By Manuel Gessner
This thesis sheds new gentle at the interesting homes of composite quantum systems.
Quantum platforms of other sizes, starting from small bipartite structures to giant many-body ensembles, could be studied with assistance from glossy quantum optical experiments. those experiments give the opportunity to watch a large number of notable gains, together with nonclassical correlations, advanced dynamics and quantum part transitions. by means of adopting the complementary views of quantum info concept, quantum chemistry and many-body concept, the thesis develops new equipment for the effective characterization and outline of interacting, composite quantum systems.
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Extra info for Dynamics and Characterization of Composite Quantum Systems
One attempt to overcome this issue consists in the fabrication of arrays of segmented micro-traps (Wineland et al. 1998; Cirac and Zoller 2000; Kielpinski et al. 2002). The quantum gates are then performed in a fixed area, into which only a small number of ions is moved physically from an array of registers (Rowe et al. 2002; Walther et al. 2012). These micro-traps are fabricated in two-dimensional surface architectures on chips, using micro-electromechanical tools and nanotechnology. Surface traps, however, bring new problems as the ions have to be close to the surface for fast gate times and thereby become subject to electric-field noise due to surface impurities caused by atomic adhesion.
The transitions induced by the first red (blue) sideband are represented by red (blue) arrows in Fig. 4a. The effective Rabi frequencies for first-order sideband Rabi oscillations are proportional to the Lamb-Dicke parameter η. 1) these transitions are subject to weaker coupling than the carrier transition, leading to slower Rabi oscillations at constant laser intensity, as can be seen in Fig. 4c, d. 3 Controllable Quantum Systems (a) Electronic state 21 Motion Joint energy levels |e 729 nm |e, n − 1 ⊗ |g, n + 1 |g |g, n − 1 (b) |e, n + 1 |e, n Spectroscopy of resolved sidebands (c) |g, n Carrier Rabi oscillations |e |g (d) Blue sideband Rabi oscillations |e, 1 |g, 0 Fig.
2013). Beyond the initialization of the electronic ground state, the motional degree of freedom of the ions is typically cooled down as close as possible to the quantum mechanical ground state. The S1/2 -P1/2 transition is used for Doppler-cooling (Hänsch and Schawlow 1975): A red detuned laser at 397 nm is more likely to be absorbed by atoms moving towards the laser, since in this case the Doppler-shifted laser frequency is close to resonance in those atoms’ reference frame. When absorbing the photon, the recoil causes the atoms to slow down.
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