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公开(公告)号：US20230351168A1
公开(公告)日：2023-11-02
申请号：US18310697
申请日：2023-05-02
摘要： 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.
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2.发明公开公开(公告)号：US20230208628A1
公开(公告)日：2023-06-29
申请号：US18146085
申请日：2022-12-23
发明人： Stefan Ivanov Krastanov , Hamza Raniwala , Hanfeng WANG , Matthew Edwin TRUSHEIM , Laura KIM , Dirk Robert ENGLUND
CPC分类号： H04L9/0855 , H04B10/70
摘要： A 1D diamond nanobeam can act as a coherent mechanical interface between spin defect centers in diamond and telecom optical modes. The nanobeam includes embedded mechanical and electric field concentrators with mechanical and optical mode volumes of Vmech/Λp3 ˜10−5 and Vopt/λ3 ˜10−3, respectively. With a Group IV vacancy in the concentrator, the nanobeam can operate at spin-mechanical coupling rates approaching 40 MHz with high acousto-optical couplings. This nanobeam, used in an entanglement heralding scheme, can provide high-fidelity Bell pairs between quantum repeaters. Using the mechanical interface as an intermediary between the optical and spin subsystems enables addressing the spin defect center with telecom optics, bypassing the native wavelength of the spin. As the spin is never optically excited or addressed, the device can operate at temperatures up to 40 K with no appreciable spectral diffusion, limited by thermal losses. Optomechanical devices with high spin-mechanical coupling can be useful for quantum repeaters.
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