Article
Multidisciplinary Sciences
C. Lagoin, U. Bhattacharya, T. Grass, R. W. Chhajlany, T. Salamon, K. Baldwin, L. Pfeiffer, M. Lewenstein, M. Holzmann, F. Dubin
Summary: The Hubbard model is a celebrated theoretical framework in condensed-matter physics. This study implements the extended Bose-Hubbard Hamiltonian by confining semiconductor dipolar excitons in an artificial two-dimensional square lattice, showcasing the characteristic features of checkerboard spatial order.
Article
Physics, Multidisciplinary
Raffaele Salvia, Mohammad Mehboudi, Marti Perarnau-Llobet
Summary: In this study, we investigate the estimation of parameters in many-body systems near a quantum critical point, known as critical quantum metrology, using Bayesian inference theory. We demonstrate a no-go result which states that nonadaptive strategies will fail to exploit quantum critical enhancement when the prior knowledge is limited. However, we propose adaptive strategies with real-time feedback control that can overcome this limitation and achieve sub-shot-noise scaling even with few measurements and substantial prior uncertainty.
PHYSICAL REVIEW LETTERS
(2023)
Article
Optics
Seth T. Rittenhouse, P. Giannakeas, Nirav P. Mehta
Summary: This study investigates the two-body scattering of particles in a one-dimensional periodic potential and utilizes a convenient ansatz to separate center-of-mass and relative motion, resulting in a discrete Schrodinger equation resembling a tight-binding model. By defining distinct scattering lengths and discussing collision resonances, the research reveals the interaction between different bands and collision resonances in the excited band.
Article
Optics
M. Iskin, A. Kele
Summary: In this study, we investigate the bound states of N identical bosons described by a multiband Bose-Hubbard model with various hoppings and an attractive on-site interaction. We derive exact integral equations for the dimers, trimers, tetramers, and other multimers using a variational approach and apply them to a one-dimensional sawtooth model with two bands. Our results reveal the presence of off-site dimer states and off-site trimer states, which were not previously observed in the strong-coupling limit. We compare our variational calculations with density matrix renormalization group (DMRG) simulations and find excellent agreement.
Article
Materials Science, Multidisciplinary
Niclas Goetting, Frederik Lohof, Christopher Gies
Summary: In bilayers of semiconducting transition metal dichalcogenides, the twist angle between layers can introduce a periodic potential modulation, leading to correlated states of excitons. The transition between Mott and extended exciton phases is explored using a moire-Bose-Hubbard Hamiltonian, with parameters obtained from Wannier representation and a nonlocal Rytova-Keldysh model for dielectric screening. The predicted emergence of Mott-insulating states in this system suggests the potential of twisted transition metal dichalcogenide heterostructures as quantum simulators.
Article
Optics
Tuure Orell, Maximilian Zanner, Mathieu L. Juan, Aleksei Sharafiev, Romain Albert, Stefan Oleschko, Gerhard Kirchmair, Matti Silveri
Summary: This article investigates the collective effects of multiple emitters interacting with an electromagnetic mode. It reveals significant differences in the emerging collective effects for an array of interacting anharmonic oscillators compared to those of two-level systems and harmonic oscillators. The bosonic decay rate of the most superradiant state increases linearly with the filling factor and exceeds that of two-level systems. Furthermore, dark states are formed in bosonic systems, while in two-level systems, superradiance diminishes with larger filling factors and no dark states are formed.
Article
Physics, Multidisciplinary
Heonjoon Park, Jiayi Zhu, Xi Wang, Yingqi Wang, William Holtzmann, Takashi Taniguchi, Kenji Watanabe, Jiaqiang Yan, Liang Fu, Ting Cao, Di Xiao, Daniel R. Gamelin, Hongyi Yu, Wang Yao, Xiaodong Xu
Summary: Strong dipole-dipole interactions in a moire superlattice form a ground state similar to a Mott insulator, making it a powerful platform for engineering correlated electronic phenomena. Optical excitation generates charge neutral interlayer excitons with an out-of-plane electric dipole. Strong onsite dipole-dipole interaction can create correlated bosonic states, but this has not been proven yet.
Article
Physics, Fluids & Plasmas
Sheng Yang, Jing-Bo Xu
Summary: In this work, the ground-state phase diagram of Rydberg atoms on a honeycomb lattice is mapped out, revealing five intricate density-wave-ordered phases in addition to a disordered phase. The properties of these quantum phases are analyzed, and a continuous quantum phase transition belonging to the (2 + 1)-dimensional Ising universality class is explored. This work provides insights into the Rydberg system and serves as a numerical guide for possible real experiments.
Article
Physics, Multidisciplinary
Eric Brunner, Lukas Pausch, Edoardo G. Carnio, Gabriel Dufour, Alberto Rodriguez, Andreas Buchleitner
Summary: We reveal the existence of many-body interference in the dynamical regimes of the Bose-Hubbard model. The temporal fluctuations of few-body observables are significantly enhanced at the onset of quantum chaos due to the increased indistinguishability of particles. By analyzing the exchange symmetries of partially distinguishable particles, we demonstrate that this enhancement is the manifestation of the coherence of the initial state in the eigenbasis.
PHYSICAL REVIEW LETTERS
(2023)
Article
Optics
Peter Schlagheck, Denis Ullmo, Gabriel M. Lando, Steven Tomsovic
Summary: This study investigates the impact of many-body quantum interference and matter-wave revivals on physical observables in an ultracold bosonic system in an optical lattice. In the case of the Bose-Hubbard dimer, a interplay between weak intersite tunneling and strong on-site interactions leads to unique quantum dynamics not seen in mean-field approaches. The effects of cooperative matter-wave interference on occupancy oscillations and coherence, as well as the resurgent revivals and synchronization of revival peaks and occupancy oscillation peaks, are demonstrated.
Article
Physics, Multidisciplinary
Wenliang Liu, Ningxuan Zheng, Jun Jian, Li Tian, Jizhou Wu, Yuqing Li, Yongming Fu, Peng Li, Vladimir Sovkov, Jie Ma, Liantuan Xiao, Suotang Jia
Summary: In this study, Bose-Einstein condensates (BEC) of sodium atoms are transferred into a one-dimensional optical lattice potential. The behavior of the condensate in the lattice potential is observed to change qualitatively at a specific depth, transitioning from a superfluid state to a state lacking phase coherence.
Article
Instruments & Instrumentation
Jonathan Trisnadi, Mingjiamei Zhang, Lauren Weiss, Cheng Chin
Summary: The quantum matter synthesizer (QMS) is a new quantum simulation platform that allows for spatial manipulation and control of individual ultracold atoms, enabling full control of a many-body quantum system.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2022)
Article
Physics, Multidisciplinary
Valerio Peri, Zhi-Da Song, B. Andrei Bernevig, Sebastian D. Huber
Summary: This study investigates the superconductivity behavior in flat bands with topological properties similar to MATBG. Numerical simulations demonstrate a superconducting phase transition with a critical temperature linearly scaling with the interaction strength, validating the topological bound beyond mean-field approximation and emphasizing the significance of fragile topology for flat-band superconductivity.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Victor E. Colussi, Fabio Caleffi, Chiara Menotti, Alessio Recati
Summary: We study the effects of quantum fluctuations in the two-component Bose-Hubbard model and generalize the quantum Gutzwiller approach to mixtures. The mean-field ground-state phase diagram and spectrum of elementary excitations are analyzed, with a focus on quantum phase transitions. We investigate the superfluid transport properties and the linear response dynamics to density and spin probes within the quantum critical regimes. We find that quantum fluctuations have a significant impact on the drag between the superfluid species in the system, especially in the vicinity of the paired and antipaired phases absent in the usual one-component Bose-Hubbard model. Additionally, the contributions of quantum corrections to the one-body coherence and density/spin fluctuations are analyzed from the perspective of the collective modes of the system, providing results for the few-body correlations in all regimes of the phase diagram.
Article
Materials Science, Multidisciplinary
Joachim Brand, Mingrui Yang, Elke Pahl
Summary: The study investigates a statistical bias in FCIQMC that can become the dominant error, especially in scenarios without sign problem, such as in bosonic systems. Researchers provide new insights into the nature of the bias and suggest possible methods to address the population control bias.
Article
Physics, Applied
Aneirin J. Baker, Gerhard B. P. Huber, Niklas J. Glaser, Federico Roy, Ivan Tsitsilin, Stefan Filipp, Michael J. Hartmann
Summary: In this study, a single shot method for executing an i-Toffoli gate using currently existing superconducting hardware is proposed. The method has demonstrated high process fidelity and fast gate time, and can be extended to implement gates with more than two control qubits at similar fidelities.
APPLIED PHYSICS LETTERS
(2022)
Article
Multidisciplinary Sciences
F. Caycedo-Soler, A. Mattioni, J. Lim, T. Renger, S. F. Huelga, M. B. Plenio
Summary: Numerically exact simulations reveal that multimode vibronic mixing in model photosynthetic systems strongly affects optical responses and facilitates coherent dynamics. The generation, transport, and trapping of excitons in pigment-protein complexes (PPCs) are crucial for photosynthesis. The inclusion of full multi-mode vibronic dynamics in numerical calculations of linear spectra leads to significant corrections to electronic parameter estimation. These effects are relevant to the discussion on the origin of long-lived oscillations in multidimensional nonlinear spectra.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Yingke Wu, Priyadharshini Balasubramanian, Zhenyu Wang, Jaime A. S. Coelho, Mateja Prslja, Reiner Siebert, Martin B. Plenio, Fedor Jelezko, Tanja Weil
Summary: This study demonstrates the use of sub-10 nm-sized fluorescent nanodiamonds as catalysts for the decomposition of H2O2 and the production of radical intermediates at the nanoscale. The nitrogen-vacancy quantum sensors inside the nanodiamonds are employed to quantify these radicals. This method can be used as self-reporting H2O2 sensors with molecular-level sensitivity and nanoscale spatial resolution.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Physics, Multidisciplinary
Felix Ahnefeld, Thomas Theurer, Dario Egloff, Juan Mauricio Matera, Martin B. Plenio
Summary: In this paper, we investigate a sequential variant of Shor's algorithm and quantitatively explore the role of coherence. By using the framework of dynamical resource theories, we determine the lower and upper bounds of the success probability of the protocol and find that coherence is the quantum resource that determines its performance within the fixed structure considered.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Alexander Nuesseler, Dario Tamascelli, Andrea Smirne, James Lim, Susana F. Huelga, Martin B. Plenio
Summary: We utilize chain mapping transformations to identify a set of modes that capture the characteristic features of the environment, and propose a Markovian closure method to replace the infinite residual bath modes, which leads to faster computation and reduced memory requirement. The application of the Markovian closure is demonstrated in linear and nonlinear spectral response calculations.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Evan Meyer-Scott, Nidhin Prasannan, Ish Dhand, Christof Eigner, Viktor Quiring, Sonja Barkhofen, Benjamin Brecht, Martin B. Plenio, Christine Silberhorn
Summary: This study demonstrates the scalable generation of multiphoton entangled states by utilizing active feed-forward and multiplexing, increasing the generation rates and facilitating practical multiphoton protocols for photonic quantum technologies.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Mathematical
Giovanni Ferrari, Ludovico Lami, Thomas Theurer, Martin B. Plenio
Summary: In this study, we examine asymptotic state transformations in continuous variable quantum resource theories. We prove that lower semicontinuity and strong superadditivity can be used to bound asymptotic transformation rates in these settings. We provide applications to optical nonclassicality, entanglement, and quantum thermodynamics resource theories. Our findings offer computable upper bounds for asymptotic transformation rates, including those achievable with linear optical elements.
COMMUNICATIONS IN MATHEMATICAL PHYSICS
(2023)
Article
Chemistry, Physical
Clemens Vittmann, James Lim, Dario Tamascelli, Susana F. Huelga, Martin B. Plenio
Summary: This study examines the role of delocalized phonon modes in electron transport in chiral structures and demonstrates that spin selectivity can originate from spin-dependent energy and momentum conservation in electron-phonon scattering events. The degree of spin polarization, however, depends on environmental factors and the presence of external driving fields. The parametric dependence allows for experimentally testable predictions of the model.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Mathematics, Applied
Andrea Smirne, Dario Tamascelli, James Lim, Martin B. Plenio, Susana F. Huelga
Summary: In this study, we determine the conditions for the equivalence between the multi-time expectation values of a general finite-dimensional open quantum system when interacting with different environments. This non-perturbative evaluation of multi-time expectation values allows for the investigation of open-system multi-time quantities in fully general regimes.
OPEN SYSTEMS & INFORMATION DYNAMICS
(2022)
Article
Quantum Science & Technology
C. Munuera-Javaloy, R. Puebla, B. D'Anjou, M. B. Plenio, J. Casanova
Summary: This article presents a new method for detecting molecular conformational changes using nitroxide electron-spin labels and a nitrogen-vacancy center in diamond. By applying microwave and radiofrequency pulses carefully, stable nitroxide resonances can be achieved. The article also proposes an optimized scheme by using nitroxides with distinct nitrogen isotopes. Additionally, a simple theoretical model is developed and combined with Bayesian inference techniques to demonstrate the ability to detect conformational changes in ambient conditions and extract inter-label distances using the residual effect of random molecular tumbling.
NPJ QUANTUM INFORMATION
(2022)
Article
Quantum Science & Technology
Refik Mansuroglu, Timo Eckstein, Ludwig Nuetzel, Samuel A. Wilkinson, Michael J. Hartmann
Summary: In this work, a variational algorithm is introduced to predict efficient quantum circuits for time evolution of translationally invariant quantum systems using solutions of classical optimizations. This strategy can significantly improve upon the accuracy of Trotter-Suzuki approximation, reducing gate count and increasing overall fidelity. This is important in noisy intermediate scale quantum-applications where the fidelity decays exponentially with the number of gates.
QUANTUM SCIENCE AND TECHNOLOGY
(2023)
Article
Physics, Multidisciplinary
Patrick Barthel, Patrick H. Huber, Jorge Casanova, Inigo Arrazola, Dorna Niroomand, Theeraphot Sriarunothai, Martin B. Plenio, Christof Wunderlich
Summary: We demonstrate the experimental implementation of a two-qubit phase gate using a radio frequency controlled trapped-ion quantum processor. The gate is generated by applying a pulsed dynamical decoupling sequence to the ions' carrier transitions, allowing for tunable and high-fidelity phase shift. The gate's performance is robust against various sources of error and holds potential for fast gate speeds.
NEW JOURNAL OF PHYSICS
(2023)
Article
Physics, Multidisciplinary
Alejandro D. Somoza, Nicola Lorenzoni, James Lim, Susana F. Huelga, Martin B. Plenio
Summary: The role of vibrational motion in the charge dynamics of donor-acceptor networks in organic photovoltaics is investigated using non-perturbative simulations. The study addresses the challenge of simulating large electronic-vibrational systems and identifies conditions under which underdamped vibrational motion induces efficient charge separation. The results provide insights into coupling mechanisms and the role of entropic effects, offering a toolbox for designing efficient charge separation pathways in artificial nanostructures.
COMMUNICATIONS PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Verena Feulner, Michael J. Hartmann
Summary: The ground state properties of the J1-J2 model are difficult to analyze using classical numerical methods due to frustration. We propose a variational quantum eigensolver ansatz to approximate the ground state of the model and demonstrate that it can simplify quantum computations and scale linearly with lattice size.
Article
Physics, Multidisciplinary
Marek Pechal, Federico Roy, Samuel A. Wilkinson, Gian Salis, Max Werninghaus, Michael J. Hartmann, Stefan Filipp
Summary: This study demonstrates a controlled gate implemented in superconducting qubits, which generalizes classical perceptrons as the basic building block of quantum neural networks. Through tuning gate length, qubit coupling, and drive frequency, full control over the perceptron activation function, input weight, and bias is achieved. The gate performs a multiqubit entangling operation in a single step, requiring fewer gates than traditional decomposition.
PHYSICAL REVIEW RESEARCH
(2022)
