Minimum construction of two-qubit quantum operations.
Optimal construction of quantum operations is a fundamental problem in the realization of quantum computation. We here introduce a newly discovered quantum gate, B, that can implement any arbitrary two-qubit quantum operation with minimal number of both two- and single-qubit gates. We show this by giving an analytic circuit that implements a generic nonlocal two-qubit operation from just two applications of the B gate. Realization of the B gate is illustrated with an example of charge-coupled superconducting qubits for which the B gate is seen to be generated in shorter time than the CNOT gate.
Department of Electrical Engineering and Computer Sciences, Department of Chemistry, Pitzer Center for Theoretical Chemistry, University of California, Berkeley, California 94720, USA
Jun
J
Zhang
Jiri
J
Vala
Shankar
S
Sastry
K Birgitta
KB
Whaley