Patents by Inventor Bahaa E A. Saleh
Bahaa E A. Saleh 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).
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Patent number: 11962690Abstract: A quantum key distribution system may include a transceiver including a state randomizer to impart a random state transformation to one or more qubits of a generated faint pulse and a quantum bit encoder to reflect the faint pulse back to the transceiver with one or more encoded bits. The transceiver may receive a return pulse through the communication channel, where the state randomizer reverses the random state transformation. The transceiver may include three or more detectors to measure the return pulse at time-gated timeslots associated with possible paths of the return pulse. Reception of the faint pulse from the quantum bit encoder as the return pulse triggers a detector in a first known subset of the detectors, while reception of a faked-state pulse from a third party as the return pulse results in a non-zero probability of triggering of a detector in a second known subset of the detectors.Type: GrantFiled: January 5, 2023Date of Patent: April 16, 2024Assignee: University of Central Florida Research Foundation, Inc.Inventors: Salem F. Hegazy, Bahaa E. A. Saleh
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Publication number: 20240039712Abstract: A quantum key distribution system may include a transceiver including a state randomizer to impart a random state transformation to one or more qubits of a generated faint pulse and a quantum bit encoder to reflect the faint pulse back to the transceiver with one or more encoded bits. The transceiver may receive a return pulse through the communication channel, where the state randomizer reverses the random state transformation. The transceiver may include three or more detectors to measure the return pulse at time-gated timeslots associated with possible paths of the return pulse. Reception of the faint pulse from the quantum bit encoder as the return pulse triggers a detector in a first known subset of the detectors, while reception of a faked-state pulse from a third party as the return pulse results in a non-zero probability of triggering of a detector in a second known subset of the detectors.Type: ApplicationFiled: January 5, 2023Publication date: February 1, 2024Inventors: Salem F. Hegazy, Bahaa E. A. Saleh
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Patent number: 6982822Abstract: An apparatus for generating a strong source of doubly or multiply entangled photons emitted non-collinearly or collinearly with respect to the pump light that is at frequency 2f includes a laser medium producing classical laser light at fundamental frequency f. A medium for second harmonic generation transforms the light at fundamental frequency f to its second-harmonic frequency 2f and emitting entangled photons non-colinearly with respect to the light at the second harmonic frequency. An optical cavity element around the laser medium and the medium for second harmonic generation includes of at least two mirrors that are highly reflective at the light frequencies f and 2f.Type: GrantFiled: May 22, 2003Date of Patent: January 3, 2006Assignees: Trustees of Boston University, The Trustees of Boston College, Carl Zeiss Jena GmbHInventors: Malvin C. Teich, Bahaa E. A. Saleh, Alexander V. Sergienko, John T. Fourkas, Ralf Wolleschensky, Michael Kempe, Mark C. Booth
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Patent number: 6882431Abstract: The disclosed Quantum Optical Coherence Tomography apparatus and method includes a source of quantum entangled photons and a quantum interference device. The pair of entangled photons is divided into two beams, one of which illuminates a semi-reflective object and the second of which is reflected from a variable optical time-delay element (VTE). The VTE is scanned and the quantum interference in the QID is recorded to build up a reflectance profile of the object. A real scanning produces a full tomographic reflectance image. A method of processing the data to eliminate the effects of optical dispersion is disclosed.Type: GrantFiled: November 26, 2002Date of Patent: April 19, 2005Inventors: Malvin C. Teich, Bahaa E A. Saleh, Alexander V. Sergienko, Ayman F. Abouraddy, Magued B. Nasr
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Patent number: 6822739Abstract: A system for obtaining ellipsometric data from a sample. The system includes a source for providing a monochromatic light beam. The system also includes a nonlinear crystal for converting the monochromatic light beam into photon pairs by disintegrating photons from the monochromatic light beam, such that each of the photon pairs exhibits entanglement properties, wherein one of the photons of the pair is directed to the sample and the other of the photons of the pair is not directed to the sample. The system further includes a circuit for calculating the coincidence of one of the photons of the photon pair reflected from the sample and the other of the photons of the photon pair, wherein the measurements of the sample are obtained by analyzing the coincidence and the entanglement properties between one of the photons of the photon pair reflected from the sample and the other of the photons of the photon pair.Type: GrantFiled: May 20, 2003Date of Patent: November 23, 2004Assignee: Trustees of Boston UniversityInventors: Alexander V. Sergienko, Bahaa E. A. Saleh, Malvin C. Teich, Kimani C. Toussaint, Jr., Ayman F. Abouraddy
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Publication number: 20040100637Abstract: The disclosed Quantum Optical Coherence Tomography apparatus and method includes a source of quantum entangled photons and a quantum interference device. The pair of entangled photons is divided into two beams, one of which illuminates a semi-reflective object and the second of which is reflected from a variable optical time-delay element (VTE). The VTE is scanned and the quantum interference in the QID is recorded to build up a reflectance profile of the object. Areal scanning produces a full tomographic reflectance image. A method of processing the data to eliminate the effects of optical dispersion is disclosed.Type: ApplicationFiled: November 26, 2002Publication date: May 27, 2004Applicant: Twin Photon, Inc.Inventors: Malvin C. Teich, Bahaa E. A. Saleh, Alexander V. Sergienko, Ayman F. Abouraddy, Magued B. Nasr
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Publication number: 20040042513Abstract: The present invention relates to a novel and useful way of generating a strong source of doubly or multiply entangled photons. To generate a high flux of such photons we propose the use of a parametric process, or a set of simultaneous parametric processes, in conjunction with laser-type action and nonlinear optical processes in an optical cavity. This can be achieved via an optical-system configuration in which two, three or more processes take place simultaneously: the generation of light by stimulated emission or other means from an active medium in a cavity; the nonlinear-optical production of higher optical harmonics in the same or in an auxiliary cavity; and the generation of spontaneous parametric downconversion in the same or in an auxiliary cavity.Type: ApplicationFiled: May 22, 2003Publication date: March 4, 2004Inventors: Malvin C. Teich, Bahaa E.A. Saleh, Alexander V. Sergienko, John T. Fourkas, Ralf Wolleschensky, Michael Kempe, Mark C. Booth
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Publication number: 20040036877Abstract: A system for obtaining ellipsometric data from a sample. The system includes a source for providing a monochromatic light beam. The system also includes a nonlinear crystal for converting the monochromatic light beam into photon pairs by disintegrating photons from the monochromatic light beam, such that each of the photon pairs exhibits entanglement properties, wherein one of the photons of the pair is directed to the sample and the other of the photons of the pair is not directed to the sample. The system further includes a circuit for calculating the coincidence of one of the photons of the photon pair reflected from the sample and the other of the photons of the photon pair, wherein the measurements of the sample are obtained by analyzing the coincidence and the entanglement properties between one of the photons of the photon pair reflected from the sample and the other of the photons of the photon pair.Type: ApplicationFiled: May 20, 2003Publication date: February 26, 2004Inventors: Alexander V. Sergienko, Bahaa E.A. Saleh, Malvin C. Teich, Kimani C. Toussaint, Ayman F. Abouraddy
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Patent number: 6646727Abstract: The invention relates to an entangled-photon apparatus capable of measuring particular characteristics of an optical element, device or channel. Specifically, the apparatus and a method of using said apparatus to measure polarization mode dispersion in an optical communications fiber is disclosed. The apparatus includes a source of entangled photons, which are injected into the device under test, and a quantum interference device for determining the state of entanglement of said photons after they pass through the device. The quantum interference device includes a variable, polarization-specific delay element that is incremented to null out polarization mode dispersion in the device under test, and a wavelength demultiplexer/array detector that permits simultaneous measurements across a wide wavelength band. A second preferred embodiment of the invention and method is suitable for characterizing PMD in-situ that is, PMD measurements can be made while an optical fiber is in use for optical communications.Type: GrantFiled: May 16, 2002Date of Patent: November 11, 2003Inventors: Bahaa E. A. Saleh, Malvin C. Teich, Alexander Sergienko, Steven J. Bielagus, Milan J. Merhar
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Publication number: 20020191176Abstract: The invention relates to an entangled-photon apparatus capable of measuring particular characteristics of an optical element, device or channel. Specifically, the apparatus and a method of using said apparatus to measure polarization mode dispersion in an optical communications fiber is disclosed. The apparatus includes a source of entangled photons, which are injected into the device under test, and a quantum interference device for determining the state of entanglement of said photons after they pass through the device. The quantum interference device includes a variable, polarization-specific delay element that is incremented to null out polarization mode dispersion in the device under test, and a wavelength demultiplexer/array detector that permits simultaneous measurements across a wide wavelength band.Type: ApplicationFiled: May 16, 2002Publication date: December 19, 2002Applicant: Twin Photon, Inc.Inventors: Bahaa E.A. Saleh, Malvin C. Teich, Alexander Sergienko, Steven J. Bielagus, Milan J. Merhar
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Publication number: 20020093632Abstract: The present invention relates to novel three-dimensional fabrication using entangled-photon lithography. The systems include a source of light that produces twin or multiply entangled photons. The systems also include optical components that direct the twin or multiply entangled photons towards an interaction region. The interaction region includes absorption means responsive to a particular range of energies, which approximately equals the sum of the energies of the entangled photons. The systems may further include fabrication means in the interaction region that are responsive to physical and/or chemical changes of material or materials in this region, including the deposition or addition of one or more species, the removal of one or more species, the combination of two or more species, and/or the conversion of one species to another.Type: ApplicationFiled: August 25, 2001Publication date: July 18, 2002Inventors: Malvin C. Teich, Bahaa E.A. Saleh, Alexander V. Sergienko, John Fourkas
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Patent number: 5796477Abstract: The present invention relates to novel entangled-photon microscopy, spectroscopy and display systems. The systems include a source of light in the form of twin or multiple entangled-photon beams. The systems also include optical components that direct the twin or multiple entangled-photon beams towards a target material. The target material includes emission or indicator means responsive to an energy, which approximately equals the sum of the energies of the entangled photons. The systems may further include imaging means that is sensitive to the response of the target material. The present invention also relates to novel correlated-photon microscopy, spectroscopy and display systems. The present invention further relates to methods of correlated-photon microscopy in which a pump beam of photons is provided. A portion of the pump beam is split into a first beam and a second beam, the beams having corresponding correlated photons.Type: GrantFiled: February 27, 1997Date of Patent: August 18, 1998Assignee: Trustees of Boston UniversityInventors: Malvin Carl Teich, Bahaa E. A. Saleh