Article
Chemistry, Multidisciplinary
Sung Un Cho, Wanki Park, Bum-Kyu Kim, Minky Seo, Dongsung T. Park, Hyungkook Choi, Nam Kim, H. -S. Sim, Myung-Ho Bae
Summary: This article proposes a new type of single-electron source with more functionalities compared to existing sources, and achieves the emission of holes and electrons on demand through RF drive. Triangular islands, consistent with the theoretical model, are obtained through quantized current.
Review
Physics, Condensed Matter
Josef Weinbub, Robert Kosik
Summary: Quantum electronics has evolved significantly in recent decades, and the importance of computational methods has become increasingly prominent. Researchers use computational methods to predict, analyze, and design physical processes, devices, and systems, advancing the field of quantum electronics.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2022)
Article
Quantum Science & Technology
Yi-Ping Wang, He Wang
Summary: We propose a theoretical method to study the topological properties of spin-phonon coupled modes in a one-dimensional superconducting resonator lattice. Different topological structures can be displayed by adjusting the coupling parameters, and the topological index of the system's phases can be distinguished.
QUANTUM INFORMATION PROCESSING
(2023)
Article
Chemistry, Physical
D. Wellnitz, G. Pupillo, J. Schachenmayer
Summary: In this study, a simple model for photoinduced electron transfer reactions is examined for many donor-acceptor pairs collectively coupled to a photon mode of a cavity. The research reveals that reaction rates can be enhanced by the cavity under proper resonance conditions, with the largest enhancement potentially occurring in the weak light-matter coupling regime. The study discusses the relevance of the cavity effect in realistic experiments.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Yi-Ping Wang, Wei Wang, Lang Liu, Zhi-Yong Zheng, Meng -En Du
Summary: We theoretically study the topological properties in a one-dimensional superconducting circuit lattice and analyze the energy spectrum and edge states. The number of lattices affects the topological characteristics and the inversion of the edge state distribution can be realized. Considering the effects of defects, dissipation, and disorder, we find that they impact the system but the edge state remains stable due to topological protection.
RESULTS IN PHYSICS
(2022)
Article
Physics, Multidisciplinary
Wen-Long Gao, Lu-Ping Xu, Hua Zhang, Bo Yan, Peng-Xian Li, Gui-Ting Hu
Summary: Quantum radar plays a crucial role in military applications, but the accuracy of one-shot quantum illumination is limited by measurement noises. This study proposes a new optical probe source using a Hong-Ou-Mandel interferometer to align two photons in time, achieving one-shot detection and significantly improving accuracy.
Article
Quantum Science & Technology
Derek Michael Forrester, Fedor Vasilievich Kusmartsev
Summary: An electron can function both as a particle and a probability wave, allowing for control and design of electronic devices similar to those based on light. This study focuses on the splitting of electron wavefunctions in systems with Dirac-type physics, such as graphene and topological insulators, analyzing electron beam-splitters, superfocusers, and nanoribbon propagation. The findings highlight the importance of balancing waveform, system geometry, and energies to maximize the probability density and lifetime of flying electrons, contributing to the development of quantum electron optics.
ADVANCED QUANTUM TECHNOLOGIES
(2023)
Article
Quantum Science & Technology
Mark D. Blumenthal, Declan Mahony, Salahuddeen Ahmad, Dominique Gouveia, Hume Howe, Harvey E. Beere, Thomas Mitchel, Dave A. Ritchie, Michael Pepper
Summary: This study presents a highly quantized current pump mechanism that can pump multiple electrons in a single cycle. Experimental results show that increasing the electron throughput does not significantly degrade the accuracy of the produced current. The pump mechanism utilizes an aluminum gallium arsenide two-dimensional electron gas and a one-dimensional split-gate confinement potential, driven by an applied source-drain voltage and a trapezoidal waveform. This pump mechanism can reliably pump multiple integer numbers of electrons without the need for a magnetic field.
EPJ QUANTUM TECHNOLOGY
(2023)
Article
Optics
Ariadna Soro, Carlos Sanchez Munoz, Anton Frisk Kockum
Summary: The interaction between two giant atoms mediated by a structured waveguide is studied. Decoherence-free interaction is possible inside the energy band but degraded due to time delay and non-Markovian effects. Outside the band, giant atoms can interact more strongly and over longer distances compared to small atoms.
Article
Optics
Suirong He, Yufen Li, L. F. Wei
Summary: This study investigates the transport of photons between two cavities and demonstrates how the coupling strength between the cavities can be adjusted by manipulating the atomic levels in an ensemble, resulting in EIT-like effects.
Article
Quantum Science & Technology
B. Roussel, C. Cabart, G. Feve, P. Degiovanni
Summary: Recent developments in coherent manipulation of electrons in ballistic conductors have led to the generation of time-periodic electrical currents involving one to few electronic excitations per period. In order to utilize individual electrons as carriers of quantum information for flying qubit computation or quantum metrology applications, a general method is needed to unravel the single-particle excitations embedded in a quantum electrical current and how quantum information is encoded within it.
Article
Chemistry, Multidisciplinary
Dennis Schaefter, Jonathan Wischnat, Lorenzo Tesi, J. Alejandro De Sousa, Edmund Little, Jake McGuire, Marta Mas-Torrent, Concepcio Rovira, Jaume Veciana, Floriana Tuna, Nuria Crivillers, Joris van Slageren
Summary: In this article, the spin dynamics of chlorinated triphenylmethyl organic radicals were investigated, revealing long ensemble coherence times and the achievement of two-qubit and individual qubit addressability in the biradical system. These results highlight the potential of molecular materials in the development of quantum architectures.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Dennis Schaefter, Jonathan Wischnat, Lorenzo Tesi, J. Alejandro De Sousa, Edmund Little, Jake McGuire, Marta Mas-Torrent, Concepcio Rovira, Jaume Veciana, Floriana Tuna, Nuria Crivillers, Joris van Slageren
Summary: General-purpose quantum computation and quantum simulation require precise and robust interqubit interactions in multi-qubit architectures, along with local addressability. Molecular systems, such as chlorinated triphenylmethyl organic radicals, show promise for large-scale quantum architectures due to their high degree of positionability and tailorability of interqubit interactions. This study demonstrates extraordinarily long coherence times up to 148 μs in the investigated molecular materials at temperatures below 100 K, and also showcases two-qubit and individual qubit addressability in the biradical system. These findings highlight the potential of molecular materials for the development of quantum architectures.
ADVANCED MATERIALS
(2023)
Article
Quantum Science & Technology
Nicola Biagi, Saverio Francesconi, Manuel Gessner, Marco Bellini, Alessandro Zavatta
Summary: A remote phase sensing scheme is proposed and experimentally tested, showing a sensitivity that scales with the intensity of the local coherent states.
ADVANCED QUANTUM TECHNOLOGIES
(2022)
Article
Chemistry, Multidisciplinary
Ron Ruimy, Alexey Gorlach, Gefen Baranes, Ido Kaminer
Summary: We investigate the interaction between a free electron and a group of identical optical emitters. The coherence and correlations among the emitters can strengthen the interaction with each electron and affect its energy spectrum. We propose methods to achieve such collective interactions. As an application, we study the interaction between free electrons and superradiant systems, demonstrating how electrons can probe the ultrafast population dynamics of superradiance.
Article
Engineering, Electrical & Electronic
Karim Kassan, Haifa Fares, D. Christian Glattli, Yves Louet
Summary: This study analyzes the performance of continuous phase modulation in generating a single-sideband spectrum and proposes a method for designing modulation schemes through multi-objective optimization.
IEEE TRANSACTIONS ON COMMUNICATIONS
(2021)
Article
Physics, Multidisciplinary
A. Assouline, M. Jo, P. Brasseur, K. Watanabe, T. Taniguchi, Th. Jolicoeur, D. C. Glattli, N. Kumada, P. Roche, F. D. Parmentier, P. Roulleau
Summary: Magnons can transfer magnetic moment or spin over long distances. In quantum Hall ferromagnets, it is predicted that spin and charge are entangled, resulting in magnons carrying an electric dipole moment. Evidence of this electric dipole moment is found in a graphene quantum Hall ferromagnet using a Mach-Zehnder interferometer, with the magnons affecting interferometer flux and interference pattern phase and visibility. The ability to couple spin degree of freedom to an electrostatic potential in quantum Hall ferromagnets could have implications for spintronics.
Article
Materials Science, Multidisciplinary
A. Pierret, D. Mele, H. Graef, J. Palomo, T. Taniguchi, K. Watanabe, Y. Li, B. Toury, C. Journet, P. Steyer, V Garnier, A. Loiseau, J-M Berroir, E. Bocquillon, G. Feve, C. Voisin, E. Baudin, M. Rosticher, B. Placais
Summary: This study aims to refine the dielectric characterization of hexagonal boron nitride (hBN) in terms of low-field permittivity and high-field strength and conductivity. The results show that hBN has a low-field dielectric constant of around 3.4 and follows the Frenkel-Pool law for current leakage at high-field, with similar dielectric constant and trap energy as standard technologically relevant dielectrics.
MATERIALS RESEARCH EXPRESS
(2022)
Article
Multidisciplinary Sciences
I Taktak, M. Kapfer, J. Nath, P. Roulleau, M. Acciai, J. Splettstoesser, I Farrer, D. A. Ritchie, D. C. Glattli
Summary: In this study, a novel interferometric approach was used to demonstrate that anyons maintain quantum coherence while propagating. The results have positive implications for achieving controlled quantum coherent braiding of anyons.
NATURE COMMUNICATIONS
(2022)
Article
Multidisciplinary Sciences
M. Jo, June-Young M. Lee, A. Assouline, P. Brasseur, K. Watanabe, T. Taniguchi, P. Roche, D. C. Glattli, N. Kumada, F. D. Parmentier, H-S Sim, P. Roulleau
Summary: Efforts have been made to understand and control decoherence in 2D electron systems, with graphene offering a unique opportunity to study unexplored regimes of electron interferometry. A graphene quantum Hall PN junction exhibits a remarkable crossover from exponential decay to algebraic decay of interference visibility as temperature decreases, a previously unobserved phenomenon in GaAs interferometers.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Multidisciplinary
A. Schmitt, P. Vallet, D. Mele, M. Rosticher, T. Taniguchi, K. Watanabe, E. Bocquillon, G. Feve, J. M. Berroir, C. Voisin, J. Cayssol, M. O. Goerbig, J. Troost, E. Baudin, B. Placais
Summary: Researchers have achieved a mesoscopic variant of the Schwinger effect in graphene transistors, which involves the creation of matter by electric fields. By conducting transport measurements, they observed universal one-dimensional Schwinger conductance at the pinch-off of the transistors. These findings enhance our understanding of current saturation limits in ballistic graphene and open up new directions for quantum electrodynamic experiments in the laboratory.
Article
Physics, Multidisciplinary
H. Bartolomei, R. Bisognin, H. Kamata, J. -M. Berroir, E. Bocquillon, G. Menard, B. Placais, A. Cavanna, U. Gennser, Y. Jin, P. Degiovanni, C. Mora, G. Feve
Summary: This paper reports on the squeezing of bosonic edge magnetoplasmon modes in a quantum Hall conductor, whose characteristic impedance is determined by the quantum of resistance (RK 25 kS2), offering the possibility of enhanced coupling to low-dimensional quantum conductors. By applying a combination of dc and ac drives to a quantum point contact, squeezing is demonstrated and a noise reduction of 18% below vacuum fluctuations is observed, indicating the achievement of squeezing in a low impedance environment. The level of squeezing can be improved by using more complex conductors, such as ac driven quantum dots or mesoscopic capacitors.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
M. Ruelle, E. Frigerio, J. -M. Berroir, B. Placais, J. Rech, A. Cavanna, U. Gennser, Y. Jin, G. Feve
Summary: Recent anyon collision experiments have shown the ability to distinguish between fermionic and anyonic statistics. However, only one type of anyons associated with the Laughlin state at filling factor nu = 1/3 has been studied so far. It is important to establish anyon collisions as quantitative probes for more complex topological orders and different species of anyons. In this study, we compare the Laughlin nu = 1/3 state with the Jain nu = 2/5 state, and demonstrate the robustness of anyon collision signals for anyons of the same type while also showing the ability to distinguish between different species of anyons. Our results indicate the influence of interchannel interactions in anyon collision experiments with multiple edge channels.
Article
Materials Science, Multidisciplinary
A. Schmitt, D. Mele, M. Rosticher, T. Taniguchi, K. Watanabe, C. Maestre, C. Journet, V. Garnier, G. Feve, J. M. Berroir, C. Voisin, B. Placais, E. Baudin
Article
Materials Science, Multidisciplinary
Matteo Acciai, Preden Roulleau, Imen Taktak, D. Christian Glattli, Janine Splettstoesser
Summary: This article investigates an electronic Hong-Ou-Mandel interferometer in the integer quantum Hall regime, where voltage pulses are used to generate colliding electronic states. The aim is to explore possible mechanisms that lead to a reduced visibility of the Pauli dip, which is the expected noise suppression for synchronized sources. It is found that the mixing of copropagating edge channels due to tunneling events between them can result in a reduced visibility of the Pauli dip.
Article
Computer Science, Information Systems
Karim Kassan, Haifa Fares, D. Christian Glattli, Yves Louet
Summary: This paper investigated the PAM decomposition of a type of CPM signal with single-side band property. The PAM decomposition was used as a convenient solution to provide a large reduced complexity trellis detection to approach the theoretical optimal performance. An algorithm was developed to obtain the necessary PAM pulses to approach the optimal performance bound using suboptimal receivers. The proposed demodulation system exhibited excellent performance with minimal complexity compared to the MLSD optimal receiver.
