Quantum Circuits is a quantum hardware company focused on advancing fault-tolerant quantum computing. They claim to have invented the first dual-rail qubit with built-in error detection and a real-time control flow that enables efficient quantum performance, scalability, and integration with classical computing. The company presents a full-stack system featuring superconducting dual-rail cavity qubits, supported by a programming interface for developing algorithms and exploring quantum applications. Their messaging emphasizes progress toward commercial-ready quantum computing with error-aware capabilities and a pathway to quantum advantage. Based on their materials, they operate globally in the quantum computing hardware space, with an emphasis on high-fidelity, error-detecting qubits and scalable architectures.