Abstract
The two-qubit interaction Hamiltonian of a given physical implementation determines whether or not a two-qubit gate such as the controlled-NOT (CNOT) gate can be realized easily. It can be shown that, e.g., with the interaction more than one two-qubit operation is required in order to realize the CNOT operation. Here we propose a two-qubit gate for the interaction which combines the CNOT and SWAP operations. By using this gate quantum circuits can be implemented efficiently, even if only nearest-neighbor coupling between the qubits is available.
- Received 30 July 2002
DOI:https://doi.org/10.1103/PhysRevA.67.032301
©2003 American Physical Society