, ESA has selected three observatories in Greece support activities optical communications QKD systems. study, feasibility analysis...

A quantum-secured packetized optical fronthaul segment is thoroughly discussed. We present an extensive study on the integration of a Discrete Variable-Quantum Key Distribution (DV-QKD) link supporting Advanced Encryption Standard-256 (AES-256) encryption operating at 10Gbps. Secure key rates exceeding 1Kbps and short rotation times down to 1.4s are reported for Point-to-Point (P2P) topologies by considering latency budget 5G connectivity. For multi-user environment, Bob stations...

Coexistence of weak coherent pulses and intense light is experimentally demonstrated in a practical 5G X-haul scenario. Acceptable QBER measurements were obtained over 5 km fiber transmission by optimizing the parameters single-photon sender/receiver stations.

We have successfully demonstrated the integration of a commercial O-band Quantum Key Distribution (QKD) system over testbed that replicates carrier-grade Fiber-to-the-Home (FTTH) optical access network consisting components and systems installed in real-life FTTH operational deployments. The experiment QKD transmission 1:16 user Gigabit Optical Passive Network (GPON) configuration at premises Telecom Operator COSMOTE followed operator’s standard divided two splitting stages. architecture we...

We have successfully demonstrated the integration of a commercial O-band Quantum Key Distribution (QKD) system over testbed that replicates carrier-grade Fiber-to-the-Home (FTTH) optical access network consisting components and systems installed in real-life FTTH operational deployments. The experiment QKD transmission 1:16 user Gigabit Optical Passive Network (GPON) configuration at premises Telecom Operator COSMOTE followed operator’s standard divided two splitting stages. architecture we...

We have successfully demonstrated the integration of a commercial O-band Quantum Key Distribution (QKD) system over testbed that replicates carrier-grade Fiber-to-the-Home (FTTH) optical access network consisting components and systems installed in real-life FTTH operational deployments. The experiment QKD transmission 1:16 user Gigabit Optical Passive Network (GPON) configuration featuring total 9 Terminals (ONTs) at premises Telecom Operator COSMOTE followed operator's standard divided two...

The ever-increasing quantum computational power may pose a serious threat to classical Public Key Exchange (PKE) algorithms in the next few years. need for resilient key exchange schemes is becoming more topical as computers become powerful. Quantum Distribution (QKD) promises unconditionally secure distribution between two remote parties. distilled keys of QKD link can be used by symmetric such Advanced Encryption Standard (AES). Unfortunately, has come across some major limitations...

We present a practical quantum/classical multiplexing scheme in mobile x-haul optical transport segment deployed fiber pair. Photon counting measurements are reported, based on which performance evaluation of the COW-QKD protocol is presented and secret key distillation rate at 1.43 kbps calculated.

A novel transmitter implementation, which will be capable of operating in both classical and quantum light regimes since it able to send single photons across a channel at the same time serve as analog RoF currently deployed X-haul topologies, is proposed. By spectrally isolating sidebands signal by controlling EML's modulation index, different mean photon numbers launched one sideband can obtained. We report on architecture our proposed station, we demonstrate its operation through...

We introduce the concept of GTE-assisted double-pass MZI and its operation using photon number states, based on quantum-optical formalism. also theoretically show impressive interferometric fringes for different combinations N-photon states as circuit inputs.

There is considerable interest in predicting the efficiency of Quantum Key Distribution (QKD) protocols when one their implementation quantities modified. One significant imperfection that affects setup afterpulse phenomenon which consists spontaneous detections triggered by trapped carriers after previous avalanches at detectors. While it widely studied bibliography for various QKD protocols, has been reported much more scarcely well-known decoy-state and dual detectors only. We develop a...

Addressing spectrum related parameters of filtering nodes can assist in enhanced monitoring WDM-enabled networking. We introduce methods to assess the impact LCoS-based WSS node impairments based on QBER/SKR metrics from QKD stations.