arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1707.09463quant-ph
收藏

量子计算机的缺陷

Defects in Quantum Computers

Bartłomiej Gardas, Jacek Dziarmaga, Wojciech H. Zurek, M. Zwolak

摘要:

从通用量子计算机到绝热量子计算或量子退火的兴趣转移需要广泛适用且易于实现的测试来评估量子或绝热如何成为特定硬件。在这里,我们提出了这样一个测试的基础上,一个完全可解的多体系统-在横向场的量子伊辛链-并实现它的D波机。理想的绝热淬火的量子伊辛链应导致一个有序的破缺对称基态与所有的自旋在同一方向上对齐。实际的失超可能由于退相干、噪声、所实现的哈密顿量中的缺陷而不完美,或者仅仅是太快而不能绝热。不完美会导致拓扑缺陷:自旋改变方向,扭结打断链的有序部分。这种缺陷的数量量化了量子计算机错过基态的程度,因此是不完美的。

英文摘要:

The shift of interest from general purpose quantum computers to adiabatic quantum computing or quantum annealing calls for a broadly applicable and easy to implement test to assess how quantum or adiabatic is a specific hardware. Here we propose such a test based on an exactly solvable many body system -- the quantum Ising chain in transverse field -- and implement it on the D-Wave machine. An ideal adiabatic quench of the quantum Ising chain should lead to an ordered broken symmetry ground state with all spins aligned in the same direction. An actual quench can be imperfect due to decoherence, noise, flaws in the implemented Hamiltonian, or simply too fast to be adiabatic. Imperfections result in topological defects: Spins change orientation, kinks punctuating ordered sections of the chain. The number of such defects quantifies the extent by which the quantum computer misses the ground state, and is, therefore, imperfect.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑