National Physical Laboratory, Hampton Road, Teddington, TW11 0LW, UK.
Laboratoire de Physique Theorique et Hautes Energies, CNRS UMR 7589, Universites Paris 6 et 7, Place Jussieu, 75252, Paris, France.
Nat Commun. 2018 Mar 20;9(1):1143. doi: 10.1038/s41467-018-03577-2.
Noise and decoherence due to spurious two-level systems located at material interfaces are long-standing issues for solid-state quantum devices. Efforts to mitigate the effects of two-level systems have been hampered by a lack of knowledge about their chemical and physical nature. Here, by combining dielectric loss, frequency noise and on-chip electron spin resonance measurements in superconducting resonators, we demonstrate that desorption of surface spins is accompanied by an almost tenfold reduction in the charge-induced frequency noise in the resonators. These measurements provide experimental evidence that simultaneously reveals the chemical signatures of adsorbed magnetic moments and highlights their role in generating charge noise in solid-state quantum devices.
由于位于材料界面处的杂散两能级系统引起的噪声和退相干一直是固态量子器件的长期问题。由于对两能级系统的化学和物理性质缺乏了解，减轻两能级系统影响的努力受到了阻碍。在这里，我们通过在超导谐振器中结合介电损耗、频率噪声和片上电子自旋共振测量，证明了表面自旋解吸伴随着谐振器中电荷诱导频率噪声几乎降低十倍。这些测量提供了实验证据，同时揭示了吸附磁矩的化学特征，并强调了它们在固态量子器件中产生电荷噪声的作用。
