Quantitative loss budget analysis for single-photon detection at 737 nm in diamond quantum photonics
| Source | Category | Transmission | Loss [dB] |
|---|---|---|---|
| Fiber NA matching | Fiber | 0.118 | 9.30 |
| Detector base QE | Detector | 0.600 | 2.22 |
| Objective | Optical | 0.850 | 0.71 |
| Bandpass filter | Optical | 0.900 | 0.46 |
| Dichroic | Optical | 0.920 | 0.36 |
| Polarizer | Optical | 0.920 | 0.36 |
| Connector/prop. | Fiber | 0.931 | 0.31 |
| Strategy | Improved eta | Improvement | Cost |
|---|---|---|---|
| Free-space detection | 32.1% | +883% | Medium |
| SNSPD upgrade | 5.1% | +55% | High |
| Improved alignment | 3.4% | +3.9% | Low |
| AR coatings | 3.3% | +2.4% | Medium |
| Fewer mirrors | 3.3% | +1.0% | Low |