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Work Done in an Adiabatic Process01:20

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Consider the adiabatic compression of an ideal gas in the cylinder of an automobile diesel engine. The gasoline vapor is injected into the cylinder of an automobile engine when the piston is in its expanded position. The temperature, pressure, and volume of the resulting gas-air mixture are 20 °C, 1.00 x 105 N/m2, and 240 cm3 , respectively. The mixture is then compressed adiabatically to a volume of 40 cm3. Note that, in the actual operation of an automobile engine, the compression is not...
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Digital waveguide adiabatic passage part 2: experiment.

Vincent Ng, Jesse A Vaitkus, Zachary J Chaboyer

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    Summary
    This summary is machine-generated.

    We developed novel digital adiabatic passage devices using femtosecond laser writing. These devices show high fidelity operation in one scheme while suppressing another, offering potential for advanced photonic applications.

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    Area of Science:

    • Photonics
    • Quantum Optics
    • Waveguide Technology

    Background:

    • Adiabatic passage is a quantum control technique.
    • Waveguide devices are crucial for photonic integrated circuits.
    • Digital adiabatic passage offers novel control mechanisms.

    Purpose of the Study:

    • To fabricate and characterize novel three-waveguide digital adiabatic passage devices.
    • To investigate the asymmetric transmission behavior of these devices.
    • To assess the potential for low-loss adiabatic passage applications.

    Main Methods:

    • Femtosecond laser writing technique for device fabrication.
    • Characterization of three-waveguide structures with a digitized central waveguide.
    • Analysis of transmission fidelity in intuitive and counter-intuitive schemes.

    Main Results:

    • Fabrication of waveguide devices with a central waveguide digitized into five waveguidelets.
    • Observation of strongly asymmetric behavior: high fidelity in counter-intuitive scheme, suppressed transmission in intuitive scheme.
    • High contrast (>90%) operation over a 60 nm bandwidth centered at ~823 nm.

    Conclusions:

    • Digital adiabatic passage devices exhibit high fidelity and asymmetric control.
    • Low differential loss in these designs opens possibilities for new adiabatic passage functionalities.
    • The developed devices demonstrate robust performance over a significant bandwidth.