1. School of Physics, Trinity College Dublin, College Green, Dublin 2, Ireland
2. School of Physics, University College Dublin, Belfield, Dublin 4, Ireland
3. Centre for Quantum Engineering, Science, and Technology, University College Dublin, Belfield, Dublin 4, Ireland
4. Dahlem Center for Complex Quantum Systems, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany
5. Department of Physics and Astronomy, University of Rochester, Rochester, New York 14627, USA