Measurement Device Independent Quantum Digital Signature (MDI-QDS): Difference between revisions

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*'''Key Distribution:''' Seller uses MDI-KGP twice with Buyer and Verifier, each, to generate four different [[correlated]] keys. Both Seller and Receiver have two keys each, one for message bit 0 and one for message bit 1. Sender's signature for a particular message bit is a conjugation of corresponding key for message bit sent to the Buyer and the Verifier.  
*'''Key Distribution:''' Seller uses MDI-KGP twice with Buyer and Verifier, each, to generate four different [[correlated]] keys. Both Seller and Receiver have two keys each, one for message bit 0 and one for message bit 1. Sender's signature for a particular message bit is a conjugation of corresponding key for message bit sent to the Buyer and the Verifier.  
*'''MDI-KGP:''' MDI-KGP consists of the following steps  (only quantum communication part) from MDI-QKD protocol in [[Measurement Device Independent Quantum Digital Signature (MDI-QDS)#References|(2)]]:</br>
*'''MDI-KGP:''' MDI-KGP consists of the following steps  (only quantum communication part) from MDI-QKD protocol in [[Measurement Device Independent Quantum Digital Signature (MDI-QDS)#References|(2)]]:</br>
The MDI-QKD protocol assumes a trusted third party, arbitrator. The following steps are performed with Seller and each recipient, pairwise.  
The MDI-QKD protocol requires a third party, arbitrator. The following steps are performed with Seller and each recipient, pairwise.  
**''State Preparation:'' Seller and buyer/verifier prepare states in randomly chosen basis (from [[X, Z bases]]) and chosen intensity. These states are sent to the arbitrator
**''State Preparation:'' Seller and buyer/verifier prepare states in randomly chosen basis (from [[X, Z bases]]) and chosen intensity. These states are sent to the arbitrator
**''Measurement:'' Arbitrator, if honest, performs Bell measurement on the received states. If the measurement is successful, Bell state is communicated by arbitrator over public channel.
**''Measurement:'' Arbitrator, if honest, performs Bell measurement on the received states. If the measurement is successful, Bell state is communicated by arbitrator over public channel.
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