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An Optical Fiber Interface To A Trapped Ion Quantum Computer
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Book Synopsis An Optical-fiber Interface to a Trapped-ion Quantum Computer by : Tony Hyun Kim
Download or read book An Optical-fiber Interface to a Trapped-ion Quantum Computer written by Tony Hyun Kim and published by . This book was released on 2011 with total page 187 pages. Available in PDF, EPUB and Kindle. Book excerpt: The trapped-ion quantum computer is an atom-based implementation of a quantum computer that has successfully demonstrated numerous quantum algorithms and the potential for scalability. Fundamental to its operation is the short-range Coulombic interaction among its atomic ion registers, which has led to the development of local, single-chip devices. In this work, we demonstrate the integration of an optical-fiber with a planar ion trap, and show the physical interaction between fiber light and the trapped-ion qubit. As the single-mode fiber is well-suited to the transport of single photons, the fiber interface (when augmented by an optical cavity) represents a means to link distantly located quantum computers through a common optical network. Hence, this work represents a step towards the paradigm of distributed quantum computing: self-contained, technically-simple processors may be optically linked together to perform large-scale quantum computation. This thesis is divided into two parts. In the first, we provide a thorough review of ion trap design and a detailed numerical analysis of trapped-ion motion. This theoretical discussion culminates with the development of an electronic technique that permits the arbitrary, in situ positioning of a trapped atom in the ion trap. The positioning ability is an enabling technology for trap-integration as it allows for complete freedom in the alignment of the trapped atom with respect to the integrated element. In the second part, the construction of the experimental setup and the integrated "fibertrap" is described. In our experiment, a single 38Sr+ is trapped 670 [mu]m above the end of an optical fiber in a cryogenic (8 K) surface-electrode ion trap. The fiber serves as an integrated source of laser light, which drives the quadrupole qubit transition of 88Sr+. Using in situ translation of the ion, the Gaussian beam profile of the fiber output is imaged, and the fiberion displacement, in units of the mode waist at the ion, is optimized to within 0.13 ± 0.10 of the mode center despite an initial offset of 3.30 ± 0.10 arising from fabrication. We also quantify the perturbative effects of the fiber dielectric on ion trap operation. Light-induced charging by 125 [mu]W of 674 nm fiber light is measured as an induced electric field of ~ 10 V/m at the ion, with charging and discharging time constants of 1.6 ± 0.3 s and 4.7 t 0.6 s. These measurements are of general importance to trapped-ion quantum computing, where the scalability of the platform depends crucially on the feasibility of on-chip optics integration.
Book Synopsis Quantum Computation and Quantum Information Theory by : Anton Zeilinger
Download or read book Quantum Computation and Quantum Information Theory written by Anton Zeilinger and published by World Scientific. This book was released on 2000 with total page 540 pages. Available in PDF, EPUB and Kindle. Book excerpt: Quantum information theory has revolutionised our view on the true nature of information and has led to such intriguing topics as teleportation and quantum computation. The field - by its very nature strongly interdisciplinary, with deep roots in the foundations both of quantum mechanics and of information theory and computer science - has become a major subject for scientists working in fields as diverse as quantum optics, superconductivity or information theory, all the way to computer engineers.
Book Synopsis Fiber Optic Integration in Planar Ion Traps by : Elizabeth Marie George
Download or read book Fiber Optic Integration in Planar Ion Traps written by Elizabeth Marie George and published by . This book was released on 2008 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: Atomic ion traps are are excellent tools in atomic physics for studying single ions. Accurate measurement of the ion's electronic state in these ion traps is required by both atomic clocks and quantum computation. Quantum computation with trapped ions can only scale to larger numbers of qubits if the ion traps and their laser delivery and measurement infrastructure can be scaled to smaller sizes. Fiber optics are a promising method of measurement because they collect a large fraction of light scattered by the trapped ions, and many optical fibers can be placed in a small area, allowing more ions to be measured in a small region. The question I address in this thesis is, "How can optical fibers be integrated onto planar ion traps?" This thesis presents a process I designed and implemented for integrating optical fibers onto planar ion traps as well as a system for integrating optical fibers into a cryogenic system. While the fiber integration was successful, we were unable to trap any ions in our fiber-integrated ion trap. We were able to show that the integrated fiber could collect light scattered from the surface of ion trap, and hypothesize that the large amount of dielectric present on the surface of the trap may have distorted the trapping potential and prevented us from trapping any ions. We also determined that scatter spots on the surface of the trap are a much bigger problem for fiber optic light collection systems than for traditional bulk optics systems. Finally, we propose a method of integration that could reduce the amount of exposed dielectric in the vicinity of the trap, as well as solve the problem of sensitivity to scatter spots.
Author :National Academies of Sciences, Engineering, and Medicine Publisher :National Academies Press ISBN 13 :030947969X Total Pages :273 pages Book Rating :4.3/5 (94 download)
Book Synopsis Quantum Computing by : National Academies of Sciences, Engineering, and Medicine
Download or read book Quantum Computing written by National Academies of Sciences, Engineering, and Medicine and published by National Academies Press. This book was released on 2019-04-27 with total page 273 pages. Available in PDF, EPUB and Kindle. Book excerpt: Quantum mechanics, the subfield of physics that describes the behavior of very small (quantum) particles, provides the basis for a new paradigm of computing. First proposed in the 1980s as a way to improve computational modeling of quantum systems, the field of quantum computing has recently garnered significant attention due to progress in building small-scale devices. However, significant technical advances will be required before a large-scale, practical quantum computer can be achieved. Quantum Computing: Progress and Prospects provides an introduction to the field, including the unique characteristics and constraints of the technology, and assesses the feasibility and implications of creating a functional quantum computer capable of addressing real-world problems. This report considers hardware and software requirements, quantum algorithms, drivers of advances in quantum computing and quantum devices, benchmarks associated with relevant use cases, the time and resources required, and how to assess the probability of success.
Book Synopsis Optical Characterization of a Phase Fresnel Lens for Trapped Ion Quantum Computing by : Benjamin Norton
Download or read book Optical Characterization of a Phase Fresnel Lens for Trapped Ion Quantum Computing written by Benjamin Norton and published by . This book was released on 2008 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Entangled World by : Jürgen Audretsch
Download or read book Entangled World written by Jürgen Audretsch and published by John Wiley & Sons. This book was released on 2008-07-11 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the quantum world, a particle can behave like a wave and accordingly seems to be in two places at the same time. This of course is contradictory to our daily experiences with classical particles. How then should this be understood? What happens in the transitional area between the classical world and quantum mechanics? The present book answers exciting questions like these in a way that is easy to follow and to understand and is shows that the link between these two worlds will have concrete and applied effects on our daily life in the near future. It will, for example, improve and change the conventional methods of information processing. With the help of quantum cryptography, it will be possible to communicate tap-proof. Using quantum computers we will be able to solve highly complicated problems in a very short time.
Book Synopsis Integrated Quantum Hybrid Systems by : Janik Wolters
Download or read book Integrated Quantum Hybrid Systems written by Janik Wolters and published by CRC Press. This book was released on 2015-09-04 with total page 291 pages. Available in PDF, EPUB and Kindle. Book excerpt: Integrated quantum hybrid devices, built from classical dielectric nanostructures and individual quantum systems, promise to provide a scalable platform to study and exploit the laws of quantum physics. On the one hand, there are novel applications, such as efficient computation, secure communication, and measurements with unreached accuracy. On th
Book Synopsis A Two-module Trapped-ion Quantum Computer Prototype by : Foni Raphaël Charles Le Brun-Ricalens
Download or read book A Two-module Trapped-ion Quantum Computer Prototype written by Foni Raphaël Charles Le Brun-Ricalens and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Integrated Chips and Optical Cavities for Trapped Ion Quantum Information Processing by :
Download or read book Integrated Chips and Optical Cavities for Trapped Ion Quantum Information Processing written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: By David R. Leibrandt.
Book Synopsis Quantum Gates, Sensors, and Systems with Trapped Ions by : Shannon Xuanyue Wang
Download or read book Quantum Gates, Sensors, and Systems with Trapped Ions written by Shannon Xuanyue Wang and published by . This book was released on 2012 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt: Quantum information science promises a host of new and useful applications in communication, simulation, and computational algorithms. Trapped atomic ions are one of the leading physical systems with potential to implement a large-scale quantum information system, but many challenges still remain. This thesis describes some experimental approaches to address several such challenges broadly organized under three themes: gates, sensors, and systems. Quantum logic gates are the fundamental building blocks for quantum algorithms. Although they have been demonstrated with trapped ions previously, scalability requires miniaturizing ion traps by using a surface-electrode geometry. Using a single ion in a surface-electrode trap, we perform a two-qubit entangling gate and fully characterize it via quantum process tomography, as an initial validation of surface-electrode ion traps for quantum information processing. Good logic gates are often good sensors for fast fluctuations and energy changes in their environment. Trapped ions are sensitive to fluctuating and static charges, leading to motional state decoherence (heating) and instabilities, problems exacerbated by the surface-electrode geometry. We investigate the material dependence of heating, specifically with aluminum and superconducting traps, to elucidate the physical origin of these fluctuating charges. Static charging is hypothesized to be caused by the trapping and cooling lasers due to the photoelectric effect. We perform systematic experiments with aluminum, gold, and copper traps with lasers at various wavelengths to validate this hypothesis. Realizing quantum processors at the system level requires models and tools for predicting system performance, demonstration of good classical and quantum control, and techniques for integrating different quantum systems. We develop a modeling system for trapped ion quantum computing experiments and simulate the effect of physical and technical noise sources on practical realizations of quantum algorithms in a trapped ion system. We experimentally demonstrate several such algorithms, including the quantum Fourier transform, order-finding, and Shor's algorithm on up to 5 ions. These experiments highlight several unique advantages of ion trap systems and help identify needs for further development. Finally, we explore the integration of ion traps with optical elements including mirrors and photon detectors as key elements in creating future hybrid quantum systems.
Book Synopsis Integrated Chips and Optical Cavities for Trapped Ion Quantum Information Processing by : David R. Leibrandt
Download or read book Integrated Chips and Optical Cavities for Trapped Ion Quantum Information Processing written by David R. Leibrandt and published by . This book was released on 2009 with total page 169 pages. Available in PDF, EPUB and Kindle. Book excerpt: (cont.) Cavity cooling is demonstrated for the first time with trapped ions, and for the first time in the parameter regime where cooling to the motional ground state is possible. The measured cavity cooling dynamics are found to agree with a rate equation model without any free parameters. The third and final part of the thesis presents a theoretical proposal for interconversion between single trapped ion qubits and single photon qubits for quantum communication. The idea is to map the state of the single ion qubit to a superradiant collective state of several ions, which then couples strongly with single photons in an optical cavity.
Author :National Academies of Sciences, Engineering, and Medicine Publisher :National Academies Press ISBN 13 :0309499542 Total Pages :315 pages Book Rating :4.3/5 (94 download)
Book Synopsis Manipulating Quantum Systems by : National Academies of Sciences, Engineering, and Medicine
Download or read book Manipulating Quantum Systems written by National Academies of Sciences, Engineering, and Medicine and published by National Academies Press. This book was released on 2020-09-14 with total page 315 pages. Available in PDF, EPUB and Kindle. Book excerpt: The field of atomic, molecular, and optical (AMO) science underpins many technologies and continues to progress at an exciting pace for both scientific discoveries and technological innovations. AMO physics studies the fundamental building blocks of functioning matter to help advance the understanding of the universe. It is a foundational discipline within the physical sciences, relating to atoms and their constituents, to molecules, and to light at the quantum level. AMO physics combines fundamental research with practical application, coupling fundamental scientific discovery to rapidly evolving technological advances, innovation and commercialization. Due to the wide-reaching intellectual, societal, and economical impact of AMO, it is important to review recent advances and future opportunities in AMO physics. Manipulating Quantum Systems: An Assessment of Atomic, Molecular, and Optical Physics in the United States assesses opportunities in AMO science and technology over the coming decade. Key topics in this report include tools made of light; emerging phenomena from few- to many-body systems; the foundations of quantum information science and technologies; quantum dynamics in the time and frequency domains; precision and the nature of the universe, and the broader impact of AMO science.
Book Synopsis Robust Quantum Logic for Trapped Ion Quantum Computers by : Anna Elizabeth Webb
Download or read book Robust Quantum Logic for Trapped Ion Quantum Computers written by Anna Elizabeth Webb and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Colloquium: Quantum Networks with Trapped Ions by :
Download or read book Colloquium: Quantum Networks with Trapped Ions written by and published by . This book was released on 2010 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: Quantum computation and communication exploit the quantum properties of superposition and entanglement in order to perform tasks that may be impossible using classical means. In this Colloquium recent experimental and theoretical progress in the generation of entangled quantum networks based on the use of optical photons as carriers of information between fixed trapped atomic ion quantum memories are reviewed. Taken together, these quantum platforms offer a promising vision for the realization of a large-scale quantum network that could impact the future of communication and computation.
Book Synopsis Experimental Issues in Coherent Quantum-State Manipulation of Trapped Atomic Ions by :
Download or read book Experimental Issues in Coherent Quantum-State Manipulation of Trapped Atomic Ions written by and published by . This book was released on 1998 with total page 71 pages. Available in PDF, EPUB and Kindle. Book excerpt: Methods for, and limitations to, the generation of entangled states of trapped atomic ions are examined. As much as possible, state manipulations are described in terms of quantum logic operations since the conditional dynamics implicit in quantum logic is central to the creation of entanglement. Keeping with current interest, some experimental issues in the proposal for trapped-ion quantum computation by J.I. Cirac and P. Zoller (University of Innsbruck) are discussed. Several possible decoherence mechanisms are examined and what may be the more important of these are identified. Some potential applications for entangled states of trapped-ions which lie outside the immediate realm of quantum computation are also discussed.
Book Synopsis A Single Trapped Rydberg Ion by : Gerard Higgins
Download or read book A Single Trapped Rydberg Ion written by Gerard Higgins and published by Springer Nature. This book was released on 2019-10-22 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt: Systems of trapped ions and systems of ultracold Rydberg atoms are used at the forefront of quantum physics research and they make strong contenders as platforms for quantum technologies. Trapped Rydberg ions are a new hybrid technology envisaged to have both the exquisite control of trapped ion systems and the strong interactions of Rydberg atoms. In this work a single trapped Rydberg ion is experimentally investigated. A trapped strontium ion is excited to Rydberg states using two ultraviolet lasers. Effects of the strong trapping electric fields on the highly-sensitive Rydberg ion are studied. After mitigating unwanted trap effects, the ion is coherently excited to Rydberg states and a quantum gate is demonstrated. This thesis lays much of the experimental groundwork for research using this novel system.
Book Synopsis Experiments with Trapped Ions by : Jennifer Flora Lilieholm
Download or read book Experiments with Trapped Ions written by Jennifer Flora Lilieholm and published by . This book was released on 2020 with total page 71 pages. Available in PDF, EPUB and Kindle. Book excerpt: Quantum computing promises to revolutionize modern computation. The race to establish a reliable quantum computing system has spurred research over the globe with the goal of establishing a reliable qubit system. One of the more promising candidates are trapped ions. To that end, I have characterized, improved, and designed experiments to be performed in a novel parabolic mirror ion trap. We measured the trap to have a light collection efficiency of 39%, nearly an order of magnitude higher than the light collection of ion traps utilizing standard collection optics. The parabolic mirror also improves the quality of image collected from a trapped ion, but is limited by the micromotion the ion undergoes while at the optical focus. We designed a new trap component to allow radial control over the ion position by moving the RF null, instead of displacing it with DC bias plates. This improved trapping system is a key part of our plan to to remotely entangle an In donor defect in ZnO with a single trapped Yb+ using a 369 nm photon bus. The lifetime of the relevant ionic state is longer than that of the ZnO system by a factor of 6, leading to a greatly decreased temporal overlap in their emitted photons and thus decreased fidelity in the final entangled state if left unattended. This temporal mismatch is a long outstanding challenge when entangling disparate quantum systems, and to address it I performed numerical calculations to design an excitation pulse which can shape the emitted In photon to have an overlap of 0.99 with the Yb+ photon. This leads to a calculated entangled state fidelity of 94% and an entangled state generation rate of 21 kHz with reasonable experimental parameters. Future directions of the parabolic mirror project are the construction of an ellipsoidal mirror trap which is expected to collect light from 95% of the solid angle surrounding a trapped ion. This high light collection will enable investigations into the time dynamics of quantum jumps. These jumps occur when a weakly driven system is continuously measured, and their appearance is entirely random. However, recent work in an artificial superconducting atom suggests that there is a latency period in other transitions which precedes a jump, allowing for these events to be 'caught'. We endeavor to confirm this behavior in a trapped ion, confirming the discovery for a real atomic system.
