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| 1 | Erratum to: Realistic interpretation of quantum mechanics and encounter-delayed-choice experiment [Sci. China-Phys. Mech. Astron. 61, 030311 (2018)]显示文摘 | GuiLu Long Wei Qin Zhe Yang Jun-Lin Li | 2018 | Science China(Physics,Mechanics & Astronomy)2018，61，5： | 9 |
| 2 | Bang-bang control suppression of amplitude damping in a three-level atom显示文摘By using quantum bang-bang control technique,we studied the suppression of amplitude damping,or energy dissipation,in a three-level atom in various configurations.We have explicitly given the bang-bang control groups in three different configurations,and the pulse sequences for these bang-bang control operations. | CAO WanCang LIU XiaoShu BAI HongBo LONG GuiLu | 2008 | Science China(Physics,Mechanics & Astronomy)2008，51，1： | 8 |
| 3 | Entropy product measure for multipartite pure states显示文摘An entanglement measure for multipartite pure states is formulated using the product of the von Neumann entropy of the reduced density matrices of the constituents. Based on this new measure, all possible ways of the maximal entanglement of the triqubit pure states are studied in detail and all types of the maximal entanglement have been compared with the result of ‘the average entropy’. The new measure can be used to calculate the degree of entanglement, and an improvement is given in the area near the zero entropy. | CAO Wancang1,2, LIU Dan2, PAN Feng3 & LONG Guilu2,4 1. Department of Physics, Chifeng College, Chifeng 024001, China 2. Key Laboratory for Quantum Information and Measurements, Department of Physics, Tsinghua University, Beijing 100084, China 3. Department of Physics, Liaoning Normal University, Dalian 116029, China 4. Key Laboratory for Atomic and Molecular Nano-Sciences, Tsinghua University, Beijing 100084, China Correspondence should be addressed to Long Guilu | 2006 | Science China(Physics,Mechanics & Astronomy)2006，49，5： | 8 |
| 4 | Entanglement of linear cluster states in terms of averaged entropies显示文摘An entanglement measure,multiple entropy measures(MEMS) was proposed recently by using the geometric mean of partial entropies over all possible i-body combinations of the quantum system.In this work,we study the average subsystem von Neumann entropies of the linear cluster state and investigated the quantum entanglement of linear cluster states in terms of MEMS.Explicit results with specific particle numbers are calculated,and some analytical results are given for systems with arbitrary particle numbers.Compared with other example quantum states such as the GHZ states and W states,the linear cluster states are 'more entangled' in terms of MEMS,namely their averaged entropies are larger than the GHZ states and W states. | CAO Ye LI Hui LONG GuiLu | 2013 | Chinese Science Bulletin2013，58，1： | 6 |
| 5 | Influence of magnetic current on the ground state entanglement in an isotropic transverse XY chain显示文摘We study the ground state entanglement in a three-qubit XY chain under the influence of a magnetization current. It is found that the ground state changes from a W state to a disentangled state as the magnetic field varies. When the Lagrange multiplier λ>3, namely under a strong magnetic current, the ground state holds onto a W state for a large range of the magnetic field strength. A phase transition to the magnetization-current phase occurs under a certain condition. | Liu Dan Zhang Yong Long Guilu | 2007 | Progress in Natural Science:Materials International2007，17，10： | 6 |
| 6 | Measurement-device-independent quantum secure direct communication显示文摘Quantum secure direct communication(QSDC)is a unique technique,which supports the secure transmission of confidential information directly through a quantum channel without the need for a secret key and for ciphertext.Hence this secure communication protocol fundamentally differs from its conventional counterparts.In this article,we report the first measurement-deviceindependent(MDI)QSDC protocol relying on sequences of entangled photon pairs and single photons.Explicitly,it eliminates the security loopholes associated with the measurement device.Additionally,this MDI technique is capable of doubling the communication distance of its conventional counterpart operating without using our MDI technique.We also conceive a protocol associated with linear optical Bell-basis measurements,where only two of the four Bell-basis states could be measured.When the number of qubits in a sequence reduces to 1,the MDI-QSDC protocol degenerates to a deterministic MDI quantum key distribution protocol. | ZengRong Zhou Yu Bo Sheng PengHao Niu LiuGuo Yin GuiLu Long Lajos Hanzo | 2020 | Science China(Physics,Mechanics & Astronomy)2020，63，3： | 6 |
| 7 | Simulation of general three-body interactions in a nuclear magnetic resonance ensemble quantum computer显示文摘Three-body interaction plays an important role in many-body physics,and quantum computer is efficient in simulating many-body interactions. We have experimentally demonstrated the general three-body interactions in a three-qubit nuclear magnetic resonance ensemble quantum computer. Using a nuclear magnetic resonance computer we implemented general forms of three-body interactions including σ 1x σ z2 σ x3 and σ 1x σ z2 σ y3 . The results show good agreement between theory and experiment. We have also given a concise and practical formula for a general n-body interaction in terms of one-and two-body interactions. | LIU WenZhang ZHANG JingFu DENG ZhiWei LONG GuiLu | 2008 | Science China(Physics,Mechanics & Astronomy)2008，51，8： | 6 |
| 8 | NMRCloudQ: a quantum cloud experience on a nuclear magnetic resonance quantum computer显示文摘Cloud-based quantum computing is anticipated to be the most useful and reachable form for public users to experience with the power of quantum. As initial attempts, IBM Q has launched influential cloud services on a superconducting quantum processor in 2016, but no other platforms has followed up yet. Here,we report our new cloud quantum computing service – NMRCloud Q(http://gffzz93b8cbf03a7349b1h609vck5qkf6060xb.ffgz.tsg.suse.edu.cn/zh-hans/),where nuclear magnetic resonance, one of the pioneer platforms with mature techniques in experimental quantum computing, plays as the role of implementing computing tasks. Our service provides a comprehensive software environment preconfigured with a list of quantum information processing packages,and aims to be freely accessible to either amateurs that look forward to keeping pace with this quantum era or professionals that are interested in carrying out real quantum computing experiments in person. In our current version, four qubits are already usable with in average 99.10% single-qubit gate fidelity and 97.15% two-qubit fidelity via randomized benchmaking tests. Improved control precisions as well as a new seven-qubit processor are also in preparation and will be available later. | Tao Xin Shilin Huang Sirui Lu Keren Li Zhihuang Luo Zhangqi Yin Jun Li Dawei Lu Guilu Long Bei Zeng | 2018 | Science Bulletin2018，63，1： | 5 |
| 9 | Experimental realization of single-shot nonadiabatic holonomic gates in nuclear spins显示文摘Nonadiabatic holonomic quantum computation has received increasing attention due to its robustness against control errors.However,all the previous schemes have to use at least two sequentially implemented gates to realize a general one-qubit gate.Based on two recent reports,we construct two Hamiltonians and experimentally realized nonadiabatic holonomic gates by a single-shot implementation in a two-qubit nuclear magnetic resonance(NMR)system.Two noncommuting one-qubit holonomic gates,rotating along x?and z?axes respectively,are implemented by evolving a work qubit and an ancillary qubit nonadiabatically following a quantum circuit designed.Using a sequence compiler developed for NMR quantum information processor,we optimize the whole pulse sequence,minimizing the total error of the implementation.Finally,all the nonadiabatic holonomic gates reach high unattenuated experimental fidelities over 98%. | Hang Li Yang Liu GuiLu Long | 2017 | Science China(Physics,Mechanics & Astronomy)2017，60，8： | 5 |
| 10 | Experimental implementation of a fixed-point duality quantum search algorithm in the nuclear magnetic resonance quantum system显示文摘In this work, we demonstrated a fixed-point quantum search algorithm in the nuclear magnetic resonance (NMR) system. We constructed the pulse sequences for the pivotal operations in the quantum search protocol. The experimental results agree well with the theoretical predictions. The generalization of the scheme to the arbitrary number of qubits has also been given. | HAO Lianga LONG GuiLu | 2011 | Science China(Physics,Mechanics & Astronomy)2011，54，5： | 5 |
| 11 | Simulation of the four-body interaction in a nuclear magnetic resonance quantum information processor显示文摘The four-body interaction plays an important role in many-body systems, and it can exhibit interesting phase transition behaviors. In this letter, we report the experimental demonstration of a four-body interaction in a four-qubit nuclear magnetic resonance quantum information processor. The strongly modulating pulse is used to implement spin selective excitation. The results show a good agreement between theory and experiment. | LIU WenZhang ZHANG JingFu LONG GuiLu | 2009 | Chinese Science Bulletin2009，54，22： | 5 |
| 12 | Experimental quantum deletion in an NMR quantum information processor显示文摘We report an NMR experimental realization of a rapid quantum deletion algorithm that deletes marked states in an unsorted database.Unlike classical deletion,where search and deletion are equivalent,quantum deletion can be implemented with only a single query,which achieves exponential speed-up compared to the optimal classical analog.In the experimental realization,the GRAPE algorithm was used to obtain an optimized NMR pulse sequence,and the efficient method of maximum-likelihood has been used to reconstruct the experimental output state. | LONG Yu FENG GuanRu PEARSON Jasong LONG GuiLu | 2014 | Science China(Physics,Mechanics & Astronomy)2014，57，7： | 3 |
| 13 | A Full Quantum Eigensolver for Quantum Chemistry Simulations显示文摘Quantum simulation of quantum chemistry is one of the most compelling applications of quantum computing.It is of particular importance in areas ranging from materials science,biochemistry,and condensed matter physics.Here,we propose a full quantum eigensolver(FQE)algorithm to calculate the molecular ground energies and electronic structures using quantum gradient descent.Compared to existing classical-quantum hybrid methods such as variational quantum eigensolver(VQE),our method removes the classical optimizer and performs all the calculations on a quantum computer with faster convergence.The gradient descent iteration depth has a favorable complexity that is logarithmically dependent on the system size and inverse of the precision.Moreover,the FQE can be further simplified by exploiting a perturbation theory for the calculations of intermediate matrix elements and obtaining results with a precision that satisfies the requirement of chemistry application.The full quantum eigensolver can be implemented on a near-term quantum computer.With the rapid development of quantum computing hardware,the FQE provides an efficient and powerful tool to solve quantum chemistry problems. | Shijie Wei Hang Li GuiLu Long | 2020 | Research2020，，1： | 3 |
| 14 | Experimental study of Forrelation in nuclear spins显示文摘Correlation functions are often employed to quantify the relationships among interdependent variables or sets of data.Recently,a new class of correlation functions,called FORRELATION,has been introduced by Aaronson and Ambainis for studying the query complexity of quantum devices.It was found that there exists a quantum query algorithm solving 2-fold FORRELATION problems with an exponential quantum speedup over all possible classical means,which represents essentially the largest possible separation between quantum and classical query complexities.Here we report an experimental study probing the2-fold and 3-fold FORRELATIONS encoded in nuclear spins.The major experimental challenge is to control the spin fluctuation to within a threshold value,which is achieved by developing a set of optimized GRAPE pulse sequences.Overall,our small-scale implementation indicates that the quantum query algorithm is capable of determining the values of FORRELATIONS within an acceptable accuracy required for demonstrating quantum supremacy,given the current technology and in the presence of experimental noise. | Hang Li Xun Gao Tao Xin Man-Hong Yung Guilu Long | 2017 | Science Bulletin2017，62，7： | 3 |
| 15 | Efficient generation of multi-photon W states by joint-measurement显示文摘We propose an effcient scheme to generate multi-photon entangled W state from two-qubit Einstein–Podolsky–Rosen pairs by mea- surements and follow-up local transformation.We discuss the effciency of the scheme under realistic conditions,and its implementation using current technology. | Wenhu Xu Xin Zhao Guilu Long | 2008 | Progress in Natural Science:Materials International2008，18，1： | 2 |
| 16 | Multiparty quantum secret sharing of classical and quantum messages显示文摘为多党的量秘密分享的一个计划古典并且量消息被使用纠纷交换建议。这个计划能散布在 Nagents 之间的不仅古典信息而且量信息。我们的计划的安全也被证实。 | CHEN Pan DENG Fuguo LONG Guilu | 2007 | Progress in Natural Science:Materials International2007，17，1： | 2 |
| 17 | A scheme to implement the Deutsch-Josza algorithm on a superconducting charge-qubit quantum computer显示文摘我们在一台超导的 charge-qubit 量计算机学习了 Deutsch-Josza 量算法的实现。与以前的研究不同,我们使用了 indcutance 你的联合系统等。详细脉搏序列在一个 2-qubit 系统为四个可能的函数被设计了。结果被概括到一个任意的 n-qubit 系统。这个计划将为算法的实际实现是有用的。 | HUO Wenyi LONG Guilu | 2006 | Progress in Natural Science:Materials International2006，16，6： | 2 |
| 18 | Electro-optic modulation using lithium niobate metasurfaces显示文摘Dynamic control of optical fields using metasurfaces has remained a hot pursuit over the past decades. Such control requires the tuning of light-matter interactions in the ultrathin layers of materials. The established approaches to dynamically alter the optical response of metasurfaces include optical pumping, thermal heating, chemical reaction, and electrical stimulation [1]. | GuiLu Long | 2021 | Science China(Physics,Mechanics & Astronomy)2021，64，4： | 1 |
| 19 | Controlled order rearrangement encryption for quantum key distribution显示文摘 | Deng Fuguo Long Guilu | 2003 | Physical Review A2003，68，4： | 1 |
| 20 | Theoretically efficient high-capacity quantum-key-distribution scheme显示文摘 | Long Guilu Liu Xiaoshu | 2002 | Physical Review A2002，65，： | 1 |
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