UNIVERSITY OF CALGARY An Atomic Source of Quantum Light
Bibliographic record
Abstract
This thesis presents the experimental demonstration of an atomic source of narrowband nonclassical states of light. Employing four-wave mixing in hot atomic Rubidium vapour, the optical states produced are naturally compatible with atomic transitions and may be thus employed in atom-based quantum communication protocols. We first demonstrate the production of two-mode intensity-squeezed light and ana-lyze the correlations between the two produced modes. Using homodyne detection in each mode, we verify the production of two-mode quadrature-squeezed light, achieving a reduction in quadrature variance of 3 dB below the standard quantum limit. Employing conditional detection on one of the channels, we then demonstrate the generation of single-photon Fock states as well as controllable superpositions of vacuum and 1-photon states. We fully characterize the produced light by means of optical homo-dyne tomography and maximum likelihood estimation. The narrowband nature of the produced light yields a resolvable temporal wave-function, and we develop a method to infer this wave function from the continuous photocurrent provided by the homodyne detector. The nature of the atomic process opens the door to a new direction of research: generation of arbitrary superpositions of collective atomic states. We perform the first proof-of-principle experiment towards this new field and discuss a proposal for extending this work to obtain full control over the collective-atomic Hilbert space. i ii
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.002 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.002 | 0.001 |
| Open science | 0.001 | 0.003 |
| Research integrity | 0.001 | 0.003 |
| Insufficient payload (model declined to judge) | 0.026 | 0.005 |
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.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
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".