The Experts below are selected from a list of 400695 Experts worldwide ranked by ideXlab platform
Ittoop Vergheese Puthoor - One of the best experts on this subject based on the ideXlab platform.
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Experimental Measurement device independent quantum digital signatures
Nature Communications, 2017Co-Authors: G L Roberts, Marco Lucamarini, Z L Yuan, J F Dynes, L C Comandar, A W Sharpe, A J Shields, Marcos Curty, Ittoop Vergheese PuthoorAbstract:The development of quantum networks will be paramount towards practical and secure telecommunications. These networks will need to sign and distribute information between many parties with information-theoretic security, requiring both quantum digital signatures (QDS) and quantum key distribution (QKD). Here, we introduce and Experimentally realise a quantum network architecture, where the nodes are fully connected using a minimum amount of physical links. The central node of the network can act either as a totally untrusted relay, connecting the end users via the recently introduced Measurement-device-independent (MDI)-QKD, or as a trusted recipient directly communicating with the end users via QKD. Using this network, we perform a proof-of-principle demonstration of QDS mediated by MDI-QKD. For that, we devised an efficient protocol to distil multiple signatures from the same block of data, thus reducing the statistical fluctuations in the sample and greatly enhancing the final QDS rate in the finite-size scenario.
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Experimental Measurement device independent quantum digital signatures over a metropolitan network
Physical Review A, 2017Co-Authors: Hualei Yin, Ittoop Vergheese Puthoor, Hui Liu, Weijun Zhang, Lixing You, Wei Long Wang, Yan Lin Tang, Qi Zhao, Xiang Xiang Sun, Erika AnderssonAbstract:Quantum digital signatures (QDSs) provide a means for signing electronic communications with information-theoretic security. However, all previous demonstrations of quantum digital signatures assume trusted Measurement devices. This renders them vulnerable against detector side-channel attacks, just like quantum key distribution. Here we exploit a Measurement-device-independent (MDI) quantum network, over a metropolitan area, to perform a field test of a three-party MDI QDS scheme that is secure against any detector side-channel attack. In so doing, we are able to successfully sign a binary message with a security level of about ${10}^{\ensuremath{-}7}$. Remarkably, our work demonstrates the feasibility of MDI QDSs for practical applications.
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Experimental Measurement device independent quantum digital signatures
arXiv: Quantum Physics, 2017Co-Authors: G L Roberts, Marco Lucamarini, Z L Yuan, J F Dynes, L C Comandar, A W Sharpe, A J Shields, Marcos Curty, Ittoop Vergheese PuthoorAbstract:We propose and Experimentally implement a novel reconfigurable quantum key distribution (QKD) scheme, where the users can switch in real time between conventional QKD and the recently-introduced Measurement-device-independent (MDI) QKD. Through this setup, we demonstrate the distribution of quantum keys between three remote parties connected by only two quantum channels, a previously unattempted task. Moreover, as a prominent application, we extract the first quantum digital signature (QDS) rates from a network that uses a Measurement-device-independent link. In so doing, we introduce an efficient protocol to distil multiple signatures from the same block of data, thus reducing the statistical fluctuations in the sample and increasing the final QDS rate.
G L Roberts - One of the best experts on this subject based on the ideXlab platform.
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Experimental Measurement device independent quantum digital signatures
Nature Communications, 2017Co-Authors: G L Roberts, Marco Lucamarini, Z L Yuan, J F Dynes, L C Comandar, A W Sharpe, A J Shields, Marcos Curty, Ittoop Vergheese PuthoorAbstract:The development of quantum networks will be paramount towards practical and secure telecommunications. These networks will need to sign and distribute information between many parties with information-theoretic security, requiring both quantum digital signatures (QDS) and quantum key distribution (QKD). Here, we introduce and Experimentally realise a quantum network architecture, where the nodes are fully connected using a minimum amount of physical links. The central node of the network can act either as a totally untrusted relay, connecting the end users via the recently introduced Measurement-device-independent (MDI)-QKD, or as a trusted recipient directly communicating with the end users via QKD. Using this network, we perform a proof-of-principle demonstration of QDS mediated by MDI-QKD. For that, we devised an efficient protocol to distil multiple signatures from the same block of data, thus reducing the statistical fluctuations in the sample and greatly enhancing the final QDS rate in the finite-size scenario.
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Experimental Measurement device independent quantum digital signatures
arXiv: Quantum Physics, 2017Co-Authors: G L Roberts, Marco Lucamarini, Z L Yuan, J F Dynes, L C Comandar, A W Sharpe, A J Shields, Marcos Curty, Ittoop Vergheese PuthoorAbstract:We propose and Experimentally implement a novel reconfigurable quantum key distribution (QKD) scheme, where the users can switch in real time between conventional QKD and the recently-introduced Measurement-device-independent (MDI) QKD. Through this setup, we demonstrate the distribution of quantum keys between three remote parties connected by only two quantum channels, a previously unattempted task. Moreover, as a prominent application, we extract the first quantum digital signature (QDS) rates from a network that uses a Measurement-device-independent link. In so doing, we introduce an efficient protocol to distil multiple signatures from the same block of data, thus reducing the statistical fluctuations in the sample and increasing the final QDS rate.
Qiang Zhang - One of the best experts on this subject based on the ideXlab platform.
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Experimental Measurement device independent quantum key distribution
Physical Review Letters, 2013Co-Authors: Tengyun Chen, Liujun Wang, Hao Liang, Guoliang Shentu, Jian Wang, Li Li, Jason S Pelc, M M Fejer, Chengzhi Peng, Qiang ZhangAbstract:: Quantum key distribution is proven to offer unconditional security in communication between two remote users with ideal source and detection. Unfortunately, ideal devices never exist in practice and device imperfections have become the targets of various attacks. By developing up-conversion single-photon detectors with high efficiency and low noise, we faithfully demonstrate the Measurement-device-independent quantum-key-distribution protocol, which is immune to all hacking strategies on detection. Meanwhile, we employ the decoy-state method to defend attacks on a nonideal source. By assuming a trusted source scenario, our practical system, which generates more than a 25 kbit secure key over a 50 km fiber link, serves as a stepping stone in the quest for unconditionally secure communications with realistic devices.
Tie Jun Cui - One of the best experts on this subject based on the ideXlab platform.
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wireless communications with reconfigurable intelligent surface path loss modeling and Experimental Measurement
IEEE Transactions on Wireless Communications, 2021Co-Authors: Wankai Tang, Marco Di Renzo, Jun Yan Dai, Ming Zheng Chen, Shi Jin, Qiang Cheng, Yu Han, Xiangyu Chen, Yong Zeng, Tie Jun CuiAbstract:Reconfigurable intelligent surfaces (RISs) comprised of tunable unit cells have recently drawn significant attention due to their superior capability in manipulating electromagnetic waves. In particular, RIS-assisted wireless communications have the great potential to achieve significant performance improvement and coverage enhancement in a cost-effective and energy-efficient manner, by properly programming the reflection coefficients of the unit cells of RISs. In this article, free-space path loss models for RIS-assisted wireless communications are developed for different scenarios by studying the physics and electromagnetic nature of RISs. The proposed models, which are first validated through extensive simulation results, reveal the relationships between the free-space path loss of RIS-assisted wireless communications and the distances from the transmitter/receiver to the RIS, the size of the RIS, the near-field/far-field effects of the RIS, and the radiation patterns of antennas and unit cells. In addition, three fabricated RISs (metasurfaces) are utilized to further corroborate the theoretical findings through Experimental Measurements conducted in a microwave anechoic chamber. The Measurement results match well with the modeling results, thus validating the proposed free-space path loss models for RISs, which may pave the way for further theoretical studies and practical applications in this field.
Erika Andersson - One of the best experts on this subject based on the ideXlab platform.
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Experimental Measurement device independent quantum digital signatures over a metropolitan network
Physical Review A, 2017Co-Authors: Hualei Yin, Ittoop Vergheese Puthoor, Hui Liu, Weijun Zhang, Lixing You, Wei Long Wang, Yan Lin Tang, Qi Zhao, Xiang Xiang Sun, Erika AnderssonAbstract:Quantum digital signatures (QDSs) provide a means for signing electronic communications with information-theoretic security. However, all previous demonstrations of quantum digital signatures assume trusted Measurement devices. This renders them vulnerable against detector side-channel attacks, just like quantum key distribution. Here we exploit a Measurement-device-independent (MDI) quantum network, over a metropolitan area, to perform a field test of a three-party MDI QDS scheme that is secure against any detector side-channel attack. In so doing, we are able to successfully sign a binary message with a security level of about ${10}^{\ensuremath{-}7}$. Remarkably, our work demonstrates the feasibility of MDI QDSs for practical applications.
