Article
Physics, Applied
Caglar Kutlu, Arjan F. van Loo, Sergey Uchaikin, Andrei N. Matlashov, Doyu Lee, Seonjeong Oh, Jinsu Kim, Woohyun Chung, Yasunobu Nakamura, Yannis K. Semertzidis
Summary: This paper reports on the operation of a flux-driven Josephson parametric amplifier (JPA) operating at around 2.3 GHz with added noise approaching the quantum limit. By operating the JPA at a gain of 19 dB and cascading it with two cryogenic amplifiers operating at 4 K, noise temperatures as low as 120 mK were achieved for the whole signal detection chain.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2021)
Article
Physics, Applied
Imran Mahboob, Hiraku Toida, Kousuke Kakuyanagi, Yasunobu Nakamura, Shiro Saito
Summary: The experiment achieved high gain by implementing a Josephson parametric amplifier (JPA) in a three-wave mixing configuration in a three-dimensional microwave cavity, coupled to a superconducting quantum interference device (SQUID) embedded in a two-dimensional resonator.
APPLIED PHYSICS EXPRESS
(2022)
Article
Physics, Applied
Dong Hwan Kim, Su-Yong Lee, Zaeill Kim, Taek Jeong, Duk Y. Kim
Summary: Two-mode squeezed vacuum states are important for quantum technologies and can be generated by a Josephson ring modulator acting as a three-wave mixing nondegenerate parametric amplifier in the microwave domain. By numerically solving the full master equation of the Josephson ring modulator, we calculate squeezing of output fields and gain at low signal power. The results reveal that the third-order interaction from the three-wave mixing process inherently limits squeezing and reduces gain, suggesting an intrinsic squeezing limit in the output fields of any nondegenerate parametric amplifier.
PHYSICAL REVIEW APPLIED
(2023)
Article
Quantum Science & Technology
Kirill Viktorovich Petrovnin, Michael Romanovich Perelshtein, Tero Korkalainen, Visa Vesterinen, Ilari Lilja, Gheorghe Sorin Paraoanu, Pertti Juhani Hakonen
Summary: In this work, the generation and control of genuine tripartite and quadripartite quantum entanglement states are achieved by utilizing the phase difference between pump tones. The study provides a comprehensive control toolbox for entanglement structures and enhances the prospects of quantum data processing using parametric microwave cavities.
ADVANCED QUANTUM TECHNOLOGIES
(2023)
Article
Quantum Science & Technology
S. K. Singh, M. Mazaheri, Jia-Xin Peng, Amjad Sohail, Zhidong Gu, M. Asjad
Summary: We investigated the impact of a degenerate optical parametric amplifier (OPA) placed inside a cavity on the normal mode splitting (NMS) in the displacement spectrum of a moving membrane and the output cavity field squeezing spectrum. Our study showed that the nonlinear OPA gain G and phase angle theta can qualitatively and quantitatively alter the NMS behavior in the displacement spectrum of the mechanical mode and the output cavity field spectrum. Furthermore, we found that the squeezing bandwidth of the output cavity quadrature can be enhanced by adjusting the OPA parameters, even at higher temperatures or in the presence of significant mechanical thermal noise.
QUANTUM INFORMATION PROCESSING
(2023)
Article
Physics, Multidisciplinary
Pengtao Song, Xueyi Guo, Kai Xu, Xiaohui Song, Zhan Wang, Zhongcheng Xiang, Hekang Li, Luhong Su, Yirong Jin, Dongning Zheng
Summary: This work presents the fabrication and characterization of Josephson parameter amplifiers (JPA) and their applications in various scientific research fields like quantum computing. A new manufacturing process was utilized to achieve high gain values and amplification bandwidths, leading to successful applications in multi-qubit readout and vacuum state squeezing experiments.
Article
Physics, Multidisciplinary
Sishi Wu, Dengke Zhang, Rui Wang, Yulong Liu, Shuai-Peng Wang, Qichun Liu, J. S. Tsai, Tiefu Li
Summary: A lumped element Josephson parametric amplifier with vacuum-gap-based capacitor is proposed. By engineering the input impedance, it achieves a high gain and quasi quantum-limit noise performance. This design is adaptable for future on-chip integrated quantum computing systems.
Article
Physics, Applied
Yapeng Lu, Wenqu Xu, Quan Zuo, Jiazheng Pan, Xingyu Wei, Junliang Jiang, Zishuo Li, Kaixuan Zhang, Tingting Guo, Shuo Wang, Chunhai Cao, Huabing Wang, Weiwei Xu, Guozhu Sun, Peiheng Wu
Summary: We propose a fishbone-like lumped-element artificial transmission line to overcome impedance mismatch and design a broadband Josephson parametric amplifier suitable for engineering applications of superconducting circuit quantum electrodynamics.
APPLIED PHYSICS LETTERS
(2022)
Article
Nanoscience & Nanotechnology
Guilliam Butseraen, Arpit Ranadive, Nicolas Aparicio, Kazi Rafsanjani Amin, Abhishek Juyal, Martina Esposito, Kenji Watanabe, Takashi Taniguchi, Nicolas Roch, Francois Lefloch, Julien Renard
Summary: This study demonstrates a tunable parametric amplifier using a graphene Josephson junction, with the ability to tune its working frequency widely through gate voltage. The amplifier exhibits a gain exceeding 20 dB and noise performance close to the standard quantum limit. These findings expand the toolset for electrically tunable superconducting quantum circuits and offer opportunities for the development of quantum technologies such as quantum computing and quantum sensing, as well as for fundamental science.
NATURE NANOTECHNOLOGY
(2022)
Article
Physics, Applied
Peng Duan, Zhilong Jia, Chi Zhang, Lei Du, Haoran Tao, Xinxin Yang, Liangliang Guo, Yong Chen, Haifeng Zhang, Zhihao Peng, Weicheng Kong, Hai-Ou Li, Gang Cao, Guo-Ping Guo
Summary: A broad-band flux-pumped Josephson parametric amplifier with an on-chip coplanar waveguide impedance transformer is proposed for scalable quantum processors. The device achieves an operational bandwidth over 600 MHz with a gain above 15 dB, high saturation power, and quantum-limited noise performance. Additionally, its center frequency can be tuned over several hundred megahertz, broadening the effective operational bandwidth to around 1 GHz.
APPLIED PHYSICS EXPRESS
(2021)
Article
Physics, Applied
S. O. Peatain, T. Dixon, P. J. Meeson, J. M. Williams, S. Kafanov, Yu A. Pashkin
Summary: This study presents the simulated performance of a Josephson traveling wave parametric amplifier based on a one-dimensional array of superconducting quantum interference devices. The effects of fabrication tolerances on the amplifier gain are investigated, and an impedance model is proposed to understand the device dynamics. The results have implications for more complex systems and offer the potential for higher amplification and fewer drawbacks.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2023)
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
Physics, Multidisciplinary
Hang Xue, Zhirong Lin, Wenbing Jiang, Zhengqi Niu, Kuang Liu, Wei Peng, Zhen Wang
Summary: A high-performance all-Nb parametric amplifier has been developed for measurements of superconducting quantum information, demonstrating a 20 dB gain over a wide bandwidth and near quantum-limited noise performance. This fabrication process shows potential for designing impedance transformed parametric amplifiers for multiple-qubit readout.
Article
Physics, Multidisciplinary
Martina Esposito, Arpit Ranadive, Luca Planat, Sebastien Leger, Dorian Fraudet, Vincent Jouanny, Olivier Buisson, Wiebke Guichard, Cecile Naud, Jose Aumentado, Florent Lecocq, Nicolas Roch
Summary: This Letter reports the operation of a traveling wave parametric amplifier (TWPA) as a source of two-mode squeezed microwave radiation. The study demonstrates the generation of broadband entanglement between two modes and collective quadrature squeezing.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
V. Yogesh, Prosenjit Maity
Summary: This study investigates the squeezing effect in the interacting qubit-oscillator system with the presence of a parametric oscillator in the Rabi model. The generalized rotating wave approximation is employed to solve the system, showing good agreement between the analytically derived approximate energy spectrum and the numerically determined spectrum. It is found that the squeezing in the oscillator sector decreases with increasing coupling strength.
EUROPEAN PHYSICAL JOURNAL PLUS
(2021)
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
Engineering, Electrical & Electronic
Shigeyuki Miyajima, Taro Yamashita, Masamitsu Tanaka, Naoki Takeuchi, Kunihiro Inomata, Hirotaka Terai
Summary: We developed a process for monolithically integrating nitride superconductor-based superconducting qubits with SFQ-based readout and control circuits. The device structure consists of three superconductive layers, including a Josephson junction made of an NbN/AlN/NbN tri-layer. We successfully fabricated a JJ with a low leakage current and a J(c) of around 50 A/cm(2), and the evaluated sheet inductance exceeded 1 pH.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2023)
Article
Physics, Multidisciplinary
R. Grimaudo, A. S. Magalhaes de Castro, A. Messina, E. Solano, D. Valenti
Summary: This study investigates a two-interacting-qubit quantum Rabi-like model with vanishing transverse fields on the qubit pair. Regardless of the coupling regime, this model can be exactly and unitarily reduced to two independent single-spin quantum Rabi models, where the spin-spin coupling acts as the transverse field. This transformation and the analytical treatment of the single-spin quantum Rabi model are crucial in proving the integrability of our model. The study reveals the existence of different first-order quantum phase transitions characterized by discontinuous two-spin magnetization, mean photon number, and concurrence.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
Yongcheng Ding, Javier Gonzalez-Conde, Lucas Lamata, Jose D. Martin-Guerrero, Enrique Lizaso, Samuel Mugel, Xi Chen, Roman Orus, Enrique Solano, Mikel Sanz
Summary: In this study, a novel approach using a D-Wave quantum annealer is experimentally explored to predict financial crashes in a complex financial network. The performance of the quantum annealer in achieving financial equilibrium is benchmarked. The equilibrium condition of a nonlinear financial model is embedded into a higher-order unconstrained binary optimization (HUBO) problem, which is then transformed into a spin-1/2 Hamiltonian with at most, two-qubit interactions. The problem is equivalent to finding the ground state of an interacting spin Hamiltonian, which can be approximated with a quantum annealer. The experiment paves the way for the codification of this quantitative macroeconomics problem in quantum annealers.
Article
Physics, Multidisciplinary
Jia-Liang Tang, Gabriel Alvarado Barrios, Enrique Solano, Francisco Albarran-Arriagada
Summary: We investigated the tunable control of non-Markovianity in a bosonic mode by coupling it to auxiliary qubits in a thermal reservoir. By considering the Tavis-Cummings model for a single cavity mode and auxiliary qubits, we studied the manipulation of dynamical non-Markovianity with respect to the qubit frequency. Our findings reveal that controlling the auxiliary systems can influence the cavity dynamics as a time-dependent decay rate. Finally, we demonstrate how this tunable time-dependent decay rate can be used to engineer bosonic quantum memristors, which are essential for developing neuromorphic quantum technologies.
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
Physics, Applied
Maximilian Reichert, Quntao Zhuang, Jeffrey H. Shapiro, Roberto Di Candia
Summary: We propose a hetero-homodyne receiver that utilizes cascaded positive operator-valued measurements (POVMs) for quantum illumination target detection. The receiver achieves a 3-dB quantum advantage over classical illumination receivers and provides a significant improvement in performance for quantum radar in the microwave region. This work highlights the potential of cascaded POVMs in quantum radar systems.
PHYSICAL REVIEW APPLIED
(2023)
Article
Physics, Applied
Pranav Chandarana, Narendra N. Hegade, Iraitz Montalban, Enrique Solano, Xi Chen
Summary: We propose a hybrid classical-quantum digitized counterdiabatic algorithm to solve the protein-folding problem on a tetrahedral lattice. Our method outperforms state-of-the-art quantum algorithms using problem-inspired and hardware-efficient variational quantum circuits. We apply our method to proteins with up to nine amino acids, achieving high success probabilities with low-depth circuits on various quantum hardware.
PHYSICAL REVIEW APPLIED
(2023)
Article
Quantum Science & Technology
Uesli Alushi, Tomas Ramos, Juan Jose Garcia-Ripoll, Roberto Di Candia, Simone Felicetti
Summary: The article investigates quadratic light-matter interactions in a waveguide QED system. The authors develop a general scattering theory and discuss paradigmatic examples, revealing fundamental differences with conventional waveguide QED systems.
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
Quantum Science & Technology
Giancarlo Gatti, Daniel Huerga, Enrique Solano, Mikel Sanz
Summary: We propose a protocol to encode classical bits using quantum correlations for a random access code. Measurement contexts built with many-body Pauli observables enable efficient and random access to the encoded data, which is useful for large-data storage with partial retrieval.
Article
Optics
Jie Peng, Jianing Tang, Pinghua Tang, Zhongzhou Ren, Junlong Tian, Nancy Barraza, Gabriel Alvarado Barrios, Lucas Lamata, Enrique Solano, F. Albarran-Arriagada
Summary: In this study, we propose a high-quality deterministic single-photon source that can emit two single photons with any time separation. By utilizing special solutions and adiabatic evolutions, this proposal can be achieved rapidly, taking advantage of the ultrastrong coupling.
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)
