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Vardoyan, G.S. (author), van Milligen, Emily (author), Guha, Saikat (author), Wehner, S.D.C. (author), Towsley, Don (author)We consider the problem of multipath entanglement distribution to a pair of nodes in a quantum network consisting of devices with nondeterministic entanglement swapping capabilities. Multipath entanglement distribution enables a network to establish end-to-end entangled links across any number of available paths with preestablished link-level...journal article 2024
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Gauthier, S.S. (author), Vardoyan, G.S. (author), Wehner, S.D.C. (author)Entanglement between quantum network nodes is often produced using intermediary devices - such as heralding stations - as a resource. When scaling quantum networks to many nodes, requiring a dedicated intermediary device for every pair of nodes introduces high costs. Here, we propose a cost-effective architecture to connect many quantum...journal article 2023
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Gómez Iñesta, A. (author), Wehner, S.D.C. (author)Entangled states shared among distant nodes are frequently used in quantum network applications. When quantum resources are abundant, entangled states can be continuously distributed across the network, allowing nodes to consume them whenever necessary. This continuous distribution of entanglement enables quantum network applications to...journal article 2023
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Iñesta, Álvaro G. (author), Vardoyan, G.S. (author), Scavuzzo, Lara (author), Wehner, S.D.C. (author)We study the limits of bipartite entanglement distribution using a chain of quantum repeaters that have quantum memories. To generate end-to-end entanglement, each node can attempt the generation of an entangled link with a neighbor, or perform an entanglement swapping measurement. A maximum storage time, known as cutoff, is enforced on the...journal article 2023
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Avis, G. (author), Ferreira da Silva, Francisco (author), Coopmans, T.J. (author), Dahlberg, E.A. (author), Jirovská, H. (author), Maier, D.J. (author), Rabbie, J. (author), Torres-Knoop, Ariana (author), Wehner, S.D.C. (author)We numerically study the distribution of entanglement between the Dutch cities of Delft and Eindhoven realized with a processing-node quantum repeater and determine minimal hardware requirements for verifiable blind quantum computation using color centers and trapped ions. Our results are obtained considering restrictions imposed by a real...journal article 2023
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Avis, G. (author), Rozpedek, F.D. (author), Wehner, S.D.C. (author)We study the performance (rate and fidelity) of distributing multipartite entangled states in a quantum network through the use of a central node. Specifically, we consider the scenario where the multipartite entangled state is first prepared locally at a central node and then transmitted to the end nodes of the network through quantum...journal article 2023
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Helsen, J. (author), Wehner, S.D.C. (author)We propose network benchmarking: a procedure to efficiently benchmark the quality of a quantum network link connecting quantum processors in a quantum network. This procedure is based on the standard randomized benchmarking protocol and provides an estimate for the fidelity of a quantum network link. We provide statistical analysis of the...journal article 2023
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Rabbie, J. (author), Chakraborty, K. (author), Avis, G. (author), Wehner, S.D.C. (author)We consider the problem of deploying a quantum network on an existing fiber infrastructure, where quantum repeaters and end nodes can only be housed at specific locations. We propose a method based on integer linear programming (ILP) to place the minimal number of repeaters on such an existing network topology, such that requirements on end...journal article 2022
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Dahlberg, E.A. (author), Helsen, J. (author), Wehner, S.D.C. (author)A graph H is a vertex-minor of a graph G if it can be reached from G by the successive application of local complementations and vertex deletions. Vertex-minors have been the subject of intense study in graph theory over the last decades and have found applications in other fields such as quantum information theory. Therefore it is natural to...journal article 2022
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Lee, Yuan (author), Bersin, Eric (author), Dahlberg, E.A. (author), Wehner, S.D.C. (author), Englund, Dirk (author)The past decade has seen tremendous progress in experimentally realizing the building blocks of quantum repeaters. Repeater architectures with multiplexed quantum memories have been proposed to increase entanglement distribution rates, but an open challenge is to maintain entanglement fidelity over long-distance links. Here, we address this...journal article 2022
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Pompili, M. (author), Delle Donne, C. (author), te Raa, I. (author), van der Vecht, B. (author), Skrzypczyk, M.D. (author), Maciel Ferreira, G. (author), de Kluijver, L. (author), Stolk, A.J. (author), Hermans, S.L.N. (author), Pawełczak, Przemysław (author), Kozlowski, W. (author), Hanson, R. (author), Wehner, S.D.C. (author)Scaling current quantum communication demonstrations to a large-scale quantum network will require not only advancements in quantum hardware capabilities, but also robust control of such devices to bridge the gap in user demand. Moreover, the abstraction of tasks and services offered by the quantum network should enable platform-independent...journal article 2022
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Dahlberg, E.A. (author), van der Vecht, B. (author), Delle Donne, C. (author), Skrzypczyk, M.D. (author), te Raa, I. (author), Kozlowski, W. (author), Wehner, S.D.C. (author)We introduce NetQASM, a low-level instruction set architecture for quantum internet applications. NetQASM is a universal, platform-independent and extendable instruction set with support for local quantum gates, powerful classical logic and quantum networking operations for remote entanglement generation. Furthermore, NetQASM allows for close...journal article 2022
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Pompili, M. (author), Hermans, S.L.N. (author), Baier, S. (author), Beukers, H.K.C. (author), Humphreys, P.C. (author), Schouten, R.N. (author), Vermeulen, R.F.L. (author), Tiggelman, M.J. (author), Dos Santos Martins, L. (author), Dirkse, B. (author), Wehner, S.D.C. (author), Hanson, R. (author)The distribution of entangled states across the nodes of a future quantum internet will unlock fundamentally new technologies. Here, we report on the realization of a three-node entanglement-based quantum network. We combine remote quantum nodes based on diamond communication qubits into a scalable phase-stabilized architecture, supplemented...journal article 2021
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Horta Ferreira da Silva, F. (author), Torres-Knoop, Ariana (author), Coopmans, T.J. (author), Maier, D.J. (author), Wehner, S.D.C. (author)Long-distance quantum communication via entanglement distribution is of great importance for the quantum internet. However, scaling up to such long distances has proved challenging due to the loss of photons, which grows exponentially with the distance covered. Quantum repeaters could in theory be used to extend the distances over which...journal article 2021
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Coopmans, T.J. (author), Knegjens, R.J. (author), Dahlberg, E.A. (author), Maier, D.J. (author), Nijsten, L.M.J. (author), de Oliveira Filho, J.A. (author), Papendrecht, M.N.G. (author), Rabbie, J. (author), Rozpedek, F.D. (author), Skrzypczyk, M.D. (author), Wubben, L.C.J. (author), de Jong, W. (author), Wehner, S.D.C. (author)In order to bring quantum networks into the real world, we would like to determine the requirements of quantum network protocols including the underlying quantum hardware. Because detailed architecture proposals are generally too complex for mathematical analysis, it is natural to employ numerical simulation. Here we introduce NetSquid, the...journal article 2021
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Vardoyan, G.S. (author), Skrzypczyk, M.D. (author), Wehner, S.D.C. (author)Distributed quantum applications impose requirements on the quality of the quantum states that they consume. When analyzing architecture implementations of quantum hardware, characterizing this quality forms an important factor in understanding their performance. Fundamental characteristics of quantum hardware lead to inherent tradeoffs...journal article 2021
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Goodenough, K.D. (author), Elkouss Coronas, D. (author), Wehner, S.D.C. (author)The rate at which quantum communication tasks can be performed using direct transmission is fundamentally hindered by the channel loss. Quantum repeaters allow one, in principle, to overcome these limitations, but their introduction necessarily adds an additional layer of complexity to the distribution of entanglement. This additional...journal article 2021
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How to transform graph states using single-qubit operations: Computational complexity and algorithmsDahlberg, E.A. (author), Helsen, J. (author), Wehner, S.D.C. (author)Graph states are ubiquitous in quantum information with diverse applications ranging from quantum network protocols to measurement based quantum computing. Here we consider the question whether one graph (source) state can be transformed into another graph (target) state, using a specific set of quantum operations (LC + LPM + CC): single...journal article 2020
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Dahlberg, E.A. (author), Helsen, J. (author), Wehner, S.D.C. (author)Critical to the construction of large scale quantum networks, i.e. a quantum internet, is the development of fast algorithms for managing entanglement present in the network. One fundamental building block for a quantum internet is the distribution of Bell pairs between distant nodes in the network. Here we focus on the problem of...journal article 2020
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Dahlberg, E.A. (author), Helsen, J. (author), Wehner, S.D.C. (author)Graph states, which include Bell states, Greenberger-Horne-Zeilinger (GHZ) states, and cluster states, form a well-known class of quantum states with applications ranging from quantum networks to error-correction. Whether two graph states are equivalent up to single-qubit Clifford operations is known to be decidable in polynomial time and has...journal article 2020