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Contact: Hendra.Nurdin@anu.edu.au SYSTEMS AND CONTROL SERIES
Building a Quantum Cryptographic Network with Bright Laser BeamsProf. Ping Koy Lam (The Australian National University)DATE: 2009-09-18 TIME: 11:00:00 - 12:00:00 LOCATION: RSISE Seminar Room, ground floor, building 115, cnr. North and Daley Roads, ANU ABSTRACT: Quantum information research aims to enhance information technology by exploiting quantum effects at the microscopy scale. Using bright laser beams, information can be optically encoded onto the sideband frequencies of a beam of light. For a continuous wave laser beam, this sideband technique is implicitly broadband and can allow multi-channel encoding. The encoded information, which can be a large "classical" signal or a weak few photon "quantum" signal, is always subjected to the quantum dynamics of the laser beam. In this talk, I will give a brief overview of the experimental quantum optics program at the Department of Quantum Science. I will then focus the discussion on a method of generating and distributing one-time-pad with bright laser beams. A working quantum key distribution system should have absolute communication security against eavesdropping. The communication security is guaranteed by the laws of physics instead of mathematical complexity. In our experiment, we succeeded in demonstrating the generation of a one-time-pad in a communication line with 90% loss. The protocol is based on a post-selection algorithm that differentially increases the shared information between the sender and the receiver. This system is currently being commercialized by an ANU spin-off company. In close partnership with various governmental agencies and departments, QuintessenceLabs aims to protect the information security of the parliamentary triangle with quantum cryptography.
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