Controlling trapping potentials and stray electric fields in a microfabricated ion trap through design and compensation

Abstract

Recent advances in quantum information processing with trapped ions have demonstrated the need for new ion trap architectures capable of holding and manipulating chains of many (>10) ions. Here we present the design and detailed characterization of a new linear trap, microfabricated with scalable complementary metal-oxide-semiconductor (CMOS) techniques, that is well-suited to this challenge. Forty-four individually controlled DC electrodes provide the many degrees of freedom required to construct anharmonic potential wells, shuttle ions, merge and split ion chains, precisely tune secular mode frequencies, and adjust the orientation of trap axes. Microfabricated capacitors on DC electrodes suppress radio-frequency pickup and excess micromotion, while a top-level ground layer simplifies modeling of electric fields and protects trap structures underneath. A localized aperture in the substrate provides access to the trapping region from an oven below, permitting deterministic loading of particular isotopic/elemental sequences via species-selective photoionization. The shapes of the aperture and radio-frequency electrodes are optimized to minimize perturbation of the trapping pseudopotential. Laboratory experiments verify simulated potentials and characterize trapping lifetimes, stray electric fields, and ion heating rates, while measurement and cancellation of spatially-varying stray electric fields permits the formation of nearly-equally spaced ion chains.

17 pages (including references), 7 figures

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Cited by in corpus (50)

• Ion-trap measurements of electric-field noise near surfaces
• Precise determination of micromotion for trapped-ion optical clocks
• Reliable transport through a microfabricated X-junction surface-electrode ion trap
• Engineering of Microfabricated Ion Traps and Integration of Advanced On-Chip Features
• A high-precision rf trap with minimized micromotion for an In+ multiple-ion clock
• Arbitrary Waveform Generator for Quantum Information Processing with Trapped Ions
• Individual-Ion Addressing with Microwave Field Gradients
• Chip-integrated voltage sources for control of trapped ions
• Heating and ion transport in a Y-junction surface-electrode trap
• Ball-grid array architecture for microfabricated ion traps
• How to wire a 1000-qubit trapped ion quantum computer
• Cryogenic silicon surface ion trap
• Spatially uniform single-qubit gate operations with near-field microwaves and composite pulse compensation
• Part-per-billion measurement of the $4^2{S}_{1/2}\to 3^2{D}_{5/2}$ electric quadrupole transition isotope shifts between ${}^{42,44,48}$Ca${}^{+}$ and ${}^{40}$Ca${}^{+}$
• Ion trajectory analysis for micromotion minimization and the measurement of small forces
• Transformed Composite Sequences for Improved Qubit Addressing
• Assembling a ring-shaped crystal in a microfabricated surface ion trap
• Single qubit manipulation in a microfabricated surface electrode ion trap
• Quantum simulations with complex geometries and synthetic gauge fields in a trapped ion chain
• Electric-field noise from carbon-adatom diffusion on a Au(110) surface: first-principles calculations and experiments
• Measurements of trapped-ion heating rates with exchangeable surfaces in close proximity
• Industrially Microfabricated Ion Trap with 1 eV Trap Depth
• Segmented ion-trap fabrication using high precision stacked wafers
• Ion trap architectures and new directions
• In-Vacuum Active Electronics for Microfabricated Ion Traps
• Modular cryostat for ion trapping with surface-electrode ion traps
• Microwave control electrodes for scalable, parallel, single-qubit operations in a surface-electrode ion trap
• Characterization of fluorescence collection optics integrated with a micro-fabricated surface electrode ion trap
• Scalable Multispecies Ion Transport in a Grid-Based Surface-Electrode Trap
• Comparison of ancilla preparation and measurement procedures for the Steane [[7,1,3]] code on a model ion trap quantum computer
• Transport-enabled entangling gate for trapped ions
• Modulating carrier and sideband coupling strengths in a standing wave gate beam
• Rapid Exchange Cooling with Trapped Ions
• Optimization and implementation of a surface-electrode ion trap junction
• Measurement of ion displacement via RF power variation for excess micromotion compensation
• Characterization of Fast Ion Transport via Position-Dependent Optical Deshelving
• Photo-induced charge carrier dynamics in a semiconductor-based ion trap investigated via motion-sensitive qubit transitions
• Cooperative engineering the multiple radio-frequency fields to reduce the X-junction barrier for ion trap chips
• Minimization of ion micromotion with artificial neural network
• Fast mixed-species quantum logic gates for trapped-ion quantum networks
• Micromotion compensation of trapped ions by qubit transition and direct scanning of dc voltages
• Test and characterization of multilayer ion traps on fused silica
• High-Speed Low-Crosstalk Detection of a ${}^{171}$Yb${}^{+}$ Qubit using Superconducting Nanowire Single Photon Detectors
• Analysis of Side-band Inequivalence
• Insensitivity of Ion Motional Heating Rate to Trap Material over a Large Temperature Range
• Error-Resilient Fast Entangling Gates for Scalable Ion-Trap Quantum Processors
• Spin squeezing an ultracold molecule
• Ion crystals in anharmonic traps
• Convenient Real-Time Monitoring of the Contamination of Surface Ion Trap
• Isotope-selective Ion Trapping via Sympathetic Cooling using a Surface-Electrode Trap with a Hole for Collimated Atomic Loading