Inter-Core Crosstalk Impact of Classical Channels on CV-QKD in Multicore Fiber Transmission

Eriksson, Tobias A.; Puttnam, Benjamin J.; Rademacher, Georg; Luís, Ruben S.; Takeoka, Masahiro; Awaji, Yoshinari; Sasaki, Masahide; Wada, Naoya

doi:10.1364/ofc.2019.th1j.1

Cited by 12 publications

(7 citation statements)

References 13 publications

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“…e) Co-existence experiment of CV-QKD and classical channels over an MCF. Reprinted with permission from [97].…”

Section: Resultsmentioning

confidence: 99%

“…Recently, improved classical channel data rates has been achieved over a 7-core fibre while simultaneously allocating the center core to a QKD channel [95]. Other works have also studied the use of a dedicated side-core for QKD while having neighbouring cores filled with classical data [96], the inter-core crosstalk produced from classical channels on MCFs affecting continuous variable (CV) QKD systems [97] and performed detailed modelling on SDM-QKD integration [98]. Finally, a major increase in key generation rate has been achieved by sending out parallel keys over 37 cores of a MCF, while also propagating a 10Gbit/s data stream within each core, wavelength-multiplexed with the QKD channel [99].…”

Section: Resultsmentioning

confidence: 99%

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Quantum information processing with space-division multiplexing optical fibres

2020

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The optical fibre is an essential tool for our communication infrastructure since it is the main transmission channel for optical communications. The latest major advance in optical fibre technology is spatial division multiplexing (SDM), where new fibre designs and components establish multiple co-existing data channels based on light propagation over distinct transverse optical modes. Simultaneously, there have been many recent developments in the field of quantum information processing (QIP), with novel protocols and devices in areas such as computing, communication and metrology. Here, we review recent works implementing QIP protocols with SDM optical fibres, and discuss new possibilities for manipulating quantum systems based on this technology.Quantum information processing (QIP) is a field that has seen tremendous growth over the many years since Richard Feynman's seminal talk on the use of quantum computers to simulate physical systems [1]. When information bits are encoded on individual or entangled quantum states, a gain over traditional systems can be seen for some information processing tasks. A famous example is the well-known Shor's algorithm for prime number factorisation running on a quantum computer, where an impressive reduction in resources is obtained when compared to classical algorithms [2]. Another major application of QIP is in communication security, where the fact that unknown quantum states cannot be faithfully cloned [3] is exploited to detect the presence of an eavesdropper. This concept was used as the core foundation behind quantum key distribution (QKD), a communication protocol designed to distribute random private keys among remote parties [4,5]. As the first application to showcase in practice the benefits of QIP, QKD has experienced huge development ever since [6][7][8]. QKD is part of a more general family of protocols called quantum communications (QC), which includes other schemes such as quantum teleportation and entanglement swapping [9], aiming to be the communication backbone supporting future networks of quantum computers [10].During the last decades a number of technological features were developed by the telecommunication community in order to support the continuous increase in demand for more transmission bandwidth over a communication channel. These developments have been motivated by several applications that have cropped up along the years, from the internet to social networking and high-quality on-demand video streaming. Arguably the optical fibre has played a major role in the success of the telecommunication infrastructure, mainly due to its high transparency and highbandwidth support [11]. Technologies such as wavelength division multiplexing (WDM) [12], and the erbium doped fibre amplifier (EDFA) [13,14] have been major catalysts to the extremely high capacities and ultra-long transmission distances available today. The latest technological drive towards maintaining the bandwidth growth is called spatial division multiplexing (SDM), and it consists of employi...

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“…e) Co-existence experiment of CV-QKD and classical channels over an MCF. Reprinted with permission from [97].…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Quantum information processing with space-division multiplexing optical fibres

2020

View full text Add to dashboard Cite

show abstract

“…The first one used a MCF as a direct multiplexing device: with one core acting as the quantum channel, while other cores contained classical data [15] (see also Refs. [16][17][18][19]). Later, the fact that all cores are placed in a common cladding, translating to a long multi-path conduit with intrinsic phase stability, was explored for demonstrating the feasibility of high-dimensional (HD) quantum key distribution over MCFs [20,21].…”

Section: Introductionmentioning

confidence: 99%

Multi-core fiber integrated multi-port beam splitters for quantum information processing

Cariñe

Cañas

Skrzypczyk

et al. 2020

Optica

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Multi-port beam splitters are cornerstone devices for high-dimensional quantum information tasks, which can outperform the two-dimensional ones. Nonetheless, the fabrication of such devices has proven to be challenging with progress only recently achieved with the advent of integrated photonics. Here, we report on the production of highquality N × N (with N = 4, 7) multi-port beam splitters based on a new scheme for manipulating multi-core optical fibers. By exploring their compatibility with optical fiber components, we create four-dimensional quantum systems and implement the measurement-device-independent random number generation task with a programmable four-arm interferometer operating at a 2 MHz repetition rate. Due to the high visibilities observed, we surpass the one-bit limit of binary protocols and attain 1.23 bits of certified private randomness per experimental round. Our result demonstrates that fast switching, low loss, and high optical quality for high-dimensional quantum information can be simultaneously achieved with multi-core fiber technology.

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“…Using C-band for quantum channels is beneficial for QKD since the low insertion loss can facilitate high secret key rate (SKR) and long transmission distance. There are a few modelling and demonstrations of QKD and classical communication co-existing in C-band, where different QKD protocols [8]- [12] are implemented.…”

Section: Introductionmentioning

confidence: 99%

Modeling and Minimizing Spontaneous Raman Scattering for QKD Secured DWDM Networks

Lin

Chen

2021

IEEE Commun. Lett.

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Quantum key distribution (QKD) provides information-theoretic security based on quantum mechanics. Integrating QKD with classical data traffic by using wavelength division multiplexing (WDM) techniques in a single fibre is a costefficient way to improve security in legacy infrastructure. In such a system, the main noise source to the quantum channel is spontaneous Raman scattering (SRS) caused by the classical channels. In this letter we introduce a channel allocation strategy for both quantum and classical signals to minimize the SRS noise. A use case that quantum and classical channels co-exist in a dense WDM system is investigated. The results show >26% increase of achievable transmission distance for the QKD system when implementing the introduced channel allocation strategy. Moreover, a network updating plan is proposed, which provides a guideline to light the new wavelengths for classical communications while minimizing the SRS noise to quantum channels.

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Inter-Core Crosstalk Impact of Classical Channels on CV-QKD in Multicore Fiber Transmission

Abstract: Crosstalk-induced excess noise is experimentally characterized for continuousvariable quantum key distribution, spatially multiplexed with WDM PM-16QAM channels in a 19-core fiber. The measured noise-sources are used to estimate the secret key rates for different wavelength channels.

Cited by 12 publications

References 13 publications

Quantum information processing with space-division multiplexing optical fibres

Quantum information processing with space-division multiplexing optical fibres

Multi-core fiber integrated multi-port beam splitters for quantum information processing

Modeling and Minimizing Spontaneous Raman Scattering for QKD Secured DWDM Networks

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