Figure 1
From: Entanglement Availability Differentiation Service for the Quantum Internet

Framework of the entanglement differentiation service in a multiuser quantum network. (a) Phase 1. Classical transmission. The \( {\mathcal E} \) encoder unit distributes the timing information for the legal transmit users U1, …, UK and receiver users B1, …, BK via a classical channel. (b) Phase 2. Quantum transmission. The users apply the core protocol for the entanglement establishment. Then, using the received timing information the transmit users U1, …, UK apply the local unitaries for time \({T}_{{U}_{{\rm{1}}}},\ldots ,{T}_{{U}_{K}}\).