Ordered bundles of silver-halide fibers, which are highly transparent in the middle infrared, are fabricated by multiple extrusions from single crystals. We fabricate and characterize the optical properties of thin and flexible bundles of diameters of 0.7-2.0 mm that incorporate 100 individual fibers. The measurements include attenuation, resolution, cross talk, near-field scanning of single fibers in the bundle, and bending losses. Bundles of lengths of several meters transmit thermal images of bodies whose temperature is near room temperature. These bundles would be useful for medical, industrial, and military applications, and in particular for endoscopic thermal imaging.
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We propose an alternative scheme for implementing the antibunching effects of two-magnon bundle in a hybrid ferromagnet-superconductor system, where a magnon mode from the yttrium iron garnet (YIG) sphere interacts with a three-level superconducting qubit via photon virtual excitation in the microwave cavity. With the help of the qubit driving from the ground state to the excited state, the cascaded emission of magnon occurs and then the two-magnon bundle is formed. By analyzing the ordinary and generalized second-order correlation functions, it is found that the antibunched two-magnon bundle could be achieved via properly choosing the system parameters, which is originated from the anharmonicity of dressed energy levels induced by magnon-qubit couplings.
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