1. A10 Designing spin-spin interactions in cold ion crystals
Rene Gerritsma, Ferdinand Schmidt-Kaler (Universität Mainz)
Spin-Spin interactions in ions
Emulating Solid State Physics
Effective quantum spin systems with
trapped Ions using light forces [1].
Quasiparticle engineering and
entanglement propagation [2].
Realization of a quantum integer-spin chain with controllable interaction [3].
Effective quantum spin systems using magnetic field gradient forces [4]
and oscillating field gradients [5,6].
Crystal of ions interacting with ultracold atoms: Quantum simulator of crystaline solids. [9,10]
Trap
potential
RF coupling
Magnetic
gradient
Fröhlich Hamiltonian:
Phonons
Fermions
Raman
laser beams
Fermion-phonon coupling
Infrastructural simplification
Integration into single device
Insensitive to imperfect cooling
Peierls instability:
Large spin-spin coupling
Versatile Raman light fields
[1] Porras and Cirac, PRL 92, (2004).
[2] Jurcevic , Lanyon, Hauke, Hempel, Zoller, Blatt and Roos, Nature 511, 202 (2014).
[3] Senko, Richerme, Smith, Lee, Cohen, Retzker and Monroe arXiv: (2014).
[4] Mintert and Wunderlich, PRL (2002).
[5] Ospelkaus, Langer, Amini, Brown, Leibfried, and Wineland, PRL 101, (2008).
[6] Ospelkaus, Warring, Colombe, Brown, Amini, Leibfried and Wineland, Nature 476, 181 (2011).
Zigzag crystals and
frustarted Spin interactions
[9] Bissbort, Cocks, Negretti, Idziaszek, Calarco, Schmidt-Kaler, Hofstetter and
Gerritsma PRL, 111, (2013).
[10] Negretti, Gerritsma, Idziaszek, Schmidt-Kaler and Calarco,
PRB, 90, (2014). A3 A5 A9
A12 B3
Hybrid microtrap
Ions emerged
in BEC
Critical anisotropy of trap frequencies leads to a structural transition of the crystal. Measurment of the eigenmodes shows deviation from pseudopotental approximation. Better agreement with Floquet-Lyapunov approach [7].
Effective coupling can be tuned by Laser parameters and trap anisotropy. Controlled sign-change allows study of frustration effects and phase diagrams. [8]
UHV system
Planar ion trap [11]
Micro-fabricated surface electrode segmented Paul trap.
Evaporated Ti/Au-layers (~330nm) on a fused silica substrate.
Electrode structure etched using a combination of laser weakening and HF-etching.
Trapping height: 100µm
Trapping frequency: ~1MHz
trap assembly B1 B2 B3 A3 A5
surface Mainz
[7] Kaufmann, Ulm, Jacob, Poschinger, Landa, Retzker, Plenio and Schmidt-Kaler, PRL 109, (2012).
[8] Bermudez, Almeida, Ott, Kaufmann, Ulm, Poschinger, Schmidt-Kaler, Retzker and Plenio, NJP (2012).
Kibble Zurek
Atomtrap and filterboard [12]
Magnetic z-wire trap (Imax = 20A)
External fields up to 30G.
Atomic trapping frequency > 1kHz  1D regime.
Au/AgPd-wires and electrodes printed on a Al2O3-Substrade using thick-film technology
Hybrid trap assembly
All parts ready for assemby in UHV
Laser systems for Rb and Yb+ ready
Magnetic
trap
Quench rate (a.u.)
[8] Ulm, Roßnagel, Jacob, Degünther, Dawkins, Poschinger, Nigmatullin, Retzker,
Plenio, Schmidt-Kaler, Singer, Nature Com. 4, 2290 (2013) B2 B3 A5 A9
[11] Quantum Information with Trapped Ions-group (UC Berkeley).
[12] Diplomathesis J.Joger ( A9
A12
Transregional Collaborative Research Centre SFB/TR 49
Frankfurt / Kaiserslautern / Mainz