| Number of Gates | Number of Garbage | Quantum Cost |
Comparator proposed in [17] | 10 | 15 | 42 |
Previous Comparator [17] | 25 | 23 | Unknown |
Existing Comparator [24] | 16 | 17 | 50 |
Comparator using TR gate using Half subtraction method | 12 | 12 | 32 |
Comparator using TR gate using Full subtraction method | 9 | 9 | 49 |