TY  - JOUR
AU  - Mehl, Sebastian
AU  - DiVincenzo, David
TI  - Simple operation sequences to couple and interchange quantum information between spin qubits of different kinds
JO  - Physical review / B
VL  - 92
IS  - 11
SN  - 1098-0121
CY  - College Park, Md.
PB  - APS
M1  - FZJ-2015-06201
SP  - 115448
PY  - 2015
AB  - Efficient operation sequences to couple and interchange quantum information between quantum dot spin qubits of different kinds are derived using exchange interactions. In the qubit encoding of a single-spin qubit, a singlet-triplet qubit, and an exchange-only (triple-dot) qubit, some of the single-qubit interactions remain on during the entangling operation; this greatly simplifies the operation sequences that construct entangling operations. In the ideal setup, the gate operations use the intraqubit exchange interactions only once, and entangling operations with gate times similar to typical single-qubit operations are constructed. The limitations of the entangling sequences are discussed, and it is shown how quantum information can be converted between different kinds of quantum dot spin qubits. These gate sequences are useful for large-scale quantum computation because they show that different kinds of coded spin qubits can be combined easily, permitting the favorable physical properties of each to be employed.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000362084800004
DO  - DOI:10.1103/PhysRevB.92.115448
UR  - https://juser.fz-juelich.de/record/256229
ER  -