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arXiv 2022年

作者： Han, Pei-Rong Wu, Fan Huang, Xin-Jie Wu, Huai-Zhi Zou, Chang-Ling Yi, Wei Zhang, Mengzhen Li, Hekang Xu, Kai Zheng, Dongning Fan, Heng Wen, Jianming Yang, Zhen-Biao Zheng, Shi-Biao Fujian Key Laboratory of Quantum Information and Quantum Optics College of Physics and Information Engineering Fuzhou University Fujian Fuzhou350108 China CAS Key Laboratory of Quantum Information University of Science and Technology of China Hefei230026 China CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of China Hefei230026 China Pritzker School of Molecular Engineering University of Chicago ChicagoIL60637 United States Institute of Physics Chinese Academy of Sciences Beijing100190 China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing100190 China Department of Physics Kennesaw State University MariettaGA30060 United States Hefei National Laboratory Hefei230088 China

Non-Hermitian (NH) extension of quantum-mechanical Hamiltonians represents one of the most significant advancements in physics. During the past two decades, numerous captivating NH phenomena have been revealed and demonstrated, but all of which can appear in both quantum and classical systems. This leads to the fundamental question: What NH signature presents a radical departure from classical physics? The solution of this problem is indispensable for exploring genuine NH quantum mechanics, but remains experimentally untouched upon so far. Here we resolve this basic issue by unveiling distinct exceptional entanglement phenomena, exemplified by an entanglement transition, occurring at the exceptional point (EP) of NH interacting quantum systems. We illustrate and demonstrate such purely quantum-mechanical NH effects with a naturally-dissipative light-matter system, engineered in a circuit quantum electrodynamics architecture. Our results lay the foundation for studies of genuinely quantum-mechanical NH physics, signified by EP-enabled entanglement behaviors. Copyright © 2022, The Authors. All rights reserved.

关键词： Quantum entanglement

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Sub-megahertz homogeneous linewidth for Er in Si via in situ single photon detection

arXiv

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arXiv 2021年

作者： Berkman, Ian R. Lyasota, Alexey de Boo, Gabriele G. Bartholomew, John G. Johnson, Brett C. McCallum, Jeffrey C. Xu, Bin-Bin Xie, Shouyi Ahlefeldt, Rose L. Sellars, Matthew J. Yin, Chunming Rogge, Sven Centre of Excellence for Quantum Computation and Communication Technology School of Physics University of New South Wales SydneyNSW2052 Australia Centre for Engineered Quantum Systems School of Physics University of Sydney SydneyNSW2006 Australia University of Sydney Nano Institute University of Sydney SydneyNSW2006 Australia Centre of Excellence for Quantum Computation and Communication Technology School of Physics University of Melbourne VIC3010 Australia Centre of Excellence for Quantum Computation and Communication Technology School of Engineering RMIT University VIC3001 Australia Centre of Excellence for Quantum Computation and Communication Technology Research School of Physics Australian National University CanberraACT0200 Australia Hefei National Laboratory for Physical Sciences at the Microscale CAS Key Laboratory of Microscale Magnetic Resonance and School of Physical Sciences University of Science and Technology of China Hefei230026 China

We studied the optical properties of a resonantly excited trivalent Er ensemble in Si accessed via in situ single photon detection. A novel approach which avoids nanofabrication on the sample is introduced, resulting in a highly efficient detection of 70 excitation frequencies, of which 63 resonances have not been observed in literature. The center frequencies and optical lifetimes of all resonances have been extracted, showing that 5 % of the resonances are within 1 GHz of our electrically detected resonances and that the optical lifetimes range from 0.5 ms up to 1.5 ms. We observed inhomogeneous broadening of less than 400 MHz and an upper bound on the homogeneous linewidth of 1.4 MHz and 0.75 MHz for two separate resonances, which is a reduction of more than an order of magnitude observed to date. These narrow optical transition properties show that Er in Si is an excellent candidate for future quantum information and communication applications. Copyright © 2021, The Authors. All rights reserved.

关键词： Photons

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Robust stimulated Raman shortcut-to-adiabatic passage by invariant-based optimal control

arXiv

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arXiv 2021年

作者： Song, Xue-Ke Meng, Fei Liu, Bao-Jie Wang, Dong Ye, Liu Yung, Man-Hong School of Physics and Material Science Anhui University Hefei230601 China Shenzhen Institute for Quantum Science and Engineering Department of Physics Southern University of Science and Technology Shenzhen518055 China QICI Quantum Information and Computation Initiative Department of Computer Science The University of Hong Kong Pokfulam Road Hong Kong Shenzhen Key Laboratory of Quantum Science and Engineering Southern University of Science and Technology Shenzhen518055 China

The stimulated Raman adiabatic passage (STIRAP) shows an efficient technique that accurately transfers population between two discrete quantum states with the same parity, in three-level quantum systems based on adiabatic evolution. This technique has widely theoretical and experimental applications in many fields of physics, chemistry, and beyond. Here, we present a generally robust approach to speed up STIRAP with invariant-based shortcut to adiabaticity. By controlling the dynamical process, we inversely design a family of Hamiltonians that can realize fast and accurate population transfer from the first to the third level, while the systematic error is largely suppressed in general. Furthermore, a detailed trade-off relation between the population of the intermediate state and the amplitudes of Rabi frequencies in the transfer process is illustrated. These results provide an optimal route toward manipulating the evolution of three-level quantum systems in future quantum information processing. Copyright © 2021, The Authors. All rights reserved.

关键词： Quantum optics

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Negative nonlocal vicinity resistance of viscous flow in a two-dimensional electron system

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Physical Review B 2021年第15期104卷 155308-155308页

作者： Wei-Jie Ji Shu-Yu Zheng Li Lu Kai Chang Chi Zhang State Key Laboratory of Superlattices and Microstructures (SKLSM) Institute of Semiconductors Chinese Academy of Science P.O. Box 912 Beijing 100083 China College of Material Science and Opto-Electronic Technology University of Chinese Academy of Sciences Beijing 100190 China Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing 100190 China

We perform a quantum transport study of Hall viscous liquid in multiterminal narrow Hallbar devices of a high-mobility two-dimensional electron system (2DES) in GaAs/AlGaAs heterostructure. In the nonlocal transport measurements of vicinity geometry under magnetic fields (B), we observe that the absolute negative magnetoresistance (Rxx) value (Rmin<0) and the corresponding magnetic field (Bmin) are both inversely proportional to the adjacent Hallbar arm distance (L). The occurrence of negative resistance is dependent on the characteristic lengths of the devices and the electron flow direction under B-fields. The minimal resistance Rmin occurs when the cyclotron radius RC approximates L. Multiples of high-order (nth-order) Rmin,n's persist from low to high magnetic fields in a large sample size of L=5μm. Our experimental study reveals the transport behaviors in the vicinity regime, where the negative resistances depict viscous electronic flows in the high-mobility 2DES. In addition, the negative and high-order minimal resistances expand to a magnetic field of several kGs.

关键词： Fractional quantum Hall effect Integer quantum Hall effect Magnetoresistance III-V semiconductors Two-dimensional electron gas Two-dimensional electron system Hall bar Resistivity measurements

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Molecular tetraquarks and pentaquarks in chiral effective field theory

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Nuclear and Particle physics Proceedings 2023年 324-329卷 45-48页

作者： Wang, Bo Meng, Lu Zhu, Shi-Lin School of Physical Science and Technology Hebei University Baoding 071002 China Key Laboratory of High-precision Computation and Application of Quantum Field Theory of Hebei Province Baoding 071002 China Ruhr-Universität Bochum Fakultät für Physik und Astronomie Institut für Theoretische Physik II Bochum D-44780 Germany School of Physics Center of High Energy Physics Peking University Beijing 100871 China

We studied the DD¯⁎/D¯D⁎, D⁎D¯⁎, D¯sD⁎/D¯s⁎D, BB¯⁎/B¯B⁎ and B⁎B¯⁎ di-hadron interactions in chiral effective field theory (χEFT) up to the next-to-leading (NLO) order. The abov... 详细信息

We studied the DD¯^⁎/D¯D^⁎, D^⁎D¯^⁎, D¯_sD^⁎/D¯_s^⁎D, BB¯^⁎/B¯B^⁎ and B^⁎B¯^⁎ di-hadron interactions in chiral effective field theory (χEFT) up to the next-to-leading (NLO) order. The above-threshold tetraquark states Z_c(3900), Z_c(4020), Z_cs(3985), Z_b(10610), Z_b(10650) can be explained as the corresponding di-hadron resonances, respectively. We also studied the Σ_c^(⁎)D¯^(⁎) interactions to investigate the three hidden-charm pentaquarks P_c(4312), P_c(4440) and P_c(4457). We further used the parameters fixed from the P_c states to predict the possible molecular states in Ξ_cD¯^(⁎), Ξ_c^′D¯^(⁎) and Ξ_c^⁎D¯^(⁎) systems. Our predictions of the Ξ_cD¯^(⁎) bound states are very consistent with two new near-threshold structures recently observed by the LHCb Collaboration. © 2023 Elsevier B.V.

关键词： Bound states and resonances Chiral EFT Hadronic molecules Heavy quark symmetry

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Optically Detected Magnetic Resonance of Nitrogen-Vacancy Centers in Diamond under Weak Laser Excitation

arXiv

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arXiv 2023年

作者： Yu, Yong-Hong Zhang, Rui-Zhi Xu, Yue Chen, Xiu-Qi Zheng, Huijie Li, Quan Liu, Ren-Bao Pan, Xin-Yu Budker, Dmitry Liu, Gang-Qin Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing100190 China School of Physical Sciences University of Chinese Academy of Sciences Beijing100049 China Songshan Lake Materials Laboratory Guangdong Dongguan523808 China Department of Physics Centre for Quantum Coherence The Hong Kong Institute of Quantum Information Science and Technology The Chinese University of Hong Kong New Territories Hong Kong CAS Center of Excellence in Topological Quantum Computation Beijing100190 China Johannes Gutenberg-Universität Mainz Mainz55128 Germany Helmholtz-Institut GSI Helmholtzzentrum für Schwerionenforschung Mainz55128 Germany Department of Physics University of California BerkeleyCA94720 United States

As promising quantum sensors, nitrogen-vacancy (NV) centers in diamond have been widely used in frontier studies in condensed matter physics, material science, and life sciences. In practical applications, weak laser excitation is favorable as it reduces the side effects of laser irradiation, such as phototoxicity and heating. Here we report a combined theoretical and experimental study of (near) zero-field optically detected magnetic resonance (ODMR) of NV-center ensembles under weak 532-nm laser excitation. In this region, both the width and splitting of the ODMR spectra decrease with increasing laser power. This power dependence is reproduced with a model that accounts for the laser-induced charge neutralization of NV−- N+ pairs, which alters the local electric field environment. These results are important for the understanding and development of NV-based quantum sensing in light-sensitive applications. © 2023, CC BY-NC-ND.

关键词： Laser excitation

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Certifying the quantumness of a nuclear spin qudit through its uniform precession

arXiv

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arXiv 2024年

作者： Vaartjes, Arjen Nurizzo, Martin Zaw, Lin Htoo Wilhelm, Benjamin Yu, Xi Holmes, Danielle Schwienbacher, Daniel Kringhøj, Anders van Blankenstein, Mark R. Jakob, Alexander M. Hudson, Fay E. Itoh, Kohei M. Murray, Riley J. Blume-Kohout, Robin Anand, Namit Dzurak, Andrew S. Jamieson, David N. Scarani, Valerio Morello, Andrea School of Electrical Engineering and Telecommunications UNSW Sydney SydneyNSW2052 Australia ARC Centre of Excellence for Quantum Computation and Communication Technology Australia Centre for Quantum Technologies National University of Singapore 3 Science Drive 2 Singapore117543 Singapore School of Physics University of Melbourne MelbourneVIC3010 Australia Diraq Pty. Ltd. SydneyNSW Australia School of Fundamental Science and Technology Keio University Kohoku-ku Yokohama Japan Quantum Performance Laboratory Sandia National Laboratories LivermoreCA94550 United States Quantum Performance Laboratory Sandia National Laboratories AlbuquerqueNM87185 United States NASA Ames Research Center Moffett FieldCA94035 United States KBR Inc. 601 Jefferson St. HoustonTX77002 United States Department of Physics National University of Singapore 2 Science Drive 3 Singapore117542 Singapore

Spin precession is a textbook example of dynamics of a quantum system that exactly mimics its classical counterpart. Here we challenge this view by certifying the quantumness of exotic states of a nuclear spin through its uniform precession. The key to this result is measuring the positivity, instead of the expectation value, of the x-projection of the precessing spin, and using a spin > 1/2 qudit, that is not restricted to semi-classical spin coherent states. The experiment is performed on a single spin-7/2 123Sb nucleus, implanted in a silicon nanoelectronic device, amenable to high-fidelity preparation, control, and projective single-shot readout. Using Schrödinger cat states and other bespoke states of the nucleus, we violate the classical bound by 19 standard deviations, proving that no classical probability distribution can explain the statistic of this spin precession, and highlighting our ability to prepare quantum resource states with high fidelity in a single atomic-scale qudit. © 2024, CC BY-NC-ND.

关键词： Spin dynamics

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Ultracold field-linked tetratomic molecules

arXiv

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arXiv 2023年

作者： Chen, Xing-Yan Biswas, Shrestha Eppelt, Sebastian Schindewolf, Andreas Deng, Fulin Shi, Tao Yi, Su Hilker, Timon A. Bloch, Immanuel Luo, Xin-Yu Max-Planck-Institut für Quantenoptik Garching85748 Germany Munich Center for Quantum Science and Technology München80799 Germany School of Physics and Technology Wuhan University Hubei Wuhan430072 China CAS Key Laboratory of Theoretical Physics Institute of Theoretical Physics Chinese Academy of Sciences Beijing100190 China CAS Center for Excellence in Topological Quantum Computation School of Physical Sciences University of Chinese Academy of Sciences Beijing100049 China Peng Huanwu Collaborative Center for Research and Education Beihang University Beijing100191 China Fakultät für Physik Ludwig-Maximilians-Universität München80799 Germany

Ultracold polyatomic molecules offer intriguing new opportunities [1] in cold chemistry [2, 3], precision measurements [4], and quantum information processing [5, 6], thanks to their rich internal structure. However, their increased complexity compared to diatomic molecules presents a formidable challenge to employ conventional cooling techniques. Here, we demonstrate a new approach to create ultracold polyatomic molecules by electroassociation [7, 8] in a degenerate Fermi gas of microwave-dressed polar molecules through a field-linked resonance [9–11]. Starting from ground state NaK molecules, we create around 1.1 × 103 tetratomic (NaK)2 molecules, with a phase space density of 0.040(3) at a temperature of 134(3) nK, more than 3,000 times colder than previously realized tetratomic molecules [12]. We observe a maximum tetramer lifetime of 8(2) ms in free space without a notable change in the presence of an optical dipole trap, indicating these tetramers are collisionally stable. The measured binding energy and lifetime agree well with parameter-free calculations, which outlines pathways to further increase the lifetime of the tetramers. Moreover, we directly image the dissociated tetramers through microwave-field modulation to probe the anisotropy of their wave function in momentum space. Our result demonstrates a universal tool for assembling ultracold polyatomic molecules from smaller polar molecules, which is a crucial step towards Bose–Einstein condensation (BEC) of polyatomic molecules and towards a new crossover from a dipolar Bardeen–Cooper–Schrieffer (BCS) superfluid [13–15] to a BEC of tetramers. Additionally, the long-lived FL state provides an ideal starting point for deterministic optical transfer to deeply bound tetramer states [16–18]. © 2023, CC BY-NC-SA.

关键词： Molecules

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Charge Transport in a Multiterminal DNA Tetrahedron: Interplay among Contact Position, Disorder, and Base-Pair Mismatch

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Physical Review Applied 2022年第2期17卷 024074-024074页

作者： Pei-Jia Hu Si-Xian Wang Xiao-Feng Chen Xiao-Hui Gao Tie-Feng Fang Ai-Min Guo Qing-Feng Sun Hunan Key Laboratory for Super-microstructure and Ultrafast Process School of Physics and Electronics Central South University Changsha 410083 China School of Physical Science and Technology Lanzhou University Lanzhou 730000 China School of Sciences Nantong University Nantong 226019 China International Center for Quantum Materials School of Physics Peking University Beijing 100871 China Collaborative Innovation Center of Quantum Matter Beijing 100871 China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing 100190 China

As a secondary structure of DNA, DNA tetrahedra exhibit intriguing charge-transport phenomena and provide a promising platform for wide applications like biosensors, as shown in recent electrochemical experiments. Here, we study charge transport in a multiterminal DNA tetrahedron, finding that its charge-transport properties strongly depend upon the interplay of contact position, on-site energy disorder, and base-pair mismatch. Our results indicate that this multiterminal DNA tetrahedron behaves as a nanoscale charge splitter when the source is contacted at the top vertex. Besides, we find that the charge-transport efficiency is nearly independent of the contact position in the weak disorder regime, and is dramatically declined by the occurrence of a single base-pair mismatch between the source and the drain, in accordance with experimental results [J. Am. Chem. Soc. 134, 13148 (2012); Chem. Sci. 9, 979 (2018)]. By contrast, the charge-transport efficiency will be enhanced monotonically by shifting the source toward the drain in the strong disorder regime, and be increased when the base-pair mismatch takes place exactly at the contact position. In particular, when the source moves successively from the top vertex to the drain, the charge transport through the tetrahedral DNA device can be separated into three regimes, ranging from disorder-induced linear decrement of conductance to disorder-insensitive charge transport, and to disorder-enhanced charge transport. Finally, we predict that the DNA tetrahedron functions as a more efficient spin filter compared to double-stranded DNA and as a nanoscale spin splitter with opposite spin polarization observed at different drains. These results could be readily checked by electrochemical measurements and help for designing intriguing DNA tetrahedron-based molecular nanodevices.

关键词： Organic electronics Quantum transport Spin polarization DNA Devices Nanostructures Nonequilibrium Green's function

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Quantum Uncertainty Principles for Measurements with Interventions

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Physical Review Letters 2023年第24期130卷 240201-240201页

作者： Yunlong Xiao Yuxiang Yang Ximing Wang Qing Liu Mile Gu Institute of High Performance Computing (IHPC) Agency for Science Technology and Research (A*STAR) 1 Fusionopolis Way No. 16-16 Connexis Singapore 138632 Republic of Singapore Nanyang Quantum Hub School of Physical and Mathematical Sciences Nanyang Technological University Singapore 637371 Singapore QICI Quantum Information and Computation Initiative Department of Computer Science The University of Hong Kong Pokfulam Road Hong Kong Institute for Theoretical Physics ETH Zürich 8093 Zürich Switzerland Key Laboratory for Information Science of Electromagnetic Waves (Ministry of Education) Fudan University Shanghai 200433 China Centre for Quantum Technologies National University of Singapore Singapore 117543 Singapore MajuLab CNRS-UNS-NUS-NTU International Joint Research Unit UMI 3654 Singapore 117543 Singapore

Heisenberg’s uncertainty principle implies fundamental constraints on what properties of a quantum system we can simultaneously learn. However, it typically assumes that we probe these properties via measurements at a single point in time. In contrast, inferring causal dependencies in complex processes often requires interactive experimentation—multiple rounds of interventions where we adaptively probe the process with different inputs to observe how they affect outputs. Here, we demonstrate universal uncertainty principles for general interactive measurements involving arbitrary rounds of interventions. As a case study, we show that they imply an uncertainty trade-off between measurements compatible with different causal dependencies.

关键词： Quantum foundations Quantum information theory Quantum measurements Quantum memories Quantum networks

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