Abstract: The present disclosure relates to an eavesdropper detection apparatus and an operating method thereof, capable of effectively detecting an eavesdropper existing between a transmitter and a receiver in bit transmission by a quantum key distribution scheme.

Abstract: Provided is a quantum error correction code generating method using a graph state. According to the exemplary embodiment of the present invention, a quantum error correction code generating method using a graph state: includes: generating a graph state representing an adjacency relationship between a plurality of qubits including at least one entangled qubit (ebit); generating a first stabilizer generator which corresponds to the graph state and is configured by a plurality of stabilizers for detecting errors of the plurality of qubits; and generating at least one logical Z operator used for a phase flip operation of a codeword, at least one logical X operator used for a bit flip operation of a codeword, and a second stabilizer generator which is a sub set of the first stabilizer generator, based on the first stabilizer generator and the at least one entangled qubit.

Abstract: Provided is a quantum error correction code generating method using a graph state. According to the exemplary embodiment of the present invention, a quantum error correction code generating method using a graph state: includes: generating a graph state representing an adjacency relationship between a plurality of qubits including at least one entangled qubit (ebit); generating a first stabilizer generator which corresponds to the graph state and is configured by a plurality of stabilizers for detecting errors of the plurality of qubits; and generating at least one logical Z operator used for a phase flip operation of a codeword, at least one logical X operator used for a bit flip operation of a codeword, and a second stabilizer generator which is a sub set of the first stabilizer generator, based on the first stabilizer generator and the at least one entangled qubit.

Abstract: A media controller with anti-microbial and anti-fungal capability is provided. The media controller not only receives and outputs an audio signal provided from an external media device such as a television or a recorded media player and controls the external media device, but also outputs the sound or audio signal received from the media device as audible sound. The media controller is capable of having an antimicrobial, antifungal, or antibacterial agent used in hospitals coated on an external surface thereof to provide anti-microbial and anti-fungal properties when a user comes into contact with the media controller.