# Reliable quantum circuits have defects

## TL;DR

This paper discusses how current quantum computing architectures rely on fault-tolerant error correction to achieve reliable quantum computations despite hardware defects, and explains why these defects can be beneficial.

## Contribution

It provides insights into the role of defects in quantum circuits and discusses strategies for reliable quantum computation with faulty hardware.

## Key findings

- Faulty quantum hardware can be effectively managed with error correction.
- Defects in quantum circuits can be advantageous for certain computations.
- Reliable large-scale quantum computers are feasible with current strategies.

## Abstract

State of the art quantum computing architectures are founded on the decision to use scalable but faulty quantum hardware in conjunction with an efficient error correcting code capable of tolerating high error rates. The promised effect of this decision is that the first large-scale practical quantum computer is within reach. Coming to grips with the strategy and the challenges of preparing reliable executions of an arbitrary quantum computation is not difficult. Moreover, the article explains why defects are good.