Gardas Bartłomiej, Deffner Sebastian
Theoretical Division, LANL, Los Alamos, New Mexico, 87545, USA.
Institute of Physics, University of Silesia, 40-007, Katowice, Poland.
Sci Rep. 2018 Nov 21;8(1):17191. doi: 10.1038/s41598-018-35264-z.
Near term quantum hardware promises unprecedented computational advantage. Crucial in its development is the characterization and minimization of computational errors. We propose the use of the quantum fluctuation theorem to benchmark the accuracy of quantum annealers. This versatile tool provides simple means to determine whether the quantum dynamics are unital, unitary, and adiabatic, or whether the system is prone to thermal noise. Our proposal is experimentally tested on two generations of the D-Wave machine, which illustrates the sensitivity of the fluctuation theorem to the smallest aberrations from ideal annealing. In addition, for the optimally operating D-Wave machine, our experiment provides the first experimental verification of the integral fluctuation in an interacting, many-body quantum system.
近期的量子硬件有望带来前所未有的计算优势。其发展的关键在于计算误差的表征和最小化。我们提议使用量子涨落定理来衡量量子退火器的精度。这个通用工具提供了简单的方法来确定量子动力学是否是幺正的、酉的和绝热的，或者系统是否容易受到热噪声的影响。我们的提议在两代D-Wave机器上进行了实验测试，这说明了涨落定理对理想退火中最小偏差的敏感性。此外，对于最佳运行的D-Wave机器，我们的实验首次对相互作用的多体量子系统中的积分涨落进行了实验验证。
