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Record W7126032962 · doi:10.1364/ls.2025.lm1f.1

Free-space optical time transfer for future femtosecond ground-to-satellite clock networks

2025· article· W7126032962 on OpenAlexaff
Emily D. Caldwell, Jean-Daniel Deschenes, W. S. Swann, Hugo Bergeron, Benjamin Stuhl, Jennifer Ellis, Ian Coddington, Laura C. Sinclair, Nathan R. Newbury

Bibliographic record

Venuenot available
Typearticle
Language
FieldPhysics and Astronomy
TopicAdvanced Frequency and Time Standards
Canadian institutionsActive Ethernet Passive Optical Networks Over λ MultipleXing (Canada)
Fundersnot available
KeywordsTime transferFemtosecondTransfer (computing)Optical communicationData transmissionUltrafast optics

Abstract

fetched live from OpenAlex

Leveraging the time programmable frequency comb, recent demonstrations of free-space optical time transfer show femtosecond time transfer and sub 10 -18 -level frequency transfer across 300 km of air at losses expected for ground-to-space optical links.

Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.

How this classification was reachedexpand

Full frame distilled prediction

Teacher imitation

Not calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.

metaresearch head score (Codex)0.000
metaresearch head score (Gemma)0.000
Version: codex-gemma-dda1882f352aValidation status: machine_predicted_unvalidated
Candidate categoriesMeta-epidemiology (narrow), Insufficient payload (model declined to judge)
Consensus categoriesnone
DomainCandidate signal: none · Consensus signal: none
Study designCandidate signal: Not applicable · Consensus signal: none
GenreCandidate signal: Methods · Consensus signal: none
Teacher disagreement score0.909
Threshold uncertainty score0.999

Codex and Gemma teacher scores by category

CategoryCodexGemma
Metaresearch0.0000.000
Meta-epidemiology (narrow)0.0010.001
Meta-epidemiology (broad)0.0010.001
Bibliometrics0.0000.001
Science and technology studies0.0010.000
Scholarly communication0.0000.000
Open science0.0010.000
Research integrity0.0000.001
Insufficient payload (model declined to judge)0.0060.000

Machine scores (provisional)

The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.

Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.

Opus teacher head0.005
GPT teacher head0.243
Teacher spread0.239 · how far apart the two teachers sit on this one work
Validation statusscore_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it

Classification

machine, unvalidated

Machine predicted; a candidate call from one teacher head, not a consensus.

Study designNot applicable
Domainnot available
GenreMethods

How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".

Quick stats

Citations0
Published2025
Admission routes1
Has abstractyes

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