On the Capacity of the Quantum Switch with and without Entanglement Decoherence

TL;DR

This paper analyzes the capacity of the quantum switch under two decoherence models, providing capacity regions and throughput-optimal policies, advancing understanding of quantum network performance under decoherence effects.

Contribution

It characterizes the switch capacity region for two key decoherence models and proposes throughput-optimal policies using gradient descent.

Findings

Capacity regions are characterized for both decoherence models.

Throughput-optimal policies are developed based on gradient descent.

The models set bounds on quantum switch performance under decoherence.

Abstract

This paper studies the capacity of the quantum switch for two decoherence models: when link-level entanglements last (i) for a time slot, or (ii) until they are used to serve a request (i.e., there is no decoherence). The two models are important as they set lower and upper bounds on the capacity region for any other decoherence model. The paper's contributions are to characterize the switch capacity region for both decoherence models and to propose throughput-optimal policies based on gradient descent.