Quantum State Transfer between Matter and Light

We report on the coherent quantum state transfer from a two-level atomic system to a single photon. Entanglement between a single photon (signal) and a two-component ensemble of cold rubidium atoms is used to project the quantum memory element (the atomic ensemble) onto any desired state by measurin...

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Bibliographic Details
Published in:Science (American Association for the Advancement of Science) 2004-10, Vol.306 (5696), p.663-666
Main Authors: Matsukevich, D. N., Kuzmich, A.
Format: Article
Language:English
Subjects:
Atoms
Atoms & subatomic particles
Coincidence
Communication (Thought Transfer)
Conditional probabilities
Correlations
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Information Processing
Ions
Light
Matter & antimatter
Memory
Nonclassical field states
squeezed, antibunched and sub-poissonian states
operational definitions of the phase of the field
phase measurements
Optics
Photons
Physics
Propagation delay
Quantum computing
Quantum entanglement
Quantum optics
Quantum states
Signal detection
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Summary:We report on the coherent quantum state transfer from a two-level atomic system to a single photon. Entanglement between a single photon (signal) and a two-component ensemble of cold rubidium atoms is used to project the quantum memory element (the atomic ensemble) onto any desired state by measuring the signal in a suitable basis. The atomic qubit is read out by stimulating directional emission of a single photon (idler) from the (entangled) collective state of the ensemble. Faithful atomic memory preparation and readout are verified by the observed correlations between the signal and the idler photons. These results enable implementation of distributed quantum networking.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.1103346