公开(公告)号：US10171088B1

公开(公告)日：2019-01-01

申请号：US16034073

申请日：2018-07-12

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Taewan Kim ,  Byung-Soo Choi

IPC: H03K19/195 ,  H03K19/20 ,  G06N99/00

Abstract: The inventive concept relates to a quantum circuit that shifts the phase of a target qubit by π/2n−1 based on a control qubit. The quantum circuit may include a first auxiliary circuit, a rotation gate, and a second auxiliary circuit. The first auxiliary circuit converts the first qubit state into the second qubit state according to the entanglement of a control qubit, a target qubit, and an ancillary qubit having a |0> state. The rotation gate shifts the phase for some basis states of the second qubit state by π/2n−1, and converts the second qubit state to the third qubit state. The second auxiliary circuit converts the third qubit state to the fourth qubit state such that the phase of the target qubit is shifted by π/2n−1.

公开(公告)号：US11972179B2

公开(公告)日：2024-04-30

申请号：US16924522

申请日：2020-07-09

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Chungheon Baek ,  Byung-Soo Choi

IPC: G06N10/00 ,  G06F30/20 ,  G06F119/02 ,  G06F119/12

CPC classification number: G06F30/20 ,  G06N10/00 ,  G06F2119/02 ,  G06F2119/12

Abstract: Provided is a method of simulating a quantum computing system having an error correction function. The method includes generating a quantum information density matrix, generating a coded density matrix by performing quantum error correction coding on the quantum information density matrix, applying quantum computing to the coded density matrix and calculating a change in a first reliability of the coded density matrix, applying the quantum computing to the quantum information density matrix and calculating a change in a second reliability of the quantum information density matrix, and determining an operation time of the quantum computing, based on the change in the first reliability and the change in the second reliability.