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    TELEPORTATION SYSTEMS TOWARD A QUANTUM INTERNET
    1.
    发明公开
    TELEPORTATION SYSTEMS TOWARD A QUANTUM INTERNET 审中-公开

    公开(公告)号：US20240275494A1

    公开(公告)日：2024-08-15

    申请号：US18073245

    申请日：2022-12-01

    Applicant: California Institute of Technology

    Inventor： Maria Spiropulu ,  Venkata Ramana Raju Valivarthi

    IPC: H04B10/70 ,  H04B10/079 ,  H04L7/00

    CPC classification number: H04B10/70 ,  H04B10/0795 ,  H04L7/0075

    Abstract: Quantum teleportation is essential for many quantum information technologies, including long-distance quantum networks. Using fiber-coupled devices, including state-of-the-art low-noise superconducting nanowire single-photon detectors and off-the-shelf optics, we achieve conditional quantum teleportation of time-bin qubits at the telecommunication wavelength of 1536.5 nm. We measure teleportation fidelities of ≥9% that are consistent with an analytical model of our system, which includes realistic imperfections. To demonstrate the compatibility of our setup with deployed quantum networks, we teleport qubits over 22 km of single-mode fiber while transmitting qubits over an additional 22 km of fiber. Our systems, which are compatible with emerging solid-state quantum devices, provide a realistic foundation for a high-fidelity quantum Internet with practical devices.

    Thin film electret microphone
    2.
    发明申请
    Thin film electret microphone 失效
    薄膜驻极体麦克风

    公开(公告)号：US20010033670A1

    公开(公告)日：2001-10-25

    申请号：US09859191

    申请日：2001-05-15

    Applicant: California Institute of Technology a California Institute of Technology

    Inventor： Yu-Chong Tai ,  Tseng-Yang Hsu ,  Wen H. Hsieh

    IPC: H04R017/00 ,  H04R025/00

    CPC classification number: H04R19/016 ,  H04R25/604 ,  Y10T29/42 ,  Y10T29/49005 ,  Y10T29/49226

    Abstract: An electret formed by micro-machining technology on a support surface, including a self-powered electret sound transducer, preferably in the form of a microphone, formed by micro-machining technology. Each microphone is manufactured as a two-piece unit, comprising a microphone membrane unit and a microphone back plate, at least one of which includes an electret formed by micro-machining technology. When juxtaposed, the two units form a microphone that can produce a signal without the need for external biasing, thereby reducing system volume and complexity. The electret material used is a thin film of spin-on polytetrafluoroethylene (PTFE). An electron gun preferably is used for charge implantation. The electret has a saturated charged density in the range of about 2null10null5 C/m2 to about 8null10null4 C/m2. Thermal annealing is used to stabilize the implanted charge. An open circuit sensitivity of about 0.5 mV/Pa has been achieved for a hybrid microphone package.

    Abstract translation: 通过微加工技术在支撑表面上形成的驻极体，其包括通过微加工技术形成的优选以麦克风形式的自供电的驻极体声音传感器。 每个麦克风被制造成两件式的单元，其包括麦克风膜单元和麦克风背板，其中至少一个包括由微加工技术形成的驻极体。 当并置时，两个单元形成麦克风，其可以产生信号而不需要外部偏置，从而降低系统体积和复杂性。 使用的驻极体材料是旋涂聚四氟乙烯（PTFE）的薄膜。 电子枪优选用于电荷注入。 驻极体的饱和带电密度在约2×10 -5 C / m 2至约8×10 -4 C / m 2的范围内。 热退火用于稳定植入电荷。 对于混合麦克风封装已经实现了约0.5mV / Pa的开路灵敏度。

    Systems and Methods for Communicating by Modulating Data on Zeros
    3.
    发明申请
    Systems and Methods for Communicating by Modulating Data on Zeros 有权

    公开(公告)号：US20250168048A1

    公开(公告)日：2025-05-22

    申请号：US18957569

    申请日：2024-11-22

    Applicant: California Institute of Technology ,  MOXZ GmbH

    Inventor： Philipp Walk ,  Babak Hassibi ,  Peter Jung

    IPC: H04L27/26 ,  H04J11/00 ,  H04L25/02

    Abstract: Systems and methods for transmitting data using various Modulation on Zeros schemes are described. In many embodiments, a communication system is utilized that includes a transmitter having a modulator that modulates a plurality of information bits to encode the bits in the zeros of the z-transform of a discrete-time baseband signal. In addition, the communication system includes a receiver having a decoder configured to decode a plurality of bits of information from the samples of a received signal by: determining a plurality of zeros of a z-transform of a received discrete-time baseband signal based upon samples from a received continuous-time signal, identifying zeros that encode the plurality of information bits, and outputting a plurality of decoded information bits based upon the identified zeros.

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