Quantum Switch for the Quantum Internet: Noiseless Communications through Noisy Channels
Marcello Caleffi, Angela Sara Cacciapuoti

TL;DR
This paper explores how a quantum switch can enhance quantum teleportation by enabling noiseless communication through noisy channels, leveraging indefinite causal order to improve reliability in quantum networks.
Contribution
It provides a theoretical analysis demonstrating the performance benefits of using a quantum switch in quantum teleportation, a novel approach in quantum communication engineering.
Findings
Quantum switch increases the probability of noiseless teleportation with higher channel noise.
Employing a quantum switch can make quantum communication more robust against noise.
The analysis shows counter-intuitive benefits of indefinite causal order in quantum channels.
Abstract
Counter-intuitively, quantum mechanics enables quantum particles to propagate simultaneously among multiple space-time trajectories. Hence, a quantum information carrier can travel through different communication channels in a quantum superposition of different orders, so that the relative time-order of the communication channels becomes indefinite. This is realized by utilizing a quantum device known as quantum switch. In this paper, we investigate, from a communication-engineering perspective, the use of the quantum switch within the quantum teleportation process, one of the key functionalities of the Quantum Internet. Specifically, a theoretical analysis is conducted to quantify the performance gain that can be achieved by employing a quantum switch for the entanglement distribution process within the quantum teleportation with respect to the case of absence of quantum switch. This…
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