Juq-378 [OFFICIAL]

Benefits (practical view)

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To address and read out the qubits, a thin is patterned on the surface of the alloy, enabling evanescent coupling of microwave photons into the bulk. This hybrid photonic‑spin architecture eliminates the need for bulky cryogenic microwave cavities and opens the door to on‑chip quantum control. JUQ-378

Traditional solid‑state qubits—such as nitrogen‑vacancy (NV) centers in diamond or phosphorus donors in silicon—are isolated point defects that are deliberately spaced far apart to avoid unwanted dipolar interactions. JUQ‑378 departs from this paradigm by .

Overview

| Challenge | Current Status | Outlook | |-----------|----------------|---------| | | Coherence degrades sharply above 100 K (T(_2) ≈ 30 µs) | Materials engineering (e.g., heavier isotopes, strain‑tuning) may push operational temperature toward 150 K | | Scalable Qubit Addressability | Waveguide network limited to 2 mm spacing | Integration of frequency‑division multiplexing and on‑chip parametric amplifiers could support >10⁴ individually addressable qubits | | Fabrication Yield | Ion‑implantation damage leads to 2 % defect‑induced loss | Development of laser‑assisted doping promises sub‑10 nm placement accuracy with minimal collateral damage | | Thermal Management in Cryogenic Environments | Heat generated by microwave control pulses can raise local temperature by >5 K | Adoption of cryogenic superconducting microwave resonators reduces dissipated power by >80 % |

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The Mn‑based spin qubits have a large magnetic moment (5 µ(_B)), making them exceptionally sensitive to . When operated in a spin‑echo protocol, JUQ‑378 can achieve magnetic field sensitivities of 10 pT Hz(^-½) at 77 K, surpassing NV‑diamond sensors at room temperature. This performance, combined with the alloy’s mechanical durability, enables embedded magnetometers in aerospace structures (e.g., wing skins) and high‑precision gyroscopes for autonomous navigation.