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Measurement Device Independent Quantum Digital Signature (MDI-QDS) (edit)
Revision as of 02:11, 3 June 2019
, 3 June 2019→Outline
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The MDI-QKD protocol requires a 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 and randomly chosen intensity. These states are sent to the arbitrator | **'''State Preparation:'''Seller and buyer/verifier prepare states in randomly chosen basis and randomly chosen intensity. These states are sent to the arbitrator | ||
**'''Measurement:'''Arbitrator, if honest, performs [[Bell State Measurement (BSM)]] on the received states. | **'''Measurement:'''Arbitrator, if honest, performs [[Bell State Measurement (BSM)]] on the received states. In case of successful measurement, the outcome is a [[bell state]] which is declared over public channel. | ||
**'''Sifting:''' In case of successful BSM, Seller and buyer/verifier exchange the information regarding the intensity and basis used to prepare states over authenticated quantum channel. Otherwise they discard their data. The data corresponding to successful measurements are grouped into two sets, depending on the basis used for preparation. The above steps are repeated until the cardinality of both sets is more than required threshold number of elements for each set. In the end, Buyer/Verifier flips his bits in his two sets according to the Bell state obtained in each case (given in [[Measurement Device Independent Quantum Digital Signature (MDI-QDS)#Pseudo Code|Pseudo code]] below). | **'''Sifting:''' In case of successful BSM, Seller and buyer/verifier exchange the information regarding the intensity and basis used to prepare states over authenticated quantum channel. Otherwise they discard their data. The data corresponding to successful measurements are grouped into two sets, depending on the basis used for preparation. The above steps are repeated until the cardinality of both sets is more than required threshold number of elements for each set. In the end, Buyer/Verifier flips his bits in his two sets according to the Bell state obtained in each case (given in [[Measurement Device Independent Quantum Digital Signature (MDI-QDS)#Pseudo Code|Pseudo code]] below). | ||
**'''Parameter Estimation:''' | **'''Parameter Estimation:''' | ||