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.
Zhang
Jun
J
Department of Electrical Engineering and Computer Sciences, Department of Chemistry, Pitzer Center for Theoretical Chemistry, University of California, Berkeley, California 94720, USA
Vala
Jiri
J
Sastry
Shankar
S
Whaley
K Birgitta
KB