D-Wave quantum computers

The world is growing with ever-advancing technology. Not far ago we heard of Supercomputer Tianhe-2 blazing at 33.4 petaflops. This time it is a Quantum computer.

D-Wave Systems Inc, the world’s first quantum computing company has recently announced that it has broken 1000 qubit barrier. A qubit is a two-state quantum-mechanical system, such as the polarization of a single photon. The two states are vertical polarization and horizontal polarization.

The new D-Wave computer has a processor of double the size of their previous model and has achieved the highest number of qubits ever. It runs a quantum annealing algorithm to find the lowest points, corresponding to optimal or near optimal solutions, in a virtual “energy landscape”. The qubits represent the search space of the processor. For eg: x qubits mean it will search for 2^x possibilities.

That means at 1000 qubits, the new processor considers 21000possibilities simultaneously and has a search space which dwarfs the 2512 possibilities available to the 512-qubit D-Wave Two. ‪In fact, the new search space contains far more possibilities than there are ‪particles in the observable universe.

The new processors inside D-Wave quantum computer are considered to be the most complex superconductor integrated circuits ever built.

Quantum computers’ computational prowess depends on the operating temperature, noise and the circuitry precision. The factors that impact problem solving of the processors’ efficiency are:

1. Lower Operating Temperature: Lower operating temperature increases the accuracy of the system. Previous generation processor ran at temperature close to absolute zero, the new processor runs 40% colder.

2. Reduced Noise: The new computer has the noise levels reduced by 50% in comparison to the previous generation. Lower noise boosts reliability and stability.

3. Increased Control Circuitry Precision: The increased precision coupled with the noise reduction has demonstrated improved precision by up to 40%..

4. Advanced Fabrication: The new processors comprise over 128,000 Josephson junctions (tunnel junctions with superconducting electrodes) in a 6-metal layer planar process with 0.25μm features.

The new and improved D-Wave Quantum Computers promise to solve some of the most challenging  scientific and national defense problems.

Also Read : IBM’s One Step Towards Making Quantum Computing A Reality

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source: D-Wave Systems