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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
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<title>FAQ - The QEM Zoo</title>
<meta name="description" content="Frequently asked questions about The QEM Zoo: what it is, how to use it, how to cite it, and how to contribute.">
<meta name="keywords" content="quantum error mitigation, QEM, quantum error suppression, QES, FAQ, quantum computing">
<meta name="author" content="Vincent Russo">
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</head>
<body>
<header>
<h1><a href="index.html">The QEM Zoo</a></h1>
<p class="subtitle">A comprehensive catalog of quantum error mitigation and suppression techniques</p>
</header>
<nav class="site-nav">
<a href="index.html">Protocols</a>
<a href="techniques.html">Techniques</a>
<a href="noise.html">Noise</a>
<a href="applications.html">Applications</a>
</nav>
<main class="faq-container">
<h1>Frequently Asked Questions</h1>
<section class="faq-section">
<h2>About The QEM Zoo</h2>
<div class="faq-item">
<h3>What is The QEM Zoo?</h3>
<p>
The QEM Zoo is a comprehensive, freely accessible catalog of quantum error mitigation (QEM)
and quantum error suppression (QES) techniques. It aims to be a living reference for researchers,
students, and practitioners working with near-term quantum computers.
</p>
<p>
The site is inspired by similar community resources like the
<a href="https://complexityzoo.net/Complexity_Zoo">Complexity Zoo</a> and the
<a href="https://errorcorrectionzoo.org/">Error Correction Zoo</a>.
</p>
</div>
<div class="faq-item">
<h3>Why does quantum error mitigation matter?</h3>
<p>
Today's quantum computers are noisy. Gate errors, decoherence, and crosstalk corrupt
computations well before they finish, and full fault-tolerant quantum error correction —
which can suppress these errors to arbitrarily low levels — requires hardware resources
far beyond what current devices offer. This leaves a gap: we have quantum processors
that are too noisy to run deep circuits reliably, yet too small to encode logical qubits
with error-correcting codes.
</p>
<p>
Quantum error mitigation (QEM) and quantum error suppression (QES) techniques bridge this gap.
Rather than correcting errors at the hardware level, they use clever circuit design,
classical post-processing, and statistical methods to extract more accurate answers from
noisy results. These techniques are what make it possible to do useful work on near-term
quantum hardware — and understanding their strengths, limitations, and tradeoffs is essential
for anyone working with today's quantum devices.
</p>
</div>
<div class="faq-item">
<h3>Why does this exist?</h3>
<p>
The need for such a resource was identified as an open problem in the comprehensive review
<a href="https://arxiv.org/abs/2210.00921">"Quantum Error Mitigation" by Cai et al. (2023)</a>,
published in Reviews of Modern Physics. The field of quantum error mitigation has grown rapidly,
with dozens of techniques proposed across hundreds of papers. Keeping track of all these methods,
their relationships, tradeoffs, and applications has become increasingly difficult.
</p>
<p>
The QEM Zoo aims to fill this gap by providing a structured, searchable, and continuously updated
reference that organizes this knowledge in one place.
</p>
</div>
</section>
<section class="faq-section">
<h2>Using The QEM Zoo</h2>
<div class="faq-item">
<h3>How do I navigate the site?</h3>
<p>The site is organized into several main sections:</p>
<ul>
<li><strong><a href="index.html">Protocols</a></strong> - The main catalog of QEM and QES methods (e.g., ZNE, PEC, dynamical decoupling)</li>
<li><strong><a href="techniques.html">Techniques</a></strong> - Supporting methods like noise scaling and extrapolation</li>
<li><strong><a href="noise.html">Noise</a></strong> - Types of quantum noise and which techniques address them</li>
<li><strong><a href="applications.html">Applications</a></strong> - Real-world use cases like VQE, QAOA, and quantum simulation</li>
</ul>
<p>
Each page has a search bar and category filters. You can also use the A-Z navigation to jump to
techniques alphabetically. Click on any technique name to see its detailed page with equations,
references, and related methods.
</p>
</div>
</section>
<section class="faq-section">
<h2>Additional Resources</h2>
<div class="faq-item">
<h3>Where can I learn more about quantum error mitigation?</h3>
<p>Here are some recommended resources:</p>
<ul class="resource-list">
<li>
<strong>Review Paper:</strong>
<a href="https://arxiv.org/abs/2210.00921">Quantum Error Mitigation (Cai et al., 2023)</a> -
Comprehensive review in Reviews of Modern Physics
</li>
<li>
<strong>Software:</strong>
<a href="https://mitiq.readthedocs.io/">Mitiq</a> -
Open-source Python library for quantum error mitigation by Unitary Fund
</li>
<li>
<strong>Related Resource:</strong>
<a href="https://errorcorrectionzoo.org/">Error Correction Zoo</a> -
Catalog of quantum error correcting codes
</li>
</ul>
</div>
</section>
<section class="faq-section">
<h2>Citing The QEM Zoo</h2>
<div class="faq-item">
<h3>How do I cite this resource?</h3>
<p>If you find The QEM Zoo useful in your research, please cite it as:</p>
<div class="citation-box">@misc{qemzoo,
author = {Russo, Vincent},
title = {The {QEM} Zoo: A Catalog of Quantum Error Mitigation and Suppression Techniques},
year = {2025},
url = {https://qemzoo.com},
note = {Accessed: YYYY-MM-DD}
}</div>
<p style="margin-top: 1rem;">Or in plain text:</p>
<div class="citation-box">V. Russo, "The QEM Zoo: A Catalog of Quantum Error Mitigation and Suppression Techniques," 2025. [Online]. Available: https://qemzoo.com</div>
</div>
</section>
<section class="faq-section">
<h2>Contributing & Contact</h2>
<div class="faq-item">
<h3>I found an error or have a suggestion. How do I report it?</h3>
<p>
I welcome corrections, suggestions, and contributions! If you've found an error,
have a technique to add, or want to suggest improvements, please reach out:
</p>
<p class="contact-email">
<a href="mailto:vincentrusso1@gmail.com" id="contact-link">Click to reveal email</a>
</p>
<script>
document.getElementById('contact-link').addEventListener('click', function(e) {
e.preventDefault();
var u = 'vincentrusso1'; var d = 'gmail.com';
var addr = u + '@' + d;
this.textContent = addr;
this.href = 'mailto:' + addr;
});
</script>
<p>
When reporting errors, please include:
</p>
<ul>
<li>The specific page or technique where the error appears</li>
<li>What the error is and what the correct information should be</li>
<li>A reference (paper, textbook, etc.) supporting the correction, if applicable</li>
</ul>
</div>
<div class="faq-item">
<h3>Can I contribute a new technique or application?</h3>
<p>
Yes! If you know of a QEM/QES technique that isn't covered, or if you have detailed
information to add to an existing entry, please reach out. Contributions with references
to peer-reviewed papers are especially appreciated.
</p>
</div>
</section>
<div class="disclaimer">
<h3>Disclaimer</h3>
<p>
Just because qubits are noisy doesn't mean the information about them needs to be.
The QEM Zoo is maintained by <a href="https://vprusso.github.io/">Vincent Russo</a> as a community resource,
and I take full responsibility for any errors or inaccuracies on this site.
If you spot something wrong — a misattributed result, a mangled equation, a missing technique —
please don't just post-select it away. Reach out using the contact information above so it can be corrected.
</p>
<p>
The information provided here is for educational and research purposes. When using any technique in practice,
always consult the original papers cited in each entry.
</p>
</div>
</main>
<footer>
<p class="attribution">Created and maintained by <a href="https://vprusso.github.io/">Vincent Russo</a></p>
</footer>
</body>
</html>