Composite Gates

Composite gates are gates that expand into a set of gates and therefore all composite gates can be constructed manually. However, particularly in the case of the CONJUGATE gate, composite gates are much easier to use.

• CNOTChain: This composite gate creates a chain of CNOT gates linking the qubits in the target_qubits. For example, this CNOTChain gate...

  { 
      "gate_type": "CNOTChain",
      "target_qubits": [0, 2, 3]
  }
  

  ...would expand to:

  [
      { 
          "gate_type": "CNOT",
          "control_qubits": [0],
          "target_qubits": [2]
      },
      { 
          "gate_type": "CNOT",
          "control_qubits": [2],
          "target_qubits": [3]
      }
  ]
  

• CONJUGATE: This gate will:

  1. Apply all the gates in the within_gates array in the gate object.
  2. Apply all the gates in the apply_gates array in the gate object.
  3. Apply the adjoint of all gates in the within_gates in the opposite order they were applied.

  For example, this CONJUGATE gate...

  { 
      "comment": "****** 110 => 1 ******",
      "gate_type": "CONJUGATE",
      "within_gates": [
          {   
              "gate_type": "X",
              "target_qubits": [2]
          }
      ],
      "apply_gates": [
          { 
              "gate_type": "X",
              "control_qubits": [0, 1, 2],
              "target_qubits": [3]
          }
      ]
  }
  

  ...would expand to:

  [
      {   
          "gate_type": "X",
          "target_qubits": [2]
      },
      { 
          "gate_type": "X",
          "control_qubits": [0, 1, 2],
          "target_qubits": [3]
      },
      {   
          "gate_type": "X",
          "target_qubits": [2],
          "adjoint": true
      }
  ]