Patents by Inventor Lohrmann ALEXANDER

Lohrmann ALEXANDER 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).

  • Method and system for converting position or momentum correlation of photon pairs to a polarization entangled photon pair
    Patent number: 11586093
    Abstract: A method of, and module for, converting position or momentum correlation of correlated photon pairs to a polarization entangled photon pair, and a source for polarization entangled photon pairs. The method comprises a conversion step of separating the correlated photon pairs into first and second groups based on their generated position at the crystal (position correlation) or their direction about the propagation axis (momentum correlation) and rotating a polarization of the first correlated photon pair group such that the polarization of the first correlated pair group is at 90 degrees relative to the polarization of the second correlated photon pair group; and a combining step of combining the first and second correlated photon pairs such that at least respective portions of respective spatial distributions of the first and second photon pair groups overlap with negligible wavelength dependent phase difference.
    Type: Grant
    Filed: October 4, 2019
    Date of Patent: February 21, 2023
    Assignee: NATIONAL UNIVERSITY OF SINGAPORE
    Inventors: Chithrabhanu Perumangatt, Lohrmann Alexander, Alexander Ling
  • A METHOD AND SYSTEM FOR CONVERTING POSITION OR MOMENTUM CORRELATION OF PHOTON PAIRS TO A POLARIZATION ENTANGLED PHOTON PAIR
    Publication number: 20220206360
    Abstract: A method of, and module for, converting position or momentum correlation of correlated photon pairs to a polarization entangled photon pair, and a source for polarization entangled photon pairs. The method comprises a conversion step of separating the correlated photon pairs into first and second groups based on their generated position at the crystal (position correlation) or their direction about the propagation axis (momentum correlation) and rotating a polarization of the first correlated photon pair group such that the polarization of the first correlated pair group is at 90 degrees relative to the polarization of the second correlated photon pair group; and a combining step of combining the first and second correlated photon pairs such that at least respective portions of respective spatial distributions of the first and second photon pair groups overlap with negligible wavelength dependent phase difference.
    Type: Application
    Filed: October 4, 2019
    Publication date: June 30, 2022
    Applicant: NATIONAL UNIVERSITY OF SINGAPORE
    Inventors: Chithrabhanu PERUMANGATT, Lohrmann ALEXANDER, Alexander LING