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Issue 33, 2018

Dipolar exchange quantum logic gate with polar molecules

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Abstract

We propose a two-qubit gate based on dipolar exchange interactions between individually addressable ultracold polar molecules in an array of optical dipole traps. Our proposal treats the full Hamiltonian of the 1Σ+ molecule NaCs, utilizing a pair of nuclear spin states as storage qubits. A third rotationally excited state with rotation-hyperfine coupling enables switchable electric dipolar exchange interactions between two molecules to generate an iSWAP gate. All three states are insensitive to external magnetic and electric fields. Impacts on gate fidelity due to coupling to other molecular states, imperfect ground-state cooling, blackbody radiation and vacuum spontaneous emission are small, leading to potential fidelity above 99.99% in a coherent quantum system that can be scaled by purely optical means.

Graphical abstract: Dipolar exchange quantum logic gate with polar molecules

Article information


Submitted
30 May 2018
Accepted
12 Jul 2018
First published
13 Jul 2018

This article is Open Access
All publication charges for this article have been paid for by the Royal Society of Chemistry

Chem. Sci., 2018,9, 6830-6838
Article type
Edge Article

Dipolar exchange quantum logic gate with polar molecules

K. Ni, T. Rosenband and D. D. Grimes, Chem. Sci., 2018, 9, 6830 DOI: 10.1039/C8SC02355G

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