QUROPE Quantum Information Processing and Communication in Europe

Annual Conference of the Korean Physical Society,

Korea, 28 october-1 november 2013

Philippe Grangier (Institut d'Optique)

Quantum Optics and Quantum Information with Non-Gaussian States of Light

Conference on Quantum Information and Quantum Control,

12-16 August 2013, Toronto , Canada

Philippe Grangier (Institut d'Optique)

"Rydberg blockade for manipulating atomic and photonic qubits"

LPHYS, Nijni Novgorod, Russia,  29 July -  2 August 2013

Philippe Grangier (Institut d'Optique)

"Rydberg blockade for manipulating atomic and photonic qubits"

QIPC Florence, Italy,  1-5 July 2013

Philippe Grangier (Institut d'Optique)

"Rydberg blockade for manipulating atomic and photonic qubits"

Gordon research Conference on  Atomic Physics, 24-28 June 2013

Salve Regina University, Newport, USA

Philippe Grangier (Institut d'Optique)

"Manipulating Atoms and Photons using Rydberg Blockade"

The negatively charged nitrogen-vacancy (NV-) centre in diamond has many exciting applications in quantum nano-metrology, including magnetometry, electrometry, thermometry and piezometry. Indeed, it is possible for a single NV- centre to measure the complete three-dimensional vector of the local electric field or the position of a single fundamental charge in ambient conditions. However, in order to achieve such vector measurements, near complete knowledge of the orientation of the centre's defect structure is required.

Synthetic diamond production is a key to the development of quantum metrology and quantum information applications of diamond. The major quantum sensor and qubit candidate in diamond is the nitrogen-vacancy (NV) color center. This lattice defect comes in four different crystallographic orientations leading to an intrinsic inhomogeneity among NV centers, which is undesirable in some applications.

Rare-earth-doped crystals are excellent hardware for quantum storage of optical information. Additional functionality of these materials is added by their waveguiding properties allowing for on-chip photonic networks. However, detection and coherent properties of rare-earth single-spin qubits have not been demonstrated so far. Here, we present experimental results on high-fidelity optical initialization, effcient coherent manipulation, and optical readout of a single electron spin of Ce$^{3+}$ ion in a YAG crystal.

Error correction is important in classical and quantum computation. Decoherence caused by the inevitable interaction of quantum bits with their environment leads to dephasing or even relaxation. Correction of the concomitant errors is therefore a fundamental requirement for scalable quantum computation. Although algorithms for error correction have been known for some time, experimental realizations are scarce. Here we show quantum error correction in a heterogeneous, solid-state spin system.

We theoretically investigate the quantum statistical properties of light transmitted through an atomic medium with strong optical nonlinearity induced by Rydberg–Rydberg van der Waals interactions. In our setup, atoms are located in a cavity and nonresonantly driven on a two-photon transition from their ground state to a Rydberg level via an intermediate state by the combination of the weak signal field and a strong control beam.