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Figure 3 | EPJ Quantum Technology

Figure 3

From: Minimal ancilla mediated quantum computation

Figure 3

The fixed ancilla-register interaction L a j . (a) Decomposition into local and non-local parts. (b) The two-qubit entangling gate N k j is implemented on the register qubits j and k via the sequence of Eq. (13) with an ancilla initialised in the state |0, where the form of N k j is given in Eq. (14). This two-qubit gate is not symmetric with respect to the exchange of j and k. (c) The single-qubit gate v i =R( θ i + θ a )uR( θ i + θ r ) is applied to a register qubit j by two applications of L with an ancilla initialised in the state |i, i=0,1.

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