Phys. Rev. Lett. 93, 130502 (2004) [4 pages]Quantum Circuits for General Multiqubit GatesReceived 7 May 2004; published 20 September 2004 We consider a generic elementary gate sequence which is needed to implement a general quantum gate acting on n qubits—a unitary transformation with 4n degrees of freedom. For synthesizing the gate sequence, a method based on the so-called cosine-sine matrix decomposition is presented. The result is optimal in the number of elementary one-qubit gates, 4n, and scales more favorably than the previously reported decompositions requiring 4n-2n+1 controlled NOT gates. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.93.130502
DOI:
10.1103/PhysRevLett.93.130502
PACS:
03.67.Lx
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