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Physics Letters A

Control of entanglement following the photoionization of trapped, hydrogen-like ions

Thomas Radtke, S. Fritzsche, A. Surzhykov

Published Jul 13, 2005• 7 citations
Publisher
DOI
10.1016/j.physleta.2005.06.106

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Hydrogen atoms seeded in a supersonic expansion of Kr have been decelerated from an initial velocity of 435 m s-1 to 107 m s-1 in a multistage Zeeman decelerator. The operation of the decelerator has been fully quantified by numerical particle trajectory simulations and independent measurements of the velocity distribution by ion time-of-flight mass spectrometry following photoionization of the decelerated atoms. The velocity distributions of the decelerated atom clouds have a half-width at half-maximum of 25 ± 12 m s-1 corresponding to a temperature of ∼30 mK. These velocities and temperatures are sufficiently low that magnetic trapping of the atoms can be envisaged. © 2008 IOP Publishing Ltd.
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We present a new method for the generation of rotationally and vibrationally state-selected, translationally cold molecular ions in ion traps. Our technique is based on the state-selective threshold photoionization of neutral molecules followed by sympathetic cooling of the resulting ions with laser-cooled calcium ions. Using N₂(+) ions as a test system, we achieve >90% selectivity in the preparation of the ground rovibrational level and state lifetimes on the order of 15 minutes limited by collisions with background-gas molecules. The technique can be employed to produce a wide range of apolar and polar molecular ions in the ground and excited rovibrational states. Our approach opens up new perspectives for cold quantum-controlled ion-molecule-collision studies, frequency-metrology experiments with state-selected molecular ions and molecular-ion qubits.