The Quantum Computer

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**What is a Quantum Computer?**

In a quantum computer, the fundamental unit of information (called a quantum bit or qubit), is not binary but rather more quaternary in nature.

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A qubit can exist not only in a state corresponding to the logical state 0 or 1 as in a classical bit, but also in states corresponding to a blend or superposition of these classical states. In other words, a qubit can exist as a zero, a one, or simultaneously as both 0 and 1, with a numerical coefficient representing the probability for each state.

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**The Potential and Power of Quantum Computing**

Early investigators in this field were naturally excited by the potential of such immense computing power, and soon after realizing its potential, the hunt was on to find something interesting for a quantum computer to do. Peter Shor, a research and computer scientist at AT&T’s Bell Laboratories in New Jersey, provided such an application by devising the first quantum computer algorithm. Shor’s algorithm harnesses the power of quantum superposition to rapidly factor very large numbers (on the order ~10200 digits and greater) in a matter of seconds. The premier application of a quantum computer capable of implementing this algorithm lies in the field of encryption, where one common (and best) encryption code, known as RSA, relies heavily on the difficulty of factoring very large composite numbers into their primes. A computer which can do this easily is naturally of great interest to numerous government agencies that use RSA — previously considered to be “uncrackable” — and anyone interested in electronic and financial privacy.

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source: http://www.cs.caltech.edu/~westside/quantum-intro.html

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Quantum computer가 나오면 기존의 암호화 알고리즘은 다 game over라는 거죠..

아마 양자 컴퓨터를 만든자가 세계를 지배하지 않을까… (맘만 먹으면)

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Quantum encryption inches closer to reality

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Researchers from Acadia Optronics working with the National Institute of Standards and Technology (NIST) said they have come up with a system that can transmit a stream of individual photons at a rate of 1 million bits a second. That’s about 100 times faster than comparable quantum encryption systems. At that rate, it becomes practical to send encrypted video or other protected material, according to NIST.

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source : http://news.com.com/2100-1029_3-5204725.html?tag=cd.top

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