Conditions for optimal construction of two-qubit non-local gates

Details Conditions for optimal construction of two-qubit non-local gates Conditions for optimal construction of two-qubit non-local gates

2004-11-09

arxiv.org/abs/quant-ph/0411058v1

Phys. Rev. A 71, 062331 (2005)

Physics

Quantum Physics

5 pages, 1 figure

Scientific paper

10.1103/PhysRevA.71.062331

Optimal implementation of quantum gates is crucial for designing a quantum computer. The necessary condition for optimal construction of a two-qubit unitary operation is obtained. It can be proved that the B gate is the unique gate that can construct a two-qubit universal circuit with only two applications, i.e. this condition is also sufficient in the case of two applications of the elementary two-qubit gate. It is also shown that one half of perfect entanglers can not simulate an arbitrary two-qubit gate with only 3 applications.

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