David P. DiVincenzo, Michał Horodecki, et al.
Physical Review Letters
Paper
Five two-bit quantum gates are sufficient to implement the quantum Fredkin gate
Abstract
We present an analytic construction of the three-bit quantum conditional swap (Fredkin) gate that uses only five quantum gates, each acting on only two qubits. Our implementation is based on previous work on the three-bit quantum conditional-NOT (Toffoli) gate. Numerical evidence suggests that this is a minimal implementation. © 1996 The American Physical Society.
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