Digital synchronization for continuous-variable quantum key distribution

Chin, Hou-Man; Jain, Nitin; Andersen, Ulrik L.; Zibar, Darko; Gehring, Tobias

doi:10.1088/2058-9565/ac7ba2

Cited by 10 publications

(3 citation statements)

References 62 publications

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“…Due to finite OSSB 29 , a suppressed pilot tone is also visible; the corresponding suppressed quantum band was however outside the receiver bandwidth (we used a low pass filter with a cutoff frequency around 360 MHz at the output of the homemade heterodyne detector 30 ). As shown, the Tx and Rx had their clocks synchronized, and the Tx provided a trigger for data acquisition in Rx 34 , 35 .…”

Section: Resultsmentioning

confidence: 99%

Practical continuous-variable quantum key distribution with composable security

et al. 2022

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A quantum key distribution (QKD) system must fulfill the requirement of universal composability to ensure that any cryptographic application (using the QKD system) is also secure. Furthermore, the theoretical proof responsible for security analysis and key generation should cater to the number N of the distributed quantum states being finite in practice. Continuous-variable (CV) QKD based on coherent states, despite being a suitable candidate for integration in the telecom infrastructure, has so far been unable to demonstrate composability as existing proofs require a rather large N for successful key generation. Here we report a Gaussian-modulated coherent state CVQKD system that is able to overcome these challenges and can generate composable keys secure against collective attacks with N ≈ 2 × 108 coherent states. With this advance, possible due to improvements to the security proof and a fast, yet low-noise and highly stable system operation, CVQKD implementations take a significant step towards their discrete-variable counterparts in practicality, performance, and security.

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Section: Resultsmentioning

confidence: 99%

Practical continuous-variable quantum key distribution with composable security

et al. 2022

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“…5,15,16 However, the practical implementation and testing of QKD protocols in real-world scenarios can be challenging due to various factors: various noise sources, 17 imperfections of the devices, 18,19 or the necessity of additional signal processing, such as phase recovery or time synchronization. 20 Some of the component imperfections can be taken into consideration using analytical expressions, 21 but as the system becomes more complex, it becomes more difficult to take into account all the effects and their interactions. Furthermore, it can be hard to evaluate analytically the influence of component imperfections on the system performance.…”

Section: Introductionmentioning

confidence: 99%

Simulation and design of quantum key distribution systems

Novik

Koltchanov

Richter

et al. 2023

Photonics for Quantum 2023

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Previously, we reported a framework capable of simulating classical transmission systems and QKD based on weak-coherent prepare-and-measure protocols. The framework’s modular architecture provides a rich library of models for various system components (e.g., lasers, modulators, fibers). QKD components include singlephoton detectors, transmitter- and receiver designs, and performance estimators. For realistic system designs, component models can account for various imperfections (e.g., laser model with linewidth, RIN, side modes). Here, we present further developments of the framework and its applications. We applied our simulation tool to investigate a satellite-based BB84 system in the downlink scenario. For fiber-based applications in a coexistence scenario, we studied the usage of multicore fibers to better separate classical and quantum channels, and various PON configurations. The system performance was estimated by analyzing the QBER dependence on the classical channel power due to Raman scattering. Furthermore, we discuss the simulation results of a Gaussian-modulated CV-QKD system with a realistic model of a true local oscillator. We studied how the utilization of DSP techniques improves the system’s performance. We evaluated the secret key rate for different transmission distances.

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“…Compared with DV‐QKD, CV‐QKD demonstrates its potential to improve quantum communication performance and promote the development of the global quantum internet. [ 14,15 ] Recent research results in CV‐QKD include digital synchronization, [ 16 ] 5G radio networks, [ 17 ] optimized multithreaded, [ 18 ] on‐chip light sources, [ 19 ] multi‐core fibers, [ 20 ] etc.…”

Section: Introductionmentioning

confidence: 99%

Unidimensional Continuous Variable Quantum Key Distribution under Fast Fading Channel

Zhao,

Zhou,

Shi

et al. 2023

Annalen der Physik

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In this paper, the performance of a unidimensional continuous variable quantum key distribution protocol is analyzed using Gaussian modulated coherent state under fast fading channel. In the fast fading channel, both parties are connected in free space, resulting in a harsh propagation environment and pollution caused by atmospheric turbulence. This pollution makes it difficult for the communicators to determine the channel transmittance, which can only be estimated based on a probability distribution. To address this, only one modulator is used to code, which demonstrates performance equivalent to that of the symmetric modulated Gaussian coherent state protocol. The security of the protocol in the face of collective attacks is analyzed and it is proved that it can accept a certain amount of excessive channel noise while simplifying operations. Simultaneously, the impact of finite‐key length effects on the protocol is analyzed. It is also demonstrated that this protocol can reduce costs within an acceptable range of performance losses, making it more practical.

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Digital synchronization for continuous-variable quantum key distribution

Cited by 10 publications

References 62 publications

Practical continuous-variable quantum key distribution with composable security

Practical continuous-variable quantum key distribution with composable security

Simulation and design of quantum key distribution systems

Unidimensional Continuous Variable Quantum Key Distribution under Fast Fading Channel

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