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학술지 Density Matrix Simulation of Quantum Error Correction Codes for Near-term Quantum Devices
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저자
백충헌, Tomohiro Otsuka, Seigo Tarucha, 최병수
발행일
202001
출처
Quantum Science and Technology, v.5 no.1, pp.1-11
ISSN
2058-9565
출판사
Institute of Physics (IOP)
DOI
https://dx.doi.org/10.1088/2058-9565/ab5887
협약과제
19ZH1800, 양자컴퓨팅 플랫폼 및 비용효율성 향상에 대한 연구개발, 최병수
초록
Fault-tolerant quantum computing requires many qubits with long lifetimes and accurate quantum gate operations. However, external noise limits the computing time and hampers accurate quantum gate operations. Quantum error correction (QEC) codes may extend such limits, but imperfect gate operations during QEC cause errors, which could cancel out QEC. We used density matrix simulations to examine the performance of QEC codes with five qubits. In current quantum devices, less than ten qubits are needed to conduct sufficient gate operations within their lifetime so that it is feasible to implement QEC codes. We analyzed the maximum tolerable error rate and error correction effect of individual QEC codes according to the qubit arrangement and gate accuracy. Assuming a 0.1% gate error probability, a logical |1> state encoded by a five-qubit QEC code is expected to have a 0.25 higher fidelity than its physical counterpart.
키워드
density matrix simulation, near-term quantum computing, quantum error correction codes
KSP 제안 키워드
AND gate, Computing time, Error correction code, External noise, Fault-tolerant, Gate operation, Noise limits, Quantum Error Correction, Quantum computing, Quantum devices, Tolerable error
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