We report the experimental realization of a single-atom heat engine. An ion is confined in linear Paul trap with tapered geometry and driven thermally by coupling it alternately to hot cold reservoirs. The output power engine used drive harmonic oscillation. From direct measurements dynamics, we determine thermodynamic cycles for various temperature differences use these evaluate $P$ efficiency $\eta$ engine, obtaining up $P=342\,$yJ $\eta=0.28 \,\%$, consistent analytical estimations. Our...

We consider a quantum Otto cycle for time-dependent harmonic oscillator coupled to squeezed thermal reservoir. show that the efficiency at maximum power increases with degree of squeezing, surpassing standard Carnot limit and approaching unity exponentially large squeezing parameters. further propose an experimental scheme implement such model system by using single trapped ion in linear Paul trap special geometry. Our analytical investigations are supported Monte Carlo simulations...

We propose an experimental scheme to realize a nano heat engine with single ion. An Otto cycle may be implemented by confining the ion in linear Paul trap tapered geometry and coupling it engineered laser reservoirs. The quantum efficiency at maximum power is analytically determined various regimes. Moreover, Monte Carlo simulations of are performed that demonstrate its feasibility ability operate 30% under realistic conditions.

We report on the observation of ultralong range interactions in a gas cold rubidium Rydberg atoms. The van der Waals interaction between pair atoms separated as far 100 000 Bohr radii features two important effects: spectral broadening resonance lines and suppression excitation with increasing density. density dependence these effects is investigated detail for $S$- $P$-Rydberg states principal quantum numbers $\mathsf{n}\ensuremath{\sim}60$ $\mathsf{n}\ensuremath{\sim}80$ excited by...

We realize fast transport of ions in a segmented micro-structured Paul trap. The ion is shuttled over distance more than 10^4 times its groundstate wavefunction size during only 5 motional cycles the trap (280 micro meter 3.6 seconds). Starting from ground-state-cooled ion, we find an optimized such that energy increase as low 0.10 $\pm$ 0.01 quanta. In addition, demonstrate quantum information stored spin-motion entangled state preserved throughout transport. Shuttling operations are...

We have calculated the long-range interaction potential curves of highly excited Rydberg atom pairs for combinations Li–Li, Na–Na, K–K, Rb–Rb and Cs–Cs in a perturbative approach. The dispersion C-coefficients are determined all symmetries molecular states that correlate to ns–ns, np–np nd–nd asymptotes. Fitted parameters given scaling as function principal quantum number n homonuclear alkali metal atoms.

Trapped laser-cooled atoms and ions are quantum systems which can be experimentally controlled with an as yet unmatched degree of precision. Due to the control motion internal degrees freedom, these adequately described by a well-known Hamiltonian. In this colloquium, powerful numerical tools for optimization external motional states trapped neutral atoms, explicitly applied case in segmented ion-trap presented. Inverse problems when optimizing trapping potentials ions, solved. The...

We simultaneously trap ultracold lithium and cesium atoms in an optical dipole formed by the focus of a CO2 laser study exchange thermal energy between gases. The optically cooled gas efficiently decreases temperature through sympathetic cooling. Equilibrium temperatures down to 25 microK have been reached. measured cross section for thermalizing 133Cs-7Li collisions is 8 x 10(-12) cm(2), both species unpolarized their lowest hyperfine ground state. Besides thermalization, we observe...

Single dopant atoms or dopant-related defect centers in a solid state matrix provide an attractive platform for quantum simulation of topological states, computing and communication, due to their potential realize scalable architecture compatible with electronic photonic integrated circuits. The production such devices calls deterministic single atom doping techniques because conventional stochastic are cannot deliver appropriate architectures. Here, we present the fabrication arrays...

We realize a single particle microscope by using deterministically extracted laser-cooled Ca+40 ions from Paul trap as probe particles for transmission imaging. demonstrate focusing of the to spot size 5.8±1.0 nm and minimum two-sample deviation beam position 1.5 in focal plane. The deterministic source, even when used combination with an imperfect detector, gives rise fivefold increase signal-to-noise ratio compared conventional Poissonian sources. Gating detector signal extraction event...

We describe the construction and operation of a segmented linear Paul trap, fabricated in printed-circuit-board technology with an electrode segment width 500 μm. prove applicability this to reliable ion trapping report observation Doppler-cooled crystals 40Ca+ kind trap. Measured trap frequencies agree numerical simulations at level few percent from which we infer high fabrication accuracy To demonstrate its usefulness versatility for trapped experiments study fast transport single ion. Our...

Single ions held in linear Paul traps are promising candidates for a future quantum computer. Here, we discuss two-layer microstructured segmented ion trap. The radial and axial potentials obtained from numeric field simulations the geometry of trap is optimized. As electrodes direction, allows transport between different spatial regions. Starting with realistic numerically potentials, optimize an such that motional degrees freedom not excited, even though speed far exceeds adiabatic regime....

The major challenges to fabricate quantum processors and future nano-solid-state devices are material modification techniques with nanometer resolution suppression of statistical fluctuations dopants or qubit carriers. Based on a segmented ion trap mK laser-cooled ions we have realized deterministic single-ion source which could operate huge range sympathetically cooled species, isotopes ionic molecules. We deterministically extracted predetermined number demand measured longitudinal...

We present a novel system for the simulation of quantum phase transitions collective internal qubit and phononic states with linear crystal trapped ions. The laser-ion interaction creates an energy gap in excitation spectrum, which induces effective phonon-phonon repulsion Jaynes-Cummings-Hubbard interaction. This shows features equivalent to polaritons coupled cavity arrays. Trapped ions allow easy tunabilty hopping frequency by adjusting axial trapping frequency, via laser detuning...

We present schemes to prepare two-dimensional cluster states [H. J. Briegel and R. Raussendorf, Phys. Rev. Lett. 86, 910 (2001)] with atomic ions confined in a microstructured linear ion trap coupled by an engineered spin-spin interaction. In particular, we show how $n\ifmmode\times\else\texttimes\fi{}2$ state creating adding third-neighbor entanglement using selective recoupling techniques. The scheme is based on the capabilities provided segmented Paul traps confine local potential wells...

The accurate transport of an ion over macroscopic distances represents a challenging control problem due to the different length and time scales that enter experimental limitations on controls need be accounted for. Here, we investigate performance techniques for in state-of-the-art segmented miniaturized traps. We employ numerical optimization classical trajectories quantum wavepacket propagation as well analytical solutions derived from invariant based inverse engineering geometric optimal...

We demonstrate the implementation of a spin qubit with single Ca ion in micro trap. The is encoded Zeeman ground state levels mJ=+1/2 and mJ=-1/2 S1/2 ion. show sideband cooling close to vibrational initialization readout 99.5% efficiency. employ Raman transition - P1/2 resonance for coherent manipulation qubit. observe rotations 96% fidelity gate times below 5mus. Rabi oscillations on blue motional are used extract phonon number distribution. dynamics this distribution analyzed deduce...

We use a single ion as movable electric field sensor with accuracies on the order of few V/m. For this, we compensate undesired static fields in planar radio frequency trap and characterize its curvature over an extended region along axis. observe strong buildup stray charges around loading resulting up to 1.3 kV/m at position. also find that profile remains constant time span months.

We observe the phase space trajectory of an entangled wave packet a trapped ion with high precision. The application spin-dependent light force on superposition spin states allows for coherent splitting matter such that two distinct components in emerge. motion precision better than 9% extension both momentum and position, corresponding to 0.8 nm position resolution. accurately study effect initial temperature quantum entanglement dynamics. Furthermore, we map out phonon distributions...

Abstract We introduce quantum sensing schemes for measuring very weak forces with a single trapped ion. They use the spin-motional coupling induced by laser-ion interaction to transfer relevant force information spin-degree of freedom. Therefore, estimation is carried out simply observing Ramsey-type oscillations ion spin states. Three probes are considered, which represented systems obeying Jaynes-Cummings, Rabi (in 1D) and Jahn-Teller 2D) models. By using dynamical decoupling in...