29,511 research outputs found
Simulating dynamical quantum Hall effect with superconducting qubits
We propose an experimental scheme to simulate the dynamical quantum Hall
effect and the related interaction-induced topological transition with a
superconducting-qubit array. We show that a one-dimensional Heisenberg model
with tunable parameters can be realized in an array of superconducting qubits.
The quantized plateaus, which is a feature of the dynamical quantum Hall
effect, will emerge in the Berry curvature of the superconducting qubits as a
function of the coupling strength between nearest neighbor qubits. We
numerically calculate the Berry curvatures of two-, four- and six-qubit arrays,
and find that the interaction-induced topological transition can be easily
observed with the simplest two-qubit array. Furthermore, we analyze some
practical conditions in typical experiments for observing such dynamical
quantum Hall effect.Comment: 9 pages, 6 figures, version accepted by PR
The prediction of using LHAASO's cosmic-ray electron measurements to constrain decaying heavy dark matter
LHAASO is an instrument designed for detecting cosmic rays (CRs) and gamma
rays at TeV to PeV energies. The decays of heavy dark matter particles in the
Galactic halo may produce high-energy electrons that can be detected by LHAASO.
The main background for the LHAASO's CR electron measurements is the hadron
residuals due to mis-identification of the particle species. In this paper, we
estimate the LHAASO's electron background using the known all-particle CR
spectrum and the hadron rejection efficiency of LHAASO. With the estimated
background, we predict the capability of LHAASO to constrain DM decay lifetime
at 95% confidence level for various channels. We find that, if neglecting
systematic uncertainties, the CR electron measurement by LHAASO can improve the
current best results by up to on order of magnitude for DM masses between 100 -
1000TeV. However, indirect measurements of CR electrons by ground-based
experiments suffer from uncertainties included in the calculation, the
projected constraints will be largely weakened. So for using the CR electron
observation of LHAASO to constrain the DM parameters, the key point is whether
the systematic error can be effectively reduced.Comment: 11 pages, 8 figures, accepted for publication in PR
Tachikuma: Understading Complex Interactions with Multi-Character and Novel Objects by Large Language Models
Recent advancements in natural language and Large Language Models (LLMs) have
enabled AI agents to simulate human-like interactions within virtual worlds.
However, these interactions still face limitations in complexity and
flexibility, particularly in scenarios involving multiple characters and novel
objects. Pre-defining all interactable objects in the agent's world model
presents challenges, and conveying implicit intentions to multiple characters
through complex interactions remains difficult. To address these issues, we
propose integrating virtual Game Masters (GMs) into the agent's world model,
drawing inspiration from Tabletop Role-Playing Games (TRPGs). GMs play a
crucial role in overseeing information, estimating players' intentions,
providing environment descriptions, and offering feedback, compensating for
current world model deficiencies. To facilitate future explorations for complex
interactions, we introduce a benchmark named Tachikuma, comprising a Multiple
character and novel Object based interaction Estimation (MOE) task and a
supporting dataset. MOE challenges models to understand characters' intentions
and accurately determine their actions within intricate contexts involving
multi-character and novel object interactions. Besides, the dataset captures
log data from real-time communications during gameplay, providing diverse,
grounded, and complex interactions for further explorations. Finally, we
present a simple prompting baseline and evaluate its performance, demonstrating
its effectiveness in enhancing interaction understanding. We hope that our
dataset and task will inspire further research in complex interactions with
natural language, fostering the development of more advanced AI agents.Comment: Preliminary version of an ongoing wor
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