Anonymous quantum communication

TL;DR

This paper introduces a novel quantum communication protocol enabling anonymous, information-theoretically secure transmission of quantum states against active adversaries, with perfect sender and receiver anonymity and minimal privacy risk.

Contribution

It is the first protocol achieving anonymous quantum state transfer with security against active adversaries and no assumptions on participant honesty.

Findings

Protocol guarantees anonymity of sender and receiver.

Quantum state transfer is secure with exponentially small failure probability.

The protocol is robust against a single corrupt participant causing aborts.

Abstract

We present the first protocol for the anonymous transmission of a quantum state that is information-theoretically secure against an active adversary, without any assumption on the number of corrupt participants. The anonymity of the sender and receiver is perfectly preserved, and the privacy of the quantum state is protected except with exponentially small probability. Even though a single corrupt participant can cause the protocol to abort, the quantum state can only be destroyed with exponentially small probability: if the protocol succeeds, the state is transferred to the receiver and otherwise it remains in the hands of the sender (provided the receiver is honest).