How to test the “quantumness” of a quantum computer?

Frontiers in Physics

Zagoskin, Alexandre M.¹  Grajcar, Miroslav²  Il'³  Betouras, Joseph J.³  ichev, Evgeni⁴ 

[1] Center for Emergent Matter Science, RIKEN, Saitama, Japan;Department of Experimental Physics, Comenius University, Bratislava, Slovakia;Department of Physics, Loughborough University, Loughborough, UK;Quantum Detection, Leibnitz Institute of Photonic Technology, Jena, Germany

关键词: Quantum computing;    adiabatic quantum computing;    Quantum coherence;    Quantum Annealing;    D-Wave Systems;    quantum simulations;    quantum speed-up;   

DOI  :  10.3389/fphy.2014.00033

学科分类：物理（综合）

来源: Frontiers

【 摘 要 】

Recent devices, using hundreds of superconducting quantum bits, claim to perform quantum computing. However, it is not an easy task to determine and quantify the degree of quantum coherence and control used by these devices. Namely, it is a difficult task to know with certainty whether or not a given device (e.g., the D-Wave One or D-Wave Two) is a quantum computer. Such a verification of quantum computing would be more accessible if we already had some kind of working quantum computer, to be able to compare the outputs of these various computing devices. Moreover, the verification process itself could strongly depend on whether the tested device is a standard (gate-based) or, e.g., an adiabatic quantum computer. Here we do not propose a technical solution to this quantum-computing “verification problem”, but rather outline the problem in a way which would help both specialists and non-experts to see the scale of this difficult task, and indicate some possible paths towards its solution.

【 授权许可】

CC BY