公开(公告)号：US20190310070A1

公开(公告)日：2019-10-10

申请号：US16433649

申请日：2019-06-06

Applicant: Massachusetts Institute of Technology

Inventor： JACOB C. MOWER ,  Nicholas C. HARRIS ,  DIRK ENGLUND ,  GREG STEINBRECHER

IPC: G01B9/02 ,  G06N10/00 ,  B82Y20/00 ,  G06N20/00

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.

公开(公告)号：US20230059700A1

公开(公告)日：2023-02-23

申请号：US16878046

申请日：2020-05-19

Applicant: Massachusetts Institute of Technology

Inventor： Hyeongrak CHOI ,  DIRK ENGLUND

IPC: G01N21/64 ,  G01N21/65 ,  G01N21/41 ,  B01L3/00 ,  B82Y20/00 ,  G01N21/03

Abstract: 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 λ3, where λ 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.

公开(公告)号：US20230045938A1

公开(公告)日：2023-02-16

申请号：US17736667

申请日：2022-05-04

Applicant: Massachusetts Institute of Technology

Inventor： Jacques Johannes CAROLAN ,  Mihika PRABHU ,  Scott A. SKIRLO ,  Yichen Shen ,  Marin SOLJACIC ,  DIRK ENGLUND ,  Nicholas C. HARRIS

IPC: G06E3/00 ,  G06N3/04 ,  G06N3/08 ,  G02F1/225 ,  G02F1/35 ,  G02F1/365 ,  G02F3/02 ,  G06N3/067

Abstract: An optical neural network is constructed based on photonic integrated circuits to perform neuromorphic computing. In the optical neural network, matrix multiplication is implemented using one or more optical interference units, which can apply an arbitrary weighting matrix multiplication to an array of input optical signals. Nonlinear activation is realized by an optical nonlinearity unit, which can be based on nonlinear optical effects, such as saturable absorption. These calculations are implemented optically, thereby resulting in high calculation speeds and low power consumption in the optical neural network.

公开(公告)号：US20200379504A1

公开(公告)日：2020-12-03

申请号：US16986383

申请日：2020-08-06

Applicant: Massachusetts Institute of Technology

Inventor： Jacques Johannes CAROLAN ,  Mihika PRABHU ,  Scott A. SKIRLO ,  Yichen Shen ,  Marin SOLJACIC ,  DIRK ENGLUND ,  Nicholas Christopher HARRIS

IPC: G06E3/00 ,  G06N3/04 ,  G06N3/08 ,  G02F1/225 ,  G02F1/35 ,  G02F1/365 ,  G02F3/02 ,  G06N3/067

Abstract: An optical neural network is constructed based on photonic integrated circuits to perform neuromorphic computing. In the optical neural network, matrix multiplication is implemented using one or more optical interference units, which can apply an arbitrary weighting matrix multiplication to an array of input optical signals. Nonlinear activation is realized by an optical nonlinearity unit, which can be based on nonlinear optical effects, such as saturable absorption. These calculations are implemented optically, thereby resulting in high calculation speeds and low power consumption in the optical neural network.

公开(公告)号：US20200333683A1

公开(公告)日：2020-10-22

申请号：US16842048

申请日：2020-04-07

Applicant: Massachusetts Institute of Technology

Inventor： Scott A. SKIRLO ,  Cheryl Marie SORACE-AGASKAR ,  Marin SOLJACIC ,  Simon VERGHESE ,  Jeffrey S. HERD ,  Paul William JUODAWLKIS ,  Yi YANG ,  DIRK ENGLUND ,  Mihika PRABHU

IPC: G02F1/313 ,  G02F1/295 ,  G01S7/481

Abstract: An integrated optical beam steering device includes a planar dielectric lens that collimates beams from different inputs in different directions within the lens plane. It also includes an output coupler, such as a grating or photonic crystal, that guides the collimated beams in different directions out of the lens plane. A switch matrix controls which input port is illuminated and hence the in-plane propagation direction of the collimated beam. And a tunable light source changes the wavelength to control the angle at which the collimated beam leaves the plane of the substrate. The device is very efficient, in part because the input port (and thus in-plane propagation direction) can be changed by actuating only log2 N of the N switches in the switch matrix. It can also be much simpler, smaller, and cheaper because it needs fewer control lines than a conventional optical phased array with the same resolution.