公开(公告)号：US20250139488A1

公开(公告)日：2025-05-01

申请号：US18932029

申请日：2024-10-30

Applicant: Korea University Research and Business Foundation

Inventor： Yujin KANG ,  Jonghyun LEE ,  Jinyoung HA ,  Jun HEO

IPC: G06N10/60 ,  G06N10/20

Abstract: Disclosed is a method for a logical operation performed by a quantum computing device, which may include: acquiring a logical qubit in which a physical qubit is encoded with a surface code; when performing a logical Hadamard operation in the logical qubit, and performing a first operation using a first joint measurement, performing a boundary flip; performing the first operation by using a second joint measurement other than the first joint measurement in the boundary-flipped logical qubit; and changing an order of the logical Hadamard operation after a step of performing the first operation by using the second joint measurement.

公开(公告)号：US20230419159A1

公开(公告)日：2023-12-28

申请号：US18253244

申请日：2021-01-25

Applicant: KOREA UNIVERSITY RESEARCH AND BUSINESS FOUNDATION

Inventor： Jun HEO ,  Jong Hyun LEE

IPC: G06N10/70

CPC classification number: G06N10/70

Abstract: The present disclosure relates to a quantum error correction code and, more particularly, to a method and apparatus for optimizing a quantum error correction code in biased error environment. The method for optimizing a quantum error correction code, according to an embodiment of the present disclosure, may comprise the steps of: estimating, on the basis of a physical error rate (pphy) and a bias degree (η), a logical error rate (Pfail) for each of one or more candidate lattice sizes; determining, on the basis of the estimated logical error rate (Pfail) and a target logical error rate (Pf,target), an optimal lattice size from among the one or more candidate lattice sizes; and arranging a Qubit on the basis of the optimal lattice size. Here, when the bias degree (η) exceeds 1, the one or more candidate lattice sizes may be defined in the form of a rectangular excluding a square.

公开(公告)号：US20230044487A1

公开(公告)日：2023-02-09

申请号：US17559514

申请日：2021-12-22

Applicant: Korea University Research and Business Foundation

Inventor： Jun HEO ,  Yujin KANG

IPC: G06N10/60 ,  G06N10/20

Abstract: Disclosed is a minimum searching method for searching a minimum in N (N is a natural number) data by a computing device including at least one processor. The method for searching the minimum may include: determining a threshold; initializing Qubits to include indexes representing addresses in which the N data are recorded, respectively, and the threshold in a superposition state; returning, from a superposition-state index, superposition-state data corresponding to the superposition-state index through a quantum memory; comparing the superposition-state data with the threshold in parallel through a quantum comparator (Q-comp); and searching the minimum based on the comparison result.

公开(公告)号：US20200083911A1

公开(公告)日：2020-03-12

申请号：US16233645

申请日：2018-12-27

Applicant: KOREA UNIVERSITY RESEARCH AND BUSINESS FOUNDATION

Inventor： Jun HEO ,  Byung Kyu AHN ,  Jong Hyun LEE

IPC: H03M13/29 ,  H03M13/11

Abstract: The present disclosure relates to a low-complexity syndrome based decoding apparatus and method and a low-complexity syndrome based decoding apparatus includes: a hard decision unit which performs hard decision on a current input value to output a hard decision vector; a syndrome calculator which performs a syndrome operation on the hard decision vector and determines an error type of the hard decision vector based on the syndrome operation result; and a decoder which selects a predetermined decoding algorithm in accordance with the error type to perform the decoding, and the error type includes at least one of no error, a single error, and a double error.