Directed spontaneous emission from an extended ensemble of N atoms: timing is everything
A collection of N static atoms is fixed in a crystal at a low temperature and prepared by a pulse of incident radiation of wave vector k ->(0). The N atoms are well described by an entangled Dicke-like state, in which each atom carries a characteristic phase factor exp(ik ->(0)center dot r -&g...
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| Main Authors: | , , , |
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| Format: | Article |
| Published: |
2006
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| Subjects: | |
| Online Access: | http://eprints.um.edu.my/7934/ http://prl.aps.org/abstract/PRL/v96/i1/e010501 |
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| Institution: | Universiti Malaya |
| Summary: | A collection of N static atoms is fixed in a crystal at a low temperature and prepared by a pulse of incident radiation of wave vector k ->(0). The N atoms are well described by an entangled Dicke-like state, in which each atom carries a characteristic phase factor exp(ik ->(0)center dot r ->(j)), where r ->(j) is the atomic position in the crystal. It is shown that a single photon absorbed by the N atoms will be followed by spontaneous emission in the same direction. Furthermore, phase matched emission is found when one photon is absorbed by N atoms followed by two-photon down-conversion. |
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