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Nature 452, 37-38 (6 March 2008) | doi:10.1038/452037a; Published online 5 March 2008
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John Innes Centre Project Leader in Plant or Microbial Sciences
- University of East Anglia
- Norwich, NR4 7TJ, UK
Assistant Professor in the Study of Physical Hazards
- University of Cincinnati
- Cincinnati, Ohio, USA
Quantum physics: Tangled memories
Lene Vestergaard Hau1
Abstract
The latest quantum trick — mapping two entangled photon states onto two separate regions of an atomic cloud, and then retrieving them — could be a fillip for applications, among them quantum cryptography.
On page 67 of this issue, Choi et al.1 recount how they store two 'entangled' photon states in a memory consisting of a cloud of cold atoms, and then, after a certain delay, retrieve those self-same states from the cloud. The optical modes are stored in spatially separated regions of a single atom cloud, but there is no reason why the technique should not be used to imprint the same quantum states on two distinct atom clouds separated by a macroscopic distance.
- Lene Vestergaard Hau is in the Lyman Laboratory, Physics Department, Harvard University, 17 Oxford Street, Cambridge, Massachusetts 02138, USA.
Email: hau@physics.harvard.edu
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