Advancements in communication and quantum computing have led to the need for efficient quantum networks. Superconducting qubits are vital for quantum computation and require converting microwave states to optical states for long-distance communication. However, current coupling techniques suffer from high photon loss and scattering, hindering their efficiency. A fiber-to-chip coupler (FCC) is essential to achieve high coupling efficiency. To address this, a novel high refractive index lens (1.85 refractive index at 1550 nm) imprinted on a fiber end facet is proposed, enabling efficient light coupling to a waveguide. This approach allows shorter wavelengths due to the operation of the lens in the bonding medium, resulting in superior coupling efficiency. The new method aims to develop a robust packaging process for quantum communication networks that can operate at the millikelvin level.
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