Abstract
Implementations of quantum cryptography systems ideally require the generation of truly random numbers to randomly choose system transmission and detection parameters. Hence the availability of fast non-deterministic random bit generators is crucial for realising practical quantum cryptographic systems which can operate at high bit rates. Random physical phenomena such as quantum optical noise, thermal noise in resistors and frequency jitter of oscillators have been used as physical entropy sources for non-deterministic random bit generation. However, the bit rates of available non-deterministic generators have been limited to tens of megabits per second due to limitations of the mechanisms for extracting bits from physical noise. We have recently demonstrated that continuous streams of random bit sequences that pass standard statistical tests of randomness can be generated at fast rates of up to 1.7 Gbps (gigabits per second) by using two chaotic semiconductor lasers [1].
© 2009 IEEE
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