Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Quantum Computation as Impedance Matching: Translating Free-Space Quantum Impedance Networks to Superconducting Circuits

Peter Cameron, Michigan / Mit, Brookhaven

Published Jan 1, 2026• 0 citations
Publisher
DOI
10.13140/rg.2.2.19328.90888

Related papers

Superconducting Tunable Microwave Impedance Matching Network

Raihan Rafique, Thomas Ohki, Peter Linnér +1 more

•Jan 1, 2007•0 citations

Superconducting circuits for quantum computation

Leszek Jaroszynski

PRZEGLĄD ELEKTROTECHNICZNY•Jan 1, 2009•0 citations

Graphical impedance-matching method for a superconducting parametric amplifier

Kaiyong He, Qing Yu, Liangliang Yang +3 more

This work proposes a graphical impedance-matching method for superconducting parametric amplifiers with quantum-limited noise performance using a modified Smith chart. It enables one to quickly apply the impedance-matching methods in microwave engineering to the design of parametric amplifiers. When the matching networks are composed of resonators and their equivalents, the matching of a parametric amplifier can be reduced to that of a negative-resistance amplifier, which is generally invalid due to the connection between the signal-frequency and idler-frequency networks introduced by the parametrically modulated component. Several examples are presented to demonstrate the effective and efficient matching of parametric amplifiers using this method, circumventing the need for complex calculations. This method also offers intuitive insight into how variations in pump strength and bias affect the amplification behavior of the circuit, which is useful in characterizing the parametric amplifier and finding the optimal operating state.

Physical Review Applied•Mar 26, 2024•4 citations

Measuring a Quantum Dot with an Impedance-Matching On-Chip Superconducting LC Resonator at Gigahertz Frequencies

M.-C. Harabula, T. Hasler, G. Fülöp +3 more

It can be hard to find that perfect match---even, or perhaps especially, in quantum electronics. Microwave readout of highly Ohmic quantum devices, like superconducting qubits, necessitates impedance-matching circuits to maximize power transfer. $L\phantom{\rule{0}{0ex}}C$ resonant circuits enjoy two major advantages over well-established coplanar transmission-line circuits: larger bandwidths (and thus shorter readout times), and drastically smaller on-chip footprints. With this in mind, the authors develop a compact $L\phantom{\rule{0}{0ex}}C$ resonator operating at 3 GHz to bridge a load of ~15 k$\mathrm{\ensuremath{\Omega}}$ to a typical coaxial line at 50 $\mathrm{\ensuremath{\Omega}}$---match made.

arXiv:1707.09061•Physical Review Applied•Nov 6, 2017•17 citations

Introduction to Superconducting Quantum Circuits

Michael Stern

Lecture notes in physics•Jan 1, 2024•0 citations

Broadband SNAIL parametric amplifier with microstrip impedance transformer

Daria A. Moskaleva, Dmitry O. Moskalev, Nikita S. Smirnov +8 more

Josephson parametric amplifiers are an important part of a modern superconducting quantum computing platform and squeezed quantum states generation devices. Traveling wave and impedance-matched parametric amplifiers provide broad bandwidth for high-fidelity single-shot readout of multiple qubit superconducting circuits. Here, we present a quantum-limited 3-wave-mixing parametric amplifier based on superconducting nonlinear asymmetric inductive elements (SNAILs), whose useful bandwidth is enhanced with an on-chip two-section impedance-matching circuit based on microstrip transmission lines. The amplifier dynamic range is increased using an array of 67 SNAILs with 268 Josephson junctions, forming a nonlinear quarter-wave resonator. Operating in a current-pumped mode, we experimentally demonstrate an average gain of 17 dB across 300 MHz bandwidth, along with an average saturation power of –100 dBm, which can go as high as −97 dBm with quantum-limited noise performance. Moreover, the amplifier can be fabricated using a simple technology with just one e-beam lithography step.

arXiv:2210.15334•Applied Physics Letters•Dec 5, 2022•24 citations
This work proposes a graphical impedance-matching method for superconducting parametric amplifiers with quantum-limited noise performance using a modified Smith chart. It enables one to quickly apply the impedance-matching methods in microwave engineering to the design of parametric amplifiers. When the matching networks are composed of resonators and their equivalents, the matching of a parametric amplifier can be reduced to that of a negative-resistance amplifier, which is generally invalid due to the connection between the signal-frequency and idler-frequency networks introduced by the parametrically modulated component. Several examples are presented to demonstrate the effective and efficient matching of parametric amplifiers using this method, circumventing the need for complex calculations. This method also offers intuitive insight into how variations in pump strength and bias affect the amplification behavior of the circuit, which is useful in characterizing the parametric amplifier and finding the optimal operating state.
It can be hard to find that perfect match---even, or perhaps especially, in quantum electronics. Microwave readout of highly Ohmic quantum devices, like superconducting qubits, necessitates impedance-matching circuits to maximize power transfer. $L\phantom{\rule{0}{0ex}}C$ resonant circuits enjoy two major advantages over well-established coplanar transmission-line circuits: larger bandwidths (and thus shorter readout times), and drastically smaller on-chip footprints. With this in mind, the authors develop a compact $L\phantom{\rule{0}{0ex}}C$ resonator operating at 3 GHz to bridge a load of ~15 k$\mathrm{\ensuremath{\Omega}}$ to a typical coaxial line at 50 $\mathrm{\ensuremath{\Omega}}$---match made.
Josephson parametric amplifiers are an important part of a modern superconducting quantum computing platform and squeezed quantum states generation devices. Traveling wave and impedance-matched parametric amplifiers provide broad bandwidth for high-fidelity single-shot readout of multiple qubit superconducting circuits. Here, we present a quantum-limited 3-wave-mixing parametric amplifier based on superconducting nonlinear asymmetric inductive elements (SNAILs), whose useful bandwidth is enhanced with an on-chip two-section impedance-matching circuit based on microstrip transmission lines. The amplifier dynamic range is increased using an array of 67 SNAILs with 268 Josephson junctions, forming a nonlinear quarter-wave resonator. Operating in a current-pumped mode, we experimentally demonstrate an average gain of 17 dB across 300 MHz bandwidth, along with an average saturation power of –100 dBm, which can go as high as −97 dBm with quantum-limited noise performance. Moreover, the amplifier can be fabricated using a simple technology with just one e-beam lithography step.