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公开(公告)号：US20210242651A1
公开(公告)日：2021-08-05
申请号：US17239085
申请日：2021-04-23
申请人： Psiquantum, Corp.
发明人： Eric Dudley , Yong Liang , Faraz Najafi , Vimal Kamineni , Ann Melnichuk
摘要： An optical device includes a substrate, a dielectric layer on the substrate, a waveguide within the dielectric layer, a light sensitive component (e.g., a photodetector) in the dielectric layer and coupled to the waveguide, and a plurality of light isolation structures in at least one of the substrate or the dielectric layer and configured to prevent stray light from reaching the light sensitive component. In some embodiments, a light isolation structure in the plurality of light isolation structures includes two opposing sidewalls and a filling material between the two opposing sidewalls. The two opposing sidewalls include an optical isolation layer. The filling material is characterized by a coefficient of thermal expansion (CTE) matching a CTE of at least one of the substrate or the dielectric layer.
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公开(公告)号：US11048041B2
公开(公告)日：2021-06-29
申请号：US16599526
申请日：2019-10-11
申请人： Psiquantum, Corp.
发明人： Koustuban Ravi , Mark Thompson , Eric Dudley
摘要： A Mach-Zehnder interferometer (MZI) filter comprising one or more passive compensation structures are described. The passive compensation structures yield MZI filters that are intrinsically tolerant to perturbations in waveguide dimensions and/or other ambient conditions. The use of n+1 waveguide widths can mitigate n different sources of perturbation to the filter. The use of at least three different waveguide widths for each Mach-Zehnder waveguide can alleviate sensitivity of filter performance to random width or temperature variations. A tolerance compensation portion is positioned between a first coupler section and a second coupler section, wherein the tolerance compensation portion includes a first compensation section having a second width, a second compensation section having a third width and a third compensation section having a fourth width, wherein the fourth width is greater than the third width and the third width is greater than the second width.
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公开(公告)号：US11988554B2
公开(公告)日：2024-05-21
申请号：US18103413
申请日：2023-01-30
申请人： PsiQuantum Corp.
发明人： Faraz Najafi , Eric Dudley , Mark Thompson
CPC分类号： G01J1/44 , G01J1/0407 , G01J2001/4446
摘要： A method of resolving a number of photons received by a photon detector includes optically coupling a waveguide to a superconducting wire having alternating narrow and wide portions; electrically coupling the superconducting wire to a current source; and electrically coupling an electrical contact in parallel with the superconducting wire. The electrical contact has a resistance less than a resistance of the superconducting wire while at least one narrow portion of the superconducting wire is in a non-superconducting state. The method includes providing to the superconducting wire, from the current source, a current configured to maintain the superconducting wire in a superconducting state in the absence of incident photons; receiving one or more photons via the waveguide; measuring an electrical property of the superconducting wire, proportional to a number of photons incident on the superconducting wire; and determining the number of received photons based on the electrical property.
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公开(公告)号：US20220003928A1
公开(公告)日：2022-01-06
申请号：US17345724
申请日：2021-06-11
申请人： Psiquantum, Corp.
发明人： Koustuban Ravi , Mark Thompson , Eric Dudley
摘要： A Mach-Zehnder interferometer (MZI) filter comprising one or more passive compensation structures are described. The passive compensation structures yield MZI filters that are intrinsically tolerant to perturbations in waveguide dimensions and/or other ambient conditions. The use of n+1 waveguide widths can mitigate n different sources of perturbation to the filter. The use of at least three different waveguide widths for each Mach-Zehnder waveguide can alleviate sensitivity of filter performance to random width or temperature variations. A tolerance compensation portion is positioned between a first coupler section and a second coupler section, wherein the tolerance compensation portion includes a first compensation section having a second width, a second compensation section having a third width and a third compensation section having a fourth width, wherein the fourth width is greater than the third width and the third width is greater than the second width.
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公开(公告)号：US10534130B1
公开(公告)日：2020-01-14
申请号：US16514832
申请日：2019-07-17
申请人： Psiquantum, Corp.
发明人： Koustuban Ravi , Mark Thompson , Eric Dudley
摘要： A Mach-Zehnder interferometer (MZI) filter comprising one or more passive compensation structures are described. The passive compensation structures yield MZI filters that are intrinsically tolerant to perturbations in waveguide dimensions and/or other ambient conditions. The use of n+1 waveguide widths can mitigate n different sources of perturbation to the filter. The use of at least three different waveguide widths for each Mach-Zehnder waveguide can alleviate sensitivity of filter performance to random width or temperature variations. A tolerance compensation portion is positioned between a first coupler section and a second coupler section, wherein the tolerance compensation portion includes a first compensation section having a second width, a second compensation section having a third width and a third compensation section having a fourth width, wherein the fourth width is greater than the third width and the third width is greater than the second width.
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公开(公告)号：US20240310582A1
公开(公告)日：2024-09-19
申请号：US18122392
申请日：2023-03-16
申请人： Psiquantum, Corp.
IPC分类号： G02B6/293
CPC分类号： G02B6/29355
摘要： A notch filter circuit includes a wavelength demultiplexer, a first pump rejection filter coupled to the wavelength demultiplexer, and a second pump rejection filter coupled to the wavelength demultiplexer. The notch filter circuit also includes a first notch filter arm coupled to the first pump rejection filter and including a first chain of asymmetric Mach-Zehnder interferometers (MZIs) and a second notch filter arm coupled to the second pump rejection filter and including a second chain of asymmetric MZIs.
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公开(公告)号：US11874496B2
公开(公告)日：2024-01-16
申请号：US17987741
申请日：2022-11-15
申请人： Psiquantum, Corp.
发明人： Koustuban Ravi , Mark Thompson , Eric Dudley
CPC分类号： G02B6/12007 , G02B6/1228 , G02B6/13 , G02B6/29355 , G02B2006/12061
摘要： A photonic switch includes a first waveguide including a first region extending between a first coupler section and a second coupler section and a second region extending between the second coupler section and a third coupler section. The photonic switch also includes a second waveguide including a first portion extending between the first coupler section and the second coupler section, the first portion including at least two first compensation sections each having a different waveguide width, and a second portion extending between the second coupler section and the third coupler section, the second portion including at least two second compensation sections each having a different waveguide width. The photonic switch further includes at least one variable phase-shifter disposed in at least one of the first waveguide or the second waveguide.
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公开(公告)号：US11994426B1
公开(公告)日：2024-05-28
申请号：US17098235
申请日：2020-11-13
申请人： PsiQuantum Corp.
发明人： Faraz Najafi , Eric Dudley
CPC分类号： G01J1/44 , G01J1/4228 , G06N10/00 , H10N60/30 , H10N60/84 , H10N69/00 , G01J2001/442 , G01J2001/4473
摘要： A photon counting device includes unit cells, a bias current source coupled to the unit cells, and a waveguide coupled to the unit cells. Each unit cell includes photodetector(s). Each photodetector includes superconducting component(s) and a transistor. The transistor includes a superconducting gate that is coupled in parallel with the photodetector(s), and a channel that is electrically isolated from the superconducting gate. For each unit cell, a photodetector is optically coupled to the waveguide. A superconducting component is configured to transition from the superconducting state to the non-superconducting state in response to a photon being incident upon the superconducting component while the superconducting component receives at least a portion of bias current output from the bias current source. The superconducting gate of the unit cell is configured to transition from the superconducting state to the non-superconducting state in response to the superconducting component transitioning to the non-superconducting state.
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公开(公告)号：US20230152515A1
公开(公告)日：2023-05-18
申请号：US17987741
申请日：2022-11-15
申请人： Psiquantum, Corp.
发明人： Koustuban Ravi , Mark Thompson , Eric Dudley
CPC分类号： G02B6/12007 , G02B6/1228 , G02B6/13 , G02B2006/12061 , G02B6/29355
摘要： A photonic switch includes a first waveguide including a first region extending between a first coupler section and a second coupler section and a second region extending between the second coupler section and a third coupler section. The photonic switch also includes a second waveguide including a first portion extending between the first coupler section and the second coupler section, the first portion including at least two first compensation sections each having a different waveguide width, and a second portion extending between the second coupler section and the third coupler section, the second portion including at least two second compensation sections each having a different waveguide width. The photonic switch further includes at least one variable phase-shifter disposed in at least one of the first waveguide or the second waveguide.
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公开(公告)号：US11493687B1
公开(公告)日：2022-11-08
申请号：US16920055
申请日：2020-07-02
申请人： Psiquantum, Corp.
发明人： Eric Dudley
摘要： Techniques disclosed herein relate generally to photonic integrated circuits working at cryogenic temperatures. In one example, a device includes a substrate, a dielectric layer on the substrate, an optical waveguide in the dielectric layer, a superconducting circuit in the dielectric layer and coupled to the optical waveguide, and a micro-channel in the dielectric layer and adjacent to the superconducting circuit. The micro-channel is aligned with the superconducting circuit and is configured to conduct a liquid at a cryogenic temperature to locally cool the superconducting circuit.
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