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Implementation of a continuous-time quantum walk on a sparse graph

Physical Review A 2024年第5期110卷 052215-052215页

作者： Zhaoyang Chen Guanzhong Li Lvzhou Li Institute of Quantum Computing and Software School of Computer Science and Engineering Sun Yat-sen University Guangzhou 510006 China

Continuous-time quantum walks (CTQWs) play a crucial role in quantum computing, especially for designing quantum algorithms. However, how to efficiently implement CTQWs is a challenging issue. In this paper, we study the implementation of CTQWs on sparse graphs, i.e., constructing efficient quantum circuits for implementing the unitary operator e−iHt, where H=γA (γ is a constant and A corresponds to the adjacency matrix of a graph). Our result is, for a d-sparse graph with N vertices and evolution time t, we can approximate e−iHt by a quantum circuit with gate complexity (d3∥H∥tNlog2(N))1+o(1), compared to the general Pauli decomposition, which scales like (∥H∥tN4log2(N))1+o(1). For sparse graphs, for instance, d=O(1), we obtain a noticeable improvement. Interestingly, our technique is related to graph decomposition. More specifically, we decompose the graph into a union of star graphs, and correspondingly, the Hamiltonian H can be represented as the sum of some Hamiltonians Hj, where each e−iHjt is a CTQW on a star graph which can be implemented efficiently.

关键词： quantum algorithms & computation quantum computation quantum walks

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Advancements in quantum image filtering:Exponential speedup on a subset of images

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Science China(Physics,Mechanics & Astronomy) 2024年第9期67卷 13-13页

作者： Lvzhou Li Institute of Quantum Computing and Software School of Computer Science and EngineeringSun Yat-sen UniversityGuangzhou 510006China

The pursuit of quantum supremacy in computational tasks has driven the exploration of quantum algorithms capable of surpassing classical *** the realm of image processing,a notable advancement towards this objective is highlighted in the study by Cui et al.[1].Their work proposes a quantum image filtering(QImF)algorithm that exhibits exponential acceleration for a specific subset of images,offering a glimpse into the potential of quantum computing in image processing.

关键词： quantum subset filtering

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Controllable Majorana vortex states in iron-based superconducting nanowires

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National Science Review 2022年第9期9卷 195-203页

作者： Chuang Li Xun-Jiang Luo Li Chen Dong E.Liu Fu-Chun Zhang Xin Liu School of Physics and Institute for Quantum Science and Engineering Huazhong University of Science and Technology Wuhan National High Magnetic Field Center and Hubei Key Laboratory of Gravitation and Quantum Physics State Key Laboratory of Low Dimensional Quantum Physics Department of Physics Tsinghua University Kavli Institute for Theoretical Sciences and CAS Center for Excellence in Topological Quantum Computing University of Chinese Academy of Sciences Collaborative Innovation Center of Advanced Microstructures Nanjing University

To reve al the non-Abelian braiding statistics of Major ana zero modes(MZMs),it is crucial to design a Majorana platform,in which MZMs can be easily manipulated in a broad topological nontrivial parameter *** is also an essential step to confirm their *** this study,we propose an iron-based superconducting nanowire system with Majorana vortex states to satisfy desirable *** system has a radius-induced topological phase transition,giving a lower bound for the nanowire *** the topological phase,the iron-based superconducting nanowires have only one pair of MZMs over a wide range of radii,chemical potential and external magnetic *** wave function of MZMs has a sizable distribution at the side edge of the *** property enables the control of the interaction of MZMs in neighboring vortex nanowires and paves the way for Majorana fusion and braiding.

关键词： iron-based superconductor topological phase transition superconducting vortex Majorana zero modes nanowire

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Electro-Optic Modulator Stabilizer for Consistent Generation of Short Tunable Optical Pulses

Electro-Optic Modulator Stabilizer for Consistent Generation...

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2023 Photonics North, PN 2023

作者： Li, Michael Anderson, Paul Hawes, Kassandra Al Maruf, Rubayet Bajcsy, Michal University of Waterloo Department of Electrical and Computer Engineering Canada Institute of Quantum Computing University of Waterloo Canada University of Waterloo Department of Physics and Astronomy Canada

ISBN: (纸本)9798350326734

We demonstrate a digital electro-optic modulator (EOM) bias controller designed to maximize the extinction ratio of 100ps optical pulses, which are utilized for exciting single photons from quantum dots. The optical pulses formed by this EOM, continuous-wave tunable diode laser, and electronic pulse generator are an affordable and compact alternative to pulsed Ti: Sapphire Lasers. © 2023 IEEE.

关键词： Semiconductor quantum dots

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Preparing quantum states by measurement-feedback control with Bayesian optimization

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Frontiers of physics 2023年第6期18卷 291-299页

作者： Yadong Wu Juan Yao Pengfei Zhang Department of Physics Fudan UniversityShanghai 200438China State Key Laboratory of Surface Physics Key Laboratory of Micro and Nano Photonic Structures(MOE)Fudan UniversityShanghai 200438China Institute for Nanoelectronic Devices and Quantum Computing Fudan UniversityShanghai 200433China Shanghai Qi Zhi Institute AI TowerXuhui DistrictShanghai 200232China Shenzhen Institute for Quantum Science and Engineering Southern University of Science and TechnologyShenzhen 518055China International Quantum Academy Shenzhen 518048China Guangdong Provincial Key Laboratory of Quantum Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Walter Burke Institute for Theoretical Physics&Institute for Quantum Information and Matter California Institute of TechnologyPasadenaCA 91125USA

The preparation of quantum states is crucial for enabling quantum computations and *** this work,we present a general framework for preparing ground states of many-body systems by combining the measurement-feedback control process(MFCP)with machine learning ***,we employ Bayesian optimization(BO)to enhance the efficiency of determining the measurement and feedback operators within the *** an illustration,we study the ground state preparation of the one-dimensional Bose−Hubbard *** BO,we are able to identify optimal parameters that can effectively drive the system towards low-energy states with a high probability across various quantum *** results open up new directions for further exploration and development of advanced control strategies for quantum computations and simulations.

关键词： state preparation feedback control Bayesian optimization

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Linear and Kerr nonlinear compensators by continuous-variable photonic quantum computing for digital coherent transmission systems

Linear and Kerr nonlinear compensators by continuous-variabl...

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2023 Opto-Electronics and Communications Conference, OECC 2023

作者： Beppu, Shohei Mitarai, Kosuke Mori, Toshio Yoshikane, Noboru Saito, Kazuhiro Photonic Transport Network Laboratory KDDI Research Inc Fujimino Japan Osaka University Graduate School of Engineering Science Toyonaka Japan Osaka University Center for Quantum Information and Quantum Biology Toyonaka Japan Quantum Computing Project KDDI Research Inc Fujimino Japan

We propose linear and Kerr nonlinear compensators by continuous-variable photonic quantum computing for digital coherent transmission systems. The numerical simulation shows the possibility of compensators for chromat... 详细信息

ISBN: (纸本)9781665462136

关键词： Chromatic dispersion

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Adaptive Generation of Flying Logical Qubits

Adaptive Generation of Flying Logical Qubits

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Conference on Lasers and Electro-Optics (CLEO)

作者： Kan Takase Fumiya Hanamura Hironari Nagayoshi Akito Kawasaki Warit Asavanant Mamoru Endo Akira Furusawa Department of Applied Physics School of Engineering The University of Tokyo Tokyo Japan Optical Quantum Computing Research Team RIKEN Center for Quantum Computing Tokyo Japan

We formulate a method to efficiently extract the non-classicality o f photon number measurements into optical traveling wave and show that practical logical qubits can be generated over 10% probability in a realistic ... 详细信息

ISBN: (纸本)9798350369311

关键词： Qubit Measurement by laser beam Optical variables measurement Electro-optical waveguides Photonics

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Implementation of a Mixed Triple Logistic Map and the BB84 quantum Key Distribution for Secure Image Communication

Implementation of a Mixed Triple Logistic Map and the BB84 Q...

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2024 International of Seminar on Application for Technology of Information and Communication, iSemantic 2024

作者： Morissa, Virnika Shefira Gina Setiadi, De Rosal Ignatius Moses Universitas Dian Nuswantoro Informatics Engineering Department Semarang50131 Indonesia Universitas Dian Nuswantoro Research Center for Quantum Computing and Materials Informatics Faculty of Computer Science Semarang50131 Indonesia

ISBN: (纸本)9798350366648

In the digital era, data communication security is one of the main challenges. This research proposes a new method for secure image communication, which is a mixed triple logistic map and BB84 quantum key distribution. This approach combines the strengths of classical and quantum cryptographic systems to improve security. BB84 quantum key distribution protocol for securely distributing encryption keys. The resulting key is then processed into a hash value using the SHA-256 algorithm. These hash values are converted into ASCII values, which are used to generate three key sequences using the modified logistic map. The three key sequences are combined to form a keystream used in image encryption. Several security metrics are used to evaluate encryption security, including entropy, the Chi-Square test, and pixel correlation. The analysis results show that the encrypted image has an entropy close to eight. In addition, all chi-square values smaller than 293 indicate a uniform distribution. The correlation of nearby pixels in the encrypted image is also very low, where all values are less than 0.01, which indicates the loss of local patterns in the encrypted image. These results demonstrate that the proposed method effectively secures image communications, providing high security and resistance to conventional and quantum cryptographic attacks. © 2024 IEEE.

关键词： quantum cryptography

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3D printed push fit board for a two-photon dichroic atomic vapor laser lock 26

3D printed push fit board for a two-photon dichroic atomic v...

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Laser Resonators, Microresonators, and Beam Control XXVI 2024

作者： Li, Michael McDonnell, Katie Anderson, Paul Venuturumilli, Sai Sreesh Videnov, Nikolay Bajcsy, Michal Institute for Quantum Computing University of Waterloo WaterlooON Canada Dept. of Electrical & Computer Engineering University of Waterloo WaterlooON Canada Dept. of Physics & Astronomy University of Waterloo WaterlooON Canada

ISBN: (纸本)9781510670020

Laser locking is a crucial tool in various scientific applications, especially in the field of atomic physics, where the laser's frequency must be stable with respect to the frequencies of atomic transitions. This work aims to leverage the advantages of 3D printed push-fit slots to achieve an inexpensive, compact, and highly customizable optical setup for locking lasers to the frequency of transition between two excited, and thus unpopulated, electron states of a neutral atom. In our approach, the optical components are mounted in custom 3D printed slots instead of traditional optical posts to decrease costs and overall size. The error signal is then created by an electromagnetically induced transparency (EIT) signal in a two-photon dichroic atomic vapor laser lock (T-P DAVLL), corresponding to the 6S1/2, 6P1/2, and 8S1/2 states of Cesium. © 2024 SPIE.

关键词： Atoms

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Cross-resonance control of an oscillator with an auxiliary fluxonium qubit

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Physical Review Applied 2025年第2期23卷 024067-024067页

作者： Guo Zheng Simon Lieu Emma L. Rosenfeld Kyungjoo Noh Connor T. Hann Pritzker School of Molecular Engineering The University of Chicago Chicago 60637 USA AWS Center for Quantum Computing Pasadena California 91125 USA

The conditional displacement (CD) gate between an oscillator and a discrete-variable auxiliary qubit plays a key role in quantum information processing tasks, such as enabling universal control of the oscillator and longitudinal readout of the qubit; however, the gate is unprotected against the propagation of auxiliary qubit decay errors, meaning it is not fault tolerant. Here, we propose a CD gate scheme with fluxonium as the auxiliary qubit, which has been experimentally demonstrated to have a large noise bias and millisecond-level lifetimes. The proposed gate is applied cross-resonantly by modulating the external flux of the fluxonium at the frequency of the target oscillator, which requires minimal hardware overhead and does not increase sensitivity to decoherence mechanisms such as dephasing. We further provide a perturbative description of the gate mechanism and identify the error budget. Additionally, we develop an approximate procedure for choosing device and gate parameters that optimize gate performance. Following the procedure for multiple sets of fluxonium parameters from the literature, we numerically demonstrate CD gates with unitary fidelity exceeding 99.9% and gate times of hundreds of nanoseconds.

关键词： Budget control

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