公开(公告)号：US20230351168A1

公开(公告)日：2023-11-02

申请号：US18310697

申请日：2023-05-02

Applicant: Massachusetts Institute of Technology

Inventor： Jasvith Raj Basani ,  Mikkel HEUCK ,  Dirk Robert ENGLUND ,  Stefan Ivanov Krastanov

IPC: G06N3/067 ,  G06N3/048

CPC classification number: G06N3/067 ,  G06N3/048

Abstract: An all-photonic computational accelerator encodes information in the amplitudes of frequency modes stored in a ring resonator. Nonlinear optical processes enable interaction among these modes. Both the matrix multiplication and element-wise activation functions on these modes (the artificial neurons) occur through coherent processes, enabling the representation of negative and complex numbers without digital electronics. This accelerator has a lower hardware footprint than electronic and optical accelerators, as the matrix multiplication happens in a single multimode resonator on chip. Our architecture provides a unitary, reversible mode of computation, enabling on-chip analog Hamiltonian-echo backpropagation for gradient descent and other self-learning tasks. Moreover, the computational speed increases with the power of the pumps to arbitrarily high rates, as long as the circuitry can sustain the higher optical power.

公开(公告)号：US20230350236A1

公开(公告)日：2023-11-02

申请号：US18141279

申请日：2023-04-28

Applicant: The MITRE Corporation ,  National Technology & Engineering Solution of Sandia, LLC ,  MIT - Massachusetts Institute of Technology

Inventor： David HEIM ,  Henry WEN ,  Mark DONG ,  Hugo LAROCQUE ,  Andrew LEENHEER ,  Gerald GILBERT ,  Matthew EICHENFIELD ,  Mikkel HEUCK ,  Dirk ENGLUND

IPC: G02F1/01 ,  G06N10/40

CPC classification number: G02F1/0134 ,  G06N10/40

Abstract: Provided herein is a photonic modulator and methods for controlling a photonic modulator that can control the phase and/or amplitude of photons being transmitted through the modulator to minimize photonic loss while remaining power efficient and operating at high speeds. The photonic modulator can include a substrate with a pair of piezoelectric cantilevers spaced apart from one another by a gap, with a photonic waveguide disposed in the substrate that extends across the modulator and bridges the gap between the piezoelectric cantilevers. In one or more examples, the piezoelectric cantilevers can be configured to move away from the substrate in response to an electrical signal, such that a refractive index of the photonic waveguide is altered.

公开(公告)号：US20180314131A1

公开(公告)日：2018-11-01

申请号：US15792066

申请日：2017-10-24

Applicant: Massachusetts Institute of Technology

Inventor： Mihir Pant ,  Dirk Robert ENGLUND ,  Mikkel HEUCK

IPC: G02F1/31 ,  H04B10/70 ,  G02F1/39 ,  G02F1/35

CPC classification number: G02F1/31 ,  G02F1/3501 ,  G02F1/3536 ,  G02F1/39 ,  G02F2001/3503 ,  H04B10/70

Abstract: A photon source to deliver single photons includes a storage ring resonator to receive pump photons and generate a signal photon and an idler photon. An idler resonator is coupled to the storage resonator to couple the idler photon out of the storage resonator and into a detector. Detection of the idler photon stops the pump photons from entering the storage resonator. A signal resonator is coupled to the storage resonator to couple out the signal photon remaining in the storage resonator and delivers the signal photon to applications. The photon source can be fabricated into a photonic integrated circuit to achieve high compactness, reliability, and controllability.