公开(公告)号：US10158481B2

公开(公告)日：2018-12-18

申请号：US15179583

申请日：2016-06-10

Applicant: Massachusetts Institute of Technology

Inventor： Darius Bunandar ,  Nicholas C. Harris ,  Dirk Robert Englund

IPC: H04L9/08 ,  H04B10/70 ,  H04B10/079 ,  H04B10/25

Abstract: Systems, apparatus, and methods using an integrated photonic chip capable of operating at rates higher than a Gigahertz for quantum key distribution are disclosed. The system includes two identical transmitter chips and one receiver chip. The transmitter chips encode photonic qubits by modulating phase-randomized attenuated laser light within two early or late time-bins. Each transmitter chip can produce a single-photon pulse either in one of the two time-bins or as a superposition of the two time-bins with or without any phase difference. The pulse modulation is achieved using ring resonators, and the phase difference between the two time-bins is obtained using thermo-optic phase shifters and/or time delay elements. The receiver chip employs either homodyne detection or heterodyne detection to perform Bell measurements.