Relevant bibliographies by topics / Quantum Gate Fidelity

Academic literature on the topic 'Quantum Gate Fidelity'

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Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Quantum Gate Fidelity"

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Magesan, Easwar. "Depolarizing behavior of quantum channels in higher dimensions." Quantum Information and Computation 11, no. 5&6 (May 2011): 466–84. http://dx.doi.org/10.26421/qic11.5-6-8.

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The paper analyzes the behavior of quantum channels, particularly in large dimensions, by proving various properties of the quantum gate fidelity. Many of these properties are of independent interest in the theory of distance measures on quantum operations. A non-uniqueness result for the gate fidelity is proven, a consequence of which is the existence of non-depolarizing channels that produce a constant gate fidelity on pure states. Asymptotically, the gate fidelity associated with any quantum channel is shown to converge to that of a depolarizing channel. Methods for estimating the minimum of the gate fidelity are also presented.
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Li, Ran, and Frank Gaitan. "High-fidelity universal quantum gates." Quantum Information and Computation 10, no. 11&12 (November 2010): 936–46. http://dx.doi.org/10.26421/qic10.11-12-4.

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Twisted rapid passage is a type of non-adiabatic rapid passage that generates controllable quantum interference effects that were first observed experimentally in $2003$. It is shown that twisted rapid passage sweeps can be used to implement a universal set of quantum gates $\calGU$ that operate with high-fidelity. The gate set $\calGU$ consists of the Hadamard and NOT gates, together with variants of the phase, $\pi /8$, and controlled-phase gates. For each gate $g$ in $\calGU$, sweep parameter values are provided which simulations indicate will produce a unitary operation that approximates $g$ with error probability$P_{e} < 10^{-4}$. Note that \textit{all\/} gates in $\calGU$ are implemented using a \textit{single family\/} of control-field, and the error probability for each gate falls below the rough-and-ready estimate for the accuracy threshold $P_{a}\sim 10^{-4}$.
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Zhao, Jie, Kui Liu, Hao Jeng, Mile Gu, Jayne Thompson, Ping Koy Lam, and Syed M. Assad. "A high-fidelity heralded quantum squeezing gate." Nature Photonics 14, no. 5 (February 17, 2020): 306–9. http://dx.doi.org/10.1038/s41566-020-0592-2.

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Ye, Yangsen, Sirui Cao, Yulin Wu, Xiawei Chen, Qingling Zhu, Shaowei Li, Fusheng Chen, et al. "Realization of High-Fidelity Controlled-Phase Gates in Extensible Superconducting Qubits Design with a Tunable Coupler." Chinese Physics Letters 38, no. 10 (November 1, 2021): 100301. http://dx.doi.org/10.1088/0256-307x/38/10/100301.

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High-fidelity two-qubit gates are essential for the realization of large-scale quantum computation and simulation. Tunable coupler design is used to reduce the problem of parasitic coupling and frequency crowding in many-qubit systems and thus thought to be advantageous. Here we design an extensible 5-qubit system in which center transmon qubit can couple to every four near-neighboring qubits via a capacitive tunable coupler and experimentally demonstrate high-fidelity controlled-phase (CZ) gate by manipulating central qubit and one near-neighboring qubit. Speckle purity benchmarking and cross entropy benchmarking are used to assess the purity fidelity and the fidelity of the CZ gate. The average purity fidelity of the CZ gate is 99.69±0.04% and the average fidelity of the CZ gate is 99.65±0.04%, which means that the control error is about 0.04%. Our work is helpful for resolving many challenges in implementation of large-scale quantum systems.
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Xue, Xiao, Maximilian Russ, Nodar Samkharadze, Brennan Undseth, Amir Sammak, Giordano Scappucci, and Lieven M. K. Vandersypen. "Quantum logic with spin qubits crossing the surface code threshold." Nature 601, no. 7893 (January 19, 2022): 343–47. http://dx.doi.org/10.1038/s41586-021-04273-w.

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AbstractHigh-fidelity control of quantum bits is paramount for the reliable execution of quantum algorithms and for achieving fault tolerance—the ability to correct errors faster than they occur1. The central requirement for fault tolerance is expressed in terms of an error threshold. Whereas the actual threshold depends on many details, a common target is the approximately 1% error threshold of the well-known surface code2,3. Reaching two-qubit gate fidelities above 99% has been a long-standing major goal for semiconductor spin qubits. These qubits are promising for scaling, as they can leverage advanced semiconductor technology4. Here we report a spin-based quantum processor in silicon with single-qubit and two-qubit gate fidelities, all of which are above 99.5%, extracted from gate-set tomography. The average single-qubit gate fidelities remain above 99% when including crosstalk and idling errors on the neighbouring qubit. Using this high-fidelity gate set, we execute the demanding task of calculating molecular ground-state energies using a variational quantum eigensolver algorithm5. Having surpassed the 99% barrier for the two-qubit gate fidelity, semiconductor qubits are well positioned on the path to fault tolerance and to possible applications in the era of noisy intermediate-scale quantum devices.
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Liu, Teng, Peng-Fei Lu, Bi-Ying Hu, Hao Wu, Qi-Feng Lao, Ji Bian, Yang Liu, Feng Zhu, and Le Luo. "Phonon-mediated many-body quantum entanglement and logic gates in ion traps." Acta Physica Sinica 71, no. 8 (2022): 1. http://dx.doi.org/10.7498/aps.71.20220360.

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The implementation of high-fidelity multi-ion entangled states and quantum gates are the basis for ion trap quantum computing. There are developed quantum gate experimental schemes for realizing multi-ion entanglement and quantum gate, such as Mølmer-Sørensen Gate and Cirac-Zoller Gate; In recent years, there are also ultrafast entanglement gates that operate outside the Lamb-Dicke regime by designing ultrafast pulse sequences. In this typical many-body quantum system, these entanglement gate schemes all couple the spin states between ions by driving the phonon energy level or motion state of the ion chain. To improve the fidelity of quantum gates, they all use modulated laser pulses or appropriately designed pulse sequences to decouple the multi-mode motion states. In this review, we summarize and analyze the essential aspects of the realization of these entanglement gate schemes from the theories and experiments, and we also reveal the basic physical process of realizing quantum gates through nonlinear interactions in non-equilibrium processes by driving ion chain motion states.
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Johnston, Nathaniel, and David W. Kribs. "Quantum gate fidelity in terms of Choi matrices." Journal of Physics A: Mathematical and Theoretical 44, no. 49 (November 18, 2011): 495303. http://dx.doi.org/10.1088/1751-8113/44/49/495303.

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Ni, Kang-Kuen, Till Rosenband, and David D. Grimes. "Dipolar exchange quantum logic gate with polar molecules." Chemical Science 9, no. 33 (2018): 6830–38. http://dx.doi.org/10.1039/c8sc02355g.

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Patel, Raj B., Joseph Ho, Franck Ferreyrol, Timothy C. Ralph, and Geoff J. Pryde. "A quantum Fredkin gate." Science Advances 2, no. 3 (March 2016): e1501531. http://dx.doi.org/10.1126/sciadv.1501531.

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Minimizing the resources required to build logic gates into useful processing circuits is key to realizing quantum computers. Although the salient features of a quantum computer have been shown in proof-of-principle experiments, difficulties in scaling quantum systems have made more complex operations intractable. This is exemplified in the classical Fredkin (controlled-SWAP) gate for which, despite theoretical proposals, no quantum analog has been realized. By adding control to the SWAP unitary, we use photonic qubit logic to demonstrate the first quantum Fredkin gate, which promises many applications in quantum information and measurement. We implement example algorithms and generate the highest-fidelity three-photon Greenberger-Horne-Zeilinger states to date. The technique we use allows one to add a control operation to a black-box unitary, something that is impossible in the standard circuit model. Our experiment represents the first use of this technique to control a two-qubit operation and paves the way for larger controlled circuits to be realized efficiently.
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Royer, Baptiste, Arne L. Grimsmo, Nicolas Didier, and Alexandre Blais. "Fast and high-fidelity entangling gate through parametrically modulated longitudinal coupling." Quantum 1 (May 11, 2017): 11. http://dx.doi.org/10.22331/q-2017-05-11-11.

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We investigate an approach to universal quantum computation based on the modulation of longitudinal qubit-oscillator coupling. We show how to realize a controlled-phase gate by simultaneously modulating the longitudinal coupling of two qubits to a common oscillator mode. In contrast to the more familiar transversal qubit-oscillator coupling, the magnitude of the effective qubit-qubit interaction does not rely on a small perturbative parameter. As a result, this effective interaction strength can be made large, leading to short gate times and high gate fidelities. We moreover show how the gate infidelity can be exponentially suppressed with squeezing and how the entangling gate can be generalized to qubits coupled to separate oscillators. Our proposal can be realized in multiple physical platforms for quantum computing, including superconducting and spin qubits.
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Dissertations / Theses on the topic "Quantum Gate Fidelity"

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Sepiol, Martin. "A high-fidelity microwave driven two-qubit quantum logic gate in 43Ca+." Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:9cafcc3e-32c2-41dc-874d-632dcc402428.

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Quantum computers offer great potential for significant speedup in executing certain algorithms compared to their classical counterparts. One of the most promising physical systems in which implementing such a device seems viable are trapped atomic ions. All of the fundamental operations needed for quantum information processing have already been experimentally demonstrated in trapped ion systems. Today, the remaining two obstacles are to improve the fidelities of these operations up to the point where quantum error correction techniques can be successfully applied, as well as to scale up the present systems to a higher number of quantum bits (qubits). This thesis addresses both issues. On the one hand, it decribes the experimental implementation of a high-fidelity two-qubit quantum logic gate, which is the most technically demanding fundamental operation to realise in practice. On the other hand, the presented work is carried out in a microfabricated surface ion trap - an architecture that holds the promise of scalability. The gate is applied directly to hyperfine "atomic clock" qubits in 43Ca+ ions using the near-field microwave magnetic field gradient produced by an integrated trap electrode. To protect the gate against fluctuating energy shifts of the qubit states, as well as to avoid the need to null the microwave field at the position of the ions, a dynamically decoupled Mølmer-Sørensen scheme is employed. After accounting for state preparation and measurement errors, the achieved gate fidelity is 99.7(1)%. In previous work, the same apparatus has been used to demonstrate coherence times of T*2 ≈ 50 s and all single-qubit operations with fidelity > 99.95%. To gain access to the "atomic clock" qubit transition in 43Ca+, a static magnetic field of 146G is applied. The resulting energy level Zeeman-structure is spread over many times the linewidth of the atomic transition used for Doppler cooling. This thesis presents a simple and robust method for Doppler cooling and obtaining high fluorescence from this qubit in spite of the complicated level structure. A temperature of 0.3mK, slightly below the Doppler limit, is reached.
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Zarantonello, Giorgio [Verfasser], and Christian [Akademischer Betreuer] Ospelkaus. "Robust high fidelity microwave near-field entangling quantum logic gate / Giorgio Zarantonello ; Betreuer: Christian Ospelkaus." Hannover : Gottfried Wilhelm Leibniz Universität Hannover, 2020. http://d-nb.info/1214367097/34.

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Töyrä, Daniel. "Fidelity of geometric and holonomic quantum gates for spin systems." Thesis, Uppsala universitet, Teoretisk kemi, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-222152.

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Geometric and holonomic quantum gates perform transformations that only dependon the geometry of a loop covered by the parameters controlling the gate. Thesegates require adiabatic time evolution, which is achieved in the limit when the looptakes infinite time to complete. However, it is of interest to also know thetransformation properties of the gates for finite run times. It has been shown [Phys.Rev. A 73, 022327 (2006)] that some holonomic gates for a trapped ion system showrevival structures, i.e., for some finite run time the gate performs the sametransformation as it does in the adiabatic limit. The purpose of this thesis is to investigate if similar revival structures are shown alsofor geometric and holonomic quantum gates for spin systems. To study geometricquantum gates an NMR setup for spin-1/2 particles is used, while an NQR setup forspin-3/2 particles is used to study holonomic quantum gates. Furthermore, for thegeometric quantum gates the impact of some open system effects are examined byusing the quantum jump approach. The non-adiabatic time evolution operators of thesystems are calculated and compared to the corresponding adiabatic time evolutionoperators by computing their operator fidelity. The operator fidelity ranges between0 and 1, where 1 means that the gates are identical up to an unimportant phasefactor. All gates show an oscillating dependency on the run time, and some Abeliangates even show true revivals, i.e., the operator fidelity reaches 1.
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Labaziewicz, Jarosław. "High fidelity quantum gates with ions in cryogenic microfabricated ion traps." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/45167.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 2008.
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Includes bibliographical references (p. 135-146).
While quantum information processing offers a tantalizing possibility of a significant speedup in execution of certain algorithms, as well as enabling previously unmanageable simulations of large quantum systems, it remains extremely difficult to realize experimentally. Recently, fundamental building blocks of a quantum computer, including one and two qubit gates, teleportation and error correction, were demonstrated using trapped atomic ions. Scaling to a larger number of qubits requires miniaturization of the ion traps, currently limited by the sharply increasing motional state decoherence at sub-100 [mu]m ion-electrode distances. This thesis explores the source and suppression of this decoherence at cryogenic temperatures, and demonstrates fundamental logic gates in a surface electrode ion trap. Construction of the apparatus requires the development of a number of experimental techniques. Design, numerical simulation and implementation of a surface electrode ion trap is presented. Cryogenic cooling of the trap to near 4 K is accomplished by contact with a bath cryostat. Ions are loaded by ablation or photoionization, both of which are characterized in terms of generated stray fields and heat load. The bulk of new experimental results deals with measurements of electric field noise at the ion's position. Upon cooling to 6 K, the measured rates are suppressed by up to 7 orders of magnitude, more than two orders of magnitude below previously published data for similarly sized traps operated at room temperature. The observed noise depends strongly on fabrication process, which suggests further improvements are possible. The measured dependence of the electric field noise on temperature is inconsistent with published models, and can be explained using a continuous spectrum of activated fluctuators. The fabricated surface electrode traps are used to demonstrate coherent operations and the classical control required for trapped ion quantum computation. The necessary spectral properties of coherent light sources are achieved with a novel design using optical feedback to a triangular, medium finesse, cavity, followed by electronic feedback to an ultra-high finesse reference cavity.
(cont.) Single and two qubit operations on a single ion are demonstrated with classical fidelity in excess of 95%. Magnetic field gradient coils built into the trap allow for individual addressing of ions, a prerequisite to scaling to multiple qubits.
by Jarosław Labaziewicz.
Ph.D.
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Navickas, Tomas. "Towards high-fidelity microwave driven multi-qubit gates on microfabricated surface ion traps." Thesis, University of Sussex, 2018. http://sro.sussex.ac.uk/id/eprint/79060/.

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Kleißler, Felix. "Towards Solid-State Spin Based, High-Fidelity Quantum Computation." Doctoral thesis, 2018. http://hdl.handle.net/11858/00-1735-0000-002E-E51C-0.

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Book chapters on the topic "Quantum Gate Fidelity"

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Capmany, José, and Daniel Pérez. "Programmable Integrated Photonics for Quantum Systems." In Programmable Integrated Photonics, 227–52. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780198844402.003.0007.

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Programmable photonics can find applications in myriad areas including the quantum information field, which encompasses communications, computing, sensing and tomography. Large-scale bulk optics setups previously prevented the development of more complex and scalable quantum optics configurations. Linear optic systems with the required fidelity require a strict control of interference through demanding phase stability mechanisms. Integrating a considerable number of photonic elements on a chip in order to implement multi-port interferometers has become the only viable technological path towards quantum information systems. This chapter introduces the applications of programmable photonics to quantum information systems. After introducing the general framework of a programmable quantum photonic system integrated on a chip and briefly describing the role of more external components such as sources and detectors, it covers the relationship between reconfigurable integrated optic circuits and linear optical quantum gates, quantum transport simulation, boson sampling and complex Hadamard and quantum Fourier transforms.
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Wereszczyński, Kamil, and Krzysztof Cyran. "Two-Rail Photonic Qubit Utilizing the Quantum Holographic Imaging Idea." In Holography - Recent Advances and Applications [Working Title]. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.106889.

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We present the novel approach to physical implementation of qubits with the technology of photonic chips. Proposed multi-rail qubit model, called QBell, utilizes hyper-entanglement to work in Decoherence Free Subspace on physical layer. This makes this solution robust and can result in increasing fidelity of quantum circuit used in this model. We elaborate the two-rail case. We define the QBell and discuss its internal structure. We construct also one- and two-qubit gates to make the model comprehensive and ready to implement. Proposed model utilizes the early-stage ideas for optical quantum computation, but by using the polarization and position entanglement as the resource of computation allows to avoid the general problem of them, like heralded photon technique. The technology of photonic chips allows to brake other limitations that are pointed in the text. The presented model was inspired by quantum holographic imaging and uses the holographic technique for implementing the z-rotation operation. The final product will be the photonic quantum processor using multi-rail qubits. It will find the application in many domains (e.g., medical) on earth and in the space.
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Conference papers on the topic "Quantum Gate Fidelity"

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Qiu, Jiamin, Hong Peng, and Ying Yan. "High-fidelity gate operations with short paths in a Λ system." In Quantum Information Technology. SPIE, 2023. http://dx.doi.org/10.1117/12.2651898.

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Mosakowski, J., T. Ferrus, D. A. Williams, E. Owen, M. Dean, and C. H. W. Barnes. "Controlling single qubit gate fidelity in double quantum dots." In 2014 Silicon Nanoelectronics Workshop (SNW). IEEE, 2014. http://dx.doi.org/10.1109/snw.2014.7348583.

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Serino, L., J. Gil-Lopez, M. Stefszky, R. Ricken, C. Eigner, B. Brecht, and C. Silberhorn. "Multi-Output Quantum Pulse Gate: a High-Dimensional Temporal-Mode Decoder." In Frontiers in Optics. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/fio.2022.jtu4a.29.

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We demonstrate a temporal-mode decoder based on a multi-output quantum pulse gate. Measurement tomography on a complete set of five-dimensional mutually unbiased bases confirms single-photon-level operation at telecom wavelengths with an average fidelity of 96%.
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Li, Ran, and Frank Gaitan. "High-fidelity universal quantum gates through quantum interference." In SPIE Defense, Security, and Sensing, edited by Eric J. Donkor, Andrew R. Pirich, and Howard E. Brandt. SPIE, 2010. http://dx.doi.org/10.1117/12.851211.

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Barthel, P., J. Casanova, P. Huber, Th Sriarunothai, M. Plenio, and Ch Wunderlich. "Robust High-Fidelity Two-Qubit Gates Using Pulsed Dynamical Decoupling." In Quantum 2.0. Washington, D.C.: OSA, 2020. http://dx.doi.org/10.1364/quantum.2020.qth6a.6.

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Menssen, Adrian, Artur Hermans, Ian Christen, Mark Dong, Matthew Zimmermann, Andrew J. Leenheer, Thomas Propson, et al. "Scalable Optical Control for Atomic Qubits in a Silicon Nitride Platform." In CLEO: Science and Innovations. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/cleo_si.2022.stu4f.3.

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Here we present a new integrated photonics platform for optical quantum control that allows the generation of multiple high fidelity optical pulses to implement quantum gates on individual atomic qubits at speeds exceeding several hundred MHz.
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Pinske, Julien, Vera Neef, Matthias Heinrich, Stefan Scheel, and Alexander Szameit. "Robust Linear Optical Quantum Computation with Non-Abelian Geometric Phases." In Quantum 2.0. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/quantum.2022.qth4a.4.

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A proposal for the construction of geometrically robust linear optical quantum circuits by means of nonadiabatic geometric phases is presented. Our proof-of-principle designs of holonomic single-qubit gates enable high-fidelity unitaries.
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Sola, Ignacio R., and Bo Y. Chang. "Spatiotemporal Control of Trapped Rydberg Qubits." In Quantum 2.0. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/quantum.2022.qw2a.33.

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We show how to implement faster high fidelity two-qubit gates on neutral atoms through the dipole blockade mechanism by exciting the qubits with the same pulses after optimizing both temporal and spatial parameters.
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Popov, M., N. Sterligov, O. Lakhmanskaya, and K. Lakhmanskiy. "Multispecies Segmented Trapped Ion Architecture for Scalable Quantum Computing." In Quantum 2.0. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/quantum.2022.qw3a.7.

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Here we propose a new way to scale up trapped ion quantum computer based on long multispecies ion chains. Mass difference of ions leads to chain segmentation and allows to implement high-fidelity entangling gates.
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Monroe, Christopher, and Paul Haljan. "High-fidelity and scalable quantum gates with trapped atoms." In Frontiers in Optics. Washington, D.C.: OSA, 2003. http://dx.doi.org/10.1364/fio.2003.tuc1.

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Reports on the topic "Quantum Gate Fidelity"

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Economou, Sophia E. High Fidelity Quantum Gates via Analytically Solvable Pulses. Fort Belvoir, VA: Defense Technical Information Center, June 2012. http://dx.doi.org/10.21236/ada594443.

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