Researchers develop quantum gate with 99.9% fidelity to boost computing reliability

Researchers at Japan’s RIKEN Center for Quantum Computing and Toshiba have developed a new quantum gate with 99.9% fidelity, significantly improving the performance of noisy intermediate-scale quantum (NISQ) devices. This gate uses a double-transmon coupler, enhancing qubit interaction. The double-transmon coupler allows precise control over qubit communication, addressing key challenges in quantum computing. The new gate effectively manages leakage and decoherence errors, maintaining high fidelity even with detuned qubits. This advancement promises to enhance the reliability of current quantum systems and supports the development of future quantum computing applications. The study is published in Physical Review X.