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Nonreciprocal Bundle Emissions of quantum Entangled Pairs

Physical Review Letters 2024年第4期133卷 043601-043601页

作者： Qian Bin Hui Jing Ying Wu Franco Nori Xin-You Lü School of Physics and Institute for Quantum Science and Engineering College of Physics Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Department of Physics and Synergetic Innovation Center for Quantum Effects and Applications Hunan Normal University Changsha 410081 China Theoretical Quantum Physics Laboratory Cluster for Pioneering Research Center for Quantum Computing Physics Department

Realizing precise control over multiquanta emission is crucial for quantum information processing, especially when integrated with advanced techniques of manipulating quantum states. Here, by spinning the resonator to induce the Sagnac effect, we can obtain nonreciprocal photon-phonon and photon-magnon super-Rabi oscillations under conditions of optically driving resonance transitions. Opening dissipative channels for such super-Rabi oscillations enables the realization of directional bundle emissions of entangled photon-phonon pairs and photon-magnon pairs by transferring the pure multiquanta state to a bundled multiquanta outside of the system. This nonreciprocal emission is a flexible switch that can be controlled with precision, and simultaneous emissions of different entangled pairs (such as photon-phonon or photon-magnon pairs) can even emerge but in opposite directions by driving the resonator from different directions. This ability to flexibly manipulate the system allows us to achieve directional entangled multiquanta emitters, and has also potential applications for building hybrid quantum networks and on-chip quantum communications.

关键词： Cavity quantum electrodynamics Non-reciprocal propagation Photon statistics quantum entanglement

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Boosting the generation rate of squeezed single-photon states by generalized photon subtraction

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Physical Review A 2024年第3期110卷 033717页

作者： Hiroko Tomoda Akihiro Machinaga Kan Takase Jun Harada Takahiro Kashiwazaki Takeshi Umeki Shigehito Miki Fumihiro China Masahiro Yabuno Hirotaka Terai Daichi Okuno Shuntaro Takeda Department of Applied Physics School of Engineering Optical Quantum Computing Research Team NTT Device Technology Labs Advanced ICT Research Institute

In optical quantum information processing with continuous variables, optical non-Gaussian quantum states are essential for universal and fault-tolerant quantum computation. Experimentally, their most typical generation method is photon subtraction (PS), where single-photon detection by an on/off detector probabilistically heralds the generation of squeezed single-photon states. In PS, however, trying to avoid unwanted multiphoton detection inevitably limits the generation rate, hindering the application of squeezed single-photon states. Here, we theoretically show that generalized photon subtraction (GPS), a simple extension of PS, can improve the generation rate while maintaining the quality of the generated states. Furthermore, we experimentally demonstrate the generation rate improvement for 2-dB- and 4-dB-squeezed single-photon states compared to PS, by more than one order of magnitude, particularly for the case of 2 dB. Our results will accelerate the application of squeezed single-photon states to more advanced quantum information protocols.

关键词： quantum information processing quantum optics

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Broadcast Channel Simulation

Broadcast Channel Simulation

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2023 IEEE International Symposium on Information Theory, ISIT 2023

作者： Cao, Michael X. Ramakrishnan, Navneeth Berta, Mario Tomamichel, Marco National University of Singapore Department of Electrical and Computer Engineering Singapore National University of Singapore Centre for Quantum Technologies Singapore Imperial College London Department of Computing London United Kingdom Institute for Quantum Information Rwth Aachen University Aachen Germany

ISBN: (纸本)9781665475549

We study the problem of random-assisted simulation of discrete broadcast channel in one-shot and i.i.d. setups. We derive one-shot inner and outer bounds of the set of attainable message-size pairs for simulating WYZ|X within some total variation distance (TVD) tolerance of ?. The inner bounds are based on the bipartite convex split lemma. Whereas the outer bounds are based on the properties of the multi-partite max information. Using these bounds, we establish a single-letter expression of the simulation region of a broadcast channel. © 2023 IEEE.

关键词： Codes (symbols)

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Hybrid Approach to Mitigate Errors in Linear Photonic Bell-State Measurement for quantum Interconnects

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PRX quantum 2024年第3期5卷 030331-030331页

作者： Beate E. Asenbeck Akito Kawasaki Ambroise Boyer Tom Darras Alban Urvoy Akira Furusawa Julien Laurat Department of Applied Physics School of Engineering Welinq 14 rue Jean Macé Paris 75011 France Optical Quantum Computing Research Team

Optical quantum information processing relies critically on Bell-state measurement, a ubiquitous operation for quantum communication and computing. Its practical realization involves the interference of optical modes and the detection of a single photon in an indistinguishable manner. Yet, in the absence of efficient photon-number-resolution capabilities, errors arise from multiphoton components, decreasing the overall process fidelity. Here, we introduce a hybrid detection scheme for Bell-state measurement, leveraging both on-off single-photon detection and quadrature conditioning via homodyne detection. We derive explicit fidelities for quantum teleportation and entanglement-swapping processes employing this strategy, demonstrating its efficacy. We also compare with photon-number-resolving detectors and find a strong advantage of the hybrid scheme in a wide range of parameters. This work provides a new tool for linear-optics schemes, with applications to quantum state engineering and quantum interconnects.

关键词： Photon pairs & parametric down-conversion quantum communication quantum information processing quantum interconnects quantum measurements quantum networks quantum optics quantum state engineering Single photon sources Optical sources & detectors Photodetectors Homodyne & heterodyne detection Single-photon detectors

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Exciton-Polariton in Single-Walled Carbon Nanotubes with Different Microcavity Structures 16

Exciton-Polariton in Single-Walled Carbon Nanotubes with Dif...

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16th Pacific Rim Conference on Lasers and Electro-Optics, CLEO-PR 2024

作者： Yang, HeeBong Kim, Na Young Institute for Quantum Computing Waterloo Institute for Nanotechnology University of Waterloo Department of Electrical and Computer Engineering 200 University Ave. West WaterlooONN2L 3G1 Canada

Exciton-polariton studies are performed in different microcavity structures with sorted single-walled carbon nanotubes. High vacuum Rabi splitting is observed at room-temperature with metal mirror, and hybrid metal-DB... 详细信息

ISBN: (纸本)9798350372076

关键词： Single-walled carbon nanotubes (SWCN)

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Restoring Adiabatic State Transfer in Time-Modulated Non-Hermitian Systems

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Physical Review Letters 2024年第11期133卷 113802页

作者： Ievgen I. Arkhipov Fabrizio Minganti Adam Miranowicz Şahin K. Özdemir Franco Nori Joint Laboratory of Optics of Palacký University and Institute of Physics of CAS Faculty of Science Institute of Physics Center for Quantum Science and Engineering Theoretical Quantum Physics Laboratory Cluster for Pioneering Research Quantum Information Physics Theory Research Team Quantum Computing Center Institute of Spintronics and Quantum Information Faculty of Physics Department of Engineering Science and Mechanics and Materials Research Institute (MRI) Physics Department

Non-Hermitian systems have attracted much interest in recent decades, driven partly by the existence of exotic spectral singularities, known as exceptional points (EPs), where the dimensionality of the system evolution operator is reduced. Among various intriguing applications, the discovery of EPs has suggested the potential for implementing a symmetric mode switch, when encircling them in a system parameter space. However, subsequent theoretical and experimental works have revealed that dynamical encirclement of EPs invariably results in asymmetric mode conversion; namely, the mode switching depends only on the winding direction but not on the initial state. This chirality arises from the failure of adiabaticity due to the complex spectrum of non-Hermitian systems. Although the chirality revealed has undoubtedly made a significant impact in the field, a realization of the originally sought symmetric adiabatic passage in non-Hermitian systems with EPs has since been elusive. In this work, we bridge this gap and theoretically demonstrate that adiabaticity, and therefore a symmetric state transfer, is achievable when dynamically winding around an EP. This becomes feasible by specifically choosing a trajectory in the system parameter space along which the corresponding evolution operator attains a real spectrum. Our findings, thus, offer a promise for advancing various wave manipulation protocols in both quantum and classical domains.

关键词： quantum state transfer Non-Hermitian systems Adiabatic approximation Dissipative particle dynamics Markovian processes Two-level models

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Measuring Trotter error and its application to precision-guaranteed Hamiltonian simulations

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Physical Review Research 2024年第3期6卷 033285页

作者： Tatsuhiko N. Ikeda Hideki Kono Keisuke Fujii Wako Saitama 351-0198 Japan Department of Physics Department of Applied Physics Graduate School of Engineering Science Center for Quantum Information and Quantum Biology Fujitsu Quantum Computing Joint Research Division at QIQB

Trotterization is the most common and convenient approximation method for Hamiltonian simulations on digital quantum computers, but estimating its error accurately is computationally difficult for large quantum systems. Here, we develop a method for measuring the Trotter error without ancillary qubits on quantum circuits by combining the mth- and nth-order (mquantum circuits shallowest, within the error tolerance. Benchmarking it in a quantum spin chain, we find the adaptively chosen δt to be about 10 times larger than that inferred from known upper bounds of Trotter errors.

关键词： quantum algorithms quantum computation quantum simulation Nonequilibrium lattice models quantum many-body systems

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PancakeFS: A Write Efficiently and Read Optimized Filesystem 4

PancakeFS: A Write Efficiently and Read Optimized Filesystem

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4th International Conference on Consumer Electronics and Computer engineering, ICCECE 2024

作者： Wang, Yongkang Liu, Yang Chen, Zhiguang School of Computer Science and Engineering Sun Yat-sen University Guangzhou China Institute for Quantum Information College of Computer National University of Defense Technology State Key Laboratory of High-Performance Computing Changsha China

ISBN: (纸本)9798350384062

With the development of emerging technologies such as cloud computing and large AI models (such as LLM), many applications have placed higher demands on the intensive read and write processing of massive data. Addressing the limitations of traditional file systems, we propose PancakeFS, an LSM-Tree-based file system. Leveraging the write-friendly characteristics of LSM-Tree, PancakeFS exhibits efficient write performance. We improve read performance through the design of an inode allocation algorithm based on subtree partitioning and optimization of the disk layout for hot data reconstruction. Our experimental results demonstrate that PancakeFS outperforms Ext4 and TableFS in terms of both read and write performance. © 2024 IEEE.

关键词： Data handling

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The Mutual Information In The Vicinity of Capacity-Achieving Input Distributions

The Mutual Information In The Vicinity of Capacity-Achieving...

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2023 IEEE International Symposium on Information Theory, ISIT 2023

作者： Cheng, Hao-Chung Nakiboglu, Baris National Taiwan University Department of Electrical Engineering Graduate Institute of Communication Engineering Department of Mathematics Taipei10617 Taiwan Quantum Computing Centre Taiwan Middle East Technical University Department of Electrical and Electronics Engineering Ankara06800 Turkey

ISBN: (纸本)9781665475549

The mutual information is analyzed as a function of the input distribution using an identity due to Topsoe for channels with (possibly multiple) linear constraints and finite input and output sets. The mutual information is bounded above by a function decreasing quadratically with the distance to the set of all capacity-achieving input distributions for the case when the distance is less than a certain threshold. Explicit expressions for the threshold and the coefficient of the quadratic decrease are derived. A counter-example is provided demonstrating the non-existence of such a quadratic bound in the case of infinitely many linear cost constraints. Implications of these observations for the channel coding problem and applications of the proof technique to related problems are discussed. © 2023 IEEE.

关键词： Information theory

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The reservoir learning power across quantum many-body localization transition

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Frontiers of physics 2022年第3期17卷 91-99页

作者： Wei Xia Jie Zou Xingze Qiu Xiaopeng Li State Key Laboratory of Surface Physics Institute of Nanoelectronics and Quantum Computingand Department of PhysicsFudan UniversityShanghai 200433China Shenzhen Institute for Quantum Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Shanghai Qi Zhi Institute AI TowerXuhui DistrictShanghai 200232China

Harnessing the quantum computation power of the present noisy-intermediate-size-quantum devices has received tremendous interest in the last few years. Here we study the learning power of a one-dimensional long-range randomly-coupled quantum spin chain, within the framework of reservoir computing. In time sequence learning tasks, we find the system in the quantum many-body localized (MBL) phase holds long-term memory, which can be attributed to the emergent local integrals of motion. On the other hand, MBL phase does not provide sufficient nonlinearity in learning highly-nonlinear time sequences, which we show in a parity check task. This is reversed in the quantum ergodic phase, which provides sufficient nonlinearity but compromises memory capacity. In a complex learning task of Mackey–Glass prediction that requires both sufficient memory capacity and nonlinearity, we find optimal learning performance near the MBL-to-ergodic transition. This leads to a guiding principle of quantum reservoir engineering at the edge of quantum ergodicity reaching optimal learning power for generic complex reservoir learning tasks. Our theoretical finding can be tested with near-term NISQ quantum devices.

关键词： quantum reservoir computing many-body localization quantum ergodic edge of quantum ergodicity optimal learning power

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