almost everyone agrees that universal quantum computers(like traditional computers, but super fast, high security) are very far away from us.
in the quantum timetable, the d-wave 2000q system is available on a quantum schedules.worth remembering moments.the system is a quantum computer based on quantum annealing.it is not a generic quantum computer, but it is really a quantum calculation.the question is, is that quantum computing really important? in other words, is the 2000q system really faster than traditional computers? a recent paper published in the physical review letters says that quantum annealing may not be faster than traditional calculations due to real-world temperature limits.tameem albash and colleagues from the university of southern california in los angeles conducted a thermodynamic analysis on a typical quantum hammer and found that such computers were severely constrained by operating temperatures.the paper argues that the working temperature required for such machines is so low that it is impossible to derive the optimal solution.quantum annealing is a computational model that utilizes the nature of quantum systems.
in general, it can solve the optimization problem.for a complex equation with many variables, how can we solve it and get the equation to the minimum? the particles are always randomly moved by quantum fluctuations and can try many different possible states very quickly.thus, these particles can be used to quickly solve the optimal value.
the quantum hammer is more like a quantum optimizer or a quantum solver than a computer in the usual sense.but it still conforms to the definition of a quantum computer.alba and colleagues want to know if that quantum computing is really useful?
they concluded that, with the expansion of the scale of the problem, quantum annealing chance encounter to trouble.assuming the temperature does not change, if more and more particles are added to the system, then the particles can"jump"or the fluctuation distance will become smaller.this means that the quantum annealing machine in the same time, can explore the scope of the solution is smaller, and thus lower efficiency.this analysis is consistent with the experimental results obtained on the d-wave computer and is consistent with previous studies that did not find"quantum acceleration"on the d-wave computer.
this does not necessarily mean that quantum annealing and d-wave are doomed to be tragic.
first of all, this argument has not yet settled.previous negative results did not prevent companies such as lockheed martin and volkswagen from buying d-wave quantum hammers.regardless of the quantum acceleration or not, they are fast-running computers, and help to use quantum algorithms to solve the problem.
al bash and colleagues wrote that their findings do not mean that quantum quantum annealing machine can not be accelerated, but with the expansion of the scale of the need to take more and more difficult to do this engineering program a little.at least, the question of d-wave is still reasonable.
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