Meaningful Spins Quantum Computers Based On Spin Qubits Work Longer And More Securely

The Project Spinning proves that hybrid integrable, scalable solid-state quantum devices, which operate close to room temperature, can create better quantum computers.

The project consortium of the BMFTR project Spinning (Diamond spin photon based quantum computer) demonstrated an optimally scalable, universal quantum computer based on spin qubits in diamond after three years of research. It offers significant advantages compared to other quantum computing approaches. The spin qubits in diamond developed in the process are characterized by longer operation times and smaller error rates than comparable commercially available superconducting systems. The so-called photonic coupling over distances of more than 66 feet promises to be a basis for more powerful distributed quantum computers. Quantum registers were created through photonic coupling using optical microresonators, which surpass all common systems and expectations in benchmark analyses, as emphasized by the project participants from the Fraunhofer Institute for Applied Solid State Physics (IAF) in Freiburg im Breisgau (Germany).

The Achieved Improvements in Quantum Computing

The researchers created the qubit registers using color centers in diamond and the surrounding nuclear spins, which are photonic coupled with microresonators over several registers and distances of more than 66 feet. This innovative approach thus makes it possible to overcome distances of several meters between quantum registers. The concept of the "Spin Photon"-based quantum computer has great transfer potential because it not only has high scalability but also high connectivity, enabling a flexible connection with conventional computers. The project team was able, for the first time, to successfully prove the entanglement of two registers, each with six qubits over the mentioned distance, achieving a high average fidelity of over 0.9 (in terms of the similarity of the entangled states). There were also significant improvements in the central hardware, software, and peripherals of the novel quantum computer. Germanium and tin vacancy defects, which can also serve as qubits, were successfully detected in accompanying components (detectors and sources), and diamond materials with a controlled nuclear spin bath were produced. Additionally, high Q-factors for diamond-based microresonators were achieved, in which color centers could be specifically placed.

Significantly Longer Coherence Time Despite Greater Distance

The "Spin Photon"-based quantum computer, which currently comprises twelve qubits, achieves the same results in 1-qubit gates with an error rate of less than 0.5 percent as the prominent SJJ models Eagle (127 qubits) and Heron (154 qubits), which are part of the commercially usable IBM quantum computing cloud. In terms of coherence time, the new quantum computer significantly exceeds the SJJ models (over 50 microseconds) with a length of over 10 milliseconds, even though the entanglement distance is much greater at 66 feet compared to a few millimeters. This allows for longer computation operations to tackle relatively more complex problems.

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