Quantum computation with noisy operations

TL;DR

This paper demonstrates that universal quantum computation is achievable using low-fidelity, noisy operations by controlling the dynamics of quantum systems, challenging the notion that high-fidelity operations are necessary.

Contribution

It introduces a method to perform universal quantum computation with fidelity below 90% using noisy operations, highlighting a new approach to quantum control.

Findings

Low-fidelity operations can induce coherent evolution in quantum subsystems.

Universal quantum computation is possible with operations of fidelity less than 90%.

Noisy operations can be harnessed rather than solely being detrimental.

Abstract

In this paper, we show how to use low-fidelity operations to control the dynamics of quantum systems. Noisy operations usually drive a system to evolve into a mixed state and damage the coherence. Sometimes frequent noisy operations result in the coherent evolution of a subsystem, and the dynamics of the subsystem is controlled by tuning noisy operations. Based on this, we find that universal quantum computation can be carried out by low-fidelity (fidelity $<90\%$) operations.