# Quantum Computer and its Future

A **quantum computer** is a computation device that makes direct use of quantu-mechanical phenomena, such as superposition and entanglement, to perform operations on data.[1**] Quantum computers** are different from digital computers based on transistors. Whereas digital computers require data to be encoded into binary digits (bits}

each of which is always in one of two definite states (0 or 1), quantum

computation uses qubits (quantum bits), which can be in superpositions of

states. A theoretical model is the quantum Turing machine, also known as the

universal** quantum computer. Quantum computers** share theoretical similarities

with non-deterministic and probabilistic computers; one example is the ability

to be in more than one state simultaneously.The field of **quantum compute** was

first introduced by Yuri Manin in 1980[2] and Richard Feynman in 1982.[3][4] A

**quantum computer** with spins as quantum bits was also formulated for use as a **quantum**

space–time in 1969.[5]But the dreamers chasing this goal — a computer that uses quantum mechanics to

solve problems beyond the scope of classical computers, with unprecedented speed —

were jolted awake by a bucket of cold water Thursday, as research showed Canada’s

leading contribution to the field has so far failed to show its promise.

D-Wave Systems, a company in Burnaby, B.C.,whose shareholders include the

Canadian government, has sold devices it markets as** quantum computers** to theNational Aeronautics & Space Administration, Google and Lockheed Martin,

making it a major player in the predicted quantum revolution, rivalled only

by BlackBerry billionaire Mike Lazaridis, who has made the **quantum computer**

the key goal of his investment in Waterloo, Ont.’s “Quantum Valley.”But a paper by Swiss and American scientists in the leading journal

Science shows the D-Wave Two device does not calculate any faster than a classical computer.A **quantum computer** of just 30 qubits would exceed what classical computers can accurately model, and D-Wave’s device has more than 500. The problem is they last mere nanoseconds, decaying long before the computation is complete.

Handout/D-WaveD-Wave extolling some of the virtues of its quantum technology.

In this case, D-Wave’s qubits lasted about 10 nanoseconds, and the alculation

Prof. Troyer tested takes 20 microseconds — 2,000 times as long.Inside the Black Box The guts of a D-Wave don’t look like any other computer. Instead of metals

etched into silicon, the central processor is made of loops of the metal niobium,

surrounded by components designed to protect **quantum computer** from heat, vibration, and electromagnetic noise.

Isolate those niobium loops well enough from the outside world and you get a **quantum computer,**

thousands of times faster than the machine on your desk—or so the company claims. —Cameron Bird.For more details on the sequences of operations used for various quantum

algorithms, see universal **quantum compute**r, Shor’s algorithm, Grover’s algorithm, Deutsch-Jozsa algorithm, amplitude amplification, quantum Fourier transform, quantum gate, quantum adiabatic algorithm and quantum error correction.

The concept of a **quantum** **computer** relies on the weird and unique ability of inhabitants of the quantum world — from electrons and photons to non-abelian anyons — to be many things at once. An electron, for example, can spin both clockwise and counterclockwise simultaneously.

A photon can be polarized along two axes. The transistors that serve as ordinary bits can only be in one of two states (denoted 0 or 1), but qubits made from spinning electrons or polarized photons

are mixtures or “superpositions” of 0 and 1, existing in both states simultaneously.link:**The Future of Quantum Computing** Could Depend on This Tricky Qubit _ Science _ WIRED.htm

what can be done with light that has embeded code of 1,s & 0,s from god particles .the same code that was sent to space with a flash light . they received morse code with embeded code .i have that flash light. tell me what you think