Patents by Inventor Kin Chung Fong
Kin Chung Fong 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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Publication number: 20230358670Abstract: A single-photon-spectroscopic isotope detector. In some embodiments, the isotope detector includes a narrow-band light source, and a single-photon detector. The narrow-band light source may be configured to generate light at a first wavelength near a second wavelength corresponding to a vibrational mode of a molecule including an isotope of interest.Type: ApplicationFiled: February 9, 2023Publication date: November 9, 2023Inventor: Kin Chung FONG
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Publication number: 20230309417Abstract: A resonator constructed with one or more Van der Waals materials. In some embodiments, a system includes such a resonator. The resonator may include: a capacitor; and an inductor, the capacitor including: a first conductive layer; an insulating layer, on the first conductive layer; and a second conductive layer on the insulating layer, the first conductive layer being composed of one or more layers of a first van der Waals material, the insulating layer being composed of one or more layers of a second van der Waals material, and the second conductive layer being composed of one or more layers of a third van der Waals material.Type: ApplicationFiled: January 27, 2023Publication date: September 28, 2023Inventors: Kin Chung FONG, Guilhem Jean Antoine RIBEILL, Martin GUSTAFSSON, James Curtis HONE
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Patent number: 11721095Abstract: A method for classifying images of oligolayer exfoliation attempts. In some embodiments, the method includes forming a micrograph of a surface, and classifying the micrograph into one of a plurality of categories. The categories may include a first category, consisting of micrographs including at least one oligolayer flake, and a second category, consisting of micrographs including no oligolayer flakes, the classifying comprising classifying the micrograph with a neural network.Type: GrantFiled: November 22, 2022Date of Patent: August 8, 2023Assignee: RAYTHEON BBN TECHNOLOGIES CORP.Inventors: Kin Chung Fong, Man-Hung Siu, Zhuolin Jiang
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Publication number: 20230091882Abstract: A method for classifying images of oligolayer exfoliation attempts. In some embodiments, the method includes forming a micrograph of a surface, and classifying the micrograph into one of a plurality of categories. The categories may include a first category, consisting of micrographs including at least one oligolayer flake, and a second category, consisting of micrographs including no oligolayer flakes, the classifying comprising classifying the micrograph with a neural network.Type: ApplicationFiled: November 22, 2022Publication date: March 23, 2023Inventors: Kin Chung Fong, Man-Hung Siu, Zhuolin Jiang
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Patent number: 11592337Abstract: An evaporatively cooled device and a system including the same. In some embodiments, the system includes an oligolayer conductive sheet; a superconductor; a tunneling barrier, between the oligolayer conductive sheet and the superconductor; and a bias circuit, configured to apply a bias voltage across the tunneling barrier, the bias voltage being less than a gap voltage of the superconductor and greater than one-half of the gap voltage of the superconductor.Type: GrantFiled: August 11, 2021Date of Patent: February 28, 2023Assignees: RAYTHEON BBN TECHNOLOGIES CORP., MASSACHUSETTS INSTITUTE OF TECHNOLOGYInventors: Kin Chung Fong, Dirk Robert Englund
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Publication number: 20230015299Abstract: A van der Waals capacitor and a qubit constructed with such a capacitor. In some embodiments, the capacitor includes a first conductive layer; an insulating layer, on the first conductive layer; and a second conductive layer on the insulating layer. The first conductive layer may be composed of one or more layers of a first van der Waals material, the insulating layer may be composed of one or more layers of a second van der Waals material, and the second conductive layer may be composed of one or more layers of a third van der Waals material.Type: ApplicationFiled: March 4, 2022Publication date: January 19, 2023Inventors: Matthew Elliott WARE, Anjaly Thekkevilayil RAJENDRAN, Guilhem Jean Antoine RIBEILL, Thomas OHKI, James Curtis HONE, Martin GUSTAFSSON, Luke GOVIA, Kin Chung FONG, Abhinandan ANTONY
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Patent number: 11537822Abstract: A method for classifying images of oligolayer exfoliation attempts. In some embodiments, the method includes forming a micrograph of a surface, and classifying the micrograph into one of a plurality of categories. The categories may include a first category, consisting of micrographs including at least one oligolayer flake, and a second category, consisting of micrographs including no oligolayer flakes, the classifying comprising classifying the micrograph with a neural network.Type: GrantFiled: May 22, 2019Date of Patent: December 27, 2022Assignee: RAYTHEON BBN TECHNOLOGIES CORP.Inventors: Kin Chung Fong, Man-Hung Siu, Zhuolin Jiang
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Publication number: 20220393090Abstract: A tunable oscillator including a Josephson junction. In some embodiments, the tunable oscillator includes a first superconducting terminal, a second superconducting terminal, a graphene channel including a portion of a graphene sheet, and a conductive gate. The first superconducting terminal, the second superconducting terminal, and the graphene channel together may form a Josephson junction having an oscillation frequency, and the conductive gate may be configured, upon application of a voltage across the conductive gate and the graphene channel, to modify the oscillation frequency.Type: ApplicationFiled: August 11, 2022Publication date: December 8, 2022Inventor: Kin Chung Fong
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Patent number: 11451204Abstract: An amplifier. In some embodiments, the amplifier includes a resonant circuit having a resonant frequency, a pump input, a signal input, and a signal output. The resonant circuit may include a Josephson junction connected to the pump input, the Josephson junction being a superconducting-normal-superconducting junction having two superconducting terminals and being configured to adjust the resonant frequency of the resonant circuit based on a signal received at the pump input.Type: GrantFiled: February 20, 2020Date of Patent: September 20, 2022Assignee: Raytheon BBN Technologies CorpInventors: Kin Chung Fong, Guilhem Ribeill, Luke Colin Gene Govia, Martin Gustafsson, Thomas A. Ohki
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Patent number: 11430937Abstract: A tunable oscillator including a Josephson junction. In some embodiments, the tunable oscillator includes a first superconducting terminal, a second superconducting terminal, a graphene channel including a portion of a graphene sheet, and a conductive gate. The first superconducting terminal, the second superconducting terminal, and the graphene channel together may form a Josephson junction having an oscillation frequency, and the conductive gate may be configured, upon application of a voltage across the conductive gate and the graphene channel, to modify the oscillation frequency.Type: GrantFiled: January 12, 2021Date of Patent: August 30, 2022Assignee: Raytheon BBN Technologies Corp.Inventor: Kin Chung Fong
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Publication number: 20220223780Abstract: A tunable oscillator including a Josephson junction. In some embodiments, the tunable oscillator includes a first superconducting terminal, a second superconducting terminal, a graphene channel including a portion of a graphene sheet, and a conductive gate. The first superconducting terminal, the second superconducting terminal, and the graphene channel together may form a Josephson junction having an oscillation frequency, and the conductive gate may be configured, upon application of a voltage across the conductive gate and the graphene channel, to modify the oscillation frequency.Type: ApplicationFiled: January 12, 2021Publication date: July 14, 2022Inventor: Kin Chung Fong
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Publication number: 20220146322Abstract: An evaporatively cooled device and a system including the same. In some embodiments, the system includes an oligolayer conductive sheet; a superconductor; a tunneling barrier, between the oligolayer conductive sheet and the superconductor; and a bias circuit, configured to apply a bias voltage across the tunneling barrier, the bias voltage being less than a gap voltage of the superconductor and greater than one-half of the gap voltage of the superconductor.Type: ApplicationFiled: August 11, 2021Publication date: May 12, 2022Inventors: Kin Chung FONG, Dirk Robert Englund
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Patent number: 11156502Abstract: A system for detecting microwave power. In some embodiments, the system includes: a first resonator including a graphene-insulating-superconducting junction; a probe signal source, coupled to the first resonator; and a probe signal analyzer. The probe signal analyzer is configured: to measure a change in amplitude or phase of a probe signal received by the probe signal analyzer from the probe signal source, and to infer, from the change in amplitude or phase, a change in microwave power received by the graphene-insulating-superconducting junction.Type: GrantFiled: March 20, 2020Date of Patent: October 26, 2021Assignee: Raytheon BBN Technologies Corp.Inventors: Kin Chung Fong, Leonardo Ranzani
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Publication number: 20200363267Abstract: A system for detecting microwave power. In some embodiments, the system includes: a first resonator including a graphene-insulating-superconducting junction; a probe signal source, coupled to the first resonator; and a probe signal analyzer. The probe signal analyzer is configured: to measure a change in amplitude or phase of a probe signal received by the probe signal analyzer from the probe signal source, and to infer, from the change in amplitude or phase, a change in microwave power received by the graphene-insulating-superconducting junction.Type: ApplicationFiled: March 20, 2020Publication date: November 19, 2020Inventors: Kin Chung Fong, Leonardo Ranzani
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Patent number: 10784433Abstract: A transistor. In some embodiments, the transistor includes a first superconducting source-drain, a second superconducting source-drain, a graphene channel including at least a portion of a graphene sheet, and a conductive gate. The first superconducting source-drain, the second superconducting source-drain, and the graphene channel together form a Josephson junction having a critical current. The graphene channel forms a current path between the first superconducting source-drain and the second superconducting source-drain. The conductive gate is configured, upon application of a electric field across the conductive gate and the graphene channel by applying a voltage, to modify the critical current.Type: GrantFiled: March 12, 2019Date of Patent: September 22, 2020Assignee: Raytheon BBN Technologies CorpInventors: Kin Chung Fong, Thomas A. Ohki
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Publication number: 20200274507Abstract: An amplifier. In some embodiments, the amplifier includes a resonant circuit having a resonant frequency, a pump input, a signal input, and a signal output. The resonant circuit may include a Josephson junction connected to the pump input, the Josephson junction being a superconducting-normal-superconducting junction having two superconducting terminals and being configured to adjust the resonant frequency of the resonant circuit based on a signal received at the pump input.Type: ApplicationFiled: February 20, 2020Publication date: August 27, 2020Inventors: Kin Chung Fong, Guilhem Ribeill, Luke Colin Gene Govia, Martin Gustafsson, Thomas A. Ohki
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Publication number: 20190362194Abstract: A method for classifying images of oligolayer exfoliation attempts. In some embodiments, the method includes forming a micrograph of a surface, and classifying the micrograph into one of a plurality of categories. The categories may include a first category, consisting of micrographs including at least one oligolayer flake, and a second category, consisting of micrographs including no oligolayer flakes, the classifying comprising classifying the micrograph with a neural network.Type: ApplicationFiled: May 22, 2019Publication date: November 28, 2019Inventors: Kin Chung Fong, Man-Hung Siu, Zhuolin Jiang
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Patent number: 10454016Abstract: A photon detector including a graphene-insulating-superconducting junction configured as a temperature sensor. Photons are absorbed by the graphene sheet of the graphene-insulating-superconducting junction, each absorbed photon causing a temporary increase in the temperature of the graphene sheet, and a corresponding change in the differential impedance of the graphene-insulating-superconducting junction. The graphene-insulating-superconducting junction is part of a resonant circuit connected as a shunt load between a radio frequency input transmission line and a radio frequency output transmission line. The transmission S-parameter from input to output is affected by the impedance of the resonant circuit which in turn is affected by the differential impedance of the graphene-insulating-superconducting junction, and therefore by the temperature of the graphene sheet.Type: GrantFiled: May 18, 2018Date of Patent: October 22, 2019Assignee: Raytheon BBN Technologies Corp.Inventors: Kin Chung Fong, Thomas A. Ohki
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Publication number: 20190288177Abstract: A transistor. In some embodiments, the transistor includes a first superconducting source-drain, a second superconducting source-drain, a graphene channel including at least a portion of a graphene sheet, and a conductive gate. The first superconducting source-drain, the second superconducting source-drain, and the graphene channel together form a Josephson junction having a critical current. The graphene channel forms a current path between the first superconducting source-drain and the second superconducting source-drain. The conductive gate is configured, upon application of a electric field across the conductive gate and the graphene channel by applying a voltage, to modify the critical current.Type: ApplicationFiled: March 12, 2019Publication date: September 19, 2019Inventors: Kin Chung Fong, Thomas A. Ohki
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Publication number: 20180356289Abstract: A bolometer. In one embodiment a graphene sheet is configured to absorb electromagnetic waves. The graphene sheet has two contacts connected to an amplifier, and a power detector connected to the amplifier. Electromagnetic power in the evanescent electromagnetic waves is absorbed in the graphene sheet, heating the graphene sheet. The power of Johnson noise generated at the contacts is proportional to the temperature of the graphene sheet. The Johnson noise is amplified and the power in the Johnson noise is used as a measure of the temperature of the graphene sheet, and of the amount of electromagnetic wave power absorbed by the graphene sheet.Type: ApplicationFiled: June 6, 2018Publication date: December 13, 2018Inventor: Kin Chung Fong