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Generating Optical Schrödinger Kittens for Quantum Information Processing
A detailed experimental analysis of a free-propagating light pulse prepared in a “Schrödinger kitten” state, which is defined as a quantum superposition of “classical” coherent states with small amplitudes, providing an essential tool for quantum information processing.
Mapping photonic entanglement into and out of a quantum memory
A protocol where entanglement between two atomic ensembles is created by coherent mapping of an entangled state of light by splitting a single photon and performing subsequent state transfer, which will allow ‘on-demand’Entanglement of atomic en assembles, a powerful resource for quantum information science.
Remote creation of hybrid entanglement between particle-like and wave-like optical qubits
Optical entanglement between a particle-like subsystem and a wave-like one is generated through the heralding detection of a single photon in an indistinguishable fashion at a central station. This…
Functional Quantum Nodes for Entanglement Distribution over Scalable Quantum Networks
The demonstrated quantum nodes and channels can be used as segments of a quantum repeater, providing an essential tool for robust long-distance quantum communication.
Heralded entanglement between atomic ensembles: preparation, decoherence, and scaling.
By way of the concurrence, quantitative characterizations are reported for the scaling behavior of entanglement with excitation probability and for the temporal dynamics of various correlations resulting in the decay of entangling.
Large Bragg Reflection from One-Dimensional Chains of Trapped Atoms Near a Nanoscale Waveguide.
Experimental observations of a large Bragg reflection from arrays of cold atoms trapped near a one-dimensional nanoscale waveguide are reported to enable novel quantum network capabilities and the study of many-body effects emerging from long-range interactions.
A quantum memory for orbital angular momentum photonic qubits
A quantum memory for orbital angular momentum qubits is demonstrated in the single-photon regime. It is based on cold cesium atoms and the dynamic electromagnetically induced transparency protocol.…
Storage and retrieval of vector beams of light in a multiple-degree-of-freedom quantum memory
- V. Parigi, V. D'ambrosio, C. Arnold, L. Marrucci, F. Sciarrino, J. Laurat
- PhysicsNature communications
- 13 April 2015
This work experimentally demonstrates the storage of spatio-polarization-patterned beams into an optical memory, and preservation of the phase and polarization singularities is demonstrated after retrieval, at the single-photon level.
Demonstration of a memory for tightly guided light in an optical nanofiber.
The experimental observation of slow-light and coherent storage in a setting where light is tightly confined in the transverse directions and subdiffraction-limited optical mode interacting with atoms via the strong evanescent field demonstrates an alternative to free-space focusing and a novel capability for information storage in an all-fibered quantum network.
Highly-efficient quantum memory for polarization qubits in a spatially-multiplexed cold atomic ensemble
This work reports on a quantum memory for polarization qubits that combines an average conditional fidelity above 99% and efficiency around 68%, thereby demonstrating a reversible qubit mapping where more information is retrieved than lost.