Tootfinder

Even-Odd Layer-Dependent Exchange Bias Effect in MnBi2Te4 Chern Insulator Devices
Bo Chen, Xiaoda Liu, Yu-Hang Li, Han Tay, Takashi Taniguchi, Kenji Watanabe, Moses. H. W. Chan, Jiaqiang Yan, Fengqi Song, Ran Cheng, Cui-Zu Chang
https://arxiv.org/abs/2404.03032

Even-Odd Layer-Dependent Exchange Bias Effect in MnBi2Te4 Chern Insulator Devices
Magnetic topological materials with coexisting magnetism and non-trivial band structures exhibit many novel quantum phenomena, including the quantum anomalous Hall effect, the axion insulator state, and the Weyl semimetal phase. As a stoichiometric layered antiferromagnetic topological insulator, thin films of MnBi2Te4 show fascinating even-odd layer-dependent physics. In this work, we fabricate a series of thin-flake MnBi2Te4 devices using stencil masks and observe the Chern insulator state at…

Thermodynamically reversible quantum measurements and related work costs
Camille L Latune, Cyril Elouard
https://arxiv.org/abs/2402.16037 https://

Thermodynamically reversible quantum measurements and related work costs
Considering a general microscopic model for quantum measurement comprising a measurement apparatus coupled to a thermal bath, we analyze the energetic resources necessary for the realisation of quantum measurements, including the process of switching on and off the coupling between the system and the apparatus, the transition to a statistical mixture, the classical readout, and the apparatus resetting. We show via general thermodynamic arguments that the minimal required work depends on the ene…

On the potential of quantum walks for modeling financial return distributions
Stijn De Backer, Luis E. C. Rocha, Jan Ryckebusch, Koen Schoors
https://arxiv.org/abs/2403.19502

On the potential of quantum walks for modeling financial return distributions
Accurate modeling of the temporal evolution of asset prices is crucial for understanding financial markets. We explore the potential of discrete-time quantum walks to model the evolution of asset prices. Return distributions obtained from a model based on the quantum walk algorithm are compared with those obtained from classical methodologies. We focus on specific limitations of the classical models, and illustrate that the quantum walk model possesses great flexibility in overcoming these. Thi…

Thermodynamically reversible quantum measurements and related work costs
Camille L Latune, Cyril Elouard
https://arxiv.org/abs/2402.16037 https://

Thermodynamically reversible quantum measurements and related work costs
Considering a general microscopic model for quantum measurement comprising a measurement apparatus coupled to a thermal bath, we analyze the energetic resources necessary for the realisation of quantum measurements, including the process of switching on and off the coupling between the system and the apparatus, the transition to a statistical mixture, the classical readout, and the apparatus resetting. We show via general thermodynamic arguments that the minimal required work depends on the ene…

Harmonic Oscillator Staging for Efficient Path Integral Simulations
Sabry G. Moustafa, Andrew J. Schultz
https://arxiv.org/abs/2404.12551 https://

Harmonic Oscillator Staging for Efficient Path Integral Simulations
Imaginary-time path integral (PI) is a rigorous quantum mechanical tool to compute static properties. However, the stiff nature of the internal PI modes poses a sampling challenge. This is commonly tackled using staging coordinates, in which the free particle (FP) contribution of the PI action is diagonalized. We introduce novel and simple staging coordinates that diagonalize the entire action of the harmonic oscillator (HO), rendering it efficiently applicable to systems with a harmonic charac…

Stacking-Configuration-Preserved Graphene Quantum Dots Electrochemically Obtained from CVD Graphene
Santiago D. Barrionuevo, Federico Fioravanti, Jorge M. Nu\~nez, David Mu\~neton Arboleda, Gabriela I. Lacconi, Martin G. Bellino, Myriam H. Aguirre, Francisco J. Iba\~nez
https://arxiv.org/abs/2403.11922

Stacking-Configuration-Preserved Graphene Quantum Dots Electrochemically Obtained from CVD Graphene
The layer stacking morphology in nanocarbons is paramount for achieving new properties and outperforming applications. Here, we demonstrate that graphene quantum dots (GQDs) retain crystallinity and a stacking structure from CVD graphene grown on Ni foam. Our results reveal that GQD subdomains comprise a few-layer graphene structure in the AB -- AB and ABC -- ABC stacking configuration. HR-TEM images along with a multiple-approach characterization (XRD, XPS, UV-vis, AFM, and ATR-IR) exhibit 3.0…

Full quantum state control of chiral molecules
JuHyeon Lee, Elahe Abdiha, Boris G. Sartakov, Gerard Meijer, Sandra Eibenberger-Arias
https://arxiv.org/abs/2402.17308

Full quantum state control of chiral molecules
Controlling the internal quantum states of chiral molecules for a selected enantiomer has a wide range of fundamental applications. Using tailored microwave fields, a chosen rotational state can be enriched for a selected enantiomer, even starting from a racemic mixture. This enables rapid switching between samples of different enantiomers in a given state, holding great promise, for instance, for measuring parity violation in chiral molecules. Achieving full enantiomer-specific state transfer …

Eigenstate switching of topologically ordered states using non-Hermitian perturbations
Cheol Hun Yeom, Beom Hyun Kim, Moon Jip Park
https://arxiv.org/abs/2402.17280

Eigenstate switching of topologically ordered states using non-Hermitian perturbations
Topologically ordered phases have robust degenerate ground states against the local perturbations, providing a promising platform for fault-tolerant quantum computation. Despite of the non-local feature of the topological order, we find that local non-Hermitian perturbations can induce the transition between the topologically ordered ground states. In this work, we study the toric code in the presence of non-Hermitian perturbations. By controlling the non-Hermiticity, we show that non-orthogona…

Ferroelectrically tunable topological phase transition in In$_2$Se$_3$ thin films
Zhiqiang Tian, Ziming Zhu, Jiang Zeng, Chao-Fei Liu, Yurong Yang, Anlian Pan, Mingxing Chen
https://arxiv.org/abs/2402.18274

Ferroelectrically tunable topological phase transition in In$_2$Se$_3$ thin films
Materials with ferroelectrically switchable topological properties are of interest for both fundamental physics and practical applications. Using first-principles calculations, we find that stacking ferroelectric $α$-In$_2$Se$_3$ monolayers into a bilayer leads to polarization-dependent band structures, which yields polarization-dependent topological properties. Specifically, we find that the states with interlayer ferroelectric couplings are quantum spin Hall insulators, while those with anti…

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initial toot: https://mastoxiv.page/@arXiv_qu…

Charge-parity switching effects and optimisation of transmon-qubit design parameters
Enhancing the performance of noisy quantum processors requires improving our understanding of error mechanisms and the ways to overcome them. In this study, we identify optimal ranges for qubit design parameters, grounded in comprehensive noise modeling. To this end, we also analyze a previously unexplored error mechanism that can perturb two-qubit gates due to charge-parity switches caused by quasiparticles. Due to the utilization of the higher levels of a transmon, where the charge dispersion…