NUMBER GENERATOR

A quantum random number generator is a device that utilizes the

quantum phenomena to generate true random numbers. The

measurement outcome of the microscopic particles is inherently random, onesuch example is beam splitter scheme where we can

consider a photon sent to a beam splitter.

The probability of the photon to travel in transmitted path and reected path is same i.e. the photon remains in superposition of both the paths till it is detected in either one of the two detectors which are placed in the transmitted and reected path respectively and thus the outcome

is purely random.

A random number is a number generated which is unpredic

table, not

reproducible and unbiased. A random number can be produced by

either a software(de-terministic algorithm) or hardware (physical

process). A software generated random numbers are pseudo random

numbers because they can be reproduced after a period of time.

The physical random number generator (RNG) can be a classical

process which is deterministic or a quantum process which is

intrinsically random. The famous classical RNG which is coin tossing can

be pre

dicted if initial conditions are known. Thus pseudo random

numbers are reproducible and classical RNG are essentially complex

but yet deterministic. Genuine randomness is possible only by a

Quantum random number generator which is based on the

quantumness of microscopic system.

At present commercial QRNG are there in market for example qStream

of Quin

tessencelabs which can produce 1Gbit/s and QUANTIS

manufactured by IDQuantique can produce 16Mbits/s.

A quantum random number is an important resource and has many

demanding applications viz gaming industry, cryptography, statistical research, simulation, deterministic RNG seeding.