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.
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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.
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source: D-Wave Systems