Luming Duan

Tsinghua University

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Yukai Wu

Tsinghua University

C. Monroe

Duke University

Yipu Song

Tsinghua University

Dong-Ling Deng

ShangHai JiAi Genetics & IVF Institute

Yunfei Pu

Hefei University

Z.-C. Zhou

Tsinghua University

Sheng-Tao Wang

Chengdu Medical College

Q.-X. Mei

Tsinghua University

Pan‐Yu Hou

Tsinghua University

Yong Xu

Tsinghua University

Cooperative Institutions

Chinese Academy of Sciences

215

Tsinghua University

205

Institute of Modern Physics

129

University of Chinese Academy of Sciences

110

Peking University

104

Joint Institute for Nuclear Research

University of Science and Technology of China

European Organization for Nuclear Research

Institute of High Energy Physics

Istituto Nazionale di Fisica Nucleare

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Long-Distance Entanglement between a Multiplexed Quantum Memory and a Telecom Photon

Physical Review X (2019)

Wei Chang Chang Li Yukai Wu Nan Jiang S. Zhang

Realization of long-distance quantum communication through the quantum repeater network requires a combination of some key elements, including a multiplexed quantum memory for storage of entanglement and a telecom photon for propagation of information through the fiber. Although impressive experimental advances have demonstrated the individual elements, combining these key capabilities together and realizing them in a single experimental system remains a significant challenge. Here, we report an experimental realization of long-distance entanglement between a multiplexed quantum memory with 49 individually accessible memory cells and a telecom photon after transmission in a 10-km optical fiber. Excitation of an atomic ensemble generates narrow-band polarization entanglement between a telecom photon of 1530-nm wavelength and another photon of 780-nm wavelength, which is then stored into a memory cell of a multiplexed atomic quantum memory and read out after a controllable delay. The entanglement is verified through quantum-state tomography after quantum storage in the atomic memory and fiber transmission of the telecom photon. This experiment demonstrates an important step towards realization of long-distance quantum communication networks.Received 21 June 2019Revised 16 October 2019DOI:https://doi.org/10.1103/PhysRevX.9.041033Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasQuantum memoriesQuantum networksQuantum repeatersQuantum Information

Photon entanglement

Quantum key distribution

Quantum sensor

10.1103/physrevx.9.041033

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Citations (29)

Trapped Ion Quantum Computation with Transverse Phonon Modes

Physical Review Letters (2006)

Shi-Liang Zhu C. Monroe Luming Duan

We propose a scheme to implement quantum gates on any pair of trapped ions immersed in a large linear crystal, using interaction mediated by the transverse phonon modes. Compared with the conventional approaches based on the longitudinal phonon modes, this scheme is much less sensitive to ion heating and thermal motion outside of the Lamb-Dicke limit thanks to the stronger confinement in the transverse direction. The cost for such a gain is only a moderate increase of the laser power to achieve the same gate speed. We also show how to realize arbitrary-speed quantum gates with transverse phonon modes based on simple shaping of the laser pulses.

10.1103/physrevlett.97.050505

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Citations (192)

Entangling nuclear spins by dissipation in a solid-state system

Physical review. A/Physical review, A (2020)

Xin Wang Huili Zhang Wengang Zhang Xiao-Long Ouyang Xianzhi Huang

Entanglement is a fascinating feature of quantum mechanics and a key ingredient in most quantum information processing tasks. Yet the generation of entanglement is usually hampered by undesired dissipation owing to the inevitable coupling of a system with its environment. Here, we report an experiment on how to entangle two $^{13}\mathrm{C}$ nuclear spins via engineered dissipation in a nitrogen-vacancy system. We utilize the electron spin as an ancilla and combine unitary processes together with optical pumping of the ancilla to implement the engineered dissipation and deterministically produce an entangled state of the two nuclear spins, independent of their initial states. Our experiment demonstrates the power of engineered dissipation as a tool for generation of multiqubit entanglement in solid-state systems.

10.1103/physreva.102.032615

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Citations (2)

Ultrafast Coherent Excitation of a Trapped Ion Qubit for Fast Gates and Photon Frequency Qubits

Physical Review Letters (2006)

M. J. Madsen D. L. Moehring Peter Maunz R. N. Kohn Luming Duan

We demonstrate ultrafast coherent excitation of an atomic qubit stored in the hyperfine levels of a single trapped cadmium ion. Such ultrafast excitation is crucial for entangling networks of remotely located trapped ions through the interference of photon frequency qubits, and is also a key component for realizing ultrafast quantum gates between Coulomb-coupled ions.

10.1103/physrevlett.97.040505

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Experimental realization of quantum teleportation from a photon to the vibration modes of a millimeter-sized diamond

Bulletin of the American Physical Society (2016)

Yuanyuan Huang Pan‐Yu Hou Xinxing Yuan Xiuying Chang Chong Zu

Realization (probability)

Quantum teleportation

Teleportation

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Observation of quantum superposition of topological defects in a trapped-ion quantum simulator

Science Advances (2024)

Zhi-Wen Cheng Yukai Wu S. Li Q.-X. Mei B.-W. Li

Topological defects are discontinuities of a system protected by global properties, with wide applications in mathematics and physics. While previous experimental studies mostly focused on their classical properties, it has been predicted that topological defects can exhibit quantum superposition. Despite the fundamental interest and potential applications in understanding symmetry-breaking dynamics of quantum phase transitions, its experimental realization still remains a challenge. Here, we report the observation of quantum superposition of topological defects in a trapped-ion quantum simulator. By engineering long-range spin-spin interactions, we observe a spin kink splitting into a superposition of kinks at different positions, creating a “Schrodinger kink” that manifests nonlocality and quantum interference. Furthermore, by preparing superposition states of neighboring kinks with different phases, we observe the propagation of the wave packet in different directions, thus unambiguously verifying the quantum coherence in the superposition states. Our work provides useful tools for nonequilibrium dynamics in quantum Kibble-Zurek physics.

Quantum superposition

Topological degeneracy

Quantum phases

10.1126/sciadv.adr9527

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Citations (0)

Quantum computing and quantum communication with atoms

Luming Duan Wolfgang Dür J. I. Cirac Dieter Jaksch Guifré Vidal

10.1142/9789812705099_0028

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Creating Schrödinger-cat states

Nature Photonics (2019)

Luming Duan

Quantum superposition

Schrödinger's cat

10.1038/s41566-018-0340-z

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Citations (25)

Scalable Implementation of Boson Sampling with Trapped Ions

Chao Shen Zhen Zhang Luming Duan

Boson sampling solves a classically intractable problem by sampling from a probability distribution given by matrix permanents. We propose a scalable implementation of boson sampling using local transverse phonon modes of trapped ions to encode the bosons. The proposed scheme allows deterministic preparation and high-efficiency readout of the bosons in the Fock states and universal mode mixing. With the state-of-the-art trapped ion technology, it is feasible to realize boson sampling with tens of bosons by this scheme, which would outperform the most powerful classical computers and constitute an effective disproof of the famous extended Church-Turing thesis.

Matrix (chemical analysis)

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Unconventional quantum Hall effects in two-dimensional massive spin-1 fermion systems

Physical review. B./Physical review. B (2017)

Yong Xu Luming Duan

Unconventional fermions with high degeneracies in three dimensions beyond Weyl and Dirac fermions have sparked tremendous interest in condensed matter physics. Here, we study quantum Hall effects (QHEs) in a two-dimensional (2D) unconventional fermion system with a pair of gapped spin-1 fermions. We find that the original unlimited number of zero energy Landau levels (LLs) in the gapless case develop into a series of bands, leading to a novel QHE phenomenon that the Hall conductance first decreases (or increases) to zero and then revives as an infinite ladder of fine staircase when the Fermi surface is moved toward zero energy, and it suddenly reverses with its sign being flipped due to a Van Hove singularity when the Fermi surface is moved across zero. We further investigate the peculiar QHEs in a dice model with a pair of spin-1 fermions, which agree well with the results of the continuous model.

Van Hove singularity

Landau quantization

Composite fermion

Fermi energy

10.1103/physrevb.96.155301

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Citations (51)