Toshiba‘s new breakthrough in quantum computing—its Double-Transmon Coupler—is expected to significantly enhance the performance of superconducting quantum computers. Collaborating with RIKEN, Toshiba’s team achieved a world-class fidelity of 99.90% for a two-qubit gate, which is crucial for quantum computation. This innovation addresses key challenges such as reducing residual coupling and improving coherence time in quantum systems.
The Double-Transmon Coupler works by coupling two transmon qubits, allowing precise control over their interaction. This setup achieved a gate time of 48 ns with a residual coupling strength of just 6 kHz, outperforming traditional tunable couplers. The experiment also achieved a high coherence time, essential for maintaining quantum superposition states during operations, with T1 values ranging between 210 – 230 μs and T2 values ranging between of 130 -360 μs.
The successful demonstration positions this technology as a cornerstone for scaling quantum systems, which could lead to practical applications in fields like drug development, carbon neutrality, and solving complex societal challenges. Toshiba and RIKEN now aim to push towards a 99.99% fidelity and expand the system’s scalability for real-world quantum computing solutions.
For more information on this research, visit Physical Review X, or refer to the official press release by Toshiba here.
November 22, 2024
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