Super Distance Communication with Quantum Entanglement

Hans J. Briegel

Kai Yuan

Super distance communication with quantum packet selection and grouping plus interval correction. The first step is to group the light quantum, 2 pairs of entangled quantum constitute a group,so the group include 4 light quantum. The second step will be compiled for each of the 3 groups of quantum,we call the 3 groups as a round. By observe a round(6 light quantems) we determine valid round and invalid round.By valid round and interval we could send or receive message.

Ola M. Hegazy, Ayman Mohammad Bahaa-Eldin, Yasser H. Dakroury

This paper introduces a new quantum protocol for secure direct communication. This protocol is based on Entanglement and Super-Dense coding. In this paper we present some basic definitions of entanglement in quantum mechanics, present how to use the maximally entangled states known as Bell States, and super dense coding technique to achieve secure direct message communication. Finally, we will apply some error models that could affect the transmission of the quantum data on the quantum channels, and how to treat these errors and acquire a safe transmission of the data.

L.-M. Duan, Mikhail D. Lukin, P. Zoller +1 more

Michał Horodecki, Paweł Horodecki, Ryszard Horodecki

Jan Czajkowski, Marcin Jarzyna, Rafał Demkowicz-Dobrzański

We point out a contrasting role the entanglement plays in communication and estimation scenarios. In the first case it brings noticeable benefits at the measurement stage (output super-additivity), whereas in the latter it is the entanglement of the input probes that enables significant performance enhancement (input super-additivity). We identify a weak estimation regime where a strong connection between concepts crucial to the two fields is demonstrated; the accessible information and the Holevo quantity on one side and the quantum Fisher information related quantities on the other. This allows us to shed new light on the problem of super-additivity in communication using the concepts of quantum estimation theory.