Quantum-limited discrimination of laser light and thermal light
| Autor: | Jonathan L. Habif, Samuel Gartenstein, Saikat Guha, Phoebe Amory, Arunkumar Jagannathan |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Physics
Quantum Physics business.industry Single-mode optical fiber FOS: Physical sciences 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Atomic and Molecular Physics and Optics 010309 optics Optics Homodyne detection 0103 physical sciences Coherent states Limit (mathematics) Heterodyne detection Quantum Physics (quant-ph) 0210 nano-technology business Sensitivity (electronics) Quantum Free-space optical communication |
| Zdroj: | Optics express. 29(5) |
| ISSN: | 1094-4087 |
| Popis: | Understanding the fundamental sensitivity limit of an optical sensor requires a full quantum mechanical description of the sensing task. In this work, we calculate the fundamental (quantum) limit for discriminating between pure laser light and thermal noise in a photon-starved regime. The Helstrom bound for discrimination error probability for single mode measurement is computed along with error probability bounds for direct detection, coherent homodyne detection and the Kennedy receiver. A generalized Kennedy (GK) receiver is shown to closely approach the Helstrom limit. We present an experimental demonstration of this sensing task and demonstrate $15.4$ dB improvement in discrimination sensitivity over direct detection using a GK receiver, and an improvement of $19.4\%$ in error probability over coherent detection. 7 pages, 3 figures |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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