Quantum++: A modern C++ quantum computing library

Area of Science:

• Quantum Computing
• Computational Science
• Software Engineering

Background:

• Quantum computing harnesses quantum-mechanical phenomena for computation.
• Efficient simulation tools are crucial for developing quantum algorithms.
• Existing libraries may have limitations in flexibility or performance.

Purpose of the Study:

• To introduce Quantum++, a versatile, high-performance C++11 quantum computing library.
• To provide a general-purpose tool for simulating arbitrary quantum processes.
• To enable simulation of both quantum and classical reversible computations.

Main Methods:

• Developed as a header-only C++11 library for ease of integration.
• Implemented multi-threading for enhanced computational performance.
• Designed for broad applicability beyond specific qubit systems or tasks.

Main Results:

• Quantum++ can simulate quantum systems limited only by physical memory.
• Successfully simulated 25-qubit pure states and 12-qubit mixed states on standard hardware.
• Supports classical reversible logic, simulating billions of bits for applications like Toffoli gate circuit testing.

Conclusions:

• Quantum++ provides a powerful, flexible, and performant solution for quantum process simulation.
• The library's design facilitates ease of use and portability.
• Its dual capability in quantum and classical reversible computing broadens its utility in research and development.