Multipartite Entanglement Verification: Difference between revisions

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==Outline==
==Outline==
This protocol is based on the work in [https://www.nature.com/articles/ncomms13251 W. McCutcheon, A. Pappa et al.]. The goal is for a specific party called the Verifier to check whether the source has shared a GHZ-state among the n-nodes network. It goes as follow:
This protocol is based on the work in [https://www.nature.com/articles/ncomms13251 W. McCutcheon, A. Pappa et al.]. The goal is for a specific party called the [[Verifier]] to check whether the source has shared a GHZ-state among the n-nodes network. It goes as follow:


* '''Sharing phase:''' The source creates and shares an n-qubits quantum state to all the parties using a state generation resource and quantum channels.
* '''Sharing phase:''' The source creates and shares an n-qubits quantum state to all the parties using a state generation resource and quantum channels.
* '''Verification phase:''' The verifier sends angles to each party that corresponds to measurement basis, using classical authenticated channels
* '''Verification phase:''' 1.The verifier sends angles to each party that corresponds to measurement basis, using classical authenticated channels
* Each party, including the verifier, measures its qubits in the basis indicated by the received angle.  
2. Each party, including the verifier, measures its qubits in the basis indicated by the received angle.  
* It then sends its outcome to the verifier.
3. It then sends its outcome to the verifier.
* The Verifier checks the parity of the outcomes and broadcast if the shared state was a GHZ state.
4. The verifier checks the parity of the outcomes and broadcast if the shared state was a GHZ state.


==Notation==
==Notation==
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