%0 Journal Article
%A Zeuch, D.
%A Bonesteel, N. E.
%T Efficient two-qubit pulse sequences beyond CNOT
%J Physical review / B
%V 102
%N 7
%@ 2469-9950
%C Woodbury, NY
%I Inst.
%M FZJ-2020-04868
%P 075311
%D 2020
%X We design efficient controlled-rotation gates with arbitrary angle acting on three-spin encoded qubits for exchange-only quantum computation. Two pulse sequence constructions are given. The first is motivated by an analytic derivation of the efficient Fong-Wandzura sequence for an exact cnot gate. This derivation, briefly reviewed here, is based on elevating short sequences of swap pulses to an entangling two-qubit gate. To go beyond cnot, we apply a similar elevation to a modified short sequence consisting of swaps and one pulse of arbitrary duration. This results in two-qubit sequences that carry out controlled-rotation gates of arbitrary angle. The second construction streamlines a class of arbitrary cphase gates established earlier. Both constructions are based on building two-qubit sequences out of subsequences with special properties that render each step of the construction analytically tractable.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000562629100003
%R 10.1103/PhysRevB.102.075311
%U https://juser.fz-juelich.de/record/888362