124 citations · 861 across the 25 of their papers we have counts for
26 papers
Fabrication of Specimens for Atom Probe Tomography Using a Combined Gallium and Neon Focused Ion Beam Milling Approach
Frances I. Allen, Paul T. Blanchard, Russell Lake +6
We demonstrate a new focused ion beam sample preparation method for atom probe tomography. The key aspect of the new method is that we use a neon ion beam for the final tip-shaping…
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…
Cryogenic sensor enabling broad-band and traceable power measurements
J. -P. Girard, R. E. Lake, W. Liu +4
Recently, great progress has been made in the field of ultrasensitive microwave detectors, reaching even the threshold for utilization in circuit quantum electrodynamics. However,…
Direct formation of nitrogen-vacancy centers in nitrogen doped diamond along the trajectories of swift heavy ions
Russell E. Lake, Arun Persaud, Casey Christian +6
We report depth-resolved photoluminescence measurements of nitrogen-vacancy (NV) centers formed along the tracks of swift heavy ions (SHIs) in type Ib synthetic single crystal…
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…
Bolometer operating at the threshold for circuit quantum electrodynamics
R. Kokkoniemi, J. -P. Girard, D. Hazra +7
Radiation sensors based on the heating effect of the absorbed radiation are typically relatively simple to operate and flexible in terms of the input frequency. Consequently, they…
Overlap junctions for superconducting quantum electronics and amplifiers
Mustafa Bal, Junling Long, Ruichen Zhao +10
Due to their unique properties as lossless, nonlinear circuit elements, Josephson junctions lie at the heart of superconducting quantum information processing. Previously, we demon…
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…
Optimized heat transfer at exceptional points in quantum circuits
Matti Partanen, Jan Goetz, Kuan Yen Tan +12
Superconducting quantum circuits are potential candidates to realize a large-scale quantum computer. The envisioned large density of integrated components, however, requires a prop…
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…
Observation of a broadband Lamb shift in an engineered quantum system
Matti Silveri, Shumpei Masuda, Vasilii Sevriuk +9
The shift of energy levels owing to broadband electromagnetic vacuum fluctuations, the Lamb shift, has been pivotal in the development of quantum electrodynamics and in understandi…
Nanobolometer with Ultralow Noise Equivalent Power
R. Kokkoniemi, J. Govenius, V. Vesterinen +10
Since the introduction of bolometers more than a century ago, they have been applied in a broad spectrum of contexts ranging from security and the construction industry to particle…
Enhanced Superconducting Transition Temperature in Electroplated Rhenium
David P. Pappas, Donald E. David, Russell E. Lake +13
We show that electroplated Re films in multilayers with noble metals such as Cu, Au, and Pd have an enhanced superconducting critical temperature relative to previous methods of pr…
Flux-tunable heat sink for quantum electric circuits
Matti Partanen, Kuan Yen Tan, Shumpei Masuda +10
Superconducting microwave circuits show great potential for practical quantum technological applications such as quantum information processing. However, fast and on-demand initial…
Overlap junctions for high coherence superconducting qubits
X. Wu, J. L. Long, H. S. Ku +3
Fabrication of sub-micron Josephson junctions is demonstrated using standard processing techniques for high-coherence, superconducting qubits. These junctions are made in two separ…
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…
Cryogenic microwave source based on nanoscale tunnel junctions
Shumpei Masuda, Kuan Y. Tan, Matti Partanen +5
We experimentally realize an incoherent microwave source driven by voltage-controlled quantum tunneling of electrons through nanoscale normal-metal--insulator--superconductor junct…
Microwave Admittance of Gold-Palladium Nanowires with Proximity-Induced Superconductivity
Russell E. Lake, Joonas Govenius, Roope Kokkoniemi +4
We report quantitative electrical admittance measurements of diffusive superconductor--normal-metal--superconductor (SNS) junctions at gigahertz frequencies and millikelvin tempera…
Quantum Circuit Refrigerator
Kuan Yen Tan, Matti Partanen, Russell E. Lake +3
Quantum technology promises revolutionizing applications in information processing, communications, sensing, and modelling. However, efficient on-demand cooling of the functional q…
Detection of zeptojoule microwave pulses using electrothermal feedback in proximity-induced Josephson junctions
J. Govenius, R. E. Lake, K. Y. Tan +1
We experimentally investigate and utilize electrothermal feedback in a microwave nanobolometer based on a normal-metal ($\mbox{Au}_{x}\mbox{Pd}_{1-x}$) nanowire with proximity-indu…