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Through electromagnetically-induced transparency (EIT) assisted spontaneous four-wave mixing, we produce the entangled paired photons with a coherence time of 2.34 μs from a cold atom cloud. The EIT dephasing rate is the ultimate limit.
The principle of a dual mechanical port (DMP) machines is proposed in 2002 [1], and since then, many different topologies of DMP machines have been proposed [2]. The structure of the DMP machine which has been proposed in [3] is compromised by inner motor and outer motor, the inner motor is compromised by inner rotor and outer rotor, and the outer motor is compromised by outer rotor and the stator,...
A refractive index buffer enhanced grating coupler in silicon-on-insulator (SOI) was demonstrated. By a PMMA cladding layer, the grating coupler with the efficiency of 44% and 3-dB bandwidth of > 40 nm was obtained.
A diffractive grating in silicon was demonstrated for near vertical off-chip coupling between Silicon-on-insulator (SOI) photonic nanowire and optical fiber. By simulation, the coupling efficiency of 46% from nanowire to fiber was predicted. Finally, the grating coupler with the efficiency of 25% and 3-dB bandwidth of 45 nm was obtained.
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