124 citations · 861 across the 25 of their papers we have counts for
9 papers · 1 filter
Dynamics of a dispersively coupled transmon qubit in the presence of a noise source embedded in the control line
Antti Vaaranta, Marco Cattaneo, Russell E. Lake
We describe transmon qubit dynamics in the presence of noise introduced by an impedance-matched resistor () that is embedded in the qubit control line. To obtain the…
Microwave calibration of qubit drive line components at millikelvin temperatures
Slawomir Simbierowicz, Volodymyr Y. Monarkha, Suren Singh +3
Systematic errors in qubit state preparation arise due to non-idealities in the qubit control lines such as impedance mismatch. Using a data-based methodology of short-open-load ca…
Characterizing cryogenic amplifiers with a matched temperature-variable noise source
Slawomir Simbierowicz, Visa Vesterinen, Joshua Milem +7
We present a cryogenic microwave noise source with a characteristic impedance of 50 , which can be installed in a coaxial line of a cryostat. The bath temperature of the noise s…
Dielectric loss extraction for superconducting microwave resonators
C. R. H. McRae, R. E. Lake, J. L. Long +6
The investigation of two-level-state (TLS) loss in dielectric materials and interfaces remains at the forefront of materials research in superconducting quantum circuits. We demons…
Efficient quantum state tomography with auxiliary Hilbert space
Ruifeng Liu, Junling Long, Pei Zhang +4
Quantum state tomography is an important tool for quantum communication, computation, metrology, and simulation. Efficient quantum state tomography on a high dimensional quantum sy…
Active protection of a superconducting qubit with an interferometric Josephson isolator
Baleegh Abdo, Nicholas T. Bronn, Oblesh Jinka +8
Nonreciprocal microwave devices play several critical roles in high-fidelity, quantum-nondemolition (QND) measurement schemes. They separate input from output, impose unidirectiona…
Qubit gates using hyperbolic secant pulses
H. S. Ku, J. L. Long, X. Wu +5
It has been known since the early days of quantum mechanics that hyperbolic secant pulses possess the unique property that they can perform cyclic evolution on two-level quantum sy…
Electromagnetically induced transparency in circuit QED with nested polariton states
Junling Long, H. S. Ku, Xian Wu +5
Electromagnetically induced transparency (EIT) is a signature of quantum interference in an atomic three-level system. By driving the dressed cavity-qubit states of a two-dimension…
Quantum Gates for Propagating Microwave Photons
Roope Kokkoniemi, Tuomas Ollikainen, Russell E. Lake +6
We report a generic scheme to implement transmission-type quantum gates for propagating microwave photons, based on a sequence of lumped-element components on transmission lines. B…