Direct Dispersive Monitoring of Charge Parity in Offset-Charge-Sensitive Transmons

التفاصيل البيبلوغرافية
العنوان: Direct Dispersive Monitoring of Charge Parity in Offset-Charge-Sensitive Transmons
المؤلفون: Serniak, K., Diamond, S., Hays, M., Fatemi, V., Shankar, S., Frunzio, L., Schoelkopf, R. J., Devoret, M. H.
المصدر: Phys. Rev. Applied 12, 014052 (2019)
سنة النشر: 2019
المجموعة: Condensed Matter
Quantum Physics
مصطلحات موضوعية: Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Superconductivity, Quantum Physics
الوصف: A striking characteristic of superconducting circuits is that their eigenspectra and intermode coupling strengths are well predicted by simple Hamiltonians representing combinations of quantum circuit elements. Of particular interest is the Cooper-pair-box Hamiltonian used to describe the eigenspectra of transmon qubits, which can depend strongly on the offset-charge difference across the Josephson element. Notably, this offset-charge dependence can also be observed in the dispersive coupling between an ancillary readout mode and a transmon fabricated in the offset-charge-sensitive (OCS) regime. We utilize this effect to achieve direct, high-fidelity dispersive readout of the joint plasmon and charge-parity state of an OCS transmon, which enables efficient detection of charge fluctuations and nonequilibrium-quasiparticle dynamics. Specifically, we show that additional high-frequency filtering can extend the charge-parity lifetime of our device by two orders of magnitude, resulting in a significantly improved energy relaxation time $T_1\sim200~\mu\mathrm{s}$.
Comment: 11 pages, 9 figures
نوع الوثيقة: Working Paper
DOI: 10.1103/PhysRevApplied.12.014052
URL الوصول: http://arxiv.org/abs/1903.00113
رقم الأكسشن: edsarx.1903.00113
قاعدة البيانات: arXiv
الوصف
DOI:10.1103/PhysRevApplied.12.014052