Universal Nested Quantum Switch
Jorge Miguel-Ramiro, Maria Flors Mor-Ruiz, Wolfgang D\"ur

TL;DR
This paper introduces a scalable, resilient quantum network construction that distributes entanglement efficiently without relying on a central node, improving over previous methods in resource scaling.
Contribution
It presents a novel nested quantum switch architecture with logarithmic qubit and Bell pair scaling, enhancing distributed quantum network capabilities.
Findings
Achieves logarithmic qubits per node with $O(n\,log n)$ Bell pairs.
Provides a flexible, fully connected pairwise quantum network.
Introduces a graph state variant with minimal qubits per node.
Abstract
The quantum switch is a basic network primitive that allows one to connect multiple nodes in a quantum network via a central node. We show that the same functionality can be achieved with a different geometry that does not rely on a powerful and large central unit, but instead utilizes evenly distributed resources. This approach is resilient against node failures. We provide a nested construction with logarithmically many qubits per node and a total of Bell pairs, in contrast to other distributed approaches based on pre-shared entanglement that scale as . The construction achieves fully flexible pairwise connectivity, where the shared resource state can be locally transformed into arbitrarily distributed Bell states. We also present a graph state variant with just one qubit per node, which allows one to generate Bell pairs.
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Taxonomy
TopicsQuantum Computing Algorithms and Architecture · Quantum Information and Cryptography · Quantum Mechanics and Applications
