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International Journal of Theoretical Physics

Secure Multi-Party Quantum Computation Based on Blind Quantum Computation

Gui-Ju Qu, Ming‐Ming Wang

Published Jul 12, 2021• 9 citations
Publisher
DOI
10.1007/s10773-021-04902-0

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Abstract Blind Quantum Computing (BQC) is a protocol proposed in recent years to tackle the practical need where users want to perform quantum computing tasks but lack the necessary capabilities, and thus delegate the work to quantum computing platforms while keeping their data secure throughout the process. Besides, its characteristics provide new ways for secure multi-party computation, helping multiple untrusted users to compute together securely. Most existing secure multi-party computation protocol based on blind quantum computing rely on DT(G) states to perform joint computation. However, this can lead to security risks because one client has too much authority, and these schemes also lack generality. In this paper, a secure multi-party computation protocol is proposed based on brickwork states. By exploiting and optimizing the properties of these states, the security issues in joint client computation are solved and centralized authority is avoided. Meanwhile, it reflects the interactive mode in multi-party computation. The proposed protocol effectively improves the generality of computation.

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Abstract Blind Quantum Computing (BQC) is a protocol proposed in recent years to tackle the practical need where users want to perform quantum computing tasks but lack the necessary capabilities, and thus delegate the work to quantum computing platforms while keeping their data secure throughout the process. Besides, its characteristics provide new ways for secure multi-party computation, helping multiple untrusted users to compute together securely. Most existing secure multi-party computation protocol based on blind quantum computing rely on DT(G) states to perform joint computation. However, this can lead to security risks because one client has too much authority, and these schemes also lack generality. In this paper, a secure multi-party computation protocol is proposed based on brickwork states. By exploiting and optimizing the properties of these states, the security issues in joint client computation are solved and centralized authority is avoided. Meanwhile, it reflects the interactive mode in multi-party computation. The proposed protocol effectively improves the generality of computation.
Blind quantum computing (BQC) ensures that a classical client could delegate complex computing tasks to a remote quantum server safely. In order to detect the dishonest behavior of the participants, we present a verifiable multi-party universal BQC protocol in distributed networks. By using the stabilizer formalism, we propose an honesty check method to test the correctness of the graph states generated by the servers. The honesty of both the clients and the servers can be judged fairly with the help of the arbitrator. Moreover, a load balancer is introduced to control the possible breakdown of servers in the network. No-signaling principle ensures the unconditional security of the protocol. Through the use of universal resource states, our protocol can be applied in more multi-party verifiable universal BQC protocols. The failure management and workload balancing of the protocol also provide a promising prospect for the future BQC network.
Blind quantum computation (BQC) provides a solution for clients with limited quantum capabilities to delegate their quantum computational tasks to remote quantum servers while keeping their own data private. In this paper, we first propose three multi-party verifiable blind quantum computation (MPVBQC) protocols, each of which can handle one type of clients with certain simple quantum capabilities such as making single-qubit measurements, preparing single qubits, or performing a few single-qubit gates. Then a flexible and hybrid MPVBQC framework for multi-type clients in quantum networks is given by combining the three proposed MPVBQC protocols. It simultaneously allows at least three types of clients in quantum networks to achieve BQC depending on their own quantum devices. Furthermore, all the proposed protocols can achieve identity authentication, resist both insider and outsider attacks, and be verifiable which means that the clients can verify the correctness of their computational results.