A Distributed Architecture for Secure Delegated Quantum Computation

Abstract

In this paper, we propose a distributed secure delegated quantum computation protocol, by which an almost classical client can delegate a (dk)-qubit quantum circuit to d quantum servers, where each server is equipped with a 2k-qubit register that is used to process only k qubits of the delegated quantum circuit. None of servers can learn any information about the input and output of the computation. The only requirement for the client is that he or she has ability to prepare four possible qubits in the state of (|0⟩+eiθ|1⟩)/2, where θ∈{0,π/2,π,3π/2}. The only requirement for servers is that each pair of them share some entangled states (|0⟩|+⟩+|1⟩|−⟩)/2 as ancillary qubits. Instead of assuming that all servers are interconnected directly by quantum channels, we introduce a third party in our protocol that is designed to distribute the entangled states between those servers. This would simplify the quantum network because the servers do not need to share a quantum channel. In the end, we show that our protocol can guarantee unconditional security of the computation under the situation where all servers, including the third party, are honest-but-curious and allowed to cooperate with each other.

Quantum neural network with privacy protection of input data and training parameters

“…The privacy protection of quantum machine learning is an emergent field and there is a lot of research about it. Most of the existing literature protects privacy by means of quantum homomorphic encryption [15][16][17][18][19][20][21][22], quantum differential privacy [23,24] and quantum secure multi-party computing [25][26][27]. Each method achieves privacy protection in different ways and presents different levels of security and availability.…”

Quantum Information and Computation

“…Delegating computations to the companies that offer quantum computing may be a better choice to access quantum computers. In [ 9 ], Ma et al propose a distributed secure delegated quantum computation protocol, which allows clients to delegate their private computation to several quantum servers. Ma et al show that their protocol can guarantee unconditional security of the computation under the situation where all servers, including the third party, are honest but curious, and they are allowed to cooperate with each other.…”