  Broadcasting information anonymously becomes more difficult as surveillance
technology improves, but remarkably, quantum protocols exist that enable
provably traceless broadcasting. The difficulty is making scalable entangled
resource states that are robust to errors. We propose an anonymous broadcasting
protocol that uses a continuous-variable surface-code state that can be
produced using current technology. High squeezing enables large transmission
bandwidth and strong anonymity, and the topological nature of the state enables
local error mitigation.
