Abstract: Disclosed herein are an apparatus and method for mutual authentication of quantum entities based on Measurement-Device-Independent Quantum Key Distribution (MDI-QKD). The method may include configuring a quantum input form based on an authentication key shared in advance with a counterpart entity, applying polarization modulation to the configured quantum input form, transmitting the quantum input form to which polarization modulation is applied to a quantum measurement device, and authenticating the counterpart entity by checking whether the counterpart entity configures a quantum input form according to the shared authentication key using a measurement result and information about polarization modulation.

Abstract: In an apparatus and method for receiving light using multiple light receiving sensors, a light receiving apparatus includes a light receiving unit comprising multiple light receiving sensors to receive an optical signal; an analyzing unit to extract a highlighted area; a light receiving controlling unit to activate a first light receiving sensor corresponding to the highlighted area, and to determine the first light receiving sensor to be a part of a first sensor group; and a data processing unit to demodulate an optical signal received by the first sensor group into data. A method for receiving an optical signal including extracting a highlighted area; activating a light receiving sensor corresponding to the highlighted area; receiving light through the first light receiving sensor; grouping the first light receiving sensor into a first sensor group; and demodulating an optical signal received by the first sensor group into data.