Secure Client- Server Delegated Computation: Difference between revisions

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 == Functionality Description==
-Delegated Computation is the task of assigning computation on hidden data to a powerful untrusted party (a device) by a weak (in terms of computational powers) party while maintaining privacy of hidden data from the powerful party. Protocols under this functionality are commonly called Client (weak party)-Server (powerful party) protocols. Delegated Quantum Computation (DQC) protocols involve partially/fully classical Client delegate a quantum computation task to a fully powerful quantum Server. All DQC protocols involve three main stages, Preparation Stage, Computation Stage, Output Correction Stage. The roles of Client and Server in the different stages may differ according to the type of communication used. It can be performed via classical and quantum communication. If the communication is carried out during the computation stage, it is online communication else if it is carried out only at during Preparation and Correction stage, it is called offline communication. It can be verifiable or non-verifiable. Hence, it is classified as follows.
+Delegated Computation is the task of assigning computation on hidden data to a powerful untrusted party (a device) by a weak (in terms of computational powers) party while maintaining privacy of hidden data from the powerful party. Protocols under this functionality are commonly called Client (weak party)-Server (powerful party) protocols. Delegated Quantum Computation (DQC) protocols involve partially/fully classical Client delegating a quantum computation to fully powerful single/multiple quantum Server/Servers. All DQC protocols involve three main stages, Preparation Stage, Computation Stage and Output Correction Stage. The roles of Client and Server in the different stages may differ according to the type of communication used. It can be performed via classical and quantum communication. If it is carried out only during Preparation and Correction stage, it is called offline communication else if the communication is carried out during the computation stage, it is online communication. If the outcome can be verified by the Client it is a verifiable delegated quantum computation protocol. Hence, based on the above requirements, DQC protocols can be classified as follows.
 ===Classical Online Communication-Quantum Offline Communication===
 It involves a partially quantum Client perform a one time quantum communication to send input to the Server, in the preparation Stage and then to receive outputs from the Server, during output correction. The Client and Server then exchange classical messages during the computation phase. Universal Blind Quantum Computation (UBQC) is a protocol falling under this category. In this protocol Client hides his input, output and computation from the Server using [[Supplementary Information#Measurement Based Quantum Computation|'''MBQC''']] by sending hidden quantum states to the Server. UBQC protocols can be realised by a [[Prepare and Send-Universal Blind Quantum Computation|'''Prepare and Send UBQC''']] protocol where client prepares and sends the input states to the Server. If the task performed by the Server can be verified by the Client, the protocol is Verifiable Universal Blind Quantum Computation (VUBQC). Same as UBQC, VUBQC can also be realised by [[Prepare and Send Verifiable Universal Blind Quantum Computation|'''Prepare and Send VUBQC''']].