TY  - JOUR
AU  - Zeuch, D.
AU  - Bonesteel, N. E.
TI  - Efficient two-qubit pulse sequences beyond CNOT
JO  - Physical review / B
VL  - 102
IS  - 7
SN  - 2469-9950
CY  - Woodbury, NY
PB  - Inst.
M1  - FZJ-2020-04868
SP  - 075311
PY  - 2020
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000562629100003
DO  - DOI:10.1103/PhysRevB.102.075311
UR  - https://juser.fz-juelich.de/record/888362
ER  -