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Semiconductor quantum computation

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National Science Review 2019年第1期6卷 32-54页

作者： Xin Zhang Hai-Ou Li Gang Cao Ming Xiao Guang-Can guo guo-ping guo Key Laboratory of Quantum Information CAS University of Science and Technology of China Synergetic Innovation Center of Quantum Information & Quantum Physics University of Science and Technology of China

Semiconductors, a significant type of material in the information era, are becoming more and more powerful in the field of quantum information. In recent decades, semiconductor quantum computation was investigated thoroughly across the world and developed with a dramatically fast speed. The research varied from initialization, control and readout of qubits, to the architecture of fault-tolerant quantum ***, we first introduce the basic ideas for quantum computing, and then discuss the developments of single-and two-qubit gate control in semiconductors. Up to now, the qubit initialization, control and readout can be realized with relatively high fidelity and a programmable two-qubit quantum processor has even been demonstrated. However, to further improve the qubit quality and scale it up, there are still some challenges to resolve such as the improvement of the readout method, material development and scalable designs. We discuss these issues and introduce the forefronts of progress. Finally, considering the positive trend of the research on semiconductor quantum devices and recent theoretical work on the applications of quantum computation, we anticipate that semiconductor quantum computation may develop fast and will have a huge impact on our lives in the near future.

关键词： semiconductor quantum dot qubit quantum computation spin manipulation

Multipartite Spin Entangled States in Quantum Dots with a Quantum Databus Based on Nano Electro-Mechanical Resonator

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Chinese Physics Letters 2011年第4期28卷 19-21页

作者： ZHU Zhi-Cheng TU Tao guo guo-ping Key Laboratory of Quantum Information Chinese Academy of SciencesUniversity of Science and Technology of ChinaHefei 230026

We propose an efficient method to create multipartite spin entangled states in quantum dots coupled to a nano electro-mechanical resonator *** method,based on the interaction between electron spins confined in quantum dots and the motion of magnetized nano electro-mechanical resonators,can enable a coherent spin-spin coupling over long distances and in principle be applied to an arbitrarily large number of electronic spins.

关键词： quantum arbitrarily parti

Variational Quantum Algorithms for the Steady States of Open Quantum Systems

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Chinese Physics Letters 2021年第8期38卷 11-16页

作者： Huan-Yu Liu Tai-ping Sun Yu-Chun Wu guo-ping guo Key Laboratory of Quantum Information Chinese Academy of SciencesSchool of PhysicsUniversity of Science and Technology of ChinaHefei 230026China CAS Center For Excellence in Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei 230026China Institute of Artificial Intelligence Hefei Comprehensive National Science CenterHefei 230088China Origin Quantum Computing Hefei Hefei 230026China

The solutions of the problems related to open quantum systems have attracted considerable *** propose a variational quantum algorithm to find the steady state of open quantum *** this algorithm,we employ parameterized quantum circuits to prepare the purification of the steady state and define the cost function based on the Lindblad master equation,which can be efficiently evaluated with quantum *** then optimize the parameters of the quantum circuit to find the steady *** simulations are performed on the one-dimensional transverse field Ising model with dissipative *** result shows that the fidelity between the optimal mixed state and the true steady state is over 99%.This algorithm is derived from the natural idea of expressing mixed states with purification and it provides a reference for the study of open quantum systems.

关键词： state quantum mixed

Spin manipulation in semiconductor quantum dots qubit

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Chinese Physics B 2018年第9期27卷 1-14页

作者： Ke Wang Hai-Ou L Ming Xiao Gang Cao and guo-ping guo CAS Key Laboratory of Quantum Information University of Science and Technology of ChinaHefei 230026China

Thirty years of effort in semiconductor quantum dots has resulted in significant developments in the control of spin quantum bits（qubits）. The natural two-energy level of spin states provides a path toward quantum information processing. In particular, the experimental implementation of spin control with high fidelity provides the possibility of realizing quantum computing. In this review, we will discuss the basic elements of spin qubits in semiconductor quantum dots and summarize some important experiments that have demonstrated the direct manipulation of spin states with an applied electric field and/or magnetic field. The results of recent experiments on spin qubits reveal a bright future for quantum information processing.

关键词： semiconductor quantum dot qubits spin manipulation

Effects of Quantum Noise on Quantum Approximate Optimization Algorithm

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Chinese Physics Letters 2021年第3期38卷 7-11页

作者： Cheng Xue Zhao-Yun Chen Yu-Chun Wu guo-ping guo Key Laboratory of Quantum Information Chinese Academy of SciencesSchool of PhysicsUniversity of Science and Technology of ChinaHefei 230026China Origin Quantum Computing Hefei Hefei 230026China

The quantum-classical hybrid algorithm is a promising algorithm with respect to demonstrating the quantum advantage in noisy-intermediate-scale quantum(NISQ) devices. When running such algorithms, effects due to quantum noise are inevitable. In our work, we consider a well-known hybrid algorithm, the quantum approximate optimization algorithm(QAOA). We study the effects on QAOA from typical quantum noise channels, and produce several numerical results. Our research indicates that the output state fidelity, i.e., the cost function obtained from QAOA, decreases exponentially with respect to the number of gates and noise strength. Moreover,we find that when noise is not serious, the optimized parameters will not deviate from their ideal values. Our result provides evidence for the effectiveness of hybrid algorithms running on NISQ devices.

关键词： strength. quantum exponentially

Optoelectronic properties of bottom gate-defined in-plane monolayer WSe_2 p–n junction

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Chinese Physics B 2018年第8期27卷 476-481页

作者： Di Liu Xiao-Zhuo Qi Takashi Taniguchi Xi-Feng Ren guo-ping guo Key Laboratory of Quantum Information University of Science and Technology of ChinaChinese Academy of SciencesHefei 230026China Synergetic Innovation Center of Quantum Information&Quantum Physics University of Science and Technology of ChinaHefei 230026China National Institute for Materials Science Namiki 1-1Ibaraki 305-0044Japan

Monolayer transition-metal dichalcogenides （TMDs） are considered to be fantastic building blocks for a wide variety of optical and optoelectronic devices such as sensors, photodetectors, and quantum emitters, owing to their direct band gap, transparency, and mechanical flexibility. The core element of many conventional electronic and optoelectronic devices is the p-n junction, in which the p- and n-types of the semiconductor are formed by chemical doping in different regions. Here, we report a series of optoelectronic studies on a monolayer WSe2 in-plane p-n photodetector, demonstrating a low- power dissipation by showing an ambipolar behavior with a reduced threshold voltage by a factor of two compared with the previous results on a lateral electrostatically doped WSe2 p-n junction. The fabrication of the device is based on a polycarbonates （PC） transfer technique and hence no electron-beam exposure induced damage to the monolayer WSe2 is expected. Upon optical excitation, the photodetector demonstrates a photoresponsivity of 0.12 mA.W-1 and a maximum external quantum efficiency of 0.03%. Our study provides an alternative platform for a flexible and transparent two- dimensional photodetector, from which we expect to further promote the development of next-generation optoelectronic devices.

关键词： WSe2, photodetector transfer technique p-n junction

Transport through a Gate Tunable Graphene Double Quantum Dot

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Chinese Physics Letters 2012年第11期29卷 194-197页

作者： ZHOU Cheng TU Tao WANG Li LI Hai-Ou CAO Gang guo Guang-Can guo guo-ping Key Laboratory of Quantum Information University of Science and Technology of ChinaChinese Academy of SciencesHefei 230026

We demonstrate how molecular states of coupled graphene quantum dots are probed in transport *** applied method measures the sequential tunneling of electrons through the double dot and hence resolves the molecular state transport channel *** overlap of the two dots'wavefunctions,and in turn,the tunnel coupling between the two dots are controlled by the local *** results imply the relevance of our graphene device for implementing a quantum manipulation by adjusting the electrodes.

关键词： hence overlap Quantum

Coupling and readout of semiconductor quantum dots with a superconducting microwave resonator

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Science China(Physics,Mechanics & Astronomy) 2023年第3期66卷 1-10页

作者： Yong-Qiang Xu Si-Si Gu Ting Lin Bao-Chuan Wang Hai-Ou Li Gang Cao guo-ping guo CAS Key Laboratory of Quantum Information University of Science and Technology of ChinaHefei 230026China CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei 230026China Hefei National Laboratory University of Science and Technology of ChinaHefei 230088China Origin Quantum Computing Company Limited Hefei 230088China

In a circuit quantum electrodynamics(circuit QED) architecture, the microwave resonator could be used to couple and probe qubits. The long-range coupling and information transfer between nonlocal qubits can be performed via photons trapped in a microwave resonator, promising an effective approach for scaling up solid-state qubits. A series of important advances in the hybrid system composed of a microwave resonator and semiconductor qubits have been achieved in recent years. For instance,with applications of high-impedance microwave resonators, the strong coupling regime between charge/spin qubits and a microwave resonator has been reached. Simultaneously, resonator-based dispersive readout and single-shot readout to probe the qubit state have been further improved due to the increase of the coupling strength. Here, we briefly introduce this hybrid system related to the progress and fruits in achieving the strong coupling between charge/spin qubits in double quantum dots(DQDs)and the resonator, the long-range coupling between qubits, and also the applications of the resonator for qubit state readout.

关键词： quantum dots hybrid system circuit QED strong coupling long-range coupling qubit state readout

Pulse Designed Coherent Dynamics of a Quantum Dot Charge Qubit

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Chinese Physics Letters 2012年第3期29卷 29-32页

作者： CAO Gang WANG Li TU Tao LI Hai-Ou XIAO Ming guo guo-ping Key Laboratory of Quantum Information University of Science and Technology of ChinaHefei 230026

We propose an effective method to design the working parameters of a pulse-driven charge qubit implemented with double quantum *** is shown that intrinsic qubit population leakage to undesired states in the control and measurement process can be determined by the simulation of coherent dynamics of the qubit and minimized by choosing proper working parameters such as pulse *** result demonstrated here bodes well for future quantum gate operations and quantum computing applications.

关键词： quantum operations desired