Publications
Photonic qubits, qutrits and ququads accurately prepared and delivered on demand
New Journal of Physics 15 (2013) 053007
Reliable encoding of information in quantum systems is crucial to all approaches to quantum information processing or communication. This applies in particular to photons used in linear optics quantum computing, which is scalable provided a deterministic single-photon emission and preparation is available. Here, we show that narrowband photons deterministically emitted from an atom–cavity system fulfil these requirements. Within their 500 ns coherence time, we demonstrate a subdivision into d time bins of various amplitudes and phases, which we use for encoding arbitrary qu-d-its. The latter is done deterministically with a fidelity >95% for qubits, verified using a newly developed time-resolved quantum-homodyne method.
Control and manipulation of cold atoms in optical tweezers
NEW JOURNAL OF PHYSICS 14 (2012) ARTN 073051
Spatial light modulators for the manipulation of individual atoms
APPLIED PHYSICS B-LASERS AND OPTICS 102 (2011) 443-450
Highly efficient source for indistinguishable single photons of controlled shape
NEW JOURNAL OF PHYSICS 13 (2011) ARTN 103036
Three Dimensional Raman Cooling using Velocity Selective Rapid Adiabatic Passage
Chapter in ,
We present a new and efficient implementation of Raman cooling of trapped atoms. It uses Raman pulses with an appropriate frequency chirp to realize a velocity selective excitation through a rapid adiabatic passage. This method allows to address in a single pulse a large number of non zero atomic velocity classes and it produces a nearly unity transfer efficiency. We demonstrate this cooling method using cesium atoms in a far-detuned crossed dipole trap. Three-dimensional cooling of $1 \times 10^{5}$ atoms down to $2 \mu$K is performed in 100 ms. In this preliminary experiment the final atomic density is $1.3\times 10^{12}$ at/cm$^3$ (within a factor of 2) and the phase-space density increase over the uncooled sample is 20. Numerical simulations indicate that temperatures below the single photon recoil temperature should be achievable with this method.
EIT-based quantum memory for single photons from cavity-QED
APPLIED PHYSICS B-LASERS AND OPTICS 103 (2011) 579-589
Cavity-based single-photon sources
CONTEMPORARY PHYSICS 51 (2010) 289-313
Optimum pulse shapes for stimulated Raman adiabatic passage
PHYSICAL REVIEW A 80 (2009) ARTN 013417
Polarization-controlled single photons
PHYSICAL REVIEW LETTERS 98 (2007) ARTN 063601
A single-photon server with just one atom
NATURE PHYSICS 3 (2007) 253-255
Single-atom single-photon quantum interface
SCIENCE 317 (2007) 488-490
Scheme for generating a sequence of single photons of alternating polarization
JOURNAL OF MODERN OPTICS 54 (2007) 1569-1580
Three-dimensional cavity cooling and trapping in an optical lattice
PHYSICAL REVIEW A 73 (2006) ARTN 063415
Time-resolved and state-selective detection of single freely falling atoms
OPTICS COMMUNICATIONS 264 (2006) 271-277
