Cold Polar Molecules and their Applications for Quantum Information H.P. Büchler
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1 Cold Polar Molecules and their Applications for Quantum Information H.P. Büchler Theoretische Physik III, Universität Stuttgart, Germany
2 Outline Introduction to polar molecules - quantum melting transition between a crystal of and a superfluid Spin toolbox - polar molecules with spin - realization of Kitaev model - three-body interactions AMO- solid state interface - solid state quantum processor - molecular quantum memory
3 Polar molecules Why hetronuclear polar molecules? - coupling to optical and microwave fields - trapping/cooling - internal states - permanent dipole moment - strong dipole-dipole interaction - long-range interaction dipole moment
4 Polar molecules Hetronuclear Molecules - electronic excitations - vibrational excitations - rotational excitations (microwave fields) electronic levels - electron spin - nuclear spin vibrational levels vibrational levels dipole moment rotational and vibrational ground state
5 Polar molecule Rydberg-Klein-Rees (RKR)-potentials (R. Skelton et al., 2003) heteronuclear molecule with strong persistent dipole moment in electronic groundstate. Sr 2+ O 2... ionic binding Sr 2+ O 2 X 1 Σ +... electronic groundstate: S=0... closed shell (..9σ 2 10σ 2 4π 4 ) r eq = Ǻ... equilibrium distance d = D... dipole-moment r eq = Ǻ d = 8.9 D ω eq = THz... vibrational const. B eq = GHz... rotational I=0... no nuclear momenta for 88 SrO, 86 SrO
6 Polar molecules Polar molecules in the electronic, vibrational, and rotational ground state - permanent dipole moment: dipole moment - polarizable with static electric field, and microwave fields Strong dipole-dipole interactions tunable with external fields - interactions are increased by compared to magnetic dipole interactions
7 Polar molecules Experimental status Raman laser / spontaneous emission - Polar molecules in the rotational and vibrational ground state - cooling and trapping techniques beeing developement: - cooling of polar molecules: D. De Mille, Yale J. Doyle, Harvard G. Rempe, Munich G. Meijer, Berlin J. Ye, JILA - photo association (all cold atom labs) rotational and vibrational ground state - hetronuclear molecules, e.g., SrO, RbCs, LiCs, Sr F
8 Polar molecule Low energy description rotation of the molecule - rigid rotor in an electric field : angular momentum : dipole operator dipole moment Accessible via microwave - anharmonic spectrum - electric dipole transition - microwave transition frequencies - no spontaneous emission
9 Polar molecule Dipole matrix elements - basis states - dipole operator: - matrix elements Clebsch Gordan coefficient Static electric field - internal Hamilton - finite averaged dipole moment
10 Polar molecules with spin CaF Polar molecule - electronic spin spin along molecular axes - nuclear spin rigid rotor spinrotation hyperfine
11 Interaction between polar molecules Hamiltonian kinetic energy trapping potential rigid rotor electric field interaction potential Without external drive - van der Waals attraction Static electric field - internal Hamilton - finite averaged dipole moment
12 Dipole-dipole interaction Dipole-dipole interaction - anisotropic interaction - long-range attraction repulsion Weak Dipole-dipole interaction - short-range interaction: - pseudo-potential - s-wave scattering length - long range part via dipole-dipole interaction
13 Dipole-dipole interaction Dipole-dipole interaction - anisotropic interaction - long-range attraction repulsion attraction Instability in the many-body system Stability: confining potential - collaps of the system for increasing dipole interaction (Pfau 07) - roton softening - supersolids? (Goral et. al. 02, L. Santos et al. 03, Shlyapnikov 06) - strong interactions - confining into 2D by an optical lattice oscillator wavefunction
14 Stability via transverse confining Effective interaction - interaction potential with transverse trapping potential - characteristic length scale - potential barrier: larger than kinetic energy Tunneling rate: - semi-classical rate (instanton techniques) attempt frequency kinetic energies - Euclidean action of the instanton trajectory numerical factor: bound states
15 Crystalline phase
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