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64-qubit quantum circuit simulation

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Science Bulletin 2018年第15期63卷 964-971页

作者： Zhao-Yun Chen Qi Zhou Cheng Xue Xia Yang Guang-Can Guo Guo-Ping Guo CAS Key Laboratory of quantum information University of Science and Technology of China Hefei 230026 China origin quantum computing co.pany Limited Hefei 230026 China

Classical simulations of quantum circuits are limited in both space and time when the qubit co.nt is above 50, the realm where quantum supremacy reigns. However, recently, for the low depth circuit with more than 50 qubits, there are several methods of simulation proposed by teams at Google and IBM. Here,we present a scheme of simulation which can extract a large amount of measurement outco.es within a short time, achieving a 64-qubit simulation of a universal random circuit of depth 22 using a 128-node cluster, and 56-and 42-qubit circuits on a single PC. We also estimate that a 72-qubit circuit of depth 23 can be simulated in about 16 h on a superco.puter identical to that used by the IBM team. Moreover, the simulation processes are exceedingly separable, hence parallelizable, involving just a few inter-process co.munications. Our work enables simulating more qubits with less hardware burden and provides a new perspective for classical simulations.

关键词： Simulation of quantum circuits Universal random circuit quantum supremacy Partitioning Parallel computing

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 co.sider 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 co.t 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

Circuit quantum electrodynamics with a quadruple quantum dot

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Chinese Physics B 2023年第7期32卷 150-155页

作者：林霆李海欧曹刚郭国平 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 origin quantum computing co.pany Limited Hefei 230088China

In this theoretical work,we describe a mechanism for the co.pling between a plane structure co.sisting of four quantum dots and a *** systematically study the dependence of the quadruple co.pling strength and the qubit deco.erence rate and point out the optimized operating position of the hybrid *** to the transmission given by the input-output theory,the signatures in the resonator spectrum are ***,based on the parameters already achieved in previous works,we prove that the device described in this paper can achieve the strong co.pling limit,i.e.,this approach can be used for system extension under the existing technical *** results show an effective and promotable approach to co.ple quantum dot structures in plane with the resonator and propose a meaningful extension method.

关键词： semico.ductor qubit circuit quantum electrodynamics(QED) semico.ductor quantum dot scalable semico.ductor-based circuit QED architectures

co.erent manipulation of a tunable hybrid qubit via microwave co.trol

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Chinese Physics B 2023年第8期32卷 409-414页

作者：顾思思王保传李海欧曹刚郭国平 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 origin quantum computing co.pany Limited Hefei 230026China

Hybrid qubits enable the hybridization of charge and spin degrees of freedom,which provides a way to realize both a relatively long co.erence time and rapid qubit ***,we use microwave driving to demonstrate the co.erent operation of a tunable hybrid qubit,including X-rotation,Z-rotation,and rotation around an arbitrary axis in the X-Y panel of the Bloch ***,the co.erence properties of the qubit and its tunability are *** measured co.erence time of the X-rotation reaches~14.3 *** for the Z-rotation,the maximum deco.erence time is~5.8 ns due to the larger sensitivity to *** employing the Hahn echo sequence to mitigate the influence of the low-frequency noise,we have improved the qubit co.erence time from~5.8 ns to~15.0 *** results co.tribute to a further understanding of the hybrid qubit and a step towards achieving high-fidelity qubit gates in the hybrid qubit.

关键词： semico.ductor quantum dot hybrid qubit qubit operation microwave co.trol

Experimental realization of deterministic joint remote preparation of an arbitrary two-qubit pure state via GHZ states

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Science China(Information Sciences) 2024年第3期67卷 317-318页

作者： Nachuan LI Lu XU Jin-Ming LIU State Key Laboratory of Precision Spectrosco.y School of Physics and Electronic ScienceEast China Normal University hefei origin quantum computing technology co. Ltd.

quantum teleportation(QT) [1] enables secure transfer of an unknown quantum state between remote locations without physically transmitting the initial state. Unlike QT,with the sender possessing co.plete knowledge of the initial state, remote state preparation(RSP) [2] exhibits a tradeoff between the amount of the entanglement resource used and the classical co.munication co.t.

关键词： quantum co.munication

Micro-scale photon source in a hybrid cQED system

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Chinese Physics B 2021年第4期30卷 92-96页

作者： Ming-Bo Chen Bao-Chuan Wang Si-Si Gu Ting Lin Hai-Ou Li Gang Cao Guo-Ping Guo Key Laboratory of quantum Information CASUniversity 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 origin quantum computing co.pany Limited Hefei 230026China

co.erent photon source is an important element that has been widely used in spectrosco.y,imaging,detection,and teleportation in quantum ***,it is still a challenge to realize micro-scale co.erent emitters in semico.ductor *** report the observation of gain in a cavity-co.pled GaAs double quantum dot system with a voltage bias across the *** characterizing and analyzing the cavity responses to different quantum dot behaviors,we distinguish the microwave photon emission from the signal *** study provides a possibility to realize micro-scale amplifiers or co.erent microwave photon sources in circuit quantum electrodynamics(cQED) hybrid systems.

关键词： SQUID array resonator double quantum dot electron-photon co.pling photon emission

Energy shift and subharmonics induced by nonlinearity in a quantum dot system

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Chinese Physics B 2023年第6期32卷 135-139页

作者：周圆曹刚李海欧郭国平 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 origin quantum computing co.pany Limited Hefei 230026China

The presence of anticrossings induced by co.pling between two states causes curvature in energy levels, yielding a nonlinearity in the quantum system. When the system is driven back and forth along the bending energy levels, subharmonic transitions and energy shifts can be observed, which would cause a significant influence as the system is applied to quantum computing. In this paper, we study a longitudinally driven singlet-triplet(ST) system in a double quantum dot(DQD)system, and illustrate the co.sequences of nonlinearity by driving the system close to the anticrossings. We provide a straightforward theory to quantitatively describe the energy shift and subharmonics caused by nonlinearity, and find good agreement between our theoretical result and the numerical simulation. Our results reveal the existence of nonlinearity in the vicinity of anticrossings and provide a direct way of analytically assessing its impact, which can be applied to other quantum systems without excessive labor.

关键词： quantum dot quantum computing nonlinear physics

co.pling and characterization of a Si/SiGe triple quantum dot array with a microwave resonator

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Chinese Physics B 2024年第9期33卷 139-143页

作者： Shun-Li Jiang Tian-Yi Jiang Yong-Qiang Xu Rui Wu Tian-Yue Hao Shu-Kun Ye Ran-Ran Cai 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 origin quantum computing co.pany Limited Hefei 230088China

Scaling up spin qubits in silico.-based quantum dots is one of the pivotal challenges in achieving large-scale semico.ductor quantum *** satisfy the co.nectivity requirements and reduce the lithographic co.plexity,utilizing the qubit array structure and the circuit quantum electrodynamics(cQED)architecture together is expected to be a feasible scaling scheme.A triple-quantum dot(TQD)co.pled with a superco.ducting resonator is regarded as a basic cell to demonstrate this extension *** this article,we investigate a system co.sisting of a silico. TQD and a high-impedance TiN co.lanar waveguide(CPW)*** TQD can co.ple to the resonator via the right double-quantum dot(RDQD),which reaches the strong co.pling regime with a charge–photon co.pling strength of g0/(2p)=175 ***,we illustrate the high tunability of the TQD through the characterization of stability diagrams,quadruple points(QPs),and the quantum cellular automata(QCA)*** results co.tribute to fostering the exploration of silico.-based qubit integration.

关键词： triple-quantum dot strong co.pling circuit quantum electrodynamics(cQED) scalable silico.based cQED architectures

co.pling and readout of semico.ductor quantum dots with a superco.ducting 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 co.pany Limited Hefei 230088China

In a circuit quantum electrodynamics(circuit QED) architecture, the microwave resonator co.ld be used to co.ple and probe qubits. The long-range co.pling 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 co.posed of a microwave resonator and semico.ductor qubits have been achieved in recent years. For instance,with applications of high-impedance microwave resonators, the strong co.pling 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 co.pling strength. Here, we briefly introduce this hybrid system related to the progress and fruits in achieving the strong co.pling between charge/spin qubits in double quantum dots(DQDs)and the resonator, the long-range co.pling between qubits, and also the applications of the resonator for qubit state readout.

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