Publications (31)
Ensemble Successor Representations for Task Generalization in Offline-to-Online Reinforcement Learning
Changhong Wang, Xudong Yu, Chenjia Bai +2
In Reinforcement Learning (RL), training a policy from scratch with online experiences can be inefficient because of the difficulties in exploration. Recently, offline RL provides…
Triply-resonant Optical Parametric Oscillator by Four-wave Mixing with Rubidium Vapor inside an Optical Cavity
Xudong Yu, Min Xiao, Jing Zhang
We present an experimental demonstration of simultaneous above-threshold oscillations of the Stokes and anti-Stokes fields together with the single pumping beam with rubidium atoms…
Exotic critical states as fractional Fermi seas in the one-dimensional Bose gas
Alvise Bastianello, Yi Zeng, Sudipta Dhar +7
Critical quantum field theories occupy a central position in modern theoretical physics for their inherent universality stemming from long-range correlations. As an example, the To…
The wave nature of a Mott insulator
Xudong Yu, Chengyang Wu, Wenhan Chen +10
Quantum phases of matter are routinely identified by coherence features, with interference patterns being one of the most directly observable quantities. In lattices, the superflui…
Second-harmonic generation from an optically levitated KTP nanocrystal in vacuum
Yuanbin Jin, Chenli Gao, Jiayu Feng +3
The optically levitated system in vacuum has emerged as a powerful platform for studies of fundamental physics and precision measurements. Although various nanoparticles have been…
Measurement of the squeezed vacuum state by a bichromatic local oscillator
Wei Li, Xudong Yu, Jing Zhang
We present the experimental measurement of a squeezed vacuum state by means of a bichromatic local oscillator (BLO). A pair of local oscillators at 5 MHz around the central fr…
Diverse Randomized Value Functions: A Provably Pessimistic Approach for Offline Reinforcement Learning
Xudong Yu, Chenjia Bai, Hongyi Guo +2
Offline Reinforcement Learning (RL) faces distributional shift and unreliable value estimation, especially for out-of-distribution (OOD) actions. To address this, existing uncertai…
6 GHz hyperfast rotation of an optically levitated nanoparticle in vacuum
Yuanbin Jin, Jiangwei Yan, Shah Jee Rahman +3
We report an experimental observation of a record-breaking ultra-high rotation frequency about 6 GHz in an optically levitated nanoparticle system. We optically trap a nanoparticle…
sPHENIX measurement of Open-Charm Baryon-to-Meson Ratios in + collisions at RHIC
Xudong Yu
sPHENIX is a state-of-the-art experiment at the Relativistic Heavy Ion Collider (RHIC), dedicated to the study of heavy-flavor and jet physics. Its precision tracking system, combi…
Towards Robust Offline-to-Online Reinforcement Learning via Uncertainty and Smoothness
Xiaoyu Wen, Xudong Yu, Rui Yang +3
To obtain a near-optimal policy with fewer interactions in Reinforcement Learning (RL), a promising approach involves the combination of offline RL, which enhances sample efficienc…
Direct Observation of the Three-Dimensional Anderson Transition with Ultracold Atoms in a Disordered Potential
Xudong Yu, Ke Xie, Hoa Mai Quach +7
Anderson localization of particles -- the complete halt of wave transport through multiple scattering and phase coherence -- is a paradigmatic manifestation of quantum interference…
Interference of the scattered vector light fields from two optically levitated nanoparticles
Yuanbin Jin, Jiangwei Yan, Shah Jee Rahman +2
We experimentally study the interference of dipole scattered light from two optically levitated nanoparticles in vacuum, which present an environment free of particle-substrate int…
Controllable coupled-resonator-induced transparency in a dual-recycled Michelson interferometer
Xudong Yu, Wei Li, YuanBin Jin +1
We theoretically and experimentally study the effect of the coupled-resonator-induced transparency in the Michelson interferometer with the dual-recycled configuration, which is eq…
Contrastive Representation for Data Filtering in Cross-Domain Offline Reinforcement Learning
Xiaoyu Wen, Chenjia Bai, Kang Xu +4
Cross-domain offline reinforcement learning leverages source domain data with diverse transition dynamics to alleviate the data requirement for the target domain. However, simply m…
sPHENIX measurements of heavy flavor production in + collisions
Xudong Yu
sPHENIX is the first new collider detector experiment dedicated to heavy-ion physics since the LHC began collecting data. Successfully commissioned in 2023-2024, one of its standou…
Search for charged lepton flavor violation in decays at BESIII
Xudong Yu
In the Standard Model, charged lepton flavor violation (CLFV) is heavily suppressed by tiny neutrino mass, while many theoretical models can enhance CLFV effects up to a detectable…
Bichromatic state-dependent disordered potential for Anderson localization of ultracold atoms
Baptiste Lecoutre, Yukun Guo, Xudong Yu +5
The ability to load ultracold atoms at a well-defined energy in a disordered potential is a crucial tool to study quantum transport, and in particular Anderson localization. In thi…
Multi-normal-mode splitting of a cavity in the presence of atoms -- towards the superstrong coupling regime
Xudong Yu, Dezhi Xiong, Haixia Chen +3
Multi-normal-mode splitting peaks are experimentally observed in a system with Doppler-broadened two-level atoms inside a relatively long optical cavity. In this system, the atoms-…
Angular distribution of and implications for form factors
Kaiwen Chen, Zhi-Peng Xing, Xudong Yu +1
The paper derives the full four‑body angular distribution for the cascade semileptonic decay Λ_c^+ → Λ^*_{1405/1520}(→ Σπ) ℓ^+ ν_ℓ using helicity amplitudes, and shows how the resu…
Imaging the dipole scattering of an optically levitated dielectric nanoparticle
Yuanbin Jin, Jiangwei Yan, Shah Jee Rahman +2
We experimentally observe the dipole scattering of a nanoparticle using a high numerical aperture (NA) imaging system. The optically levitated nanoparticle provides an environment…
Enhanced sensitivity of low-frequency signal by using broad squeezed light and bichromatic local oscillator
Wei Li, Yuanbin Jin, Xudong Yu +1
We experimentally study a protocol of using the broadband high frequency squeezed vacuum to detect the low-frequency signal. In this scheme, the lower sideband field of the squeeze…
A proposed PKU-Muon experiment for muon tomography and dark matter search
Xudong Yu, Zijian Wang, Cheng-en Liu +13
We propose here a set of new methods to directly detect light mass dark matter through its scattering with abundant atmospheric muons or accelerator beams. Firstly, we plan to use…
On-demand assembly of optically-levitated nanoparticle arrays in vacuum
Jiangwei Yan, Xudong Yu, Zheng Vitto Han +2
Realizing a large-scale fully controllable quantum system is a challenging task in current physical research and has broad applications. Ultracold atom and molecule arrays in optic…
Realization of fractional Fermi seas
Yi Zeng, Alvise Bastianello, Sudipta Dhar +7
The Pauli exclusion principle is a cornerstone of quantum physics: it governs the structure of matter. Extensions of this principle, such as Haldane's generalized exclusion statist…
Observing the emergence of a velocity hierarchy in matter waves
Xudong Yu, Wenhan Chen, Igor Zhuravlev +8
Classical waves in dispersive media naturally exhibit distinct phase and group velocities. Whether an analogous separation of velocities can emerge in matter waves under strong man…
Observation of atom-number fluctuations in optical lattices via quantum collapse and revival dynamics
Tianwei Zhou, Kaixiang Yang, Zijie Zhu +9
Using the quantum collapse and revival phenomenon of a Bose--Einstein condensate in three-dimensional optical lattices, the atom number statistics on each lattice site are experime…
Charmed baryon decays at BESIII
Xudong Yu
BESIII has accumulated 4.5 fb of collision data in the 4.6 to 4.7 GeV energy range, corresponding to the world's largest sample of pairs. This pa…
Experimental study of balanced optical homodyne and heterodyne detection by controlling sideband modulation
Wei Li, Zengming Meng, Xudong Yu +1
We experimentally study optical homodyne and heterodyne detections with a same setup, which is flexible to manipulate the signal sideband modulation. When the modulation only gener…
Regularized Conditional Diffusion Model for Multi-Task Preference Alignment
Xudong Yu, Chenjia Bai, Haoran He +2
Sequential decision-making is desired to align with human intents and exhibit versatility across various tasks. Previous methods formulate it as a conditional generation process, u…
Search for Baryon/Lepton number violation processes at BESIII
Xudong Yu
The observed matter-antimatter asymmetry in the universe is a serious challenge to our understanding of nature. Baryon/lepton number violation (BNV/LNV) decays have been searched f…
Energy-resolved transport of ultracold atoms across the Anderson transition: theory and experiment
Jean-Philippe Banon, Sacha Barré, Ke Xie +7
In a recent experiment [X. Yu et al., arXiv:2602.07654], energy-resolved measurements of an atomic matter wave spreading in a speckle potential enabled the direct observation of th…