Anonymous transmission in a noisy quantum network using the W state

The protocol allows a sender $S$ to transmit an arbitrary quantum state $|\psi \rangle$ to a receiver $R$ in an anonymous way and uses the $N$-partite $W$ state as a quantum resource.

Assumptions

The protocol relies on a set of classical subroutines (collision detection, receiver notification, veto and logical OR). Their proposed implementation [1] has been shown to be information-theoretically secure in the classical regime, even with an arbitrary number of corrupted participants, assuming the parties share pairwise authenticated private channels and a broadcast channel.

The protocol assumes that the implementations listed above remain secure even in the presence of a quantum adversary.

References

1. A. Broadbent and A. Tapp, inAdvances in Cryptology– ASIACRYPT 2007, edited by K. Kurosawa (Springer Berlin Heidelberg, Berlin, Heidelberg, 2007) pp. 410–426.