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Entropy 2019, 21(3), 325; https://doi.org/10.3390/e21030325

Entanglement 25 Years after Quantum Teleportation: Testing Joint Measurements in Quantum Networks

Group of Applied Physics, University of Geneva, 1211 Geneva, Switzerland
Received: 27 September 2018 / Revised: 15 March 2019 / Accepted: 20 March 2019 / Published: 26 March 2019
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Abstract

Twenty-five years after the invention of quantum teleportation, the concept of entanglement gained enormous popularity. This is especially nice to those who remember that entanglement was not even taught at universities until the 1990s. Today, entanglement is often presented as a resource, the resource of quantum information science and technology. However, entanglement is exploited twice in quantum teleportation. Firstly, entanglement is the “quantum teleportation channel”, i.e., entanglement between distant systems. Second, entanglement appears in the eigenvectors of the joint measurement that Alice, the sender, has to perform jointly on the quantum state to be teleported and her half of the “quantum teleportation channel”, i.e., entanglement enabling entirely new kinds of quantum measurements. I emphasize how poorly this second kind of entanglement is understood. In particular, I use quantum networks in which each party connected to several nodes performs a joint measurement to illustrate that the quantumness of such joint measurements remains elusive, escaping today’s available tools to detect and quantify it. View Full-Text
Keywords: quantum teleportation; quantum measurements; nonlocality quantum teleportation; quantum measurements; nonlocality
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Gisin, N. Entanglement 25 Years after Quantum Teleportation: Testing Joint Measurements in Quantum Networks. Entropy 2019, 21, 325.

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