Mario Blaum, John L. Fan, et al.
IEEE International Symposium on Information Theory - Proceedings
We demonstrate microwave measurements of the Andreev-bound-state (ABS) spectrum in planar Josephson junctions (JJs) defined in Ge high-mobility two-dimensional hole gases contacted by superconducting platinum germanosilicide (PtSiGe). The JJs and readout circuitry are located on separate chips and inductively coupled via flip-chip bonding. For a device with 350-nm junction length, the spectroscopic signatures were consistent with the short-junction limit, with an induced superconducting gap Δ - ≈48μeV and transmission τ≈0.94. The interaction between the highest-transmission ABS and the resonator was well described by a Jaynes-Cummings model with a vacuum Rabi splitting of approximately 6 MHz. A device with a junction length of 1μm showed an ABS spectrum consistent with a long-junction model. Time-resolved monitoring of the readout resonator in the dispersive regime revealed gate-voltage tunable-junction parity fluctuations on the time scale of seconds. Our work indicates a viable path toward hybrid quantum devices based on planar Ge.
Mario Blaum, John L. Fan, et al.
IEEE International Symposium on Information Theory - Proceedings
T. Graham, A. Afzali, et al.
Microlithography 2000
Amir Ali Ahmadi, Raphaël M. Jungers, et al.
SICON
Timothy J. Wiltshire, Joseph P. Kirk, et al.
SPIE Advanced Lithography 1998