Publications

Results 7001–7050 of 99,299

Search results

Jump to search filters

Entangling-gate error from coherently displaced motional modes of trapped ions

Physical Review A

Ruzic, Brandon P.; Barrick, T.A.; Hunker, J.D.; Law, Ryan; Mcfarland, Brian; Mcguinness, Hayden J.E.; Parazzoli, L.P.; Sterk, Jonathan D.; Van Der Wall, Jay W.; Stick, Daniel L.

Entangling gates in trapped-ion quantum computers are most often applied to stationary ions with initial motional distributions that are thermal and close to the ground state, while those demonstrations that involve transport generally use sympathetic cooling to reinitialize the motional state prior to applying a gate. Future systems with more ions, however, will face greater nonthermal excitation due to increased amounts of ion transport and exacerbated by longer operational times and variations over the trap array. In addition, pregate sympathetic cooling may be limited due to time costs and laser access constraints. In this paper, we analyze the impact of such coherent motional excitation on entangling-gate error by performing simulations of Mølmer-Sørenson (MS) gates on a pair of trapped-ion qubits with both thermal and coherent excitation present in a shared motional mode at the start of the gate. We quantify how a small amount of coherent displacement erodes gate performance in the presence of experimental noise, and we demonstrate that adjusting the relative phase between the initial coherent displacement and the displacement induced by the gate or using Walsh modulation can suppress this error. We then use experimental data from transported ions to analyze the impact of coherent displacement on MS-gate error under realistic conditions.

More Details
TYPE Journal Article YEAR 2022
DOIOSTIScopus

3D Simulations of OMEGA Implosions in Presence of Low Mode Asymmetries: Systematic Flow Anomalies and Impact of Low Modes on Implosion Performance

Colaitis, Arnaud; Igumenschev, Igor; Turnbull, David; Shah, Rahul; Edgell, Dana; Mannion, Owen M.; Stoeckl, Christian; Shvydky, Alex; Janezic, Roger; Kalb, Adam; Coa, Duc; Forrest, Chad; Kwiatkowski, Joe; Regan, Sean; Theobald, Wolfgang; Goncharov, Valeri; Froula, Dustin

Abstract not provided.

More Details
TYPE Conference Presentation YEAR 2022
DOIOSTI
Results 7001–7050 of 99,299
Results 7001–7050 of 99,299