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European Quantum Electronics Conference (EQEC)

Quantum information processing with atoms in microfabricated optical elements

Rainer Dumke, T. Müther, F. Scharnberg, Michael Volk, Wolfgang A. Ertmer, G. Birkl

Published Jan 1, 2003• 0 citations
Publisher

Abstract

Application of microoptical elements to quantum information processing with atoms and discussion of the inherent advantages and the potential of the new approach are presented. As one example, applicability of arrays of microfabricated lenses to create multiple far-detuned dipole traps for storing and manipulating qubits inscribed into atoms are experimentally investigated.

DOI
10.1109/eqec.2003.1314248

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Application of microoptical elements to quantum information processing with atoms and discussion of the inherent advantages and the potential of the new approach are presented. As one example, applicability of arrays of microfabricated lenses to create multiple far-detuned dipole traps for storing and manipulating qubits inscribed into atoms are experimentally investigated.
We discuss a new direction in the field of quantum information processing with neutral atoms. It is based on the use of microfabricated optical elements. With these elements versatile and integrated atom optical devices can be created in a compact fashion. This approach opens the possibility to scale, parallelize, and miniaturize atom optics for new investigations in fundamental research and applications towards quantum computing with neutral atoms. The exploitation of the unique features of the quantum mechanical behavior of matter waves and the capabilities of powerful state-of-the-art micro- and nanofabrication techniques lend this approach a special attraction.
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Summary form only given. The realization of miniaturized and integrated atom-optical elements at surfaces is of interest for many applications ranging from precision measurements to quantum information processing. So far, experimental work has been restricted to magnetic potentials above microfabricated current-carrying wires. Our present work now explores the case of optical potentials and some of its possibilities, including novel integrated atom optical elements such as a continuous atom source, a local atom detector and a quasi-1D surface lattice. In order to realize a continuous atom source for our experiments argon atoms from a slow atomic beam are collected and cooled in a magneto-optical surface trap.
We experimentally demonstrate novel structures for the realization of registers of atomic qubits: We trap neutral atoms in one- and two-dimensional arrays of far-detuned dipole traps obtained by focusing a red-detuned laser beam with a microfabricated array of microlenses. We are able to selectively address individual trap sites due to their large lateral separation of 125 microm. We initialize and read out different internal states for the individual sites. We also create two interleaved sets of trap arrays with adjustable separation, as required for many proposed implementations of quantum gate operations.