Patents by Inventor Nicholas C. Harris

Nicholas C. Harris 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).

  • Patent number: 10740693
    Abstract: Methods and apparatus for training a matrix-based differentiable program using a photonics-based processor. The matrix-based differentiable program includes at least one matrix-valued variable associated with a matrix of values in a Euclidean vector space. The method comprises configuring components of the photonics-based processor to represent the matrix of values as an angular representation, processing, using the components of the photonics-based processor, training data to compute an error vector, determining in parallel, at least some gradients of parameters of the angular representation, wherein the determining is based on the error vector and a current input training vector, and updating the matrix of values by updating the angular representation based on the determined gradients.
    Type: Grant
    Filed: May 14, 2019
    Date of Patent: August 11, 2020
    Assignee: Lightmatter, Inc.
    Inventors: Tomo Lazovich, Darius Bunandar, Nicholas C. Harris, Martin Forsythe
  • Publication number: 20200228077
    Abstract: Low-noise optical differential receivers are described. Such differential receivers may include a differential amplifier having first and second inputs and first and second outputs, and four photodetectors. A first and a second of such photodetectors are coupled to the first input of the differential amplifier, and a third and a fourth of such photodetectors are coupled to the second input of the differential amplifier. The anode of the first photodetector and the cathode of the second photodetector are coupled to the first input of the differential amplifier. The cathode of the third photodetector and the anode of the fourth photodetector are coupled to the second input of the differential amplifier. The optical receiver may involve two stages of signal subtraction, which may significantly increase noise immunity.
    Type: Application
    Filed: May 14, 2019
    Publication date: July 16, 2020
    Applicant: Lightmatter, Inc.
    Inventors: Nicholas C. Harris, Michael Gould, Omer Ozgur Yildirim
  • Publication number: 20200150511
    Abstract: Typically, quantum systems are very sensitive to environmental fluctuations, and diagnosing errors via measurements causes unavoidable perturbations. Here, an in situ frequency-locking technique monitors and corrects frequency variations in single-photon sources based on resonators. By using the classical laser fields used for photon generation as probes to diagnose variations in the resonator frequency, the system applies feedback control to correct photon frequency errors in parallel to the optical quantum computation without disturbing the physical qubit. Our technique can be implemented on a silicon photonic device and with sub 1 pm frequency stabilization in the presence of applied environmental noise, corresponding to a fractional frequency drift of <1% of a photon linewidth. These methods can be used for feedback-controlled quantum state engineering.
    Type: Application
    Filed: November 12, 2019
    Publication date: May 14, 2020
    Inventors: Jacques Johannes Carolan, Uttara Chakraborty, Nicholas C. HARRIS, Mihir PANT, Dirk Robert ENGLUND
  • Publication number: 20200142441
    Abstract: Systems and methods for performing matrix operations using a photonic processor are provided. The photonic processor includes encoders configured to encode a numerical value into an optical signal and optical multiplication devices configured to output an electrical signal proportional to a product of one or more encoded values. The optical multiplication devices include a first input waveguide, a second input waveguide, a coupler circuit coupled to the first input waveguide and the second input waveguide, a first detector and a second detector coupled to the coupler circuit, and a circuit coupled to the first detector and second detector and configured to output a current that is proportional to a product of a first input value and a second input value.
    Type: Application
    Filed: November 1, 2019
    Publication date: May 7, 2020
    Applicant: Lightmatter, Inc.
    Inventors: Darius Bunandar, Nicholas C. Harris, Tyler Kenney
  • Publication number: 20200116930
    Abstract: Photonic packages are described. One such photonic package includes a photonic chip, an application specific integrated circuit, and optionally, an interposer. The photonic chip includes photonic microelectromechanical system (MEMS) devices. A photonic package may include a material layer patterned to include recesses. The recesses are aligned with the photonic MEMS devices so as to form enclosed cavities around the photonic MEMS devices. This arrangement preserves the integrity of the photonic MEMS devices.
    Type: Application
    Filed: October 15, 2019
    Publication date: April 16, 2020
    Applicant: Lightmatter, Inc.
    Inventors: Sukeshwar Kannan, Carl Ramey, Michael Gould, Nicholas C. Harris
  • Patent number: 10619993
    Abstract: A programmable photonic integrated circuit implements arbitrary linear optics transformations in the spatial mode basis with high fidelity. Under a realistic fabrication model, we analyze programmed implementations of the CNOT gate, CPHASE gate, iterative phase estimation algorithm, state preparation, and quantum random walks. We find that programmability dramatically improves device tolerance to fabrication imperfections and enables a single device to implement a broad range of both quantum and classical linear optics experiments. Our results suggest that existing fabrication processes are sufficient to build such a device in the silicon photonics platform.
    Type: Grant
    Filed: June 6, 2019
    Date of Patent: April 14, 2020
    Assignee: Massachusetts Institute of Technology
    Inventors: Jacob C. Mower, Nicholas C. Harris, Dirk Englund, Greg Steinbrecher
  • Patent number: 10608663
    Abstract: Optical encoders for encoding signed, real numbers using optical fields are described. The optical fields may be detected using coherent detection, without the need for independent phase and amplitude control. This encoding technique enables the use of simple and non-ideal modulators (e.g., modulators that provide neither pure phase nor pure amplitude modulation) for high-precision encoding. A photonic system implementing optical encoding techniques may include a modulator configured to be driven by a single electrical modulating signal and a coherent receiver. An optical transformation unit optically coupled between the modulator and the coherent receiver may transform the phase and/or the intensity of the modulated optical field. The optical encoding techniques described herein may be used in a variety of contexts, including high-speed telecommunications, on chip-phase sensitive measurements for sensing, communications and computing, and optical machine learning.
    Type: Grant
    Filed: May 14, 2019
    Date of Patent: March 31, 2020
    Assignee: Lightmatter, Inc.
    Inventors: Michael Gould, Darius Bunandar, Shashank Gupta, Nicholas C. Harris
  • Publication number: 20190372589
    Abstract: Optical encoders for encoding signed, real numbers using optical fields are described. The optical fields may be detected using coherent detection, without the need for independent phase and amplitude control. This encoding technique enables the use of simple and non-ideal modulators (e.g., modulators that provide neither pure phase nor pure amplitude modulation) for high-precision encoding. A photonic system implementing optical encoding techniques may include a modulator configured to be driven by a single electrical modulating signal and a coherent receiver. An optical transformation unit optically coupled between the modulator and the coherent receiver may transform the phase and/or the intensity of the modulated optical field. The optical encoding techniques described herein may be used in a variety of contexts, including high-speed telecommunications, on chip-phase sensitive measurements for sensing, communications and computing, and optical machine learning.
    Type: Application
    Filed: May 14, 2019
    Publication date: December 5, 2019
    Applicant: Lighmatter, Inc.
    Inventors: Michael Gould, Darius Bunandar, Shashank Gupta, Nicholas C. Harris
  • Publication number: 20190354894
    Abstract: Methods and apparatus for training a matrix-based differentiable program using a photonics-based processor. The matrix-based differentiable program includes at least one matrix-valued variable associated with a matrix of values in a Euclidean vector space. The method comprises configuring components of the photonics-based processor to represent the matrix of values as an angular representation, processing, using the components of the photonics-based processor, training data to compute an error vector, determining in parallel, at least some gradients of parameters of the angular representation, wherein the determining is based on the error vector and a current input training vector, and updating the matrix of values by updating the angular representation based on the determined gradients.
    Type: Application
    Filed: May 14, 2019
    Publication date: November 21, 2019
    Applicant: Lightmatter, Inc
    Inventors: Tomo Lazovich, Darius Bunandar, Nicholas C. Harris, Martin Forsythe
  • Publication number: 20190356394
    Abstract: Aspects relate to a photonic processing system, a photonic processor, and a method of performing matrix-vector multiplication. An optical encoder may encode an input vector into a first plurality of optical signals. A photonic processor may receive the first plurality of optical signals; perform a plurality of operations on the first plurality of optical signals, the plurality of operations implementing a matrix multiplication of the input vector by a matrix; and output a second plurality of optical signals representing an output vector. An optical receiver may detect the second plurality of optical signals and output an electrical digital representation of the output vector.
    Type: Application
    Filed: May 14, 2019
    Publication date: November 21, 2019
    Inventors: Darius Bunandar, Nicholas C. Harris, Carl Ramey
  • Publication number: 20190310070
    Abstract: A programmable photonic integrated circuit implements arbitrary linear optics transformations in the spatial mode basis with high fidelity. Under a realistic fabrication model, we analyze programmed implementations of the CNOT gate, CPHASE gate, iterative phase estimation algorithm, state preparation, and quantum random walks. We find that programmability dramatically improves device tolerance to fabrication imperfections and enables a single device to implement a broad range of both quantum and classical linear optics experiments. Our results suggest that existing fabrication processes are sufficient to build such a device in the silicon photonics platform.
    Type: Application
    Filed: June 6, 2019
    Publication date: October 10, 2019
    Inventors: JACOB C. MOWER, Nicholas C. HARRIS, DIRK ENGLUND, GREG STEINBRECHER
  • Patent number: 10359272
    Abstract: A programmable photonic integrated circuit implements arbitrary linear optics transformations in the spatial mode basis with high fidelity. Under a realistic fabrication model, we analyze programmed implementations of the CNOT gate, CPHASE gate, iterative phase estimation algorithm, state preparation, and quantum random walks. We find that programmability dramatically improves device tolerance to fabrication imperfections and enables a single device to implement a broad range of both quantum and classical linear optics experiments. Our results suggest that existing fabrication processes are sufficient to build such a device in the silicon photonics platform.
    Type: Grant
    Filed: September 26, 2017
    Date of Patent: July 23, 2019
    Assignee: MASSACHUSETTS INSTITUTE OF TECHNOLOGY
    Inventors: Jacob C. Mower, Nicholas C. Harris, Dirk R. Englund, Greg Steinbrecher
  • Patent number: 10158481
    Abstract: Systems, apparatus, and methods using an integrated photonic chip capable of operating at rates higher than a Gigahertz for quantum key distribution are disclosed. The system includes two identical transmitter chips and one receiver chip. The transmitter chips encode photonic qubits by modulating phase-randomized attenuated laser light within two early or late time-bins. Each transmitter chip can produce a single-photon pulse either in one of the two time-bins or as a superposition of the two time-bins with or without any phase difference. The pulse modulation is achieved using ring resonators, and the phase difference between the two time-bins is obtained using thermo-optic phase shifters and/or time delay elements. The receiver chip employs either homodyne detection or heterodyne detection to perform Bell measurements.
    Type: Grant
    Filed: June 10, 2016
    Date of Patent: December 18, 2018
    Assignee: Massachusetts Institute of Technology
    Inventors: Darius Bunandar, Nicholas C. Harris, Dirk Robert Englund
  • Publication number: 20180274900
    Abstract: A programmable photonic integrated circuit implements arbitrary linear optics transformations in the spatial mode basis with high fidelity. Under a realistic fabrication model, we analyze programmed implementations of the CNOT gate, CPHASE gate, iterative phase estimation algorithm, state preparation, and quantum random walks. We find that programmability dramatically improves device tolerance to fabrication imperfections and enables a single device to implement a broad range of both quantum and classical linear optics experiments. Our results suggest that existing fabrication processes are sufficient to build such a device in the silicon photonics platform.
    Type: Application
    Filed: September 26, 2017
    Publication date: September 27, 2018
    Inventors: Jacob C. Mower, Nicholas C. Harris, Dirk R. Englund, Greg Steinbrecher
  • Patent number: 9791258
    Abstract: A programmable photonic integrated circuit implements arbitrary linear optics transformations in the spatial mode basis with high fidelity. Under a realistic fabrication model, we analyze programmed implementations of the CNOT gate, CPHASE gate, iterative phase estimation algorithm, state preparation, and quantum random walks. We find that programmability dramatically improves device tolerance to fabrication imperfections and enables a single device to implement a broad range of both quantum and classical linear optics experiments. Our results suggest that existing fabrication processes are sufficient to build such a device in the silicon photonics platform.
    Type: Grant
    Filed: April 29, 2016
    Date of Patent: October 17, 2017
    Assignee: Massachusetts Institute of Technology
    Inventors: Jacob C. Mower, Nicholas C. Harris, Dirk R. Englund, Greg Steinbrecher
  • Publication number: 20160245639
    Abstract: A programmable photonic integrated circuit implements arbitrary linear optics transformations in the spatial mode basis with high fidelity. Under a realistic fabrication model, we analyze programmed implementations of the CNOT gate, CPHASE gate, iterative phase estimation algorithm, state preparation, and quantum random walks. We find that programmability dramatically improves device tolerance to fabrication imperfections and enables a single device to implement a broad range of both quantum and classical linear optics experiments. Our results suggest that existing fabrication processes are sufficient to build such a device in the silicon photonics platform.
    Type: Application
    Filed: April 29, 2016
    Publication date: August 25, 2016
    Inventors: Jacob C. Mower, Nicholas C. Harris, Dirk R. Englund, Greg Steinbrecher
  • Patent number: 9354039
    Abstract: A programmable photonic integrated circuit implements arbitrary linear optics transformations in the spatial mode basis with high fidelity. Under a realistic fabrication model, we analyze programmed implementations of the CNOT gate, CPHASE gate, iterative phase estimation algorithm, state preparation, and quantum random walks. We find that programmability dramatically improves device tolerance to fabrication imperfections and enables a single device to implement a broad range of both quantum and classical linear optics experiments. Our results suggest that existing fabrication processes are sufficient to build such a device in the silicon photonics platform.
    Type: Grant
    Filed: June 5, 2015
    Date of Patent: May 31, 2016
    Assignee: Massachusetts Institute of Technology
    Inventors: Jacob C. Mower, Nicholas C. Harris, Dirk R. Englund, Greg Steinbrecher
  • Publication number: 20150354938
    Abstract: A programmable photonic integrated circuit implements arbitrary linear optics transformations in the spatial mode basis with high fidelity. Under a realistic fabrication model, we analyze programmed implementations of the CNOT gate, CPHASE gate, iterative phase estimation algorithm, state preparation, and quantum random walks. We find that programmability dramatically improves device tolerance to fabrication imperfections and enables a single device to implement a broad range of both quantum and classical linear optics experiments. Our results suggest that existing fabrication processes are sufficient to build such a device in the silicon photonics platform.
    Type: Application
    Filed: June 5, 2015
    Publication date: December 10, 2015
    Inventors: Jacob C. Mower, Nicholas C. Harris, Dirk R. Englund, Greg Steinbrecher