Quantum network

A quantum network (sometimes also quantum internet ) is understood to be the connection of quantum information carriers ( quantum nodes ) by means of quantum channels .

concept

Since quantum information (e.g. qubits ) can not be copied due to the no-cloning theorem , information transfer as in a classic network is not possible. Rather, the quantum state must be transferred from one node to the other. One way to achieve this is to use quantum teleportation . If the transmission path is so large that path losses play a role, the quantum repeater scheme is suitable .

If any connections between different locations are to be established on the basis of quantum cryptography (long-distance quantum communication), a network of repeater stations is required that can be compared with the infrastructure of today's Internet. Such a quantum network is still a long way from everyday use; the modules required for this have already been implemented internationally as prototypes in laboratories.

Broadcast reports

• Ralf Krauter and Frank Grotelüschen : Web Q.0 - The quantum internet is taking shape , Deutschlandfunk - “ Science in focus ” from August 12, 2018

Individual evidence

1. ^ The Quantum Internet
2. ^ Long-distance quantum communication with atomic ensembles and linear optics

swell

• Seth Lloyd, Jeffrey H. Shapiro, and Franco NC Wong, Prem Kumar, Selim M. Shahriar, and Horace P. Yuen: Infrastructure for the Quantum Internet ; in: ACM SIGCOMM Computer Communications Review Volume 34, Number 5: October 2004, pp. 9-20.
• John Preskill: Plug-in quantum software , Nature, Volume 402, November 25, 1999, pp. 357-358