Patents by Inventor Daniel F. Walls

Daniel F. Walls has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Device and method for quantum nondemolition measurements using parametric oscillation
    Patent number: 4944592
    Abstract: Quantum nondemolition measurements are made by back-action evasion obtained by a combination of a parametric oscillation and a conversion of polarizations. A polarization converter (14, 16, 17), such as a Faraday rotator, converts at substantially a single frequency between at least a portion of a signal polarization state and a detector polarization state. A parametric amplifier (11) having a gain G is coupled to the polarization converter (14, 16, 17).
    Type: Grant
    Filed: April 4, 1989
    Date of Patent: July 31, 1990
    Assignee: The University of Texas System
    Inventors: Harry J. Kimble, Silvania F. Pereira, Daniel F. Walls