Table 2 The Holevo variance for different schemes
From: Experimental optical phase measurement approaching the exact Heisenberg limit
Symmetric entanglement | Multipass | Adaptive measurement | V H |
|---|---|---|---|
✓ | ✓ | ✓ | 0.5278 |
✓ | ✓ | ✓ | 0.5497(7) (Exp.) |
✓ | ✗ | ✓ | 0.556926 |
✗ | ✓ | ✓ | 0.5609 |
✓ | ✓ | ✗ | 0.6547 |
✗ | ✗ | ✗ | 0.7778 |
✗ | ✗ | ✗ | 0.7870(7) (Exp.) |
