Article
Physics, Multidisciplinary
John Clai Owens, Margaret G. Panetta, Brendan Saxberg, Gabrielle Roberts, Srivatsan Chakram, Ruichao Ma, Andrei Vrajitoarea, Jonathan Simon, David Schuster
Summary: This study explores the cavity quantum electrodynamics of a transmon qubit in a topologically nontrivial Harper-Hofstadter lattice. By breaking time-reversal symmetry, the study achieves spectral resolution of the individual bulk and edge modes of the lattice, observes oscillations between the excited transmon and each mode, and measures the synthetic-vacuum-induced Lamb shift of the transmon. Furthermore, the study demonstrates the ability to count individual photons within each mode of the topological band structure using the transmon.
Article
Optics
Yusef Maleki, Marlan O. Scully, Aleksei M. Zheltikov
Summary: In this study, a closed-form analytical description for the metrological performance of a generic superposition of spin coherent states (SSCS) used as probes for quantum phase estimation was presented. Transparent analytical expressions for the quantum Fisher information were derived, identifying a general class of spin coherent states capable of quantum metrology with Heisenberg-limit precision. Analysis of antipodal SSCS on the Bloch sphere revealed that phase-estimation precision increases with distance from the equator, reaching the Heisenberg limit for SSCS represented as superpositions of the poles.
Article
Optics
Asha Devi, Sarath D. Gunapala, Malin Premaratne
Summary: A new cavity quantum electrodynamic system is proposed, focusing on the strong coupling between the cavity and atom, and the influence of external drives on higher energy levels. The study shows that intracavity photon numbers can be enhanced even without population inversion under certain conditions.
Article
Quantum Science & Technology
Kashif Ammar Yasir, Lin Zhuang, Wu-Ming Liu
Summary: We investigate topological nonlinear optics with spin-orbit coupled Bose-Einstein condensate in a cavity and demonstrate different types of optical transparencies and the formation of topological edge states through quantum interference. These findings are significant for topological photonics and their application in quantum computation.
NPJ QUANTUM INFORMATION
(2022)
Article
Multidisciplinary Sciences
M. Hays, V Fatemi, D. Bouman, J. Cerrillo, S. Diamond, K. Serniak, T. Connolly, P. Krogstrup, J. Nygard, A. Levy Yeyati, A. Geresdi, M. H. Devoret
Summary: Researchers combined the advantages of semiconductor spin qubits and superconducting electrodynamic qubits to create the Andreev spin qubit, achieving coherent spin manipulation and discovering spin-flip time and spin coherence time.
Article
Physics, Multidisciplinary
Julien Vaneecloo, Sebastien Garcia, Alexei Ourjoumtsev
Summary: We demonstrate a new versatile building block for optical quantum technologies, combining cavity quantum electrodynamics and interacting atomic ensembles to achieve deterministic quantum engineering of light.
Article
Chemistry, Physical
Braden M. Weight, Todd D. Krauss, Pengfei Huo
Summary: Coupling molecules to the quantized radiation field inside an optical cavity creates new photon-matter hybrid states called polariton states. We investigate molecular polaritons using ab initio simulations by combining electronic structure theory with quantum electrodynamics (QED). This parametrized QED approach provides exact molecule-cavity interactions, limited by approximations made in the electronic structure. Our demonstrated accuracy and selected applications in light-harvesting and light-emitting materials suggest that this framework can be a powerful tool for simulating exciton polaritons in molecule-cavity hybrid systems.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Lukas Liensberger, Franz X. Haslbeck, Andreas Bauer, Helmuth Berger, Rudolf Gross, Hans Huebl, Christian Pfleiderer, Mathias Weiler
Summary: The experiment focused on the tunability of cooperativity in coupled spin-cavity systems by changing the magnetic state of the spin system using an external control parameter. The model system used was Cu2OSeO3 material coupled to a microwave cavity resonator, showing a strong tunability of the normalized coupling rate by magnetic field. The results allow for changing the magnon-photon cooperativity from 1 to 60 at the phase boundaries of the skyrmion lattice state.
Article
Optics
Yaxing Zhang, Jacob C. Curtis, Christopher S. Wang, R. J. Schoelkopf, S. M. Girvin
Summary: This paper investigates the effect of off-resonant drive on the nonlinearities of cavity modes coupled to transmon ancillas. The study shows that the drive can induce multiphoton resonances among cavity and transmon excitations, leading to strong modification of cavity nonlinearities. It also demonstrates that the cavity Kerr nonlinearity relates to the third-order nonlinear susceptibility function of the driven ancilla, providing a numerically efficient way of computing the cavity Kerr. Furthermore, the paper proposes a method to dynamically correct the cavity Kerr nonlinearity using a single off-resonant transmon drive.
Article
Physics, Applied
Ugur Meric Gur, Michael Mattes, Samel Arslanagic, Niels Gregersen
Summary: In this study, the performance of a micropillar cavity single-photon source with an elliptical cross section was numerically investigated. It was found that while the ellipticity helps establish polarization control of emitted photons, there is a trade-off with reduced coupling to a Gaussian profile in the far field and the need for increased pumping power. Optimum geometrical parameters were identified to achieve a maximum polarized coupling efficiency to a Gaussian profile in the far field with a modest increase in pump power.
APPLIED PHYSICS LETTERS
(2021)
Article
Materials Science, Multidisciplinary
K. Berrada, A. Sabik, H. Eleuch
Summary: In this paper, the photon-added deformed spin coherent states (PA-DSCSs) are constructed based on the deformed spin algebra (DSA). A method for solving the unity operator problem is presented and solutions for specific cases are given. The obtained states are expressed using the Holstein-Primakoff (HP) realization of the DSA. The statistical properties of the coherent states are analyzed by varying the Mandel's parameter. The bipartite entanglement with respect to different parameters of these states is investigated using the PA-DSCSs.
RESULTS IN PHYSICS
(2023)
Article
Physics, Multidisciplinary
Christina Psaroudaki, Gil Refael
Summary: The study reveals a novel photon pumping phenomenon with strong fluctuations and high efficiency under nonadiabatic driving conditions, reaching up to 80% of the quantized value in experimentally accessible regions.
Article
Chemistry, Multidisciplinary
Minxue Huang, Shipeng Gong, Changlai Wang, Yang Yang, Peng Jiang, Pengcheng Wang, Lin Hu, Qianwang Chen
Summary: Copper-based heterogeneous catalysts have low selectivity in CO2 hydrogenation, while molecular catalysts with well-defined active sites and tailorable structures can optimize performance. This study successfully immobilized EDTA molecules on carbon nanotube surfaces to convert CO2 to CH4, offering potential for controlling product selectivity in CO2 reduction processes in the future.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Materials Science, Multidisciplinary
Sheng-Qiang Zhong, Shun-Cai Zhao, Sheng-Nan Zhu
Summary: This study evaluated the performance of a cavity-coupled double quantum dots (DQDs) photocell and found that the cavity-DQDs coupling coefficient plays a dissipative role in the photovoltaic performance, and the size of the cavity limits the photovoltaic performance. Furthermore, the cavity-coupled DQDs photocell easily absorbs more low-energy photons compared to the case without cavity, providing strategies for improving photoelectric conversion efficiency.
RESULTS IN PHYSICS
(2021)
Article
Chemistry, Inorganic & Nuclear
Matteo Atzori, Elena Garlatti, Giuseppe Allodi, Simone Chicco, Alessandro Chiesa, Andrea Albino, Roberto De Renzi, Enrico Salvadori, Mario Chiesa, Stefano Carretta, Lorenzo Sorace
Summary: A comprehensive characterization of a 3d organometallic complex is reported, showing its potential for quantum computing applications.
INORGANIC CHEMISTRY
(2021)
Article
Physics, Multidisciplinary
Matthieu C. Dartiailh, William Mayer, Joseph Yuan, Kaushini S. Wickramasinghe, Alex Matos-Abiague, Igor Zutic, Javad Shabani
Summary: The research involves embedding two gate-tunable Al/InAs Josephson junctions in a loop geometry, where a pi jump in the junction phase is observed with an increasing in-plane magnetic field. This jump, accompanied by a minimum of the critical current, suggests a closing and reopening of the superconducting gap, showing strong anisotropy. The study's theory confirms that these signatures of a topological transition are consistent with the emergence of Majorana bound states.
PHYSICAL REVIEW LETTERS
(2021)
Article
Multidisciplinary Sciences
Matthieu C. Dartiailh, Joseph J. Cuozzo, Bassel H. Elfeky, William Mayer, Joseph Yuan, Kaushini S. Wickramasinghe, Enrico Rossi, Javad Shabani
Summary: Experimental observation of missing odd Shapiro steps in topologically trivial Josephson junctions due to high transparency, with caution needed in relationship to topological superconductivity.
NATURE COMMUNICATIONS
(2021)
Article
Multidisciplinary Sciences
F. Valmorra, K. Yoshida, L. C. Contamin, S. Messelot, S. Massabeau, M. R. Delbecq, M. C. Dartiailh, M. M. Desjardins, T. Cubaynes, Z. Leghtas, K. Hirakawa, J. Tignon, S. Dhillon, S. Balibar, J. Mangeney, A. Cottet, T. Kontos
Summary: The study demonstrates deep strong coupling between a single electron in a carbon nanotube quantum dot and a THz resonator, resulting in a THz-scale transport gap. This light-matter interaction allows for the readout of non-classical states of light, providing a valuable resource for THz quantum optics.
NATURE COMMUNICATIONS
(2021)
Article
Quantum Science & Technology
L. C. Contamin, M. R. Delbecq, B. Doucot, A. Cottet, T. Kontos
Summary: This study proposes a method of entangling light with Majorana matter to construct a network for quantum computing. By utilizing the light-induced interaction in a one-dimensional chain of physical Majorana modes, the setup enables all the required basic operations in a Majorana quantum computing platform.
NPJ QUANTUM INFORMATION
(2021)
Article
Music
Audrey Cottet
Summary: This article presents a study on finger cymbals used by Roman dancers, providing evidence that they used similar finger cymbals to those used by Middle Eastern dancers.
Article
Physics, Multidisciplinary
W. C. Smith, M. Villiers, A. Marquet, J. Palomo, M. R. Delbecq, T. Kontos, P. Campagne-Ibarcq, B. Doucot, Z. Leghtas
Summary: This work demonstrates that pairing Cooper pairs magnifies the phase fluctuations of the circuit ground state, providing evidence for the suppression of circuit flux sensitivity and revealing a delocalized state of the ground state across several Josephson wells.
Article
Chemistry, Physical
Kun-Rok Jeon, Jae-Keun Kim, Jiho Yoon, Jae-Chun Jeon, Hyeon Han, Audrey Cottet, Takis Kontos, Stuart S. P. Parkin
Summary: Researchers have reported a zero-field polarity-switchable Josephson supercurrent diode, in which a proximity-magnetized Pt layer by ferrimagnetic insulating Y3Fe5O12 serves as the Rashba-type Josephson barrier, achieving high-efficiency zero-field rectification effect. The study demonstrates that exchange spin-splitting and Rashba-type spin-orbit coupling at the Pt/Y3Fe5O12 interface are crucial for the zero-field giant rectification efficiency.
Correction
Chemistry, Physical
Kun-Rok Jeon, Jae-Keun Kim, Jiho Yoon, Jae-Chun Jeon, Hyeon Han, Audrey Cottet, Takis Kontos, Stuart S. P. Parkin
Article
Physics, Applied
Martin Nurizzo, Baptiste Jadot, Pierre-Andre Mortemousque, Vivien Thiney, Emmanuel Chanrion, Matthieu Dartiailh, Arne Ludwig, Andreas D. Wieck, Christopher Bauerle, Matias Urdampilleta, Tristan Meunier
Summary: Recent demonstrations using electron spins stored in quantum dot array as qubits show promise for developing a scalable quantum computing platform. By partitioning the system with inter-dot tunnel barriers, the precise control of the quantum dot parameters can be simplified and protection against unwanted charge displacement can be achieved.
APPLIED PHYSICS LETTERS
(2022)
Article
Physics, Multidisciplinary
J. Stevens, D. Szombati, M. Maffei, C. Elouard, R. Assouly, N. Cottet, R. Dassonneville, Q. Ficheux, S. Zeppetzauer, A. Bienfait, A. N. Jordan, A. Auffeves, B. Huard
Summary: In this study, a quantum gate is implemented using a resonant drive field in a superconducting platform. The research shows that during the gate, the energy change in the drive field can exceed the energy that can be extracted by the qubit due to the measurement backaction.
PHYSICAL REVIEW LETTERS
(2022)
Article
Multidisciplinary Sciences
Lauriane C. Contamin, Lucas Jarjat, William Legrand, Audrey Cottet, Takis Kontos, Matthieu R. Delbecq
Summary: Hybrid devices combining superconductors and one-dimensional nanowires are promising for achieving topological superconductivity and its related excitations. This study investigates the use of an ultra-clean carbon nanotube circuit to test the effects of magnetic fields, weak disorder, and superconductivity on low energy states, confirming the predictions of random matrix theory.
NATURE COMMUNICATIONS
(2022)
Correction
Multidisciplinary Sciences
Lauriane C. Contamin, Lucas Jarjat, William Legrand, Audrey Cottet, Takis Kontos, Matthieu R. Delbecq
NATURE COMMUNICATIONS
(2022)
Article
Quantum Science & Technology
Martin Nurizzo, Baptiste Jadot, Pierre-Andre Mortemousque, Vivien Thiney, Emmanuel Chanrion, David Niegemann, Matthieu Dartiailh, Arne Ludwig, Andreas D. Wieck, Christopher Baeuerle, Matias Urdampilleta, Tristan Meunier
Summary: We propose a protocol to achieve complete spin state readout of a two-electron system in a double quantum dot probed by an electrometer. This is done through repetitive single-shot measurements using Pauli spin blockade and our ability to tune the detuning and interdot tunnel coupling on fast timescales. By performing three distinct manipulations and measurements, we can determine if the spins are in the S, T0, T+, or T- state. This work addresses an important challenge of reducing the overhead for spin readout in scaling up spin-qubit platforms.
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
Materials Science, Multidisciplinary
Marek Narozniak, Matthieu C. Dartiailh, Jonathan P. Dowling, Javad Shabani, Tim Byrnes
Summary: In this study, a physical system capable of performing topological quantum computation with Majorana zero modes in a one-dimensional topological superconductor is proposed and analyzed. A scheme is introduced to implement quantum logical gates in a purely one-dimensional geometry without T junctions, instead using an auxiliary qubit and introducing a non-Clifford gate. Topologically protected logical Z gate and non-Clifford rotations are achieved by local interactions within the 1DTS, with the possibility of performing arbitrary unitary rotations for universal quantum computing.