2002/09/30 by Norbert Schuch, Jens Siewert · 1 citation
Physics and Astronomy · #quant-ph #cond-mat
paper · pdf · doi:10.1103/physreva.67.032301
published as Phys. Rev. A 67, 032301 (2003) · 8 pages, REVTeX4; published version (minor changes, Appendix B added)
arxiv created 2003/04/04 · arxiv updated 2009/11/30
The two-qubit interaction Hamiltonian of a given physical implementation determines whether or not a two-qubit gate such as the CNOT gate can be realized easily. It can be shown that, e.g., with the XY interaction more than one two-qubit operation is required in order to realize CNOT. Here we propose a two-qubit gate for the XY interaction which combines CNOT with the SWAP operation. By using this gate quantum circuits can be implemented efficiently, even if only nearest-neighbor coupling between the qubits is available.