Article
Physics, Applied
Martina Esposito, Arpit Ranadive, Luca Planat, Nicolas Roch
Summary: Quantum-limited microwave parametric amplifiers are crucial for emerging quantum technologies and applications requiring successful readout of weak microwave signals with minimal noise. This perspective focuses on traveling wave parametric amplifiers, discussing recent achievements and current challenges. Future research directions may explore these devices as platforms for multi-mode entanglement generation and single photon detectors.
APPLIED PHYSICS LETTERS
(2021)
Article
Physics, Applied
D. Phan, P. Falthansl-Scheinecker, U. Mishra, W. M. Strickland, D. Langone, J. Shabani, A. P. Higginbotham
Summary: We constructed a parametric amplifier using a Josephson field-effect transistor (JoFET) as the active component. The resonance frequency of this device can be tuned over a range of 2 GHz by the field-effect. The JoFET amplifier provides a gain of 20 dB, an instantaneous bandwidth of 4 MHz, and a 1-dB compression point of -125.5 dBm when operating at a fixed resonance frequency.
PHYSICAL REVIEW APPLIED
(2023)
Article
Optics
G. S. Thekkadath, S. Sempere-Llagostera, B. A. Bell, R. B. Patel, M. S. Kim, I. A. Walmsley
Summary: In this study, the discrimination of binary-phase-shifted coherent states at a telecom wavelength was successfully achieved using a photon-number-resolving detector, the transition-edge sensor, resulting in a bit error probability that exceeds the standard quantum limit by up to 7.7 dB. This improvement persists for signals containing up to approximately seven photons on average and can be achieved in a single shot, making the approach compatible with larger bandwidths.
Article
Physics, Applied
J. Grebel, A. Bienfait, E. Dumur, H. -S. Chang, M. -H. Chou, C. R. Conner, G. A. Peairs, R. G. Povey, Y. P. Zhong, A. N. Cleland
Summary: A simple design for a Josephson parametric amplifier has been presented, with an emphasis on optimizing flux-coupling geometry and using an impedance-matching circuit to enhance bandwidth. It operates in a flux-pumped mode with over 20dB power gain over a bandwidth of about 300MHz, demonstrating quantum-limited performance based on approximate noise measurements.
APPLIED PHYSICS LETTERS
(2021)
Article
Quantum Science & Technology
R. Dassonneville, R. Assouly, T. Peronnin, A. A. Clerk, A. Bienfait, B. Huard
Summary: This study overcomes the 3 dB squeezing limit in the intraresonator state by implementing a reservoir-engineering method using superconducting circuits, achieving squeezing as high as 8.2 +/- 0.8 dB with a purity of 0.91 +/- 0.09. The effective coupling to a squeezed bath stabilized the squeezed state inside the resonator, demonstrated by performing a direct Wigner tomography with a superconducting qubit as a probe.
Article
Engineering, Electrical & Electronic
Ahmed A. Barakat, Peter Hagedorn
Summary: This paper presents a broadband amplification method based on parametric excitation, which induces modal-coupled phase-shifted parametric excitation in multi-degree of freedom dynamic systems to destabilize the system over a wide frequency band, thereby increasing device sensitivity.
SENSORS AND ACTUATORS A-PHYSICAL
(2021)
Article
Physics, Multidisciplinary
Jack Y. Qiu, Arne Grimsmo, Kaidong Peng, Bharath Kannan, Benjamin Lienhard, Youngkyu Sung, Philip Krantz, Vladimir Bolkhovsky, Greg Calusine, David Kim, Alex Melville, Bethany M. Niedzielski, Jonilyn Yoder, Mollie E. Schwartz, Terry P. Orlando, Irfan Siddiqi, Simon Gustavsson, Kevin P. O'Brien, William D. Oliver
Summary: Squeezing of the electromagnetic vacuum is a vital technique for reducing quantum noise in various applications. Researchers have developed a dual-pump, broadband Josephson travelling-wave parametric amplifier that achieves single-mode squeezing comparable to the best resonator-based squeezers. Additionally, they demonstrate two-mode squeezing at microwave frequencies with a significantly wider bandwidth than contemporary resonator-based squeezers. The amplifier has the potential to create entangled microwave photon pairs with large frequency separation, enabling high-fidelity qubit readout, quantum illumination, and teleportation.
Article
Optics
N. Ekanayake, M. Spilatro, A. Bolognesi, S. Herman, S. Sampat, E. M. Hill, C. Dorrer
Summary: Spectrally incoherent laser pulses with large fractional bandwidth are needed to mitigate laser-plasma instabilities in high-energy laser-target interactions. A dual-stage high-energy optical parametric amplifier for broadband, spectrally incoherent pulses in the near-infrared was modeled, implemented, and optimized. The amplifier delivers close to 400 mJ of signal energy through noncollinear parametric interaction of 100-nJ-scale broadband, spectrally incoherent seed pulses near 1053 nm with a narrowband high-energy pump operating at 526.5 nm. Mitigation strategies for high-frequency spatial modulations caused by index inhomogeneities in the Nd:YLF rods of the pump laser are explored and discussed.
Article
Physics, Applied
Gopika Lakshmi Bhai, Hiroto Mukai, Tsuyoshi Yamamoto, Jaw-Shen Tsai
Summary: We perform noise spectroscopy of a Josephson parametric oscillator (JPO) using a microwave homodyne interferometric measurement scheme. Fluctuations in the self-oscillating output field of the JPO were observed for a long time interval in a single-shot measurement, and the phase and amplitude noise were characterized. The effects of the pump strength on the output noise power spectra of the JPO were investigated, with strong phase fluctuations exhibiting a 1/f(2) characteristic in the phase noise power spectrum that can be suppressed by increasing the pump strength.
PHYSICAL REVIEW APPLIED
(2023)
Article
Quantum Science & Technology
Y. Jiang, E. P. Ruddy, K. O. Quinlan, M. Malnou, N. E. Frattini, K. W. Lehnert
Summary: Quantum fluctuations are the main obstacle in cavity-based axion-dark-matter searches. In an experiment mimicking a real axion search, we use a quantum enhanced sensing technique to detect a weakly coupled synthetic axionlike microwave tone, achieving a 5.6 times acceleration compared to a quantum limited search for the same tone. The acceleration is achieved by dynamically coupling the resonator mode to a second mode with balanced swapping and two-mode squeezing interactions, resulting in increased visibility-bandwidth and peak visibility. A small fractional imbalance between the two interaction rates further enhances the scan rate, and we demonstrate an eightfold acceleration.
Article
Quantum Science & Technology
Yun-Yi Pai, Claire E. Marvinney, Chengyun Hua, Raphael C. Pooser, Benjamin J. Lawrie
Summary: Magneto-optical sensors, such as spin noise spectroscopies and magneto-optical Kerr effect microscopies, are essential tools for materials characterization, providing insights into spin dynamics and other interactions. Quantum-enhanced spin noise measurements offer higher sensitivity and lower operating temperatures, presenting a significant advantage over classical measurements.
ADVANCED QUANTUM TECHNOLOGIES
(2022)
Article
Optics
Yirui Wang, Jing Wang, Bingjie Zhou, Jingui Ma, Peng Yuan, Liejia Qian
Summary: OPCPA is susceptible to undesired spatiotemporal couplings caused by nonlinear phase shifts from frequency-dependent phase mismatch. These couplings result in pulse-front deformation, transversely varying pulse duration, and spectrally varying wavefront curvature, directly related to phase-mismatch dispersion terms. Numerical study shows that focused signal intensity significantly decreases with increasing signal bandwidth and pump depletion.
Article
Physics, Applied
Gopika Lakshmi Bhai, Hiroto Mukai, Jaw-Shen Tsai
Summary: Injection locking is a well-established technique used to suppress noise in optics and solid-state devices. This study characterizes the spectroscopic effect of the injection-locking signal (ILS) on mitigating the phase noise of a Josephson parametric oscillator. By injecting a weak locking signal, the phase noise power spectral density of the self-sustained oscillator output state was measured. The results showed that injection locking can suppress phase noise and completely pin the output state to the locking phase of the ILS, leading to significant suppression of random telegraphic noise caused by state switching.
APPLIED PHYSICS LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Boya Xie, Dechao He, Peng Yang, Sheng Feng
Summary: This study explores heterodyne detection to sense subhertz optical signals at the quantum noise limit. The experiment achieves quantum-noise-limited sensitivity from 0.2 Hz to 10 Hz, paving the way for ultra-sensitive technological development.
SENSORS AND ACTUATORS A-PHYSICAL
(2022)
Article
Materials Science, Multidisciplinary
Angelo Greco, Luca Fasolo, Alice Meda, Luca Callegaro, Emanuele Enrico
Summary: In this paper, a quantum model for Josephson-based metamaterials working at the single-photon level in the three-wave mixing (3WM) and four-wave mixing (4WM) regimes is presented. The model utilizes a Hamiltonian approach to analytically determine the system's time evolution, and evaluates the dependence of the metamaterial's nonlinearities on circuit parameters while considering the effects of experimental conditions on model validity.
Review
Physics, Multidisciplinary
Timm Fabian Morstedt, Arto Viitanen, Vasilii Vadimov, Vasilii Sevriuk, Matti Partanen, Eric Hyyppa, Gianluigi Catelani, Matti Silveri, Kuan Yen Tan, Mikko Mottonen
Summary: This article reviews the recent progress in direct active cooling of the quantum-electric degrees of freedom in engineered circuits, known as quantum-circuit refrigeration. Experimental studies have demonstrated the controllability of the damping rate of a superconducting microwave resonator and the ability to reset superconducting qubits in nanosecond timescales using quasiparticles and microwave excitation. The use of quantum-circuit refrigeration as an incoherent photon source with an output temperature above 1 K has also been demonstrated, providing potential applications in calibrating cryogenic amplification chains.
ANNALEN DER PHYSIK
(2022)
Article
Physics, Applied
Carolina Luethi, Luis Flacke, Aisha Aqeel, Akashdeep Kamra, Rudolf Gross, Christian Back, Mathias Weiler
Summary: We investigate the coupled magnetization dynamics in heterostructures of a single crystal of the chiral magnet Cu2OSeO3 (CSO) and a polycrystalline ferromagnet NiFe (Py) thin film using broadband ferromagnetic resonance (FMR) at cryogenic temperatures. We observe the excitation of a hybrid mode (HM) below the helimagnetic transition temperature of CSO, which is attributed to the spin dynamics at the CSO/Py interface. The HM exhibits dominantly fourfold anisotropy in contrast to the FMR of CSO and Py.
APPLIED PHYSICS LETTERS
(2023)
Article
Physics, Multidisciplinary
Janine Gueckelhorn, Sebastian de-la-Pena, Monika Scheufele, Matthias Grammer, Matthias Opel, Stephan Gepraegs, Juan Carlos Cuevas, Rudolf Gross, Hans Huebl, Akashdeep Kamra, Matthias Althammer
Summary: The magnon Hanle effect, caused by the precession of magnon pseudospin about the equilibrium pseudofield, has been realized in an antiferromagnetic insulator through electrically injected and detected spin transport. The nonreciprocity in the measured Hanle signal in hematite using spatially separated platinum electrodes as spin injector or detector has been observed, and it can be controlled by the applied magnetic field. This nonreciprocal response opens up opportunities for realizing exotic physics in readily available hematite films.
PHYSICAL REVIEW LETTERS
(2023)
Article
Multidisciplinary Sciences
Qi-Ming Chen, Michael Fischer, Yuki Nojiri, Michael Renger, Edwar Xie, Matti Partanen, Stefan Pogorzalek, Kirill G. Fedorov, Achim Marx, Frank Deppe, Rudolf Gross
Summary: By measuring the non-equilibrium dynamics of a superconducting Duffing oscillator, we experimentally reconcile the classical and quantum descriptions and explain the classically regarded steady states as quantum metastable states. Our results reveal a smooth quantum state evolution behind a sudden dissipative phase transition and provide insights into the intriguing phenomena in driven-dissipative systems.
NATURE COMMUNICATIONS
(2023)
Article
Physics, Multidisciplinary
J. Hofer, R. Gross, G. Higgins, H. Huebl, O. F. Kieler, R. Kleiner, D. Koelle, P. Schmidt, J. A. Slater, M. Trupke, K. Uhl, T. Weimann, W. Wieczorek, M. Aspelmeyer
Summary: This study reports the levitation of a superconducting lead-tin sphere in a static magnetic trap, with monitoring of its motion and demonstration of magnetic feedback control. The experiment has established a promising platform for testing quantum physics in high mass and long coherence times.
PHYSICAL REVIEW LETTERS
(2023)
Article
Materials Science, Multidisciplinary
S. Oberbauer, S. Erkenov, W. Biberacher, N. D. Kushch, R. Gross, M. V. Kartsovnik
Summary: The physics of the Mott metal-insulator transition has attracted much interest, but some key theoretical predictions lack experimental confirmation. By using organic K-type salts as quasi-two-dimensional bandwidth-controlled Mott insulators, and measuring their charge-carrier properties through magnetic quantum oscillations, we address these issues. We find that the mass renormalization is more sensitive to small changes in bandwidth than predicted, and it becomes even stronger in the transition region where the metallic and insulating phases coexist. Additionally, the metallic ground state preserves a large coherent Fermi surface even on the edge of its existence.
Article
Materials Science, Multidisciplinary
Thomas Luschmann, Alexander Jung, Stephan Gepraegs, Franz X. Haslbeck, Achim Marx, Stefan Filipp, Simon Groblacher, Rudolf Gross, Hans Huebl
Summary: In this study, the performance of SAW devices fabricated on LNO-on-insulator and LNO-on-Silicon substrates was systematically investigated. The results show that these devices have comparable performance to devices on bulk LNO and are viable for use in SAW-based quantum acoustic devices.
MATERIALS FOR QUANTUM TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Qi-Ming Chen, Meike Pfeiffer, Matti Partanen, Florian Fesquet, Kedar E. Honasoge, Fabian Kronowetter, Yuki Nojiri, Michael Renger, Kirill G. Fedorov, Achim Marx, Frank Deppe, Rudolf Gross
Summary: We present a unified classical approach to analyze the scattering coefficients of superconducting microwave resonators with different geometries. Our study also considers the impacts of small circuit asymmetry and the finite length of the feedlines, providing a procedure to correct for these influences in typical experiments. We demonstrate that the reflection coefficient of necklace- or cross-type resonators contains a reference point, similar to the transmission coefficient of hanger-type resonators, which can be used to characterize the internal quality factor of the resonator. Our results offer a comprehensive understanding of superconducting microwave resonators, covering design concepts to characterization details.
Article
Materials Science, Multidisciplinary
Qi-Ming Chen, Matti Partanen, Florian Fesquet, Kedar E. Honasoge, Fabian Kronowetter, Yuki Nojiri, Michael Renger, Kirill G. Fedorov, Achim Marx, Frank Deppe, Rudolf Gross
Summary: We present a unified quantum approach to analyze the scattering coefficients of superconducting microwave resonators with various geometries and demonstrate its consistency with the classical approach. We extend the results to a chain of resonators with time delays, revealing several transport properties similar to a photonic crystal that can be utilized for designing high-quality resonators. These findings provide a solid theoretical foundation for analyzing the scattering coefficients of arbitrary resonator networks and represent a step forward in the design and characterization of superconducting microwave resonators within complex superconducting quantum circuits.
Article
Materials Science, Multidisciplinary
Janine Gueckelhorn, Akashdeep Kamra, Tobias Wimmer, Matthias Opel, Stephan Gepraegs, Rudolf Gross, Hans Huebl, Matthias Althammer
Summary: The pseudospin of spin-up and spin-down magnons can describe the phenomena in antiferromagnets, which are similar to electronic charge carriers. The experimental study of the dynamics of antiferromagnetic pseudospin and the observation of the magnon Hanle effect have been reported. Platinum strips are used in the experiment to realize spin injection and detection, and their influence on the generation and transport of magnons in antiferromagnetic insulator films is investigated.
Article
Optics
Qi-Ming Chen, Fabian Kronowetter, Florian Fesquet, Kedar E. Honasoge, Yuki Nojiri, Michael Renger, Kirill G. Fedorov, Achim Marx, Frank Deppe, Rudolf Gross
Summary: The paper proposes a tunable coupler made up of quantum bits that can adjust and amplify interactions between superconducting quantum circuits, achieving single-step switching. The results are expected to not only stimulate interest in collective effects in quantum information processing, but also enable the development of applications in tuning and amplifying interactions in general cavity-QED systems.
Article
Materials Science, Multidisciplinary
M. Mueller, T. Luschmann, A. Faltermeier, S. Weichselbaumer, L. Koch, G. B. P. Huber, H. W. Schumacher, N. Ubbelohde, D. Reifert, T. Scheller, F. Deppe, A. Marx, S. Filipp, M. Althammer, R. Gross, H. Huebl
Summary: In this study, we systematically investigated the performance of compact NbTiN microwave resonators under different temperature and magnetic field conditions. The results show that the resonators exhibit good quality factors and power factors at suitable temperatures.
MATERIALS FOR QUANTUM TECHNOLOGY
(2022)
