Subject: [Qirg] maximum transmission rate of qubits

From: Gelard Patrick <[email-masked]>
Date: Tue, 23 Jul 2019 06:50:02 +0000

Hi all,

In this article “End-to-end capacities of a quantum communication network” : https://www.nature.com/articles/s42005-019-0147-3.pdf it is stated that :

After a long series of studies that started back in 2009 with the introduction of the reverse coherent information of a bosonic channel, ﬁnally showed that the maximum rate at which two remote parties can distribute quantum bits (qubits), entanglement bits (ebits), or secret bits over a lossy channel (e.g., an optical ﬁber) is equal to −log2(1 − η), where η is the channel’s transmissivity. This limit is the Pirandola–Laurenza–Ottaviani–Banchi (PLOB) bound and cannot be surpassed even by the most powerful strategies that exploit arbitrary local operations (LOs) assisted by two-way classical communication (CC), also known as adaptive LOCCs16.

This seems to be an important barrier to achieving the very high speed that we know today in traditional communication, right?

/Patrick