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quantum computation and simulation with superconducting qubits

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Chinese Physics B 2021年第8期30卷 1-17页

作者： Kaiyong He Xiao Geng Rutian Huang Jianshe Liu Wei Chen School of Integrated Circuits Tsinghua UniversityBeijing 100084China Beijing National Research Center for Information Science and Technology Beijing 100084China Tsinghua University Future Chip Technology Advanced Innovation Center Beijing 100084China

Superconducting circuits based on Josephson junctions are regarded as one of the most promising technologies for the implementation of scalable quantum *** review presents the basic principles of superconducting qubits and shows the progress of quantum computing and quantum simulation based on superconducting qubits in recent *** experimental realization of gate operations,readout,error correction codes,as well as some quantum algorithms are summarized,followed by an introduction of quantum *** then some important applications in fields including condensed matter physics,quantum annealing,and quantum chemistry are discussed.

关键词： quantum computation quantum simulation superconducting qubit

quantum computation and error correction based on continuous variable cluster states

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Chinese Physics B 2021年第6期30卷 18-27页

作者： Shuhong Hao Xiaowei Deng Yang Liu Xiaolong Su Changde Xie Kunchi Peng State Key Laboratory of quantum Optics and quantum Optics Devices Collaborative Innovation Center of Extreme OpticsInstitute of Opto-ElectronicsShanxi UniversityTaiyuan 030006China School of Mathematics and Physics Anhui University of TechnologyMaanshan 243000China Shenzhen Institute for quantum Science and Engineering Southern University of Science and TechnologyShenzhen 518055China

Measurement-based quantum computation with continuous variables,which realizes computation by performing measurement and feedforward of measurement results on a large scale Gaussian cluster state,provides a feasible way to implement quantum *** error correction is an essential procedure to protect quantum information in quantum computation and quantum *** this review,we briefly introduce the progress of measurement-based quantum computation and quantum error correction with continuous variables based on Gaussian cluster *** also discuss the challenges in the fault-tolerant measurement-based quantum computation with continuous variables.

关键词： quantum computation quantum error correction continuous variables cluster state

quantum computation with two-dimensional graphene quantum dots

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Chinese Physics B 2012年第1期21卷 442-448页

作者： Li Jie-Sen Li Zhi-Bing Yao Dao-Xin State Key Laboratory of Optoelectronic Materials and Technologies School of Physics and EngineeringSun Yat-sen UniversityGuangzhou 510275China

We study an array of graphene nano sheets that form a two-dimensional S = 1/2 Kagome spin lattice used for quantum computation. The edge states of the graphene nano sheets are used to form quantum dots to confine electrons and perform the computation. We propose two schemes of bang-bang control to combat decoherence and realize gate operations on this array of quantum dots. It is shown that both schemes contain a great amount of information for quantum computation. The corresponding gate operations are also proposed.

关键词： graphene quantum dot quantum computation Kagome lattice

quantum computation and simulation with vibrational modes of trapped ions

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Chinese Physics B 2021年第6期30卷 1-17页

作者： Wentao Chen Jaren Gan Jing-Ning Zhang Dzmitry Matuskevich Kihwan Kim Department of Physics Tsinghua UniversityBeijing 100084China Centre for quantum Technologies National University of Singapore3 Science Drive 2117543 SingaporeSingapore Beijing Academy of quantum Information Sciences Beijing 100193China Department of Physics National University of Singapore2 Science Drive 3117551 SingaporeSingapore

Vibrational degrees of freedom in trapped-ion systems have recently been gaining attention as a quantum resource,beyond the role as a mediator for entangling quantum operations on internal degrees of freedom,because of the large available Hilbert *** vibrational modes can be represented as quantum harmonic oscillators and thus offer a Hilbert space with infinite *** we review recent theoretical and experimental progress in the coherent manipulation of the vibrational modes,including bosonic encoding schemes in quantum information,reliable and efficient measurement techniques,and quantum operations that allow various quantum simulations and quantum computation *** describe experiments using the vibrational modes,including the preparation of non-classical states,molecular vibronic sampling,and applications in quantum *** finally discuss the potential prospects and challenges of trapped-ion vibrational-mode quantum information processing.

关键词： quantum computation quantum simulation trapped ions vibrational modes

quantum computation with surface-state electrons by rapid population passages

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Science China(Physics,Mechanics & Astronomy) 2014年第9期57卷 1718-1724页

作者： SHI Xuan WEI LianFu OH Choo Hiap quantum Optoelectronics Laboratory School of Physics and Technology Southwest Jiaotong University Centre for quantum Technologies and Department of Physics National University of Singapore State Key Laboratory of Optoelectronic Materials and Technologies School of Physics Science and Engineering Sun Yet-sen University

quantum computation requires coherently controlling the evolutions of ***,these manipulations are implemented by precisely designing the durations(such as theπ-pulses)of the Rabi oscillations and tunable interbit *** this requirement,herein we show that the desired population transfers between the logic states can be deterministically realized(and thus quantum computation could be implemented)both adiabatically and non-adiabatically,by performing the duration-insensitive quantum *** proposal is specifically demonstrated with the surface-state of electrons floating on the liquid helium,but could also be applied to the other artificially controllable systems for quantum computing.

关键词： quantum computation surface-state electrons rapid population passages

quantum computation with Two-Level Systems in Current-Biased Josephson Junction

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Communications in Theoretical Physics 2010年第5期53卷 855-860页

作者：余龙宝 Laboratory of quantum Information Technology ICMP and SPTE South China Normal University

We present a feasible scheme that realizes quantum computation using the two-level systems （TLSs） in Current-biased Josephson junction （CBJJ） under the present experimental technology. Effective manipulation of the TLSs by CBJJ serving as register qubit can be obtained, such as initialization, single-qubit rotations, two-qubit gates, entanglement generation, and read out, etc. In addition, we also discuss the experimental feasibility and efficiency of the scheme.

关键词： quantum computation two-level system superconducting qubit

quantum computation with Nonlinear Optics

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Communications in Theoretical Physics 2008年第1期49卷 107-110页

作者： LIU Yang ZHANG Wen-Hong ZHANG Cun-Lin LONG Gui-Lu Key Laboratory of Atomic and Molecular NanoSciences and Department of Physics Tsinghua University Beijing 100084China Department of Physics Capital Normal University Beijing 100037 China Tsinghua National Laboratory for Information Science and Technology Beijing 100084 China

We propose a scheme of quantum computation with nonlinear quantum optics. Polarization states of photons are used for qubits. Photons with different frequencies represent different qubits. Single qubit rotation operation is implemented through optical elements like the Faraday polarization rotator. Photons are separated into different optical paths, or merged into a single optical path using dichromatic mirrors. The controlled-NOT gate between two qubits is implemented by the proper combination of parametric up and down conversions. This scheme has the following features：（1） No auxiliary qubits are required in the controlled-NOT gate operation; （2） No measurement is required in the course of the computation; （3） It is resource efficient and conceptually simple.

关键词： quantum computation nonlinear optics parametric up(down)-conversion polarization modulator

Nonadiabatic holonomic quantum computation and its optimal control

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Science China(Information Sciences) 2023年第8期66卷 23-44页

作者： Yan LIANG Pu SHEN Tao CHEN Zheng-Yuan XUE Key Laboratory of Atomic and Subatomic Structure and quantum Control (Ministry of Education) School of Physics South China Normal University Guangdong Provincial Key Laboratory of quantum Engineering and quantum Materials Guangdong-Hong Kong Joint Laboratory of Quantum Matter Frontier Research Institute for PhysicsSouth China Normal University Hefei National Laboratory

The geometric phase has the intrinsic property of being resistant to some types of local noises as it only depends on global properties of the evolution path. Meanwhile, the non-Abelian geometric phase is in the matrix form, and thus can naturally be used to implement high performance quantum gates,i.e., the so-called holonomic quantum computation. This article reviews recent advances in nonadiabatic holonomic quantum computation, and focuses on various optimal control approaches that can improve the gate performance, in terms of gate fidelity and robustness. Besides, we also pay special attention to its possible physical realizations and some concrete examples of experimental realizations. Finally, with all these efforts, within state-of-the-art technology, the performance of the implemented holonomic quantum gates can outperform the conventional dynamical ones, under certain conditions.

关键词： quantum computation geometric phases quantum gates optimal control

A concise review of Rydberg atom based quantum computation and quantum simulation

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Chinese Physics B 2021年第2期30卷 1-22页

作者： Xiaoling Wu Xinhui Liang Yaoqi Tian Fan Yang Cheng Chen Yong-Chun Liu Meng Khoon Te Li You State Key Laboratory of Low Dimensional quantum Physics Department of PhysicsTsinghua UniversityBeijing 100084China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China CAS Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China Frontier Science Center for quantum Information Beijing 100084China Beijing Academy of quantum Information Sciences Beijing 100193China

quantum information processing based on Rydberg atoms emerged as a promising direction two decades *** experimental and theoretical progresses have shined exciting light on this *** this concise review,we will briefly introduce the basics of Rydberg atoms and their recent applications in associated areas of neutral atom quantum computation and *** shall also include related discussions on quantum optics with Rydberg atomic ensembles,which are increasingly used to explore quantum computation and quantum simulation with photons.

关键词： quantum computation quantum simulation Rydberg atom quantum nonlinear optics