METHOD FOR INCREASING QUANTUM ENTANGLEMENT, QUANTUM REPEATING METHOD AND QUANTUM REPEATER USING THEREOF

摘要

PURPOSE: A method for increasing quantum entanglement, a quantum relay method using the same, and a quantum relay are provided to solve a problem which does not uses quantum communication by easily reducing quantum entanglement due to incomplete measurement. CONSTITUTION: Two input signals of a quantum state are inputted(110). In case a background noise is in a non-Markovian type(120), the background noise is converted in a Markovian type(130). Both entanglement distillation is performed from the converted background noise and the inputted input signal(150). Time difference between a source input signal and a target input signal is delayed as ESD(Entanglement Sudden Death) generation time. [Reference numerals] (110) Receiving two input signals of a quantum state; (120) Determining a type of background noise; (130) Converting background noise into a Markovian type by delaying one of two input signals as predetermined time when the back ground noise is a non-Markovian type; (140) Calculating a Pauli channel for back ground noise of a Markovian type and mixing predetermined other noise and background noise by using the calculated Pauli channel; (150) Extracting quantum entanglement from an input signal and background noise of a converted Markovian type; (AA) Start; (BB) End