Transmitting Data Faster and Safer Online
Every savvy Internet user understands that security is a top priority when sending information online.
Professor Michael Vasilyev is doing his part to help make the Web safer by increasing by tenfold both the amount of information that can be securely transmitted and the distance it can travel. His research is part of an $8 million project funded by the Defense Advanced Research Project Agency and led by Northwestern University to study advanced quantum communication.
鈥�There are all kinds of personal information鈥攂oth among private citizens and public governments鈥攖hat require the utmost security,鈥� Dr. Vasilyev says. 鈥淨uantum communication offers the most rigorous solution for security because it employs the fundamental laws of quantum mechanics to enforce the exclusive link between the sender and receiver, with no chance of other people eavesdropping.鈥�
Classical communication methods transmit information by 鈥渂its鈥� that take values of either 1 or 0. In contrast, quantum communication uses quantum bits, or 鈥渜ubits,鈥� which can be 1, 0, or 1 and 0 simultaneously.
Current fast and secure quantum communications can only be sent short distances before the signal breaks down, because qubits can鈥檛 go through optical amplifiers鈥攃ommonly used in classical communications鈥攚ithout losing their quantum-mechanical security advantages. So Vasilyev鈥檚 lab is encoding the information in spatial features or pixels of the photons that will be sent through multimode fiber-optic lines, thus dramatically increasing the amount of received data without jeopardizing security.
Project participants include the University of California, Davis; University of Calgary; Montana State University; Raytheon BBN Technologies; Advanced Communication Sciences; and NuCrypt LLC.