Article
Multidisciplinary Sciences
Emanuele Albertinale, Leo Balembois, Eric Billaud, Vishal Ranjan, Daniel Flanigan, Thomas Schenkel, Daniel Esteve, Denis Vion, Patrice Bertet, Emmanuel Flurin
Summary: Quantum emitters respond to resonant illumination by radiating energy in both coherent and incoherent components. While atoms, molecules, and color centers are typically detected by their fluorescence, electron spins are usually detected through phase-coherent echoes. This study demonstrates the detection of a small ensemble of donor spins in silicon using superconducting quantum devices and highlights the potential of SMPD detection for magnetic resonance spectroscopy of small numbers of spins.
Article
Multidisciplinary Sciences
Aleksey Girich, Sergiy Nedukh, Sergey Polevoy, Kateryna Sova, Sergey Tarapov, Arthur Vakula
Summary: This study reports the achievement of high microwave photon-magnon coupling strength by increasing the spatial concentration of the magnetic component in the electromagnetic field of a planar resonator. The resonator shape was modified to increase the coupling strength by 40%. Numerical simulations and experimental verification confirmed the predicted increase in spatial concentration of the microwave magnetic component and the resulting increase in microwave photon-magnon coupling strength.
SCIENTIFIC REPORTS
(2023)
Article
Multidisciplinary Sciences
Z. Velluire-Pellat, E. Marechal, N. Moulonguet, G. Saiz, G. C. Menard, S. Kozlov, F. Couedo, P. Amari, C. Medous, J. Paris, R. Hostein, J. Lesueur, C. Feuillet-Palma, N. Bergeal
Summary: This study reports the realization of YBa2Cu3O7-delta superconducting coplanar waveguide resonators, and demonstrates the continuous evolution from lossy undercoupled regime to lossless overcoupled regime by adjusting the device geometry. The high-quality factor resonator was used for electron spin resonance measurements, and the spin-cavity hybridization was observed, indicating coherent coupling between the microwave field and the spins. The findings suggest that high-Tc superconducting resonators hold great promise for the development of functional circuits and hybrid quantum systems.
SCIENTIFIC REPORTS
(2023)
Article
Chemistry, Physical
Yuqing Xing, Hui Chen, Bin Hu, Yuhan Ye, Werner A. Hofer, Hong-Jun Gao
Summary: The study demonstrates that the Kondo effect in an iron phthalocyanine single-molecule junction can be reversibly switched on and off using a superconducting Nb tip, by adjusting the tip-sample distance to tune the tunnel coupling at low temperature. Approaching the tip leads to the picking up of the molecule to the tip apex, transferring the geometry of the single-molecule junction into a Nb-FePc-insulator-Au type. The molecule forms an effective magnetic impurity embedded into the superconducting ground states of the Nb tip, switching the out-gap Kondo dip to an in-gap Yu-Shiba-Rusinov state.
Article
Materials Science, Multidisciplinary
Guang-Wei Deng, Loic Henriet, Da Wei, Shu-Xiao Li, Hai-Ou Li, Gang Cao, Ming Xiao, Guang-Can Guo, Marco Schiro, Karyn Le Hur, Guo-Ping Guo
Summary: The Kondo effect involves the screening of a spin-1/2 impurity by a cloud of conduction electrons, forming a many-body Fermi liquid ground state that can interact with light and cause a pi-phase shift in photon signals. The pi-phase shift was observed in a graphene double quantum dot setup within a circuit quantum electrodynamics architecture, and studied in relation to temperature and bias voltage variations. The findings support the presence of a Kondo resonance above the Fermi level and suggest potential applications in light-matter interactions in hybrid circuit systems.
Article
Multidisciplinary Sciences
Joris J. Carmiggelt, Iacopo Bertelli, Roland W. Mulder, Annick Teepe, Mehrdad Elyasi, Brecht G. Simon, Gerrit E. W. Bauer, Yaroslav M. Blanter, Toeno van der Sar
Summary: Quantum sensing is a branch of quantum science and technology that aims to measure physical quantities with high resolution, sensitivity, and dynamic range. In this study, the authors use electron spins in diamond as magnetic field sensors and couple them with a thin-film magnet to achieve broadband microwave detection. They exploit the non-linear spin-wave dynamics of the magnet to convert target microwave signals to the sensor-spin frequency and enable sensing and high-fidelity spin control over a gigahertz bandwidth.
NATURE COMMUNICATIONS
(2023)
Article
Physics, Multidisciplinary
Yanting Cheng, Xin Chen, Ren Zhang
Summary: This study proposes a scheme to detect Kondo physics in a cold atomic system. By manipulating the spin-exchange interaction, the asymmetry in conductivity can be observed, providing evidence for the presence of Kondo physics.
FRONTIERS OF PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Gautam Mitra, Jonathan Z. Low, Sujun Wei, Karol R. Francisco, Michael Definer, Carmen Herrmann, Luis M. Campos, Elke Scheer
Summary: This study reports transport measurements on tunable single-molecule junctions of the organic perchlorotrityl radical molecule, contacted with gold electrodes at low temperature. A subset of junctions shows zero bias anomalies due to the Kondo effect and elevated magnetoresistance. Junctions without Kondo resonance reveal a stronger magnetoresistance. The amplitude of the magnetoresistance can be tuned by mechanically stretching the junction. The high magnetoresistance is attributed to an interference effect involving spin-dependent scattering at the metal-molecule interface, and the Kondo effect is assigned to the unpaired spin located in the center of the molecule in asymmetric junctions.
Article
Physics, Multidisciplinary
Sheng-li Ma, Ji-kun Xie, Ya-long Ren, Xin-ke Li, Fu-li Li
Summary: We propose a method to generate photon-pair blockade in a Josephson-photonics circuit by utilizing a combination of a superconducting charge qubit and two nondegenerate microwave resonators. The two resonators release their energies in the form of strongly correlated pairs of photons when the Josephson frequency matches the resonance frequencies of the qubit and resonators. This study provides a practical approach for producing a bright microwave source of antibunched photon pairs, with potential applications in spectroscopy, metrology, and quantum information processing.
NEW JOURNAL OF PHYSICS
(2022)
Article
Multidisciplinary Sciences
Erik R. Eisenach, John F. Barry, Michael F. O'Keeffe, Jennifer M. Schloss, Matthew H. Steinecker, Dirk R. Englund, Danielle A. Braje
Summary: Overcoming poor readout in solid-state spin defect devices is becoming increasingly urgent, with rapid adoption in quantum sensing, quantum information, and fundamental physics tests. By coupling to a microwave cavity, high-fidelity room-temperature readout of nitrogen-vacancy centers was demonstrated, achieving magnetic sensitivity approaching the Johnson-Nyquist noise limit.
NATURE COMMUNICATIONS
(2021)
Article
Physics, Multidisciplinary
Srivatsan Chakram, Andrew E. Oriani, Ravi K. Naik, Akash V. Dixit, Kevin He, Ankur Agrawal, Hyeokshin Kwon, David I. Schuster
Summary: This study demonstrates a 3D multimode circuit QED system with nine modes in a novel seamless cavity, achieving single photon lifetimes of 2 ms. By developing a flute method, loss is reduced while control over mode spectrum and mode-qubit interaction is enabled.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Applied
Sultan Malik, Wentao Jiang, Felix M. Mayor, Takuma Makihara, Amir H. Safavi-Naeini
Summary: We have achieved strong coupling between gigahertz-frequency nanomechanical resonators and a frequency-tunable superconducting microwave resonator through a galvanically bonded flip-chip method. By tuning the microwave resonator using an external magnetic field, we have observed a series of hybridized microwave-mechanical modes and reported coupling strengths of approximately 15 MHz at cryogenic temperatures. The demonstrated multi-chip approach allows for flexible and rapid characterization and simplified fabrication, potentially enabling coupling between a variety of quantum systems.
APPLIED PHYSICS LETTERS
(2023)
Article
Physics, Multidisciplinary
Catalin Pascu Moca, Ireneusz Weymann, Miklos Antal Werner, Gergely Zarand
Summary: Magnetic impurities in a metal are screened by the Kondo effect, while in a superconductor they lead to quantum phase transition and subgap states. The Kondo cloud is present in both quantum phases, but complete in the screened phase and only partial in the unscreened phase. The compensation value, related to g factor of impurities, can be monitored experimentally by bias spectroscopy.
PHYSICAL REVIEW LETTERS
(2021)
Article
Chemistry, Physical
Qingfeng Zhuang, Xiaoli Wang, Lyuzhou Ye, YiJing Yan, Xiao Zheng
Summary: The spin-polarized scanning tunneling microscope is a versatile tool for probing and manipulating the spintronic properties of atomic and molecular devices with high precision. In this study, a first-principles-based simulation of the control of a Ni-tip/Co/Cu(100) junction was achieved, and a cotunneling mechanism was proposed to explain the physical origin of the observed unconventional Kondo signatures.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Tengfei Hao, Ye Yang, Yaqing Jin, Xiao Xiang, Wei Li, Ninghua Zhu, Ruifang Dong, Ming Li
Summary: Microwave photonics combines photonics and radiofrequency engineering to generate, process, control, and distribute microwave and RF signals. In addition to classic microwave photonic systems, recent research has focused on the cross research between microwave photonics and quantum technology, known as quantum microwave photonics. This emerging field harnesses quantum technology to achieve complex functions that traditional microwave photonic technology cannot accomplish. Selected recent advances in quantum microwave photonics, such as weak microwave signal detection and quantum key distribution, are summarized. However, this field still faces challenges and offers promising future prospects.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
