Bulletin of the American Physical Society
52nd Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 66, Number 6
Monday–Friday, May 31–June 4 2021; Virtual; Time Zone: Central Daylight Time, USA
Session C08: Experimental Techniques for Ion TrappingLive
|
Hide Abstracts |
Chair: Melissa Revelle, Sandia |
Tuesday, June 1, 2021 10:30AM - 10:42AM Live |
C08.00001: A novel surface-electrode trap design enabling electrically-driven non-Gaussian operations for trapped-ion CVQC Alexander Quinn, Jeremy Metzner, David J Wineland, David T Allcock We investigate the use of trapped ions for continuous-variable quantum computing (CVQC). CVQC, a quantum computing (QC) paradigm relatively unexplored in trapped ions, employs systems with large Hilbert spaces, e.g. the motional modes of ions in a trap. These modes can be controlled using external RF electric fields, with gate speeds comparable to those achieved in traditional qubit-based trapped-ion QC. In addition, the technical complexity of applying an RF voltage to an electrode is less than using laser beams or strong magnetic field gradients. Gate operations driven by RF electric fields that are useful for trapped-ion CVQC have already been demonstrated experimentally by other groups. These gates are all Gaussian however, and universal CVQC requires at least one non-Gaussian gate. The non-Gaussian gates used so far rely on laser beams, so the operations needed for universal CVQC cannot be carried out with RF electric fields alone. The best method to implement a non-Gaussian gate with RF electric fields remains an open question. As a possible solution, we have designed a new type of surface-electrode ion trap. We propose that this trap can, by generating an RF cubic potential, carry out a set of non-Gaussian gates, including trisqueezing, at speeds practical for QC. |
Tuesday, June 1, 2021 10:42AM - 10:54AM Live |
C08.00002: Construction of An Ion Trap with High-NA In-Vacuum Objectives for a Modular Quantum Computer Allison L Carter, Jameson O'Reilly, Yao De George Toh, Sagnik Saha, Christopher R Monroe One architecture for scaling trapped ion quantum computers consists of multiple reasonably-sized nodes connected with photonic links that entangle remote ions. Each node contains both memory qubits for storing information and communication qubits for generating photons. To date, demonstrations of this architecture have been limited by slow entanglement between nodes due to photon loss. We have built an ion trap system with two aspheric lenses inside the vacuum chamber with a numerical aperture of 0.8 and a working distance from the ion of 6 mm. The lenses collect 40% of the light emitted from a 138Ba+ ion, a large increase over the previously reported 10%, and may reduce fiber coupling sensitivity to vacuum window deformations. We discuss the design and testing of the light collection capabilities of this system and consider its incorporation in a quantum computer consisting of three separate modules. |
Tuesday, June 1, 2021 10:54AM - 11:06AM Live |
C08.00003: Development of a Portable Ion Trap for the Study of Ions under High-dose Radiation Jiafeng Cui, Yuanheng Xie, Marissa Donofrio, A.J. Rasmusson, Philip Richerme Ion traps have been established as a powerful tool for quantum simulation and computation in the past several decades. However, the resiliency of ion trap systems to extreme radiation environments, as may be found in space, remains largely unknown. Such investigations are primarily complicated by the difficulty of integrating high-dose radiation sources within standard atomic-physics laboratories. Here, we report on the development of a portable ion trap specifically designed to fit within test chambers located at high-dose radiation test facilities. Our platform is based on laser cooled Ytterbium ions, and the entire system is accommodated into 2 mobile rack units which comprise laser, electronics and physics package subsystems. To make the physics package compact and robust, a lumped circuit RLC resonator for RF source is also introduced.This study paves the road for future ion-trap-based quantum science in extreme environments. |
Tuesday, June 1, 2021 11:06AM - 11:18AM Live |
C08.00004: Experimental techniques for 100+ qubits in a linear ion trap Qiming Wu, Melina Filzinger, Yue Shi, Umang Mishra, Jiehang Zhang Trapped atomic ions is a prime platform for quantum simulations and quantum computing, While the fidelities are highest, scaling up the system size beyond a few dozen qubits remain as challenges. Here, we demonstrate experimental techniques for confining more than a hundred Be+ ions, a species with several important advantages: the light-mass permits fast spin-spin interaction with high fidelities; higher secular frequencies under the same trap q parameter, which is more sustainable for holding a long chain and mitigate the difficulties in trap fabrication. We demonstrate scalable techniques: fast and reliable loading of defect-free Be+ with laser ablation; high numerical aperture diffraction-limited microscope adaptable for deep ultraviolet to infrared wavelengths; and a room-temperature vacuum system the level of 10-12 Torr. Finally, we discuss novel parallel entangling gates beyond the existing schemes. |
Tuesday, June 1, 2021 11:18AM - 11:30AM Live |
C08.00005: Holographic optical manipulation of trapped-ion qubits for minimizing crosstalk errors in quantum processors Roland Hablützel, Chung-You Shih, Sainath Motlakunta, Nikhil Kotibhaskar, Anthony Vogliano, Rajibul Islam Trapped ions are among the most advanced platforms for quantum computation and simulation. Programmable, flexible and precise control over each ion is required to efficiently implement arbitrary quantum gates and simulate Hamiltonians. An important fundamental challenge towards this individual control is the unavoidable `crosstalk error’ due to micron-level inter-ion separation. Here, we present experimental results [1] from a holographic optical ion-addressing setup for Yb+ ions (λ = 369.5 nm) using a Digital Micromirror Device (DMD). This technique uses a reprogrammable hologram to modulate the wavefront of the addressing beam and thus engineer an adaptable and accurate amplitude and phase profile of light across the ions. Using a single ion as an aberration sensor, we compensate all aberrations to better than λ/20 and produce <10-4 intensity crosstalk error in arbitrary pair-wise addressing profiles. Such high-precision optical control will enable the simulation of arbitrary and dynamic lattice geometries of spins to be realized in a 1D chain of ions. This scheme relies on standard commercial hardware, can be readily extended to over a hundred ions, and adapted to other ion-species and platforms. |
Tuesday, June 1, 2021 11:30AM - 11:42AM Live |
C08.00006: Implementation and Characterization of a Cryogenic Two-Dimensional Ion Trap Array Justin F Niedermeyer, Nathan K Lysne, Jonas Keller, Katherine C McCormick, Susanna Todaro, Andrew C Wilson, Daniel H Slichter, Dietrich Leibfried Two-dimensional arrays of ions in individual microtraps are a promising technology for quantum computation and simulation. In collaboration with Sandia National Laboratories, we have developed micro-fabricated surface electrode traps that confine three ions on the vertices of equilateral triangles, with each ion confined in a separate potential well. This feature, and the small inter-ion distance (30 µm), allows for selective coupling between ions that can be dynamically changed during single experiments. In an effort to reduce motional decoherence of the ions, the traps are operated at cryogenic temperatures (~4 K). In principle, this approach enables simulation of arbitrary, tunable spin-lattice Hamiltonians. Quantum simulations of bosons in synthetic magnetic fields can also be performed using motional excitation of the ions (phonons) as the controllable quantum system of interest instead of the internal ion states. We will discuss recent results trapping and manipulating ions in one of these two-dimensional array traps. We also present characteristic features of this trap, including ion heating rates that indicate our ability to study single-quantum phenomena. |
Tuesday, June 1, 2021 11:42AM - 11:54AM Live |
C08.00007: Control of Ions in Cryogenic Two-Dimensional Arrays for Quantum Simulation Nathan K Lysne, Justin F Niedermeyer, Jonas Keller, Katherine C McCormick, Susanna L Todaro, Andrew C Wilson, Daniel H Slichter, Dietrich Leibfried Individual control over ions trapped in two-dimensional arrays allows for investigations of a variety of paradigmatic many-body Hamiltonians of interest to quantum computation and simulation. Yet, the challenge of building a device capable of single-ion quantum control not limited by motional decoherence or field noise means that no such array has been realized to date. In partnership with Sandia National Labs, we have developed a microfabricated surface-electrode trap operated at cryogenic temperatures to capture ions in a triangular array of individual confining potentials spaced 30 µm apart. The small inter-ion distance and independent control of each ion's trapping potential allows for tunable coupling of motional modes of the ions between sites during a given experimental run. We report on protocols to selectively address and read-out the state of an ion in a particular site in our trap, as well as recent results demonstrating inter-mode coupling and phonon exchange between ions in the array. These techniques may enable the use of this device as a quantum simulator to study Hamiltonians with arbitrary spin-spin couplings, as well as the use of motional excitations of the ion (phonons) as a resource for simulations of bosons in synthetic magnetic fields. |
Tuesday, June 1, 2021 11:54AM - 12:06PM Live |
C08.00008: Characterization and Control of Radial 2D Crystals in a linear Paul Trap Marissa Donofrio, Yuanheng Xie, A.J. Rasmusson, Evangeline H Wolanski, Jiafeng Cui, Philip Richerme One-dimensional ion chains in rf traps have seen remarkable success in engineering high-fidelity quantum gates and simulating 1D quantum spin systems. A comparable ability to control and probe two-dimensional ion crystals in rf traps could present a robust method for characterizing the ground states and dynamical properties of highly frustrated spin models. We experimentally study Coulomb crystals in the "radial-2D" phase, for which the crystal plane is defined by two radial principal axes of a linear Paul trap. We characterize ion positions, structural phases, normal mode frequencies, and effects of rf heating. We find that structural phase boundaries and vibrational mode frequencies are well-described by the pseudopotential approximation, and we observe that micromotion-induced heating is confined to the radial plane. Finally, we demonstrate stable, isolated, and low-noise transverse modes, establishing radial 2D crystals in linear Paul traps as a realistic platform for implementing several quantum simulation and computation proposals. |
Tuesday, June 1, 2021 12:06PM - 12:18PM Live |
C08.00009: Closed-cycle gas flow cryogenic ion trap apparatus Andrew Laugharn, Joseph Britton Trapped atomic ions are a leading platform for quantum information processing. Scaling to processors with 1000’s of ions is expected to require entanglement distribution using ion-photon interfaces mediated by small mode volume photonic structures. We report on the design and testing of a closed-cycle gas flow cryogenic apparatus for ion trapping that will enable rapid prototyping on integration of traps with novel photonic structures. The cryostat is designed to minimize vibration, mechanical drift, and temperature instability[1, 2, 3]. With an eye toward pursuing large qubit registers required for long-distance quantum networking, we note that cryogenic traps enable long ion chains[2], with reduced background gas collisions and motional heating. Our cryostat is rigidly mounted in an 11 inch bore of an optics table. It is mechanically decoupled from a Gifford-McMahon cryo-cooler that lies several meters away in an acoustic isolation box. Eight optical ports 4 inches above the table provide 360○ optical access. All UHV vacuum components, electrical penetrations and cryogenic ports lie under the optics table. We present measurements of the vibration, cooling power, and temperature stability of the apparatus. |
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700