Manipulation and coherence of ultra-cold atoms on a superconducting atom chip

Simon Bernon, Helge Hattermann, Daniel Bothner, Martin Knufinke, Patrizia Weiss, Florian Jessen, Daniel Cano, Matthias Kemmler, Reinhold Kleiner, Dieter Koelle and József Fortágh ()
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Simon Bernon: CQ Center for Collective Quantum Phenomena and their Applications in LISA+, Physikalisches Institut, Eberhard-Karls-Universität Tübingen
Helge Hattermann: CQ Center for Collective Quantum Phenomena and their Applications in LISA+, Physikalisches Institut, Eberhard-Karls-Universität Tübingen
Daniel Bothner: CQ Center for Collective Quantum Phenomena and their Applications in LISA+, Physikalisches Institut, Eberhard-Karls-Universität Tübingen
Martin Knufinke: CQ Center for Collective Quantum Phenomena and their Applications in LISA+, Physikalisches Institut, Eberhard-Karls-Universität Tübingen
Patrizia Weiss: CQ Center for Collective Quantum Phenomena and their Applications in LISA+, Physikalisches Institut, Eberhard-Karls-Universität Tübingen
Florian Jessen: CQ Center for Collective Quantum Phenomena and their Applications in LISA+, Physikalisches Institut, Eberhard-Karls-Universität Tübingen
Daniel Cano: CQ Center for Collective Quantum Phenomena and their Applications in LISA+, Physikalisches Institut, Eberhard-Karls-Universität Tübingen
Matthias Kemmler: CQ Center for Collective Quantum Phenomena and their Applications in LISA+, Physikalisches Institut, Eberhard-Karls-Universität Tübingen
Reinhold Kleiner: CQ Center for Collective Quantum Phenomena and their Applications in LISA+, Physikalisches Institut, Eberhard-Karls-Universität Tübingen
Dieter Koelle: CQ Center for Collective Quantum Phenomena and their Applications in LISA+, Physikalisches Institut, Eberhard-Karls-Universität Tübingen
József Fortágh: CQ Center for Collective Quantum Phenomena and their Applications in LISA+, Physikalisches Institut, Eberhard-Karls-Universität Tübingen

Nature Communications, 2013, vol. 4, issue 1, 1-8

Abstract: Abstract The coherence of quantum systems is crucial to quantum information processing. Although superconducting qubits can process quantum information at microelectronics rates, it remains a challenge to preserve the coherence and therefore the quantum character of the information in these systems. An alternative is to share the tasks between different quantum platforms, for example, cold atoms storing the quantum information processed by superconducting circuits. Here we characterize the coherence of superposition states of 87Rb atoms magnetically trapped on a superconducting atom chip. We load atoms into a persistent-current trap engineered next to a coplanar microwave resonator structure, and observe that the coherence of hyperfine ground states is preserved for several seconds. We show that large ensembles of a million of thermal atoms below 350 nK temperature and pure Bose–Einstein condensates with 3.5 × 105 atoms can be prepared and manipulated at the superconducting interface. This opens the path towards the rich dynamics of strong collective coupling regimes.

Date: 2013
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DOI: 10.1038/ncomms3380

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