Minimizing the Discrimination Time for Quantum States of an Artificial Atom

I. Takmakov, P. Winkel, F. Foroughi, L. Planat, D. Gusenkova, M. Spiecker, D. Rieger, L. Grünhaupt, A. V. Ustinov, W. Wernsdorfer, I. Pop, N. Roch
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引用次数: 5

Abstract

Fast discrimination between quantum states of superconducting artificial atoms is an important ingredient for quantum information processing. In circuit quantum electrodynamics, increasing the signal field amplitude in the readout resonator, dispersively coupled to the artificial atom, improves the signal-to-noise ratio and increases the measurement strength. Here we employ this effect over two orders of magnitude in readout power, made possible by the unique combination of a dimer Josephson junction array amplifier with a large dynamic range, and the fact that the readout of our granular aluminum fluxonium artificial atom remained quantum-non-demolition (QND) at relatively large photon numbers in the readout resonator, up to $\overline{n} = 110$. Using Bayesian inference, this allows us to detect quantum jumps faster than the readout resonator response time $2/\kappa$, where $\kappa$ is the bandwidth of the readout resonator.
最小化人工原子量子态的识别时间
超导人工原子量子态的快速判别是量子信息处理的重要组成部分。在电路量子电动力学中,增大读出谐振腔中的信号场幅值,与人造原子色散耦合,提高了信噪比,增加了测量强度。在这里,我们在读出功率中使用了超过两个数量级的这种效应,这是由于具有大动态范围的二聚体约瑟夫森结阵列放大器的独特组合,以及我们的颗粒状铝氟化铵人工原子在读出谐振器中相对较大的光子数下保持量子不破坏(QND)的事实,高达$\overline{n} = 110$。使用贝叶斯推理,这允许我们检测比读出谐振器响应时间$2/\kappa$更快的量子跳变,其中$\kappa$是读出谐振器的带宽。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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