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quantum simulation of particle pair creation near the event horizon

National Science Review 2020年第9期7卷 1476-1484页

作者： Yao Wang Chong Sheng Yong-Heng Lu Jun Gao Yi-Jun Chang Xiao-Ling Pang Tian-Huai Yang Shi-Ning Zhu Hui Liu Xian-Min Jin Center for Integrated quantum Information Technologies (IQIT) School of Physics and Astronomy and State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University National Laboratory of Solid State Microstructures and School of Physics Collaborative Innovation Center of Advanced MicrostructuresNanjing University CAS Center for Excellence and Synergetic Innovation Center in quantum Information and quantum Physics University of Science and Technology of China

Though it is still a big challenge to unify general relativity and quantum mechanics in modern physics, the theory of quantum field related with the gravitational effect has been well developed and some striking phenomena are predicted, such as Hawking radiation. However, the direct measurement of these quantum effects under general relativity is far beyond present experiment techniques. Fortunately, the emulation of general relativity phenomena in the laboratory has become accessible in recent years. However, up to now,these simulations are limited either in classical regime or in flat space whereas quantum simulation related with general relativity is rarely involved. Here we propose and experimentally demonstrate a quantum evolution of fermions in close proximity to an artificial black hole on a photonic chip. We successfully observe the acceleration behavior, quantum creation, and evolution of a fermion pair near the event horizon:a single-photon wave packet with positive energy escapes from the black hole while negative energy is captured. Our extensible platform not only provides a route to access quantum effects related with general relativity, but also has the potentiality to investigate quantum gravity in future.

关键词： quantum simulation general relativity transform optics particle pair creation black hole

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quantum simulation of lattice gauge theories on superconducting circuits:quantum phase transition and quench dynamics

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Chinese Physics B 2022年第2期31卷 217-222页

作者： Zi-Yong Ge Rui-Zhen Huang Zi-Yang Meng Heng Fan Beijing Nntional Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100190China Kuvli Institute for Theoretical Sciences University of Chinese Academy of SciencesBeijing 100190China Songshan Lake Materials Laboratory Dongguan 523808China Department of Physics and HKU-UCAS Joint Institute of Theoretical and Computational Physics The University of Hong Kong.Hong Kong SARChina CAS Center for Excellence in Topological quantum Computation.University of Chinese Academy of Sciences.Beijing 100190 China

Recently,quantum simulation of low-dimensional lattice gauge theories(LGTs)has attracted many interests,which may improve our understanding of strongly correlated quantum many-body ***,we propose an implementation to approximate Z;LGT on superconducting quantum circuits,where the effective theory is a mixture of a LGT and a gauge-broken *** using matrix product state based methods,both the ground state properties and quench dynamics are systematically *** an increase of the transverse(electric)field,the system displays a quantum phase transition from a disordered phase to a translational symmetry breaking *** the ordered phase,an approximate Gauss law of the Z;LGT emerges in the ground ***,to shed light on the experiments,we also study the quench dynamics,where there is a dynamical signature of the spontaneous translational symmetry *** spreading of the single particle of matter degree is diffusive under the weak transverse field,while it is ballistic with small velocity for the strong ***,due to the emergent Gauss law under the strong transverse field,the matter degree can also exhibit confinement dynamics which leads to a strong suppression of the nearest-neighbor *** results pave the way for simulating the LGT on superconducting circuits,including the quantum phase transition and quench dynamics.

关键词： quantum simulation superconducting circuits lattice gauge theories

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quantum simulation and quantum computation of noisy-intermediate scale

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Chinese Physics B 2022年第10期31卷 1-7页

作者： Kai Xu Heng Fan Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Beijing Academy of quantum Information Sciences Beijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100190China CAS Center of Excellence in Topological quantum Computation University of Chinese Academy of SciencesBeijing 100190China Songshan Lake Materials Laboratory Dongguan 523808China

In the past years, great progresses have been made on quantum computation and quantum simulation. Increasing the number of qubits in the quantum processors is expected to be one of the main motivations in the next years, while noises in manipulation of quantum states may still be inevitable even the precision will improve. For research in this direction, it is necessary to review the available results about noisy multiqubit quantum computation and quantum simulation. The review focuses on multiqubit state generations, quantum computational advantage, and simulating physics of quantum many-body systems. Perspectives of near term noisy intermediate-quantum processors will be discussed.

关键词： quantum computation quantum simulation many-body physics quantum supremacy noisy intermediate-scale quantum technologies

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quantum simulation of τ-anti-pseudo-Hermitian two-level systems

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Chinese Physics B 2022年第10期31卷 182-188页

作者： Chao Zheng Department of Physics College of ScienceNorth China University of TechnologyBeijing 100144China

Different from the Hermitian case, non-Hermitian(NH) systems have novel properties and strongly relate to open and dissipative quantum systems. In this work, we investigate how to simulate τ-anti-pseudo-Hermitian systems in a Hermitian quantum device using linear combinations of unitaries and duality quantum algorithm. Specifying the τ to time-reversal(T) and parity-time-reversal(PT) operators, we construct the two NH two-level systems, design quantum circuits including three qubits, and decide the quantum gates explicitly in detail. We also calculate the success probabilities of the *** implementation can be expected in small quantum simulator.

关键词： quantum simulation linear combination of unitaries non-Hermitian anti-pseudo-Hermitian

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quantum simulation of Hofstadter butterfly with synthetic gauge fields on two-dimensional superconducting-qubit lattices

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Frontiers of physics 2023年第6期18卷 283-290页

作者： Wei Feng Dexi Shao Guo-Qiang Zhang Qi-Ping Su Jun-Xiang Zhang Chui-Ping Yang School of Physics Hangzhou Normal UniversityHangzhou 311121China School of Physics Zhejiang UniversityHangzhou 310027China

Motivated by recent realizations of two-dimensional(2D)superconducting-qubit lattices,we propose a protocol to simulate Hofstadter butterfly with synthetic gauge fields in superconducting *** on the existing 2D superconducting-qubit lattices,we construct a generalized Hofstadter model on zigzag lattices,which has a fractal energy spectrum similar to the original Hofstadter *** periodically modulating the resonant frequencies of qubits,we engineer a synthetic gauge field to mimic the generalized Hofstadter Hamiltonian.A spectroscopic method is used to demonstrate the Hofstadter butterfly from the time evolutions of experimental *** numerically simulate the dynamics of the system with realistic parameters,and the results show a butterfly spectrum *** proposal provides a promising way to realize the Hofstadter butterfly on the latest 2D superconducting-qubit lattices and will stimulate the quantum simulation of novel properties induced by magnetic fields in superconducting circuits.

关键词： quantum simulation superconducting circuits superconducting qubit quantum computation

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quantum simulation of ‘zitterbewegung' in a single trapped ion under conditions of parity-keeping and parity-breaking

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Science China(Physics,Mechanics & Astronomy) 2014年第7期57卷 1250-1255页

作者： LIU Tao FENG Mang YANG WanLi CHEN Liang ZHOU Fei WANG KeLin State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and MathematicsChinese Academy of Sciences School of Science Southwest University of Science and Technology Department of Modern Physics University of Science and Technology of China

The motional trembling(‘zitterbewegung’)of a relativistic electron governed by Dirac equation was originally predicted by Schr¨odinger in the early days of quantum mechanics and simulated in a recent experiment with a single trapped ultracold *** investigate stable and instable confinements of a single trapped ion in a Paul trap under different conditions relevant to *** our treatment involves neither restriction of Lamb-Dicke limit nor rotating-wave approximation,we may demonstrate different quantum dynamics of the single trapped ion in a wide range of the trapping *** discuss the origin of the zitterbewegung which is relevant to the stability of the ion trapping.

关键词： quantum simulation trapped ion zitterbewegung

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quantum simulation of molecular interaction and dynamics at surfaces

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Frontiers of physics 2011年第3期6卷 294-308页

作者： Zi-jing DING Yang JIAO Sheng MENG Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of Sciences Beijing 100190 China

The interaction between molecules and solid surfaces plays important roles in various applications, including catalysis, sensors, nanoelectronies, and solar cells. Surprisingly, a full understanding of molecule-surface interaction at the quantum mechanical level has not been achieved even for very simple molecules, such as water. In this mini-review, we report recent progresses and current status of studies on interaction between representative molecules and surfaces. Taking water/metal, DNA bases/carbon nanotube, and organic dye molecule/oxide as examples, we focus on the understanding on the microstructure, electronic property, and electron-ion dynamics involved in these systems obtained from first-principles quantum mechanical calculations. We find that a quantum mechanical description of molecule surface interaction is essential for understanding interface phenomenon at the microscopic level, such as wetting. New theoretical developments, including van der Waals density functional and quantum nuclei treatment, improve further our understanding of surface interactions.

关键词： adsorption quantum simulation density functional theory electronic structure electrondynamics

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quantum simulation of a general anti-PT-symmetric Hamiltonian with a trapped ion qubit

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Fundamental Research 2023年第6期3卷 904-908页

作者： Ji Bian Pengfei Lu Teng Liu Hao Wu Xinxin Rao Kunxu Wang Qifeng Lao Yang Liu Feng Zhu Le Luo School of Physics and Astronomy Sun Yat-Sen UniversityZhuhai 519082China Center of quantum Information Technology Shenzhen Research Institute of Sun Yat-sen UniversityShenzhen 518087China State Key Laboratory of Optoelectronic Materials and Technologies Sun Yat-Sen University(Guangzhou Campus)Guangzhou 510275China

Non-Hermitian systems satisfying parity-time(PT)symmetry have aroused considerable interest owing to their exotic ***-PT symmetry is an important counterpart of the symmetry,and has been studied in various classical *** a Hamiltonian with anti-PT symmetry only differs from its PT-symmetric counterpart in a global phase,the information and energy exchange between systems and environment are different under *** is also suggested theoretically that anti-PT symmetry is a useful concept in the context of quantum information storage with qubits coupled to a bosonic *** far,the observation of anti-PT symmetry in individual quantum systems remains ***,we implement an anti-PT-symmetric Hamiltonian of a single qubit in a single trapped ion by a designed microwave and optical control-pulse *** characterize the anti-PT phase transition by mapping out the eigenvalues at different ratios between coupling strengths and dissipation *** full information of the quantum state is also obtained by quantum state *** work allows quantum simulation of genuine open-system feature of an anti-PT-symmetric system,which paves the way for utilizing non-Hermitian properties for quantum information processing.

关键词： Open quantum system Non-Hermitian quantum mechanics Parity-time symmetry Anti-parity-time symmetry quantum simulation

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Review of quantum simulation based on Rydberg many-body system

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Chinese Physics B 2021年第2期30卷 35-44页

作者： Zheng-Yuan Zhang Dong-Sheng Ding Bao-Sen Shi Key Laboratory of quantum Information University of Science and Technology of ChinaHefei 230026China

quantum simulation has been developed extensively over the past decades,widely applied to different models to explore dynamics in the quantum *** atoms have strong dipole-dipole interactions and interact with each other over a long distance,which makes it straightforward to build many-body interacting quantum systems to simulate specific ***,neutral atoms are easily manipulated due to their weak *** advantages make Rydberg many-body system an ideal platform to implement quantum *** paper reviews several quantum simulations for different models based on Rydberg many-body systems,including quantum Ising models in one dimension and two dimensions mainly for quantum magnetism,XY model for excitation transport,SSH model for symmetry-protected topological phases,and critical self-organized behaviors in many-body ***,some challenges and promising directions of quantum simulations based on Rydberg many-body system are discussed in this paper.

关键词： many-body quantum simulation Rydberg

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Variational quantum simulation of the quantum critical regime

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Chinese Physics B 2023年第8期32卷 181-187页

作者：石志全谢旭丹张旦波 Guangdong Provincial Key Laboratory of quantum Engineering and quantum Materials School of Physics and Telecommunication EngineeringSouth China Normal UniversityGuangzhou 510006China Guangdong--Hong Kong Joint Laboratory of quantum Matter Frontier Research Institute for PhysicsSouth China Normal UniversityGuangzhou 510006China

The quantum critical regime marks a zone in the phase diagram where quantum fluctuation around the critical point plays a significant role at finite *** it is of great physical interest,simulation of the quantum critical regime can be difficult on a classical computer due to its intrinsic ***,we propose a variational approach,which minimizes the variational free energy,to simulate and locate the quantum critical regime on a quantum *** variational quantum algorithm adopts an ansatz by performing an unitary operator on a product of a single-qubit mixed state,in which the entropy can be analytically obtained from the initial state,and thus the free energy can be accessed *** numeral simulation,using the one-dimensional Kitaev model as a demonstration we show that the quantum critical regime can be identified by accurately evaluating the temperature crossover ***,the dependencies of both the correlation length and the phase coherence time with temperature are evaluated for the thermal *** work suggests a practical way as well as a first step for investigating quantum critical systems at finite temperatures on quantum devices with few qubits.

关键词： quantum algorithm quantum simulation quantum critical point

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