Publications (49)
Generation of optical combs in a whispering gallery mode resonator from a bichromatic pump
Dmitry V. Strekalov, Nan Yu
An optical comb is shown to arise from a whispering gallery mode resonator pumped by two optical frequencies. Two externally excited modes couple due to Kerr nonlinearity to initia…
Searching for new physics in the solar system with tetrahedral spacecraft formations
Slava G. Turyshev, Sheng-wey Chiow, Nan Yu
Tetrahedral configurations of spacecraft on unperturbed heliocentric orbits allow for highly precise observations of small spatial changes in the gravitational field, especially th…
The Bose-Einstein Condensate and Cold Atom Laboratory
Kai Frye, Sven Abend, Wolfgang Bartosch +48
Microgravity eases several constraints limiting experiments with ultracold and condensed atoms on ground. It enables extended times of flight without suspension and eliminates the…
HiEAG: Evidence-Augmented Generation for Out-of-Context Misinformation Detection
Junjie Wu, Yumeng Fu, Nan Yu +1
Recent advancements in multimodal out-of-context (OOC) misinformation detection have made remarkable progress in checking the consistencies between different modalities for support…
Fluoride microresonators for mid-IR applications
Ivan S. Grudinin, Kamjou Mansour, Nan Yu
We study crystalline fluoride microresonators for mid-infrared applications. Whispering gallery mode resonators were fabricated with BaF, CaF and MgF crystals. The qual…
Broadband second harmonic generation in whispering gallery mode resonators
Guoping Lin, Josef U. Fürst, Dmitry V. Strekalov +1
Optical frequency conversion processes in nonlinear materials are limited in wavelength by the accessible phase matching and the required high pump powers. In this letter, we repor…
Frequency stability of a dual-mode whispering gallery mode optical reference cavity
Lukas M. Baumgartel, Robert J. Thompson, Nan Yu
We report an investigation of laser frequency stabilization using a whispering gallery mode resonator that is temperature stabilized by a dual-mode technique. This dual-mode techni…
Opportunities for Probing Fundamental Gravity with Solar System Experiments
Slava G. Turyshev, Thomas W. Murphy, Eric G. Adelberger +13
The recent discovery of "dark energy" has challenged Einstein's general theory of relativity as a complete model for our macroscopic universe. From a theoretical view, the challeng…
NASA's Cold Atom Laboratory: Five Years of Quantum Science Operations in Space
Kamal Oudrhiri, James M. Kohel, Nate Harvey +37
NASA's Cold Atom Laboratory (CAL) is a multi-user science facility for studying quantum gases in the microgravity environment of the International Space Station. The persistent mic…
Fundamental Physics with a State-of-the-Art Optical Clock in Space
Andrei Derevianko, Kurt Gibble, Leo Hollberg +5
Recent advances in optical atomic clocks and optical time transfer have enabled new possibilities in precision metrology for both tests of fundamental physics and timing applicatio…
General relativistic observables for the ACES experiment
Slava G. Turyshev, Nan Yu, Viktor T. Toth
We develop a high-precision model for relativistic observables of the Atomic Clock Ensemble in Space (ACES) experiment on the International Space Station (ISS). We develop all rela…
Observation of light dragging in rubidium vapor cell
Dmitry Strekalov, Andrey B. Matsko, Nan Yu +1
We report on the experimental demonstration of light dragging effect due to atomic motion in a rubidium vapor cell. We found that the minimum group velocity is achieved for light r…
The Deep Space Quantum Link: Prospective Fundamental Physics Experiments using Long-Baseline Quantum Optics
Makan Mohageg, Luca Mazzarella, Dmitry V. Strekalov +19
The National Aeronautics and Space Administration's Deep Space Quantum Link mission concept enables a unique set of science experiments by establishing robust quantum optical links…
Generating 500 mW for laser cooling of strontium atoms by injection locking a high power laser diode
Vladimir Schkolnik, Jason R. Williams, Nan Yu
We report on the generation of 500 mW of spectrally pure laser light at the 460.86 nm transition used for laser cooling of strontium atoms. To this end we inject a high power singl…
Frequency comb from a microresonator with engineered spectrum
Ivan S. Grudinin, Lukas Baumgartel, Nan Yu
We demonstrate that by varying the ratio between the linewidth and dispersion of a whispering gallery mode resonator we are able to control the number N of free spectral ranges sep…
Micro--structured crystalline resonators for optical frequency comb generation
Ivan S. Grudinin, Nan Yu
Optical frequency combs have recently been demonstrated in micro--resonators through nonlinear Kerr processes. Investigations in the past few years provided better understanding of…
STE-QUEST -- Space Time Explorer and QUantum Equivalence principle Space Test: The 2022 medium-class mission concept
Naceur Gaaloul, Holger Ahlers, Leonardo Badurina +45
Space-borne quantum technologies, particularly those based on atom interferometry, are heralding a new era of strategic and robust space exploration. The unique conditions of space…
Organizational Control Layer: Governance Infrastructure at the Execution Boundary of LLM Agent Systems
Tianyu Shi, Yang Mo, Yiou Liu +6
LLM-based agents are increasingly deployed in workflows where generated outputs may directly trigger state-changing actions. This creates an execution-boundary problem: proposed ac…
Polarization conversion loss in birefringent crystalline resonators
Ivan S. Grudinin, Guoping Lin, Nan Yu
Whispering gallery modes in birefringent crystalline resonators are investigated. We experimentally investigate the XY--cut resonators made with LiNbO, LiTaO and BBO and ob…
Extracting dark matter signatures from atomic clock stability measurements
Tigran Kalaydzhyan, Nan Yu
We analyze possible effects of the dark matter environment on the atomic clock stability measurements. The dark matter is assumed to exist in a form of waves of ultralight scalar f…
High-contrast Kerr Frequency Combs
Ivan S. Grudinin, Vincent Huet, Nan Yu +3
Kerr frequency combs with depressed harmonic at the optical pump frequency are theoretically explained and experimentally demonstrated. This result is achieved in a MgF photoni…
Robust numerical computation of the 3D scalar potential field of the cubic Galileon gravity model at solar system scales
Nicholas C. White, Sandra M. Troian, Jeffrey B. Jewell +3
Direct detection of dark energy or modified gravity may finally be within reach due to ultrasensitive instrumentation such as atom interferometry capable of detecting incredibly sm…
Discontinuous Named Entity Recognition as Maximal Clique Discovery
Yucheng Wang, Bowen Yu, Hongsong Zhu +3
Named entity recognition (NER) remains challenging when entity mentions can be discontinuous. Existing methods break the recognition process into several sequential steps. In train…
Laser-Ranging Long Baseline Differential Atom Interferometers for Space
Sheng-wey Chiow, Jason Williams, Nan Yu
High sensitivity differential atom interferometers are promising for precision measurements in science frontiers in space, including gravity field mapping for Earth science studies…
Gravity gradient suppression in spaceborne atomic tests of the equivalence principle
Sheng-wey Chiow, Jason Williams, Nan Yu +1
The gravity gradient is one of the most serious systematic effects in atomic tests of the equivalence principle (EP). While differential acceleration measurements performed with di…
Intensity interferometry for observation of dark objects
Dmitry V. Strekalov, Baris I. Erkmen, Nan Yu
We analyze an intensity interferometry measurement carried out with two point-like detectors facing a distant source (e.g., a star) that may be partially occluded by an absorptive…
Gravitational Redshift, Equivalence Principle, and Matter Waves
Michael A. Hohensee, Brian Estey, Francisco Monsalve +7
We review matter wave and clock comparison tests of the gravitational redshift. To elucidate their relationship to tests of the universality of free fall (UFF), we define scenarios…
The local dark sector. Probing gravitation's low-acceleration frontier and dark matter in the Solar System neighborhood
Joel Bergé, Laura Baudis, Philippe Brax +18
We speculate on the development and availability of new innovative propulsion techniques in the 2040s, that will allow us to fly a spacecraft outside the Solar System (at 150 AU an…
Impact of cavity spectrum on span in microresonator frequency combs
Ivan S. Grudinin, Lukas Baumgartel, Nan Yu
We experimentally study the factors that limit the span in frequency combs derived from the crystalline whispering gallery mode resonators. We observe that cavity dispersion is the…
E2LVLM:Evidence-Enhanced Large Vision-Language Model for Multimodal Out-of-Context Misinformation Detection
Junjie Wu, Yumeng Fu, Nan Yu +1
Recent studies in Large Vision-Language Models (LVLMs) have demonstrated impressive advancements in multimodal Out-of-Context (OOC) misinformation detection, discerning whether an…
Constraining symmetron dark energy using atom interferometry
Sheng-wey Chiow, Nan Yu
Symmetron field is one of the promising candidates of dark energy scalar fields. In all viable candidate field theories, a screening mechanism is implemented to be consistent with…
Gravitational wave detection with single-laser atom interferometers
Nan Yu, Massimo Tinto
We present a new general design approach of a broad-band detector of gravitational radiation that relies on two atom interferometers separated by a distance L. In this scheme, only…
Cold Atoms in Space: Community Workshop Summary and Proposed Road-Map
Ivan Alonso, Cristiano Alpigiani, Brett Altschul +246
We summarize the discussions at a virtual Community Workshop on Cold Atoms in Space concerning the status of cold atom technologies, the prospective scientific and societal opportu…
DINORANKCLIP: DINOv3 Distillation and Injection for Vision-Language Pretraining with High-Order Ranking Consistency
Shuyang Jiang, Nan Yu, Yiming Zhang +2
Contrastive language-image pretraining (CLIP) suffers from two structural weaknesses: the symmetric InfoNCE loss discards the relative ordering among unmatched in-batch pairs, and…
ProtTeX-CC: Activating In-Context Learning in Protein LLM via Two-Stage Instruction Compression
Chuanliu Fan, Zicheng Ma, Jun Gao +5
Recent advances in protein large language models, such as ProtTeX, represent both side-chain amino acids and backbone structure as discrete token sequences of residue length. While…
SIADAFIX: issue description response for adaptive program repair
Xin Cao, Nan Yu
We propose utilizing fast and slow thinking to enhance the capabilities of large language model-based agents on complex tasks such as program repair. In particular, we design an ad…
Time-Delay Interferometry with optical frequency comb
Massimo Tinto, Nan Yu
Heterodyne laser phase measurements in a space-based gravitational wave interferometer are degraded by the phase fluctuations of the onboard clocks, resulting in unacceptable sensi…
ChatMol: A Versatile Molecule Designer Based on the Numerically Enhanced Large Language Model
Chuanliu Fan, Ziqiang Cao, Zicheng Ma +5
Goal-oriented de novo molecule design, namely generating molecules with specific property or substructure constraints, is a crucial yet challenging task in drug discovery. Existing…
Dark Energy Search by Atom Interferometry in the Einstein-Elevator
Charles Garcion, Sukhjovan S. Gill, Magdalena Misslisch +13
The DESIRE project aims to test chameleon field theories as potential candidates for dark energy. The chameleon field is a light scalar field that is subject to screening mechanism…
Flicker noise in high-speed p-i-n photodiodes
Enrico Rubiola, Ertan Salik, Nan Yu +1
The microwave signal at the output of a photodiode that detects a modulated optical beam contains the phase noise phi(t) and the amplitude noise alpha(t) of the detector. Beside th…
Discourse-Aware Emotion Cause Extraction in Conversations
Dexin Kong, Nan Yu, Yun Yuan +2
Emotion Cause Extraction in Conversations (ECEC) aims to extract the utterances which contain the emotional cause in conversations. Most prior research focuses on modelling convers…
Matter-wave Tests of the Gravitational Redshift in Space
Holger Mueller, Michael A. Hohensee, Nan Yu
A recent measurement of the gravitational redshift was based on interference of matter waves. Operation in microgravity can improve it by a factor of and, in some models, ev…
Inter-Residue Geometry Attention for Antibody-Specific Epitope Prediction
Chuanliu Fan, Nan Yu, Junjie Wu +1
Antibody-specific epitope prediction aims to identify which antigen residues are recognized by a given antibody, a task that depends on the three-dimensional complementarity betwee…
Additive manufacturing in ceramics: targeting lightweight mirror applications in the visible, ultraviolet and X-ray
Carolyn Atkins, Younes Chahid, Gregory Lister +12
Additive manufacturing (AM; 3D printing) has clear benefits in the production of lightweight mirrors for astronomy: it can create optimised lightweight structures and combine multi…
Joint POS Tagging and Dependency Parsing with Transition-based Neural Networks
Liner Yang, Meishan Zhang, Yang Liu +3
While part-of-speech (POS) tagging and dependency parsing are observed to be closely related, existing work on joint modeling with manually crafted feature templates suffers from t…
A Planar Tracking Game with Sensing Delays and its MATLAB Implementation
Nan Yu, Chifu Yang, Miao Li
This paper proposes a new perspective on the conventional planar target tracking problem. One evader and one pursuer are considered in the dynamics. In the planar tracking, pursuer…
Finite element modeling of coupled optical microdisk resonators for displacement sensing
Ivan Grudinin, Nan Yu
We analyze normal mode splitting in a pair of vertically coupled microdisk resonators. A full vectorial finite element model is used to find the eigen frequencies of the symmetric…
Searching for stochastic background of ultra-light fields with atomic sensors
Tigran Kalaydzhyan, Nan Yu
We propose a cross-correlation method for the searches of ultra-light fields, in particular, with a space network of atomic sensors. The main motivation of the approach is cancella…
Quantum Test of the Equivalence Principle and Space-Time aboard the International Space Station
Jason Williams, Sheng-wey Chiow, Holger Mueller +1
We describe the Quantum Test of the Equivalence principle and Space Time (QTEST), a concept for an atom interferometry mission on the International Space Station (ISS). The primary…