Patents by Inventor Hyeongrak CHOI
Hyeongrak CHOI 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: 20240078462Abstract: Quantum information processing involves entangling large numbers of qubits, which can be realized as defect centers in a solid-state host. The qubits can be implemented as individual unit cells, each with its own control electronics, that are arrayed in a cryostat. Free-space control and pump beams address the qubit unit cells through a cryostat window. The qubit unit cells emit light in response to these control and pump beams and microwave pulses applied by the control electronics. The emitted light propagates through free space to a mode mixer, which interferes the optical modes from adjacent qubit unit cells for heralded Bell measurements. The qubit unit cells are small (e.g., 10 ?m square), so they can be tiled in arrays of up to millions, addressed by free-space optics with micron-scale spot sizes. The processing overhead for this architecture remains relatively constant, even with large numbers of qubits, enabling scalable large-scale quantum information processing.Type: ApplicationFiled: October 24, 2023Publication date: March 7, 2024Applicant: Massachusetts Institute of TechnologyInventors: Hyeongrak CHOI, Dirk Robert ENGLUND
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Patent number: 11853847Abstract: Quantum information processing involves entangling large numbers of qubits, which can be realized as defect centers in a solid-state host. The qubits can be implemented as individual unit cells, each with its own control electronics, that are arrayed in a cryostat. Free-space control and pump beams address the qubit unit cells through a cryostat window. The qubit unit cells emit light in response to these control and pump beams and microwave pulses applied by the control electronics. The emitted light propagates through free space to a mode mixer, which interferes the optical modes from adjacent qubit unit cells for heralded Bell measurements. The qubit unit cells are small (e.g., 10 ?m square), so they can be tiled in arrays of up to millions, addressed by free-space optics with micron-scale spot sizes. The processing overhead for this architecture remains relatively constant, even with large numbers of qubits, enabling scalable large-scale quantum information processing.Type: GrantFiled: August 17, 2020Date of Patent: December 26, 2023Assignee: Massachusetts Institute of TechnologyInventors: Hyeongrak Choi, Dirk Robert Englund
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Patent number: 11626227Abstract: Using the Meissner effect in superconductors, demonstrated here is the capability to create an arbitrarily high magnetic flux density (also sometimes referred to as “flux squeezing”). This technique has immediate applications for numerous technologies. For example, it allows the generation of very large magnetic fields (e.g., exceeding 1 Tesla) for nuclear magnetic resonance (NMR), magnetic resonance imaging (MRI), the generation of controlled magnetic fields for advanced superconducting quantum computing devices, and/or the like. The magnetic field concentration/increased flux density approaches can be applied to both static magnetic fields (i.e., direct current (DC) magnetic fields) and time-varying magnetic fields (i.e., alternating current (AC) magnetic fields) up to microwave frequencies.Type: GrantFiled: June 22, 2020Date of Patent: April 11, 2023Assignee: Massachusetts Institute of TechnologyInventors: Hyeongrak Choi, Dirk Robert Englund
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Publication number: 20230059700Abstract: Disclosed are dielectric cavity arrays with cavities formed by pairs of dielectric tips, wherein the cavities have low mode volume (e.g., 7*10?5 ?3, where ? is the resonance wavelength of the cavity array), and large quality factor Q (e.g., 106 or more). Applications for such dielectric cavity arrays include, but are not limited to, Raman spectroscopy, second harmonic generation, optical signal detection, microwave-to-optical transduction, and as light emitting devices.Type: ApplicationFiled: May 19, 2020Publication date: February 23, 2023Inventors: Hyeongrak CHOI, DIRK ENGLUND
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Patent number: 11585870Abstract: Nitrogen vacancy (NV) centers in diamond combine exceptional sensitivity with nanoscale spatial resolution by optically detected magnetic resonance (ODMR). Infrared (IR)-absorption-based readout of the NV singlet state transition can increase ODMR contrast and collection efficiency. Here, a resonant diamond metallodielectric metasurface amplifies IR absorption by concentrating the optical field near the diamond surface. This plasmonic quantum sensing metasurface (PQSM) supports plasmonic surface lattice resonances and balances field localization and sensing volume to optimize spin readout sensitivity. Combined electromagnetic and rate-equation modeling suggests a near-spin-projection-noise-limited sensitivity below 1 nT Hz?1/2 per ?m2 of sensing area using numbers for contemporary NV diamond samples and fabrication techniques.Type: GrantFiled: July 15, 2021Date of Patent: February 21, 2023Assignee: Massachusetts Institute of TechnologyInventors: Laura Kim, Hyeongrak Choi, Matthew Edwin Trusheim, Dirk Robert Englund
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Patent number: 11581694Abstract: Disclosed are dielectric cavity arrays with cavities formed by pairs of dielectric tips, wherein the cavities have low mode volume (e.g., 7*10?5?3, where X is the resonance wavelength of the cavity array), and large quality factor Q (e.g., 106 or more). Applications for such dielectric cavity arrays include, but are not limited to, Raman spectroscopy, second harmonic generation, optical signal detection, microwave-to-optical transduction, and as light emitting devices.Type: GrantFiled: May 19, 2020Date of Patent: February 14, 2023Assignee: Massachusetts Institute of TechnologyInventors: Hyeongrak Choi, Dirk Englund
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Patent number: 11500186Abstract: A microscope objective is disclosed comprising; a lens; a housing; a lens holder that is arranged to couple the lens to the housing; a first conductor and a second conductor, the first conductor and the second conductor extending along a sidewall of the housing, the first conductor and the second conductor being arranged to form at least one loop that is that is disposed about at least a portion of a perimeter of a field of view of the lens.Type: GrantFiled: October 31, 2019Date of Patent: November 15, 2022Assignee: Massachusetts Institute of TechnologyInventors: Dirk R. Englund, Hyeongrak Choi, Michael P. Walsh
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Patent number: 11448939Abstract: It remains a challenge to generate coherent radiation in the spectral range of 0.1-10 THz (“the THz gap”), a band for applications ranging from spectroscopy to security and high-speed wireless communications. Here, we disclose how to produce coherent radiation spanning the THz gap using efficient second-harmonic generation (SHG) in low-loss dielectric structures, starting from an electronic oscillator (EO) that generates coherent radiation at frequencies of about 100 GHz. The EO is coupled to cascaded, hybrid THz-band dielectric cavities that combine (1) extreme field concentration in high-quality-factor resonators with (2) nonlinear materials enhanced by phonon resonances. These cavities convert the input radiation into higher-frequency coherent radiation at conversion efficiencies of >103%/W, making it possible to bridge the THz gap with 1 W of input power.Type: GrantFiled: July 26, 2021Date of Patent: September 20, 2022Assignee: Massachusetts Institute of TechnologyInventors: Hyeongrak Choi, Dirk Robert Englund
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Publication number: 20220091474Abstract: It remains a challenge to generate coherent radiation in the spectral range of 0.1-10 THz (“the THz gap”), a band for applications ranging from spectroscopy to security and high-speed wireless communications. Here, we disclose how to produce coherent radiation spanning the THz gap using efficient second-harmonic generation (SHG) in low-loss dielectric structures, starting from an electronic oscillator (EO) that generates coherent radiation at frequencies of about 100 GHz. The EO is coupled to cascaded, hybrid THz-band dielectric cavities that combine (1) extreme field concentration in high-quality-factor resonators with (2) nonlinear materials enhanced by phonon resonances. These cavities convert the input radiation into higher-frequency coherent radiation at conversion efficiencies of >103%/W, making it possible to bridge the THz gap with 1 W of input power.Type: ApplicationFiled: July 26, 2021Publication date: March 24, 2022Applicant: Massachusetts Institute of TechnologyInventors: Hyeongrak CHOI, Dirk Robert ENGLUND
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Publication number: 20220082639Abstract: Nitrogen vacancy (NV) centers in diamond combine exceptional sensitivity with nanoscale spatial resolution by optically detected magnetic resonance (ODMR). Infrared (IR)-absorption-based readout of the NV singlet state transition can increase ODMR contrast and collection efficiency. Here, a resonant diamond metallodielectric metasurface amplifies IR absorption by concentrating the optical field near the diamond surface. This plasmonic quantum sensing metasurface (PQSM) supports plasmonic surface lattice resonances and balances field localization and sensing volume to optimize spin readout sensitivity. Combined electromagnetic and rate-equation modeling suggests a near-spin-projection-noise-limited sensitivity below 1 nT Hz?1/2 per m2 of sensing area using numbers for contemporary NV diamond samples and fabrication techniques.Type: ApplicationFiled: July 15, 2021Publication date: March 17, 2022Applicant: Massachusetts Institute of TechnologyInventors: Laura KIM, Hyeongrak CHOI, Matthew Edwin TRUSHEIM, Dirk Robert ENGLUND
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Publication number: 20210117845Abstract: Quantum information processing involves entangling large numbers of qubits, which can be realized as defect centers in a solid-state host. The qubits can be implemented as individual unit cells, each with its own control electronics, that are arrayed in a cryostat. Free-space control and pump beams address the qubit unit cells through a cryostat window. The qubit unit cells emit light in response to these control and pump beams and microwave pulses applied by the control electronics. The emitted light propagates through free space to a mode mixer, which interferes the optical modes from adjacent qubit unit cells for heralded Bell measurements. The qubit unit cells are small (e.g., 10 ?m square), so they can be tiled in arrays of up to millions, addressed by free-space optics with micron-scale spot sizes. The processing overhead for this architecture remains relatively constant, even with large numbers of qubits, enabling scalable large-scale quantum information processing.Type: ApplicationFiled: August 17, 2020Publication date: April 22, 2021Inventors: Hyeongrak CHOI, Dirk Robert ENGLUND
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Publication number: 20210057135Abstract: Using the Meissner effect in superconductors, demonstrated here is the capability to create an arbitrarily high magnetic flux density (also sometimes referred to as “flux squeezing”). This technique has immediate applications for numerous technologies. For example, it allows the generation of very large magnetic fields (e.g., exceeding 1 Tesla) for nuclear magnetic resonance (NMR), magnetic resonance imaging (MRI), the generation of controlled magnetic fields for advanced superconducting quantum computing devices, and/or the like. The magnetic field concentration/increased flux density approaches can be applied to both static magnetic fields (i.e., direct current (DC) magnetic fields) and time-varying magnetic fields (i.e., alternating current (AC) magnetic fields) up to microwave frequencies.Type: ApplicationFiled: June 22, 2020Publication date: February 25, 2021Inventors: Hyeongrak CHOI, Dirk Robert ENGLUND
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Publication number: 20200201012Abstract: A microscope objective is disclosed comprising; a lens; a housing; a lens holder that is arranged to couple the lens to the housing; a first conductor and a second conductor, the first conductor and the second conductor extending along a sidewall of the housing, the first conductor and the second conductor being arranged to form at least one loop that is that is disposed about at least a portion of a perimeter of a field of view of the lens.Type: ApplicationFiled: October 31, 2019Publication date: June 25, 2020Inventors: Dirk R. ENGLUND, Hyeongrak CHOI, Michael P. WALSH