Variational secure cloud quantum computing

Variational quantum algorithms (VQAs) have been considered to be useful applications of noisy intermediate-scale (NISQ) devices. Typically, in the VQAs, a parametrized ansatz circuit is used generate trial wave function, and parameters are optimized minimize cost function. On other hand, blind computing (BQC) has studied order provide algorithm with security by using cloud networks. A client limited ability perform operations hopes access computer server, BQC allows use server's without leakage client's information (such as input, running algorithms, output) server. However, designed for fault-tolerant computing, this requires many ancillary qubits, which may not suitable NISQ Here, we propose an efficient way implement guaranteed client. In our architecture, only N+ 1 qubits required, under assumption that form ansatzes known where N denotes necessary number original algorithms. The performs single-qubit measurements on qubit sent from measurement angles can specify No-signaling principle guarantees neither chosen nor outputs leaked This work paves new