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Qubit Control and Applications to Quantum Computation and Open Quantum Systems
Qubit Control and Applications to Quantum Computation and Open Quantum Systems
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20250211151458
- ISBN
- 9798384453611
- DDC
- 540
- 저자명
- Yang, Zhibo.
- 서명/저자
- Qubit Control and Applications to Quantum Computation and Open Quantum Systems
- 발행사항
- [Sl] : University of California, Berkeley, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 168 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 86-03, Section: B.
- 주기사항
- Advisor: Whaley, K. Birgitta.
- 학위논문주기
- Thesis (Ph.D.)--University of California, Berkeley, 2024.
- 초록/해제
- 요약Quantum computing has the potential to solve problems that are intractable for classical computers. In practice, physical qubits are coupled to their environments and are open quantum systems. To mitigate and correct environmental noises or utilize environmental degrees of freedom, one needs to carefully study the qubit properties in a open quantum system setting. In this thesis, we will first provide an overview of environmental couplings that are relevant to the quantum hardware of interest in the following chapters.We begin the main body of this thesis by introducing a robust control method for the implementation of quantum logic gates in superconducting devices. By switching between two time-constant Hamiltonians, single and two-qubit gates can be implemented with fidelity exceeding the threshold of most quantum error corrections codes in the presence of TLS bath and Markovian bath. This method is inspired by variational quantum algorithms (VQA), and we continue to study quantum machine learning (QML), which is a specific type of VQA, in the following chapter. We investigate the impact of dephasing on QML and show dephasing significantly lower image classification accuracy of QML models. However, we also reveal that increasing virtual bond dimension of QML networks by adding ancilla can improve the accuracy and adding two ancilla can mostly compensate for the accuracy loss due to dephasing.We then investigate qubits in open quantum system for quantum emulation. Specifically, we focus on the emulation of energy transfer between chromosomes in natural light-harvesting complexes using ion-trap quantum devices. This uphill energy transfer is assisted by vibrational modes in the molecules and is named vibration assisted energy transfer (VAET). We start with the study of VAET between two sites (qubits) coupled to one vibrational mode in the presence of classical white noise, which has the effect of dephasing. We show that in the weak noise regime, energy transfer is enhanced by VAET and harmed by the classical noise. In strong noise regime, the VAET signature is wiped out and the energy transfer efficiency will first increase with noise strength and then decrease to a quantum Zeno regime, a phenomenon termed as environment-assisted quantum transport (ENAQT). This is followed by the study of an expanded system with three sites coupled to two vibrational modes. We present a rich array of energy transfer processes. Among them, two phonon process associated to the mode coupled to the bridging site is found to have the greatest contribution to the energy transfer process. We also investigate the model in different scenarios, including varying coupling strength and temperature, presence of dephasing and coupled nodes, finding similar patterns but different relative energy transfer efficiencies. We then conclude with the impact of these studies on the application of near-term quantum devices.
- 일반주제명
- Chemistry
- 일반주제명
- Quantum physics
- 일반주제명
- Physics
- 일반주제명
- Computational physics
- 키워드
- Quantum control
- 기타저자
- University of California, Berkeley Chemistry
- 기본자료저록
- Dissertations Abstracts International. 86-03B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520250211151458
■006m o d
■007cr#unu||||||||
■020 ▼a9798384453611
■035 ▼a(MiAaPQ)AAI31297478
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a540
■1001 ▼aYang, Zhibo.
■24510▼aQubit Control and Applications to Quantum Computation and Open Quantum Systems
■260 ▼a[Sl]▼bUniversity of California, Berkeley▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a168 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 86-03, Section: B.
■500 ▼aAdvisor: Whaley, K. Birgitta.
■5021 ▼aThesis (Ph.D.)--University of California, Berkeley, 2024.
■520 ▼aQuantum computing has the potential to solve problems that are intractable for classical computers. In practice, physical qubits are coupled to their environments and are open quantum systems. To mitigate and correct environmental noises or utilize environmental degrees of freedom, one needs to carefully study the qubit properties in a open quantum system setting. In this thesis, we will first provide an overview of environmental couplings that are relevant to the quantum hardware of interest in the following chapters.We begin the main body of this thesis by introducing a robust control method for the implementation of quantum logic gates in superconducting devices. By switching between two time-constant Hamiltonians, single and two-qubit gates can be implemented with fidelity exceeding the threshold of most quantum error corrections codes in the presence of TLS bath and Markovian bath. This method is inspired by variational quantum algorithms (VQA), and we continue to study quantum machine learning (QML), which is a specific type of VQA, in the following chapter. We investigate the impact of dephasing on QML and show dephasing significantly lower image classification accuracy of QML models. However, we also reveal that increasing virtual bond dimension of QML networks by adding ancilla can improve the accuracy and adding two ancilla can mostly compensate for the accuracy loss due to dephasing.We then investigate qubits in open quantum system for quantum emulation. Specifically, we focus on the emulation of energy transfer between chromosomes in natural light-harvesting complexes using ion-trap quantum devices. This uphill energy transfer is assisted by vibrational modes in the molecules and is named vibration assisted energy transfer (VAET). We start with the study of VAET between two sites (qubits) coupled to one vibrational mode in the presence of classical white noise, which has the effect of dephasing. We show that in the weak noise regime, energy transfer is enhanced by VAET and harmed by the classical noise. In strong noise regime, the VAET signature is wiped out and the energy transfer efficiency will first increase with noise strength and then decrease to a quantum Zeno regime, a phenomenon termed as environment-assisted quantum transport (ENAQT). This is followed by the study of an expanded system with three sites coupled to two vibrational modes. We present a rich array of energy transfer processes. Among them, two phonon process associated to the mode coupled to the bridging site is found to have the greatest contribution to the energy transfer process. We also investigate the model in different scenarios, including varying coupling strength and temperature, presence of dephasing and coupled nodes, finding similar patterns but different relative energy transfer efficiencies. We then conclude with the impact of these studies on the application of near-term quantum devices.
■590 ▼aSchool code: 0028.
■650 4▼aChemistry
■650 4▼aQuantum physics
■650 4▼aPhysics
■650 4▼aComputational physics
■653 ▼aOpen quantum systems
■653 ▼aQuantum algorithms
■653 ▼aQuantum computing
■653 ▼aQuantum control
■653 ▼aVirtual bond dimension
■690 ▼a0485
■690 ▼a0599
■690 ▼a0605
■690 ▼a0216
■71020▼aUniversity of California, Berkeley▼bChemistry.
■7730 ▼tDissertations Abstracts International▼g86-03B.
■790 ▼a0028
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17161890▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
