Ion Transport and Reordering in a 2D Trap Array

Abstract

Scaling quantum information processors is a challenging task, requiring manipulation of a large number of qubits with high fidelity and a high degree of connectivity. For trapped ions, this can be realized in a 2D array of interconnected traps in which ions are separated, transported, and recombined to carry out quantum operations on small subsets of ions. Here, functionality of a junction connecting orthogonal linear segments in a 2D trap array to reorder a two‐ion crystal is demonstrated. The secular motion of the ions experiences low energy gain and the internal qubit levels maintain coherence during the reordering process, therefore demonstrating a promising method for providing all‐to‐all connectivity in a large‐scale, 2D or 3D trapped‐ion quantum information processor.

Design, fabrication and characterization of a micro-fabricated stacked-wafer segmented ion trap with two X-junctions

“…In addition, a central challenge in realizing high connectivity between qubits is to implement some means of re-configuring ion chains. This can be performed to a limited extent using rotations of ion chains [12][13][14], but a more flexible approach is to implement two-dimensional junctions, whereby selection of the output channel can be performed for each ion according to the desired protocol, which is implemented by the choice of dynamic potentials applied to the electrodes [15][16][17][18][19]. To date, traps incorporating junctions have been successfully fabricated and operated using three-dimensional electrode structures and with electrodes laid out on a two-dimensional surface.…”

Quasienergy operators and generalized squeezed states for systems of trapped ions

“…Late progress and results illustrate that universal quantum computing (QC) can be generalized to multilevel qudits [90,91]. Trapped ions represent an example of a pristine environment that enables scientists to acquire excellent quantum control [42,43,48,[92][93][94][95], which makes them perfect candidates towards implementing qudit-based quantum information processing (QIP) [47,96,97]. Previous work has not fully explored the practicality of implementing trapped-ion qudits accounting for known experimental error sources.…”

“…Recent advances in quantum optics enable trapping of single particles or atoms [19,[37][38][39], while progress in quantum engineering techniques allows preparing these particles in well-defined quantum states [40,41], under conditions of accurate control of the interaction between a quantum system (trapped ions) and the environment [42][43][44][45][46][47][48]. Besides quantum optics CS are of large interest, starting from pure mathematical topics up to physical applications such as quantum gravity [49,50].…”

Shortcuts to adiabatic rotation of a two-ion chain

“…Pure motional control without internal state transitions is in particular crucial in proposals of two-qubit gates, see e.g. [1], or interferometry [2][3][4], as well as to scale up the number of ions for quantum information processing [5][6][7][8][9][10][11][12]. The toolbox of basic operations induced by controlling the voltage of electrodes in different Paul trap configurations or detuned laser fields includes transport, expansions and compressions, separation and merging of ion chains, and rotations, the latter being the central topic of this work.…”