--- begin forwarded text Date: Sat, 02 Oct 1999 18:06:57 -0400 From: Somebody To: rah <[EMAIL PROTECTED]> Subject: [Fwd: Phys. Rev. Focus--1 OCT 1999] Bob -- More quantum cryptography - more-or-less incomprehensible... -- < Somebody's .sig> From: Focus List Owner <[EMAIL PROTECTED]> To: [EMAIL PROTECTED] Subject: Phys. Rev. Focus--1 OCT 1999 Sender: [EMAIL PROTECTED] Precedence: bulk Reply-To: [EMAIL PROTECTED] Precedence: list 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/) SCIENCE WRITERS AND JOURNALISTS: The American Institue of Physics has just launched a web site (http://www.aip.org/physnews/pnsentry.htm) containing full-text of new, notable journal articles. Write to [EMAIL PROTECTED] to register. Sorry, this site is for writers and journalists only. --- end forwarded text ----------------- Robert A. Hettinga <mailto: [EMAIL PROTECTED]> The Internet Bearer Underwriting Corporation <http://www.ibuc.com/> 44 Farquhar Street, Boston, MA 02131 USA "... however it may deserve respect for its usefulness and antiquity, [predicting the end of the world] has not been found agreeable to experience." -- Edward Gibbon, 'Decline and Fall of the Roman Empire'