Phys. Rev. Focus--1 OCT 1999

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From: Focus List Owner <owner-focus@8iCAdKjbUwrarFM4nUwAdS3AWjs6acnXzaE2_EjvycuE2pg_aoaVX0B1KoMSybSE_tRbjpe8xW4LcQ.yahoo.invalid>

PHYSICAL REVIEW FOCUS   1 OCT 1999   http://focus.aps.org/
from the American Physical Society

Introductions to the Focus stories of the past week;
visit http://focus.aps.org for the complete stories.

PHOTONS ON DEMAND
Laser physicists are good at producing and manipulating single
photons, but as with good comedy, the timing is important. Even the
best experiments in quantum cryptography and computing--applications
that make use of single photon properties--use sources that emit
photons at random times. In the 4 October PRL a French team
demonstrates a system that emits single photons on a dependable
schedule at a frequency of 3 MHz. One other "triggered" photon
source which operates on completely different principles was
reported earlier this year. With these new techniques, researchers
know exactly when and where a single photon will be found, and they
are a step closer to quantum applications, such as cryptography that
allows the receiver of information to deduce whether a message has
been intercepted.
(Brunel, Lounis, Tamarat, and Orrit, Phys. Rev. Lett. 83, 2722.
COMPLETE Focus story at http://focus.aps.org/v4/st17.html
Link to the paper: http://publish.aps.org/abstract/PRL/v83/p2722/)

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