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Thermal and Residual Excited-State Population in a 3D Transmon Qubit
X. Y. Jin, A. Kamal, A. P. Sears +9
We present a systematic study of the first excited-state population in a 3D transmon qubit mounted in a dilution refrigerator with a variable temperature. Using a modified version…
Coherence and Decay of Higher Energy Levels of a Superconducting Transmon Qubit
Michael J. Peterer, Samuel J. Bader, Xiaoyue Jin +7
We present measurements of coherence and successive decay dynamics of higher energy levels of a superconducting transmon qubit. By applying consecutive -pulses for each sequenti…
Fabrication Process and Properties of Fully-Planarized Deep-Submicron Nb/Al-AlOx/Nb Josephson Junctions for VLSI Circuits
Sergey K. Tolpygo, Vladimir Bolkhovsky, Terence J. Weir +3
A fabrication process for Nb/Al-AlOx/Nb Josephson junctions (JJs) with sizes down to 200 nm has been developed on a 200-mm-wafer tool set typical for CMOS foundry. This process is…
Microwave Down-Conversion with an Impedance-Matched System in Driven Circuit QED
K. Inomata, K. Koshino, Z. R. Lin +4
By driving a dispersively coupled qubit-resonator system, we realize an "impedance-matched" system that has two identical radiative decay rates from the top level and interacts…
Flux qubit noise spectroscopy using Rabi oscillations under strong driving conditions
Fumiki Yoshihara, Yasunobu Nakamura, Fei Yan +4
We infer the high-frequency flux noise spectrum in a superconducting flux qubit by studying the decay of Rabi oscillations under strong driving conditions. The large anharmonicity…