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Klaus Mølmer

Time-optimal control of collisional SWAP gates in ultracold atomic systems

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We use quantum optimal control to identify fast collision-based two-qubit SWAP gates in ultracold atoms. We show that a significant speedup can be achieved by optimizing the full gate instead of separately optimizing the merge-wait-separate sequence of the trapping potentials. Our optimal strategy does not rely on the atoms populating the lowest eigenstates of the merged potential, and it crucially includes the accumulation of quantum phases before the potentials are fully merged. Our analyses transcend the particular trapping geometry, but for comparison with previous works, we present systematic results for an optical lattice and find greatly improved gate durations and fidelities.

OriginalsprogEngelsk
Artikelnummer052314
TidsskriftPhysical Review A
Vol/bind100
Nummer5
Antal sider13
ISSN2469-9926
DOI
StatusUdgivet - 2019

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