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SUMMARY:How Much Energy Is Required to Send One Bit Reliably over the Pois
 son Channel with Feedback? - Prof Amos Lapidoth\, ETH Zurich
DTSTART:20110622T131500Z
DTEND:20110622T140000Z
UID:TALK31760@talks.cam.ac.uk
CONTACT:Rachel Fogg
DESCRIPTION:We study the transmission of a single bit over the continuous-
 time optical Poisson channel with noiseless feedback. We show that the ene
 rgy required to send the bit reliably is equal\, on the average\, to\nhalf
  the energy of a photon. We then consider sending one of M messages and sh
 ow that the required energy is (M-1)/M of the energy of a photon. With the
  energy of one photon we can thus send as many bits and we want reliably. 
 These results hold irrespective of the intensity of the dark current.\n\nI
 n discussing these results I shall highlight the difference between the co
 ncept of the "required energy per bit" and the "required energy to send a 
 single bit".\n\nI shall assume only a smidgen of Information Theory and on
 ly the basic properties of the Poisson and Exponential distributions.\n\nJ
 oint work with Shahab Asoodeh and Ligong Wang\n\n
LOCATION:LR4\, Engineering\, Department of
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