Improving magnetic-field resilience of NbTiN planar resonators using a hard-mask fabrication technique DOI Creative Commons
Arne Bahr,

Matteo Boselli,

Benjamin Huard

et al.

arXiv (Cornell University), Journal Year: 2023, Volume and Issue: unknown

Published: Jan. 1, 2023

High-quality factor microwave resonators operating in a magnetic field are necessity for some quantum sensing applications and hybrid platforms. Losses superconducting can have several origins, including microscopic defects, usually known as two-level-systems (TLS). Here, we characterize the response of NbTiN patterned on sapphire observe clear absorption lines occurring at specific fields. We identify spin systems responsible these features, yet unreported with $g=1.85$ that attribute to defects thin film. develop mitigation strategies involving namely an aluminum etch mask, resulting maintaining quality factors above $Q>2 \times 10^5$ range $0$-$0.3$ T.

Language: Английский

Gate-tunable kinetic inductance parametric amplifier DOI
Lukas Johannes Splitthoff, Jaap J. Wesdorp, Marta Pita‐Vidal

et al.

Physical Review Applied, Journal Year: 2024, Volume and Issue: 21(1)

Published: Jan. 25, 2024

Reading out the state of a quantum system at low temperature is generally challenging, as weak signals must be amplified while adding little noise possible. Also, some qubit types rely on external magnetic fields and require magnetic-field-compatible superconducting parametric amplifiers. Here an innovative amp design leverages nonlinear response gate-tunable kinetic inductance proximitized semiconducting nanowires. The tunability allows integration with systems, thanks to minimal crosstalk, this can work semiconductor-based spin qubits other hybrid systems in 500 mT.

Language: Английский

Citations

15
Direct Detection of Down-Converted Photons Spontaneously Produced at a Single Josephson Junction DOI

Dorian Fraudet,

Izak Snyman, D. M. Basko

et al.

Physical Review Letters, Journal Year: 2025, Volume and Issue: 134(1)

Published: Jan. 9, 2025

We study spontaneous photon decay into multiple photons triggered by strong nonlinearities in an experimental simulator of a bosonic quantum impurity model. Previously, spectroscopic signatures conversion were reported and evidenced as resonances the many-body spectrum these systems. Here, we report on observation multimode fluorescence small Josephson junction embedded high impedance superconducting transmission line. Measurement down-converted is achieved using state-of-the-art broadband parametric amplifiers. Photon triplet emission explicitly demonstrated at given frequency counterpart inelastic 3× frequency. These results open exciting prospects for burgeoning field optics offer direct signature ultrastrong light-matter coupling.

Language: Английский

Citations

1
Direct calibration of microwave amplification chain on an axion cavity haloscope DOI
Hsin Chang, Han-Wen Liu, Hien Thi Doan

et al.

Review of Scientific Instruments, Journal Year: 2025, Volume and Issue: 96(1)

Published: Jan. 1, 2025

In an axion haloscope, the weak photon signal, theoretically converted from axions, is captured by a detection cavity. The signal cavity too to be acquired receiver. amplification chain assists acquisition amplifying and requires accurate gain calibration. Typically, readout line calibrated using Y-factor method, involving switch that directs either or calibration chain. lines may have different transmissions, which leads results being less accurate. response, we propose method eliminates need for switch. this approach, temperature decoupled its incoming noise source can controlled, resulting in excess deficiency of spectrum near resonance frequency. experimental result shows directly temperature-varied radiation.

Language: Английский

Citations

1
Circle fit optimization for resonator quality factor measurements: Point redistribution for maximal accuracy DOI Creative Commons
P. G. Baity, Connor Maclean, Valentino Seferai

et al.

Physical Review Research, Journal Year: 2024, Volume and Issue: 6(1)

Published: March 27, 2024

The control of material loss mechanisms is playing an increasingly important role for improving coherence times superconducting quantum devices. Such losses can be characterized through the measurement planar resonators, which reflect resonance's quality factor ${Q}_{l}$. resonance consists both internal (material) as well coupling when photons escape back into circuit. combined are then described ${Q}_{l}^{\ensuremath{-}1}=\mathrm{Re}{{Q}_{c}^{\ensuremath{-}1}}+{Q}_{i}^{\ensuremath{-}1}$, where ${Q}_{c}$ and ${Q}_{i}$ factors resonator, respectively. To separate relative contributions to ${Q}_{l}$, diameter-correcting circle fits use algebraic or geometric means fit signal on complex plane. However, such produce varied results, so address this issue, we a combination simulation experiment determine reliability fitting algorithm across wide range values from ${Q}_{i}\ensuremath{\ll}{Q}_{c}$ ${Q}_{c}\ensuremath{\ll}{Q}_{i}$. In addition, develop protocol that not only reduce errors by $\ensuremath{\gtrsim}2$ but also mitigates influence background results. This technique generalized other systems beyond resonators.

Language: Английский

Citations

4
Decoherence of surface phonons in a quantum acoustic system DOI
C. Undershute, J. M. Kitzman,

Camille A. Mikolas

et al.

Physical review. A/Physical review, A, Journal Year: 2025, Volume and Issue: 111(1)

Published: Jan. 13, 2025

Phononic resonators are becoming increasingly important in quantum information science, both for applications computing, communication, and sensing as well experiments investigating fundamental physics. Here, we study the decoherence of phonons confined a surface acoustic wave (SAW) resonator strongly coupled (g/2π≈9MHz) to superconducting transmon qubit. By comparing experimental data with numerical solutions Markovian master equation, report phononic energy decay rate κ1/2π=480kHz pure dephasing κϕ/2π=180kHz. These rates good agreement level extract from qubit-assisted spectroscopic measurements SAW resonator. We additionally find that timescales over which coherent driven dynamics occur comparable, highlighting need model composite device an open system. discuss possible sources SAW-based devices application these future dissipation engineering experiments. The characterization techniques employ broadly applicable benchmarking effects loss on mechanical regime. locked icon Physics Subject Headings (PhySH)Hybrid systemsOpen systems & decoherenceQuantum circuitsSuperconducting qubitsSurface

Language: Английский

Citations

0
Magnetic-field-tolerant superconducting spiral resonators for circuit quantum electrodynamics DOI

Mihirangi Medahinne,

Yadav P. Kandel, Suraj Thapa Magar

et al.

Physical Review Applied, Journal Year: 2025, Volume and Issue: 23(1)

Published: Jan. 28, 2025

Citations

0
Niobium quantum interference microwave circuits with monolithic three-dimensional nanobridge junctions DOI
Kevin Uhl,

Daniel Hackenbeck,

Janis Peter

et al.

Physical Review Applied, Journal Year: 2024, Volume and Issue: 21(2)

Published: Feb. 27, 2024

Nonlinear microwave circuits are key elements for many groundbreaking research directions and technologies, such as quantum computation sensing. The majority of with Josephson nonlinearities to date based on aluminum thin films; therefore, they severely restricted in their operation range regarding temperatures external magnetic fields. Here, we present the realization superconducting niobium resonators integrated, three-dimensional (3D) nanobridge-based interference devices. 3D nanobridges (constriction weak links) monolithically patterned into prefabricated $LC$ using neon focused-ion-beam milling, resulting show frequency tunabilities, flux responsivities, Kerr par comparable nanobridge devices, but perspective a much larger parameter regime. Our results demonstrate that milling is promising method fabricating constriction junctions flexible parameters reveal great potential application hybrid systems with, e.g., magnons spin ensembles or flux-mediated optomechanics.

Language: Английский

Citations

2
Quantum collective motion of macroscopic mechanical oscillators DOI
Mahdi Chegnizadeh, Marco Scigliuzzo, Amir Youssefi

et al.

Science, Journal Year: 2024, Volume and Issue: 386(6728), P. 1383 - 1388

Published: Dec. 19, 2024

Collective phenomena arise from interactions within complex systems, leading to behaviors absent in individual components. Observing quantum collective with macroscopic mechanical oscillators has been impeded by the stringent requirement that be identical. We demonstrate regime for motion of N = 6 oscillators, a hexamer, superconducting circuit optomechanical platform. By increasing couplings, system transitions motion, characterized N enhancement cavity-collective mode coupling, akin superradiance atomic ensembles. Using sideband cooling, we prepare ground state and measure its asymmetry, zero-point distributed across distant oscillators. This optomechanics opens avenues studying multipartite entanglement, potential advances metrology.

Language: Английский

Citations

2
Granular Aluminum Parametric Amplifier for Low-Noise Measurements in Tesla Fields DOI
Nicolas Zapata, Ivan Takmakov, Simon Günzler

et al.

Physical Review Letters, Journal Year: 2024, Volume and Issue: 133(26)

Published: Dec. 27, 2024

Josephson junction parametric amplifiers have become essential tools for microwave quantum circuit readout with minimal added noise. Even after improving at an impressive rate in the past decade, they remain vulnerable to magnetic fields, which limits their use many applications such as spin qubits, Andreev and molecular magnet devices, dark matter searches, etc. Kinetic inductance materials, granular aluminum (grAl), offer alternative source of nonlinearity innate field resilience. We present a nondegenerate amplifier made two coupled grAl resonators resilient in-plane fields up 1T. It offers 20 dB gain close limit noise, gain-bandwidth product 28 MHz -110 dBm input saturation power.

Language: Английский

Citations

2
A flux-tunable YBa2Cu3O7 quantum interference microwave circuit DOI Open Access
Kevin Uhl,

Daniel Hackenbeck,

Christoph Füger

et al.

Applied Physics Letters, Journal Year: 2023, Volume and Issue: 122(18)

Published: May 1, 2023

Josephson microwave circuits are essential for the currently flourishing research on superconducting technologies, such as quantum computation, sensing, and signal processing. To increase possible parameter space device operation with respect to current standards, many materials under active investigation. Here, we present realization of a frequency-tunable, weakly nonlinear circuit made high-temperature cuprate superconductor YBa2Cu3O7 (YBCO), material high critical temperature very magnetic field. An in situ frequency-tunability ∼300 MHz is achieved by integrating interference (SQUID) into based junctions directly written helium ion microscope (HIM). Our results demonstrate that YBCO-HIM-SQUID resonators promising candidates sensing technology applications.

Language: Английский

Citations

5