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218 results on '"Wu, Zhenlin"'

1. Strategies for implementing quantum error correction in molecular rotation

Author

Furey, Brandon J., Wu, Zhenlin, Isaza-Monsalve, Mariano, Walser, Stefan, Mattivi, Elyas, Nardi, René, and Schindler, Philipp

Subjects
Quantum Physics
Abstract

The rotation of trapped molecules offers a promising platform for quantum technologies and quantum information processing. In parallel, quantum error correction codes that can protect quantum information encoded in rotational states of a single molecule have been developed. These codes are currently an abstract concept, as no implementation strategy is yet known. Here, we present a step towards experimental implementation of these codes by introducing architecture-agnostic check and correction operators. These operators can be decomposed into elements of the quantum logic spectroscopy toolbox that is available for molecular ions. We then describe and analyze a measurement-based sequential as well as an autonomous implementation strategy in the presence of thermal background radiation, a major noise source for rotation in polar molecules. The presented strategies and methods might enable robust sensing or even fault-tolerant quantum computing using the rotation of individual molecules.

Published
2024

2. Photodissociation spectra of single trapped CaOH+ molecular ions

Author

Wu, Zhenlin, Walser, Stefan, Podlesnic, Verena, Isaza-Monsalve, Mariano, Mattivi, Elyas, Mu, Guanqun, Nardi, René, Gniewek, Piotr, Tomza, Michał, Furey, Brandon J., and Schindler, Philipp

Subjects
Physics - Atomic Physics, Physics - Chemical Physics, Quantum Physics
Abstract

Molecular ions that are generated by chemical reactions with trapped atomic ions can serve as an accessible testbed for developing molecular quantum technologies. On the other hand, they are also a hindrance to scaling up quantum computers based on atomic ions as unavoidable reactions with background gas destroy the information carriers. Here, we investigate the single- and two-photon dissociation processes of single $\text{CaOH}^+$ molecular ions co-trapped in $\text{Ca}^+$ ion crystals using a femtosecond laser system. We report the photodissociation cross section spectra of $\text{CaOH}^+$ for single-photon processes at $\lambda=$245 - 275$\,$nm and for two-photon processes at $\lambda=$500 - 540$\,$nm. Measurements are interpreted with quantum-chemical calculations, which predict the photodissociation threshold for $\text{CaOH}^+\to \text{Ca}^++\text{OH}$ at 265$\,$nm. This result can serve as a basis for dissociation-based spectroscopy for studying the internal structure of $\text{CaOH}^+$. The result also gives a prescription for recycling $\text{Ca}^+$ ions in large-scale trapped $\text{Ca}^+$ quantum experiments from undesired $\text{CaOH}^+$ ions formed in the presence of background water vapor., Comment: 13 pages, 18 figures

Published
2024
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5. Photodissociation spectra of single trapped CaOH+ molecular ions.

Author

Wu, Zhenlin, Walser, Stefan, Podlesnic, Verena, Isaza-Monsalve, Mariano, Mattivi, Elyas, Mu, Guanqun, Nardi, René, Gniewek, Piotr, Tomza, Michał, Furey, Brandon J., and Schindler, Philipp

Abstract

Molecular ions that are generated by chemical reactions with trapped atomic ions can serve as an accessible testbed for developing molecular quantum technologies. On the other hand, they are also a hindrance to scaling up quantum computers based on atomic ions, as unavoidable reactions with background gases destroy the information carriers. Here, we investigate the single- and two-photon dissociation processes of single CaOH+ molecular ions co-trapped in Ca+ ion crystals using a femtosecond laser system. We report the photodissociation cross section spectra of CaOH+ for single-photon processes at λ = 245–275 nm and for two-photon processes at λ = 500–540 nm. Measurements are interpreted with quantum-chemical calculations, which predict the photodissociation threshold for CaOH+ → Ca+ + OH at 265 nm. This result can serve as a basis for dissociation-based spectroscopy for studying the internal structure of CaOH+. The result also gives a prescription for recycling Ca+ ions in large-scale trapped Ca+ quantum experiments from undesired CaOH+ ions formed in the presence of background water vapor. [ABSTRACT FROM AUTHOR]

Published
2024
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8. Engineering spin-spin interactions with optical tweezers in trapped ions

Author

Espinoza, Juan Diego Arias, Mazzanti, Matteo, Fouka, Katya, Schüssler, Rima X., Wu, Zhenlin, Corboz, Philippe, Gerritsma, Rene, and Safavi-Naini, Arghavan

Subjects
Quantum Physics, Condensed Matter - Strongly Correlated Electrons, Physics - Atomic Physics
Abstract

We propose a new method for generating programmable interactions in one- and two-dimensional trapped-ion quantum simulators. Here we consider the use of optical tweezers to engineer the sound-wave spectrum of trapped ion crystals. We show that this approach allows us to tune the interactions and connectivity of the ion qubits beyond the power-law interactions accessible in current setups. We demonstrate the experimental feasibility of our proposal using realistic tweezer settings and experimentally relevant trap parameters to generate the optimal tweezer patterns to create target spin-spin interaction patterns in both one- and two-dimensional crystals. Our approach will advance quantum simulation in trapped-ion platforms as it allows them to realize a broader family of quantum spin Hamiltonians.

Published
2021
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11. Controlling Ferromagnetic Ground States and Solitons in Thin Films and Nanowires built from Iron Phthalocyanine Chains

Author

Wu, Zhenlin, Robaschik, Peter, Fleet, Luke R., Felton, Solveig, Aeppli, Gabriel, and Heutz, Sandrine

Subjects
Condensed Matter - Strongly Correlated Electrons, Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Materials Science, Physics - Applied Physics
Abstract

Iron phthalocyanine (FePc) is a molecular semiconductor whose building blocks are one-dimensional ferromagnetic chains. We show that its optical and magnetic properties are controlled by the growth strategy, obtaining extremely high coercivities of over 1 T and modulating the exchange constant between 15 and 29 K through tuning the crystal phase by switching from organic molecular beam deposition, producing continuous thin films of nanocrystals with controlled orientations, to organic vapour phase deposition, producing ultralong nanowires. Magnetisation measurements are analysed using a suite of concepts and simply stated formulas with broad applicability to all one-dimensional ferromagnetic chains. They show that FePc is best described by a Heisenberg model with a preference for the moments to lie in the molecular planes, where the chain Hamiltonian is very similar to that for the classic inorganic magnet CsNiF3, but with ferromagnetic rather than antiferromagnetic interchain interactions. The data at large magnetic fields are well-described by the soliton picture, where the dominant (and topologically non-trivial) degrees of freedom are moving one-dimensional magnetic domain walls, which was successful for CsNiF3, and at low temperatures and fields by the super-Curie-Weiss law of 1/(T^2+theta^2) characteristic of nearly one-dimensional xy and Heisenberg ferromagnets. The ability to control the molecular orientation and ferromagnetism of FePc systems, and produce them on flexible substrates as thin films or nanowires, taken together with excellent transistor characteristics reported previously for nanowires of copper and cobalt analogues, makes them potentially useful for magneto-optical and spintronic devices.

Published
2019
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21. Magnetic properties of transition metal phthalocyanine molecular thin films and nanostructures

Author

Wu, Zhenlin and Heutz, Sandrine

Subjects
530.412
Abstract

The unique magnetic properties of transition metal phthalocyanines (MPc) have attracted considerable scientific interest for decades. So far, most of the research was focused on single crystals. In this thesis, MPc materials were grown in thin film form using vacuum-based methods, such as organic vapour phase deposition (OVPD) and organic molecular beam deposition (OMBD). These methods were used to produce a range of molecular film structures and morphologies of MPcs with different spin states. We find that the magnetic properties are superior to single crystals, in terms of Curie-Weiss constant and coercive fields. Understanding the film properties will be essential for future device applications. Firstly, OVPD was used to prepare MnPc thin films that crystallise as the β-polymorph. Superconducting quantum interference device (SQUID) results show that the films behave as canted ferromagnets with a Curie constant of 10.6 K and a coercive field of 9 mT at 2 K. The texture of the MnPc film can be tuned by introducing a molecular layer on to the substrate. Unexpectedly, we find a change of polymorph from β-phase to ε-phase, which was verified by X-ray diffraction (XRD). A strong axial anisotropy of the films was observed from the magnetic measurements. Secondly, α-polymorph FePc films were grown by OMBD with different textures, depending on whether a templating layer was used. Magnetic measurements show that both films behave as canted ferromagnets with strong in-plane anisotropy and have a similar ferromagnetic exchange coupling of 20 K. The coercive fields at 2 K of non-templated and templated film are 85 mT and 35 mT, respectively. Finally, in order to reduce dimensionality and explore a new crystal phase, FePc wires with around 100 nm in width and a few microns in length were prepared by OVPD. XRD indicates that FePc nanowires adopt the η-phase polymorph, identical to what was observed in CuPc nanowires. Both the Curie constant and coercive field are higher than the film form, reaching 40 K and 1 T, respectively.

Published
2012
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31. Open Source Board Based Acoustofluidic Transwells for Reversible Disruption of the Blood-Brain Barrier for Therapeutic Delivery

Author

Wang, Ke, primary, Sun, Chao, additional, Duciums, Povilas, additional, Zhang, Hongxiong, additional, Wu, Zhenlin, additional, Tian, Liangfei, additional, Peng, Wang, additional, Fu, Yongqing, additional, Wei, Jun, additional, Cai, Meng, additional, Zhong, Yi, additional, Li, Xiaoyu, additional, Yang, Xin, additional, and Cui, Min, additional

Published
2022
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32. Additional file 1 of Open source board based acoustofluidic transwells for reversible disruption of the blood–brain barrier for therapeutic delivery

Author

Wang, Ke, Sun, Chao, Dumčius, Povilas, Zhang, Hongxin, Liao, Hanlin, Wu, Zhenlin, Tian, Liangfei, Peng, Wang, Fu, Yongqing, Wei, Jun, Cai, Meng, Zhong, Yi, Li, Xiaoyu, Yang, Xin, and Cui, Min

Abstract

Additional file 1: Supplementary Fig. 1. Apoptosis analysis after SAW treatment. hBMECs were seeded in round slides for 48 h when firm barrier formed, then the slides were exposed on a SAW. The apoptosis of hBMECs was measured with Annexin V-AbFluor-647 Apoptosis Detection kit. Data are representative results of two individual experiments. Supplementary Table 1. The statistical analysis of Supplementary Fig. 1. Supplementary Fig. 2. Three-dimensionalimage of tight junction proteins. hBMECs were seeded in round slides for 48 h when firm barrier formed, then the slides were exposed on a SAW, which was same with Fig. 6. The z axis was selected for 10 μm, and 11 continuous pictures were acquired. The 3-D distribution of cell tight junction proteins was reconstituted and shown. Supplementary Fig. 3. A schematic diagram of brain region in 10-day-old zebrafish. The main brain regions include telencephalon, optic tectum, cerebellum and brainstem. The dotted lines only indicate the relative position of each brain region, and the area does not represent the full size of each region. Scale bar was 200 μm.

Published
2023
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36. Trapped ions in optical tweezers

Author

Mazzanti, Matteo, primary, Schüssler, Rima, primary, Robalo Pereira, Clara, primary, Egbert Dirk Ackerman, Zeger, primary, Wu, Zhenlin, primary, Arias Espinoza, Juan, primary, Feldker, Thomas, primary, Safavi-Naini, Arghavan, primary, and Gerritsma, Rene, primary

Published
2022
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38. An Enhanced Tilted-Angle Acoustic Tweezer for Mechanical Phenotyping of Cancer Cells

Author

Wang, Hanlin, primary, Boardman, Joe, additional, Zhang, Xiaoyan, additional, Sun, Chao, additional, Cai, Meng, additional, Wei, Jun, additional, Dong, Zhiqiang, additional, Feng, Mingqian, additional, Liang, Dongfang, additional, Hu, Shen, additional, Qian, Yu, additional, Dong, Shuang, additional, Fu, Yongqing, additional, Torun, Hamdi, additional, Clayton, Aled, additional, Wu, Zhenlin, additional, Xie, Zhihua, additional, and Yang, Xin, additional

Published
2022
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40. Potential for spin-based information processing in a thin-film molecular semiconductor

Author

Warner, Marc, Din, Salahud, Tupitsyn, Igor S., Morley, Gavin W., Stoneham, A. Marshall, Gardener, Jules A., Wu, Zhenlin, Fisher, Andrew J., Heutz, Sandrine, Kay, Christopher W.M., and Aeppli, Gabriel

Subjects
Semiconductors -- Design and construction, Spintronics -- Research, Environmental issues, Science and technology, Zoology and wildlife conservation
Abstract

Organic semiconductors are studied intensively for applications in electronics and optics (1), and even spin-based information technology, or spintronics (2). Fundamental quantities in spintronics are the population relaxation time ([T.sub.1]) [...]

Published
2013

41. A reconfigurable and portable acoustofluidic system based on flexible printed circuit board for the manipulation of microspheres

Author

Mikhaylov, Roman, primary, Martin, Mercedes Stringer, additional, Dumcius, Povilas, additional, Wang, Hanlin, additional, Wu, Fangda, additional, Zhang, Xiaoyan, additional, Akhimien, Victory, additional, Sun, Chao, additional, Clayton, Aled, additional, Fu, Yongqing, additional, Ye, Lin, additional, Dong, Zhiqiang, additional, Wu, Zhenlin, additional, and Yang, Xin, additional

Published
2021
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42. An Enhanced Tilted-Angle Acoustofluidic Chip for Cancer Cell Manipulation

Author

Wu, Fangda, primary, Shen, Ming Hong, additional, Yang, Jian, additional, Wang, Hanlin, additional, Mikhaylov, Roman, additional, Clayton, Aled, additional, Qin, Xinghua, additional, Sun, Chao, additional, Xie, Zhihua, additional, Cai, Meng, additional, Wei, Jun, additional, Liang, Dongfang, additional, Yuan, Fan, additional, Wu, Zhenlin, additional, Fu, Yongqing, additional, Yang, Zhiyong, additional, Sun, Xianfang, additional, Tian, Liangfei, additional, and Yang, Xin, additional

Published
2021
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47. Gallium Nitride: A Versatile Compound Semiconductor as Novel Piezoelectric Film for Acoustic Tweezer in Manipulation of Cancer Cells

Author

Sun, Chao, primary, Wu, Fangda, additional, Wallis, David J., additional, Shen, Ming Hong, additional, Yuan, Fan, additional, Yang, Jian, additional, Wu, Jianzhong, additional, Xie, Zhihua, additional, Liang, Dongfang, additional, Wang, Hanlin, additional, Tickle, Rowan, additional, Mikhaylov, Roman, additional, Clayton, Aled, additional, Zhou, You, additional, Wu, Zhenlin, additional, Fu, Yongqing, additional, Xun, Wenpeng, additional, and Yang, Xin, additional

Published
2020
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49. Photonic molecule quantum optics

Author

Liao, Kun, primary, Hu, Xiaoyong, additional, Gan, Tianyi, additional, Liu, Qihang, additional, Wu, Zhenlin, additional, Fan, Chongxiao, additional, Feng, Xilin, additional, Lu, Cuicui, additional, Liu, Yong-chun, additional, and Gong, Qihuang, additional

Published
2020
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