11 research outputs found
Efficient Teleportation between Remote Single-Atom Quantum Memories
We demonstrate teleportation of quantum bits between two single atoms in
distant laboratories. Using a time-resolved photonic Bell-state measurement, we
achieve a teleportation fidelity of (88.0+/-1.5)%, largely determined by our
entanglement fidelity. The low photon collection efficiency in free space is
overcome by trapping each atom in an optical cavity. The resulting success
probability of 0.1% is almost 5 orders of magnitude larger than in previous
experiments with remote material qubits. It is mainly limited by photon
propagation and detection losses and can be enhanced with a cavity-based
deterministic Bell-state measurement.Comment: 7 pages, 4 figures, 1 tabl
Increased Dimensionality of Raman Cooling in a Slightly Nonorthogonal Optical Lattice
We experimentally study the effect of a slight nonorthogonality in a
two-dimensional optical lattice onto resolved-sideband Raman cooling. We find
that when the trap frequencies of the two lattice directions are equal, the
trap frequencies of the combined potential exhibit an avoided crossing and the
corresponding eigenmodes are rotated by 45 degrees relative to the lattice
beams. Hence, tuning the trap frequencies makes it possible to rotate the
eigenmodes such that both eigenmodes have a large projection onto any desired
direction in the lattice plane, in particular, onto the direction along which
Raman cooling works. Using this, we achieve two-dimensional Raman ground-state
cooling in a geometry where this would be impossible, if the eigenmodes were
not rotated. Our experiment is performed with a single atom inside an optical
resonator but this is inessential and the scheme is expected to work equally
well in other situations
Breakdown of atomic hyperfine coupling in a deep optical-dipole trap
We experimentally study the breakdown of hyperfine coupling for an atom in a
deep optical-dipole trap. One-color laser spectroscopy is performed at the
resonance lines of a single Rb atom for a trap wavelength of 1064 nm.
Evidence of hyperfine breakdown comes from three observations, namely a
nonlinear dependence of the transition frequencies on the trap intensity, a
splitting of lines which are degenerate for small intensities, and the ability
to drive transitions which would be forbidden by selection rules in the absence
of hyperfine breakdown. From the data, we infer the hyperfine interval of the
state and the scalar and tensor polarizabilities for the
state
Generation of single photons from an atom-cavity system
A single rubidium atom trapped within a high-finesse optical cavity is an
efficient source of single photons. We theoretically and experimentally study
single-photon generation using a vacuum stimulated Raman adiabatic passage. We
experimentally achieve photon generation efficiencies of up to 34% and 56% on
the D1 and D2 line, respectively. Output coupling with 89% results in
record-high efficiencies for single photons in one spatiotemporally
well-defined propagating mode. We demonstrate that the observed generation
efficiencies are constant in a wide range of applied pump laser powers and
virtual level detunings. This allows for independent control over the frequency
and wave packet envelope of the photons without loss in efficiency. In
combination with the long trapping time of the atom in the cavity, our system
constitutes a significant advancement toward an on-demand, highly efficient
single-photon source for quantum information processing tasks.Comment: 7 pages, 5 figure
An Elementary Quantum Network of Single Atoms in Optical Cavities
Quantum networks are distributed quantum many-body systems with tailored
topology and controlled information exchange. They are the backbone of
distributed quantum computing architectures and quantum communication. Here we
present a prototype of such a quantum network based on single atoms embedded in
optical cavities. We show that atom-cavity systems form universal nodes capable
of sending, receiving, storing and releasing photonic quantum information.
Quantum connectivity between nodes is achieved in the conceptually most
fundamental way: by the coherent exchange of a single photon. We demonstrate
the faithful transfer of an atomic quantum state and the creation of
entanglement between two identical nodes in independent laboratories. The
created nonlocal state is manipulated by local qubit rotation. This efficient
cavity-based approach to quantum networking is particularly promising as it
offers a clear perspective for scalability, thus paving the way towards
large-scale quantum networks and their applications.Comment: 8 pages, 5 figure
Nurses' perceptions of aids and obstacles to the provision of optimal end of life care in ICU
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