Article
Chemistry, Multidisciplinary
Daisy R. S. Pooler, Anouk S. Lubbe, Stefano Crespi, Ben L. Feringa
Summary: This article focuses on the key aspects of motor design, discussing how to manipulate these properties without impeding motor integrity, and provides a comprehensive evaluation of all artificial light-driven rotary motor scaffolds currently present in the literature.
Article
Chemistry, Organic
Cosima Stahler, Daisy R. S. Pooler, Romain Costil, Dhruv Sudan, Pieter van der Meulen, Ryojun Toyoda, Ben L. Feringa
Summary: This study demonstrates the coupling motion between the rocking motion of a dihydroanthracene stator and the light-induced rotational movement of an overcrowded alkene-based molecular motor. The structures of two diastereomers with opposite axial chirality were analyzed using NMR and X-ray analysis. The study also reveals the possibility of regulating the rotational speed of the motor through functionalization and extends the understanding of the motor's photochemical behavior.
JOURNAL OF ORGANIC CHEMISTRY
(2022)
Article
Engineering, Mechanical
Zhiyang Gu, Chengli Fan, Dengxiu Yu, Zhen Wang
Summary: A distributed optimal control algorithm based on adaptive neural network is proposed for the synchronized control problem of a class of second-order nonlinear coupled harmonic oscillators. By establishing the coupling relationship, fitting the unknown nonlinearity, designing virtual and actual controllers, and designing cost and HJB functions, the optimal consistent control of the oscillators is achieved.
NONLINEAR DYNAMICS
(2023)
Article
Astronomy & Astrophysics
Sayantan Choudhury, Rakshit Mandish Gharat, Saptarshi Mandal, Nilesh Pandey, Abhishek Roy, Partha Sarker
Summary: In this work, we investigate the effects of a quantum quench on the entanglement measures of a coupled oscillator system and provide analytical and numerical results. The study reveals that the entanglement measures exhibit different behaviors with respect to the coupling strength and time periods.
Article
Physics, Multidisciplinary
Marta Pita-Vidal, Arno Bargerbos, Rok Zitko, Lukas J. Splitthoff, Lukas Grunhaupt, Jaap J. Wesdorp, Yu Liu, Leo P. Kouwenhoven, Ramon Aguado, Bernard van Heck, Angela Kou, Christian Kraglund Andersen
Summary: Spin qubits in semiconductors are a promising platform for scalable quantum computing devices, but achieving multiqubit interactions over extended distances is challenging. Superconducting spin qubits encoded in Andreev levels provide an alternative with intrinsic spin-supercurrent coupling. This study demonstrates an electrostatically defined quantum dot Josephson junction with a spin-split doublet ground state, allowing for qubit manipulation and investigating the qubit performance using direct spin manipulation. Coupling the Andreev spin qubit with a superconducting transmon qubit shows strong coherent qubit-qubit coupling, a crucial step towards a hybrid architecture combining the advantages of both superconducting and semiconductor qubits.
Article
Engineering, Mechanical
R. Kabilan, A. Venkatesan
Summary: Vibration analysis is a dominant technique in predictive maintenance for analyzing the performance of engineering systems. The study of vibrational resonance is important for engineering design and ensuring desired system behavior.
JOURNAL OF VIBRATION ENGINEERING & TECHNOLOGIES
(2023)
Article
Optics
Roson Nongthombam, Sampreet Kalita, Amarendra K. Sarma
Summary: We investigate the synchronization between a superconducting qubit and an external optical field in a hybrid electrooptomechanical system using the quantum trajectory method. Bistability is observed in the qubit's polarization vector, where the qubit rotates around the vector. With an increased number of trajectories, the qubit no longer displays bistability but still shows synchronization with reduced quantum fluctuations. This scheme can be applied for preparing and monitoring the state of the microwave qubit to an optical photon, which has potential applications in long-distance quantum communication. Additionally, it provides a platform for studying quantum synchronization.
Article
Optics
Chang-Woo Lee, Jae Hoon Lee, Jaewoo Joo, Hyojun Seok
Summary: This study investigates the enhancement in sensitivity when measuring a weak force using the optical response of an optomechanical oscillator driven by squeezed light. The results show that squeezed state inputs can achieve noise levels below the standard quantum limit and even the Heisenberg limit in specific regimes, opening new pathways for enhanced quantum sensing with optomechanical systems in measuring various physical quantities.
Article
Multidisciplinary Sciences
E. Bolandhemmat, F. Kheirandish
Summary: In this paper, we analyze a parametric oscillator with both mass and frequency time-dependent, and show that its evolution operator can be obtained from another parametric oscillator with constant mass and time-dependent frequency followed by a time transformation. We then investigate the quantum dynamics of a parametric oscillator with unit mass and time-dependent frequency in a Kerr medium under the influence of a time-dependent force. The characteristics and statistical properties of the generated states are studied by calculating the autocorrelation function, the Mandel Q parameter, and the Husimi Q-function.
SCIENTIFIC REPORTS
(2023)
Article
Optics
Mikhail Tokman, Alex Behne, Brandon Torres, Maria Erukhimova, Yongrui Wang, Alexey Belyanin
Summary: In this study, we investigate the quantum dynamics of many-qubit systems strongly coupled to a quantized electromagnetic cavity field in the presence of decoherence and dissipation. The varying coupling strength of different qubits to the cavity field and the spread of their transition frequencies are taken into account. We derive compact analytic solutions for time-dependent quantum state amplitudes and observables for a broad class of open quantum systems using the stochastic Schrodinger equation approach. Depending on the initial quantum state preparation, we demonstrate that an ensemble of qubits can evolve into a rich variety of many-qubit entangled states with destructive or constructive interference between the qubits. Specifically, when only a small fraction of qubits are initially excited, the dissipation in a cavity will inevitably drive the system into robust dark states that are completely decoupled from the cavity and have much longer lifetimes than the decay time of the cavity field. Furthermore, we identify the conditions under which coherent coupling to the quantized cavity field overcomes the dephasing caused by a spread of transition frequencies in multiqubit systems and leads to the formation of a decoupled dark state.
Article
Optics
Pu Wang, Lixin He, Yanqing He, Siqi Sun, Ruxuan Liu, Baoning Wang, Pengfei Lan, Peixiang Lu
Summary: In this study, we theoretically investigate the formation of high-order fractional alignment echo in OCS molecules and analyze the intricate dependence of echo intensity on laser conditions. Through analysis with rotational density matrix, we demonstrate that the complex dependence arises from interference of multiple quantum pathways involving multilevel rotational transitions. The results provide a comprehensive multilevel picture of quantum dynamics in molecular ensembles for the development of rotational echo spectroscopy.
Article
Optics
Dolan Krishna Bayen, Swapan Mandal
Summary: This paper discusses a single mode of the quantized electromagnetic field coupled to a nonlinear medium and derives the solution of a two-photon anharmonic oscillator with a periodically driven term. The influence of the driven term on amplitude squared squeezing and photon antibunching is clearly indicated in the results.
APPLIED PHYSICS B-LASERS AND OPTICS
(2021)
Article
Mathematics
R. A. Alharbey, H. Abusamra
Summary: The nature of spectral lines of emitted radiation by a non-dissipative single-mode quantized harmonic oscillator with n-chirped Gaussian pulses was investigated. The transient emitted spectrum was analyzed using the Haar wavelet and Morlet wavelet functions of the radiation detector. The computational display of the analytical results demonstrated how the driving pulse parameters can shape the detected emitted spectrum as desired.
Article
Multidisciplinary Sciences
Onat Arisoy, Ozgur E. Mustecaplioglu
Summary: In this study, a few-qubit system is proposed as a compact quantum refrigerator to cool an interacting multi-qubit system. By using a spin-star model to prepare refrigerant qubits, a collisional route to thermalization can effectively cool the many-qubit system. The operation cost and cooling efficiency of a simple refrigeration cycle can be controlled by parameters such as the number of ancilla qubits and the qubit-qubit interaction strength, and bounds on achievable temperature are established.
SCIENTIFIC REPORTS
(2021)
Article
Mathematics
Dmitry Makarov
Summary: The coupled quantum harmonic oscillator, an important model system in quantum optics and quantum informatics, has been widely studied for quantum entanglement. This research demonstrates that the system of coupled harmonic oscillators interacting with two independent particles has an exact analytical solution to the dynamic Schrodinger equation, revealing the main parameters of the system.
Article
Engineering, Electrical & Electronic
A. V. Chumak, P. Kabos, M. Wu, C. Abert, C. Adelmann, A. O. Adeyeye, J. Akerman, F. G. Aliev, A. Anane, A. Awad, C. H. Back, A. Barman, G. E. W. Bauer, M. Becherer, E. N. Beginin, V. A. S. V. Bittencourt, Y. M. Blanter, P. Bortolotti, I. Boventer, D. A. Bozhko, S. A. Bunyaev, J. J. Carmiggelt, R. R. Cheenikundil, F. Ciubotaru, S. Cotofana, G. Csaba, O. V. Dobrovolskiy, C. Dubs, M. Elyasi, K. G. Fripp, H. Fulara, I. A. Golovchanskiy, C. Gonzalez-Ballestero, P. Graczyk, D. Grundler, P. Gruszecki, G. Gubbiotti, K. Guslienko, A. Haldar, S. Hamdioui, R. Hertel, B. Hillebrands, T. Hioki, A. Houshang, C. -M. Hu, H. Huebl, M. Huth, E. Iacocca, M. B. Jungfleisch, G. N. Kakazei, A. Khitun, R. Khymyn, T. Kikkawa, M. Klaui, O. Klein, J. W. Klos, S. Knauer, S. Koraltan, M. Kostylev, M. Krawczyk, I. N. Krivorotov, V. V. Kruglyak, D. Lachance-Quirion, S. Ladak, R. Lebrun, Y. Li, M. Lindner, R. Macedo, S. Mayr, G. A. Melkov, S. Mieszczak, Y. Nakamura, H. T. Nembach, A. A. Nikitin, S. A. Nikitov, V. Novosad, J. A. Otalora, Y. Otani, A. Papp, B. Pigeau, P. Pirro, W. Porod, F. Porrati, H. Qin, B. Rana, T. Reimann, F. Riente, O. Romero-Isart, A. Ross, A. V. Sadovnikov, A. R. Safin, E. Saitoh, G. Schmidt, H. Schultheiss, K. Schultheiss, A. A. Serga, S. Sharma, J. M. Shaw, D. Suess, O. Surzhenko, K. Szulc, T. Taniguchi, M. Urbanek, K. Usami, A. B. Ustinov, T. van der Sar, S. van Dijken, V. I. Vasyuchka, R. Verba, S. Viola Kusminskiy, Q. Wang, M. Weides, M. Weiler, S. Wintz, S. P. Wolski, X. Zhang
Summary: Magnonics is a discipline that explores the physical properties of spin waves and utilizes them for data processing. It offers several advantages, such as scalability to atomic dimensions, operation in high-frequency ranges, utilization of nonlinear and nonreciprocal phenomena, and compatibility with CMOS technology. Although primarily in the academic domain, extensive research is being conducted to address the scientific and technological challenges, with several proof-of-concept prototypes already realized in laboratories.
IEEE TRANSACTIONS ON MAGNETICS
(2022)
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
Optics
William Loh, Dave Kharas, Ryan Maxson, Gavin N. West, Alexander Medeiros, Danielle Braje, Paul W. Juodawlkis, Robert McConnell
Summary: Photonically integrated resonators have the potential to enable compact ultranarrow linewidth lasers. This study demonstrates an integrated stimulated Brillouin scattering (SBS) laser based on a large mode-volume annulus resonator, achieving an ultranarrow thermal-noise-limited linewidth of 270 Hz. By utilizing a thermorefractive noise suppression technique, the linewidth is further reduced to 70 Hz.
Article
Physics, Applied
Reginald Wilcox, Erik Eisenach, John Barry, Matthew Steinecker, Michael O'Keeffe, Dirk Englund, Danielle Braje
Summary: Quantum sensors based on spin defect ensembles have achieved rapid development by utilizing a nonoptical state preparation technique and microwave cavity readout technique, resulting in a nonoptical sensor architecture that is applicable to all solid-state paramagnetic defects with a zero-field splitting.
PHYSICAL REVIEW APPLIED
(2022)
Article
Quantum Science & Technology
Sandoko Kosen, Hang-Xi Li, Marcus Rommel, Daryoush Shiri, Christopher Warren, Leif Gronberg, Jaakko Salonen, Tahereh Abad, Janka Biznarova, Marco Caputo, Liangyu Chen, Kestutis Grigoras, Goran Johansson, Anton Frisk Kockum, Christian Krizan, Daniel Perez Lozano, Graham J. Norris, Amr Osman, Jorge Fernandez-Pendas, Alberto Ronzani, Anita Fadavi Roudsari, Slawomir Simbierowicz, Giovanna Tancredi, Andreas Wollraff, Christopher Eichler, Joonas Govenius, Jonas Bylander
Summary: This paper investigates the integration of single and coupled superconducting transmon qubits into flip-chip modules and presents high coherence times and gate fidelities. This integration technique can be used to realize quantum processors with hundreds of qubits.
QUANTUM SCIENCE AND TECHNOLOGY
(2022)
Article
Physics, Multidisciplinary
Guoqing Wang, Yi-Xiang Liu, Jennifer M. Schloss, Scott T. Alsid, Danielle A. Braje, Paola Cappellaro
Summary: This study develops a technique for sensing arbitrary-frequency signals using quantum sensors as quantum frequency mixers, enabling a variety of sensing applications.
Article
Instruments & Instrumentation
Mats O. Tholen, Riccardo Borgani, Giuseppe Ruggero Di Carlo, Andreas Bengtsson, Christian Krizan, Marina Kudra, Giovanna Tancredi, Jonas Bylander, Per Delsing, Simone Gasparinetti, David B. Haviland
Summary: This paper introduces a digital microwave platform called Presto, which is designed for measuring and controlling multiple quantum bits. Presto utilizes direct digital synthesis to create signals and analyze responses on its ports. It has various features, including digital triggers, continuous-wave outputs, and DC-bias outputs. The scalability of Presto allows for experiments with a large number of qubits. The authors also demonstrate the capabilities of Presto in experiments involving two superconducting qubits.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2022)
Article
Physics, Applied
Anita Fadavi Roudsari, Daryoush Shiri, Hampus Renberg Nilsson, Giovanna Tancredi, Amr Osman, Ida-Maria Svensson, Marina Kudra, Marcus Rommel, Jonas Bylander, Vitaly Shumeiko, Per Delsing, Per Delsing
Summary: We present the implementation of a traveling-wave parametric amplifier using three-wave mixing (3WM) that achieves near-quantum-limited performance. By utilizing superconducting nonlinear asymmetric inductive element (SNAIL) loops biased with a dc magnetic flux, we enhance the amplification by 3WM. Furthermore, we incorporate dispersion engineering features to create a stop-band at the pump's second harmonic and suppress the higher harmonics, resulting in improved amplification. With a chain of 440 SNAILs, the amplifier achieves up to 20 dB gain and a 3-dB bandwidth of 1 GHz. The added noise by the amplifier is found to be less than one photon.
APPLIED PHYSICS LETTERS
(2023)
Article
Physics, Applied
Tsuyoshi Takahashi, Norinao Kouma, Yoshiyasu Doi, Shintaro Sato, Shuhei Tamate, Yasunobu Nakamura
Summary: This study reveals that the junction-resistance of Al/AlOx/Al Josephson structures can be affected by the metal deposition during shadow evaporation, and a two-step shadow evaporation method is introduced to reduce the resistance variation, which shows promise for the development of large-scale superconducting quantum computers.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2023)
Article
Chemistry, Physical
Phalgun Lolur, Marten Skogh, Werner Dobrautz, Christopher Warren, Janka Biznarova, Amr Osman, Giovanna Tancredi, Goran Wendin, Jonas Bylander, Martin Rahm
Summary: This work introduces a strategy called reference-state error mitigation (REM) for quantum chemistry, which can be implemented on current and near-term devices. REM can be applied alongside existing mitigation procedures with minimal post-processing and additional measurements. The method is designed for the variational quantum eigensolver and shows significant improvement in the computational accuracy of ground state energies of small molecules on superconducting quantum hardware. Simulations of noisy circuits with a depth exceeding 1000 two-qubit gates demonstrate the scalability of the method.
JOURNAL OF CHEMICAL THEORY AND COMPUTATION
(2023)
Article
Physics, Applied
John F. Barry, Reed A. Irion, Matthew H. Steinecker, Daniel K. Freeman, Jessica J. Kedziora, Reginald G. Wilcox, Danielle A. Braje
Summary: Quantum sensors based on a ferrimagnetic sensing element in an oscillator architecture offer a compact and efficient solution for high-performance magnetometry. The device demonstrates a fixed and calibration-free response, with submegahertz transition linewidths and a sensitivity below 200 fT/root Hz over a 1 MHz bandwidth. By encoding magnetic field in frequency, it provides a dynamic range in excess of 1 mT, while its passive thermal initialization greatly reduces power requirements compared to laser-initialized sensors. With further development, this device shows promise for applications outside the laboratory, and the oscillator architecture offers advantages across various sensing platforms.
PHYSICAL REVIEW APPLIED
(2023)
Article
Physics, Applied
Scott T. Alsid, Jennifer M. Schloss, Matthew H. Steinecker, John F. Barry, Andrew C. Maccabe, Guoqing Wang, Paola Cappellaro, Danielle A. Braje
Summary: This study demonstrates a high-performance magnetometer that can detect microwave fields near 2.87 GHz with a sensitivity of 3.4 pT/i/Hz, using techniques adapted from low-frequency quantum sensors. The results increase the potential of N-V ensembles to be used as microwave circuitry imagers and near-field probes of antennas.
PHYSICAL REVIEW APPLIED
(2023)
Article
Quantum Science & Technology
Liangyu Chen, Hang-Xi Li, Yong Lu, Christopher W. Warren, Christian J. Krizan, Sandoko Kosen, Marcus Rommel, Shahnawaz Ahmed, Amr Osman, Janka Biznarova, Anita Fadavi Roudsari, Benjamin Lienhard, Marco Caputo, Kestutis Grigoras, Leif Groenberg, Joonas Govenius, Anton Frisk Kockum, Per Delsing, Jonas Bylander, Giovanna Tancredi
Summary: High-fidelity and rapid readout of qubit state is crucial for quantum computing and communication, and a prerequisite for quantum error correction. We propose a readout scheme for superconducting qubits that combines a shelving technique and two-tone excitation of the readout resonator. Using a machine-learning algorithm to post-process the measurement results further improves the fidelity of qubit-state assignment. We demonstrate single-shot frequency-multiplexed qubit readout with a 140 ns readout time and achieve high assignment fidelity without using a quantum-limited amplifier.
NPJ QUANTUM INFORMATION
(2023)
Article
Materials Science, Multidisciplinary
Hiroki Ikegami, Yasunobu Nakamura
Summary: This research presents experimental investigations of transport properties in the insulating phase of two-dimensional Josephson-junction arrays (JJAs). The results indicate that the JJAs exhibit nonlinear current-voltage characteristics at low temperatures, and the crossover temperature to the insulating phase and the phase diagram in the insulating side are determined through the analysis of nonlinearity.
Article
Quantum Science & Technology
Marina Kudra, Mikael Kervinen, Ingrid Strandberg, Shahnawaz Ahmed, Marco Scigliuzzo, Amr Osman, Daniel Perez Lozano, Mats O. Tholen, Riccardo Borgani, David B. Haviland, Giulia Ferrini, Jonas Bylander, Anton Frisk Kockum, Fernando Quijandria, Per Delsing, Simone Gasparinetti
Summary: This research demonstrates a successful method for generating high-fidelity Wigner-negative states in a three-dimensional microwave cavity. Various states useful for quantum computation, including Schrodinger-cat states, binomial states, Gottesman-Kitaev-Preskill states, and cubic phase states, are achieved. The optimization of SNAP gates and displacements, as well as control of pulse envelopes, ensures robustness against system parameter fluctuations.
