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1.0 B. Challenges in Distributed Quantum Computing
0.8 1) Efficient Routing for Collaborative Quantum Comput-
ers: With long-distance links in quantum networks, quantum
0.6 repeaters have been introduced as an intermediate for com-
municating between quantum computers. The quantum router
1x cost 2x cost 3x cost 4x cost 5x cost architectureisdesignedtosustainentanglementoverquantum
Cost of new QC deployment networks consisting of quantum memories coupled through
photons [9]. The quantum router architecture is required to
(b) Comparison among the proposed, EVF, and random models
improve entanglement fidelity and deliver effective quantum
Fig. 3: The cost breakdown and comparison of the stochastic
routing while reducing memory latency across quantum and
programming model for a resource allocation in distributed
repeater networks. Open challenges remain to design an effi-
quantum computing.
cient quantum routing to control entanglement fidelity includ-
ing long-distance links in distributed quantum computing.
2) Coexistence of Multiple Distributed Quantum Algo-
to account for variations in the deployment costs of the on-
rithms: Sincetherewillbeavarietyofoptimizationproblems
demand quantum computers.
withdifferentstructuresinfuturenetworks,thecorresponding
quantum algorithms required for them will be different ac-
IV. OPPORTUNITIESANDCHALLENGES
cordingly, from the number of qubits to the type of quantum
A. Applications in Collaborative Optimization
gates. For a single optimization problem, distributed quantum
1) FutureSmartGrid: Extendingfromclassicalcomputing, computingcandividetheproblemintomultiplehomogeneous
quantum computing can be used to enhance computational subproblems and deploy them on interconnected quantum
approaches that support decision-making in smart grids, as computers for cooperative solutions. However, to meet the
illustrated in [6]. The current smart grid issues also involve multi-taskandmulti-algorithmrequirements,distributedquan-
power systems that operate on several timescales and dimen- tum computing must be equipped with the ability to handle
sionsandmustberesolvedimmediately.Toaddressupcoming heterogeneousquantumcomputingtasks.Therefore,standard-
smart grid concerns, distributed quantum computing is more izedprotocolsandefficientcollaborationwillbeindispensable
feasible and promising than quantum computing. in distributed quantum computing in future complex network
2) Future Internet of Things: Inspired by the aspects of optimizationproblems,e.g.,criticalandsecurecommunication
acquiring Internet of Things (IoT) data and improving data in military environments.
accuracy analysis, the article [2] presents a novel quantum 3) Adaptive Quantum Resource Allocation: According to
computing-inspired (IoT-QCiO) optimization to optimize IoT- various applications in future networks, such as mission-
sensor space by using quantum formalization based on quan- critical applications in military communications, distributed
quantum computing must consider dynamic environments of discussedtheopportunitiesandchallengesofdistributedquan-
using quantum resources and channels. To measure qubits, tum computing in future networks.
therearepossibilitiesonentanglementofqubitsthatmayincur
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