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Journal of the Optical Society of America B

Optical Ferris wheels as a platform for collisional quantum gates

V. E. Lembessis, A. Lyras, Omar Marzook Al-Dossary

Published Nov 20, 2020• 15 citations
Publisher

Abstract

We show how optical Ferris wheel light fields can be exploited for the generation of internal-state-dependent optical lattices. We furthermore demonstrate how these lattices can be employed for the realization of controllable collisional gates. By employing realistic and experimentally accessible parameters, we demonstrate the potential of such gates, taking advantage of the extraordinary properties of optical Ferris wheels for efficient and scalable quantum computation.

DOI
10.1364/josab.405193

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We show how optical Ferris wheel light fields can be exploited for the generation of internal-state-dependent optical lattices. We furthermore demonstrate how these lattices can be employed for the realization of controllable collisional gates. By employing realistic and experimentally accessible parameters, we demonstrate the potential of such gates, taking advantage of the extraordinary properties of optical Ferris wheels for efficient and scalable quantum computation.
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The controlled creation of entanglement is one of the most challenging goals of modern quantum physics. Here we show how spin dependent optical lattice potentials together with controlled collisions between atoms in an optical lattice potential can be used to realize massively parallel operating quantum gates. In a second experiment, the generation of Bell states of atom pairs on single lattice sites is demonstrated by employing a newly found interstate Feshbach resonance in 87Rb. This Feshbach resonance has allowed us to efficiently modify the scattering length between two atoms in different spin states and is used to induce an entanglement dynamics in the system.
We present a complete architecture for scalable quantum computation with ultracold atoms in optical lattices using optical tweezers focused to the size of a lattice spacing. We discuss three different two-qubit gates based on local collisional interactions. The gates between arbitrary qubits require the transport of atoms to neighboring sites. We numerically optimize the nonadiabatic transport of the atoms through the lattice and the intensity ramps of the optical tweezer in order to maximize the gate fidelities. We find overall gate times of a few $100\phantom{\rule{0.28em}{0ex}}\ensuremath{\mu}$s, while keeping the error probability due to vibrational excitations and spontaneous scattering below ${10}^{\ensuremath{-}3}$. The requirements on the positioning error and intensity noise of the optical tweezer and the magnetic field stability are analyzed and we show that atoms in optical lattices could meet the requirements for fault-tolerant scalable quantum computing.
We consider the creation of artificial gauge magnetic and electric fields created when a two-level atom interacts with an optical Ferris wheel light field. These fields have the spatial structure of the optical Ferris wheel field intensity profile. It is shown, we believe for first time, that when this optical field pattern is made to rotate, then we have the creation of artificial electromagnetic fields that propagate in curved paths. The properties as well the limitations of these artificial electromagnetic fields are investigated and discussed.