arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0807.0354quant-ph
收藏

绝热量子计算中启发式猜想的研究

A study of heuristic guesses for adiabatic quantum computation

Alejandro Perdomo, Salvador E. Venegas-Andraca, Alán Aspuru-Guzik

摘要:

绝热量子计算(AQC)是量子计算的通用模型,它试图将量子系统的初始基态转换为最终基态,编码计算问题的答案。AQC初始哈密顿量通常具有作为基态的均匀叠加。我们通过引入一种简单形式的量子力学来偏离这种做法:能够以一种对问题解的猜测的状态开始量子演化。考虑到这一目标,我们解释了这种方法的可行性和所需的修改,传统的AQC(CAQC)算法。通过对难以满足的6位和7位随机实例的可满足性问题(3-SAT)进行数值研究,我们展示了这种启发式方法是如何可能的,并且我们确定所提出的特定算法的性能在很大程度上取决于所选择的初始猜测状态相对于解决方案的汉明距离。除了引入有根据的猜测作为初始状态的可能性之外,新的策略允许从测量的激发态重新启动失败的绝热过程的可能性,而不是像CAQC那样从状态的完全叠加重新启动。测量的结果可以用作更精确的猜测状态,以重新开始绝热演化。这个串联的重新启动过程是CAQC策略无法捕获的另一个启发式方法。

英文摘要:

Adiabatic quantum computation (AQC) is a universal model for quantum computation which seeks to transform the initial ground state of a quantum system into a final ground state encoding the answer to a computational problem. AQC initial Hamiltonians conventionally have a uniform superposition as ground state. We diverge from this practice by introducing a simple form of heuristics: the ability to start the quantum evolution with a state which is a guess to the solution of the problem. With this goal in mind, we explain the viability of this approach and the needed modifications to the conventional AQC (CAQC) algorithm. By performing a numerical study on hard-to-satisfy 6 and 7 bit random instances of the satisfiability problem (3-SAT), we show how this heuristic approach is possible and we identify that the performance of the particular algorithm proposed is largely determined by the Hamming distance of the chosen initial guess state with respect to the solution. Besides the possibility of introducing educated guesses as initial states, the new strategy allows for the possibility of restarting a failed adiabatic process from the measured excited state as opposed to restarting from the full superposition of states as in CAQC. The outcome of the measurement can be used as a more refined guess state to restart the adiabatic evolution. This concatenated restart process is another heuristic that the CAQC strategy cannot capture.

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。

↑