Quantum Anonymity for Quantum Networks

We present the first quantum anonymous notification (QAN) protocol that introduces anonymity and paves the way for anonymous secure quantum communication in quantum networks. QAN protocol has applications ranging from multiparty quantum computation to quantum internet. We utilize the QAN protocol to propose an anonymous quantum private comparison protocol in an $n$-node quantum network. This protocol can compare private information of any $2 \leq k \leq n$ parties with the help of the remaining $n-k$ parties and a semi-honest third party. These protocols feature a traceless property, i.e., encoding operations cannot be traced back to their originating sources. Security analysis shows that this protocol is robust against external adversaries and malicious participants.