Spectrally-Shaped Continuous-Variable QKD Operating at 500 MHz Over an Optical Pipe Lit by 11 DWDM Channels

Milovančev, Dinka; Vokić, Nemanja; Laudenbach, Fabian; Pacher, Christoph; Hübel, Hannes; Schrenk, Bernhard

doi:10.1364/ofc.2020.t3d.4

Cited by 6 publications

(7 citation statements)

References 3 publications

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“…So, the laser intensity noise and laser phase noise can be effectively controlled based on Eqs. ( 16) and (22). Moreover, two BHDs' output signals are collected and digitized by a high speed oscilloscope (Keysight DSOV084A) for the subsequent digital signal processing (DSP) and post-processing.…”

Section: Resultsmentioning

confidence: 99%

“…( 15) that the last term Phase represents the dominate phase noise in excess noise. In LLO-CVQKD scenario, the phase noise is divided into two parts, given by , , Phase phase fast phase slow      (22) where the fast-drift phase noise εphase,fast is originated from the relative phase drift between two independent lasers, determined by εphase,fast=2πVA(ΔA+ΔB)/Rsym. So, two independent laser linewidths ΔA and ΔB should be chosen to be small as much as possible in experiment.…”

Section: Excess Noise Model Of Four-state Llo-cvqkd Setupmentioning

confidence: 99%

“…However, high repetition rate GMCS CVQKD depends deeply on large broadband linear modulation and coherent detection, which potentially limits the SKR. As a comparison, the DMCS CVQKD, such as four-state protocol, has more practical advantages of working at low signal to noise ratio (SNR) and large operating bandwidth, which can potentially improve the SKR significantly [20][21][22]. Currently, high-speed DMCS CVQKD has been extensively researched by combining the local local oscillator (LLO) scheme which is free from the security loopholes and the intensity bottleneck of the transmitting LO [23][24][25].…”

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confidence: 99%

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Sub-Gbps Key Rate Four-State Continuous-Variable Quantum Key Distribution within Metropolitan Area

Wang

et al. 2021

Preprint

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Continuous-variable quantum key distribution (CVQKD) has potential advantages of high secret key rate, which is very suitable for high-speed metropolitan network application. However, the reported highest secret key rates of the CVQKD systems up to now are limited in a few Mbps. Here, we address the fundamental experimental problems and demonstrate a single-carrier four-state CVQKD with sub-Gbps key rate within metropolitan area. In the demonstrated four-state CVQKD using local local oscillator, an ultra-low level of excess noise is obtained and a high efficient post-processing setup is designed for practically extracting the final secure keys. Thus, the achieved secure key rates are 190.54 Mbps and 137.76 Mbps and 52.48 Mbps using linear channel assuming security analysis method and 233.87 Mbps, 133.6 Mbps and 21.53 Mbps using semidefinite programming security analysis method over transmission distances of 5 km, 10 km and 25 km, respectively. This record-breaking result increases the previous secret key rate record by an order of magnitude, which is sufficient to achieve the one-time pad cryptographic task. Our work shows the road for future high-rate and large-scale CVQKD deployment in secure broadband metropolitan and access networks.

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Section: Resultsmentioning

confidence: 99%

Section: Excess Noise Model Of Four-state Llo-cvqkd Setupmentioning

confidence: 99%

mentioning

confidence: 99%

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Sub-Gbps Key Rate Four-State Continuous-Variable Quantum Key Distribution within Metropolitan Area

Wang

et al. 2021

Preprint

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“…Table II compares the obtained results for various CV-QKD systems. The highest transmitted symbol rates are obtained for CV-QKD systems employing continuous training information multiplexed in frequency and quantum heterodyne detection in the baseband, coherent intradyne reception [38,[40][41][42].…”

Section: A the State-of-the-art In Cv-qkdmentioning

confidence: 99%

“…Concepts employing a receiver-side LO [31][32][33][34][35][36][37][38][39][40][41][42][43][44], as it is commonly seen in telecom-based coherent transceivers, have gained significant attention during recent years. Challenges such as the optical carrier synchronization of now independent optical sources at transmitter and receiver have been solved through incorporation of auxiliary training information and powerful signal processing resources.…”

Section: A the State-of-the-art In Cv-qkdmentioning

confidence: 99%

High Rate CV-QKD Secured Mobile WDM Fronthaul for Dense 5G Radio Networks

Milovančev

Vokić

Laudenbach

et al. 2021

J. Lightwave Technol.

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A coherent transmission methodology for a continuous-variable quantum key distribution (CV-QKD) system based on quantum-heterodyne measurement through a coherent intradyne receiver is experimentally demonstrated in the framework of 5G mobile fronthaul links. Continuous optical carrier synchronization is obtained through training information, which is multiplexing to the quantum signal as pilot tone in both, frequency and polarization. Spectral tailoring by means of optical carrier suppression and single-sideband modulation is adopted to simultaneously mitigate crosstalk into the quantum channel and self-interference for the pilot tone, thus allowing for a high signalto-noise ratio for this training signal. Frequency offset correction and optical phase estimation for the free-running local oscillator of the receiver is accurately performed and guarantees low-noise quantum signal reception at high symbol rates of 250 MHz and 500 MHz with additional Nyquist pulse shaping. A low excess noise in the order of 0.1% to 0.5% of shot-noise units is obtained for fiber-based transmission over a fronthaul link reach of 13.2 km. Moreover, co-existence with 11 carrier-grade classical signals is experimentally investigated. Joint signal transmission in the C-band of both, quantum signal and classical signals, is successfully demonstrated. Secure-key rates of 18 and 10 Mb/s are obtained under strict security assumptions, where Eve has control of the receiver noise, for a dark and a lit fiber link, respectively. Moreover, rates of 85 and 72 Mb/s are resulting for a trusted receiver scenario. These secure-key rates are well addressing the requirements for time-shared CV-QKD system in densified 5G radio access networks with cloud-based processing.

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Quantum Key Distribution with Continuous-Variable Systems

Matsuura

2023

Springer Theses

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Spectrally-Shaped Continuous-Variable QKD Operating at 500 MHz Over an Optical Pipe Lit by 11 DWDM Channels

Abstract: We demonstrate high-rate CV-QKD supporting a secure-key rate of 22Mb/s through spectral tailoring and optimal use of quantum receiver bandwidth. Co-existence with 11 adjacent carrier-grade C-band channels spaced by only 20nm is accomplished at >10Mb/s.

Cited by 6 publications

References 3 publications

Sub-Gbps Key Rate Four-State Continuous-Variable Quantum Key Distribution within Metropolitan Area

Sub-Gbps Key Rate Four-State Continuous-Variable Quantum Key Distribution within Metropolitan Area

High Rate CV-QKD Secured Mobile WDM Fronthaul for Dense 5G Radio Networks

Quantum Key Distribution with Continuous-Variable Systems

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