Coupling spin qubits via superconductors
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Coupling spin qubits via superconductors. / Leijnse, Martin; Flensberg, Karsten.
In: Physical Review Letters, Vol. 111, No. 6, 060501, 06.08.2013.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Coupling spin qubits via superconductors
AU - Leijnse, Martin
AU - Flensberg, Karsten
PY - 2013/8/6
Y1 - 2013/8/6
N2 - We show how superconductors can be used to couple, initialize, and read out spatially separated spin qubits. When two single-electron quantum dots are tunnel coupled to the same superconductor, the singlet component of the two-electron state partially leaks into the superconductor via crossed Andreev reflection. This induces a gate-controlled singlet-triplet splitting which, with an appropriate superconductor geometry, remains large for dot separations within the superconducting coherence length. Furthermore, we show that when two double-dot singlet-triplet qubits are tunnel coupled to a superconductor with finite charging energy, crossed Andreev reflection enables a strong two-qubit coupling over distances much larger than the coherence length.
AB - We show how superconductors can be used to couple, initialize, and read out spatially separated spin qubits. When two single-electron quantum dots are tunnel coupled to the same superconductor, the singlet component of the two-electron state partially leaks into the superconductor via crossed Andreev reflection. This induces a gate-controlled singlet-triplet splitting which, with an appropriate superconductor geometry, remains large for dot separations within the superconducting coherence length. Furthermore, we show that when two double-dot singlet-triplet qubits are tunnel coupled to a superconductor with finite charging energy, crossed Andreev reflection enables a strong two-qubit coupling over distances much larger than the coherence length.
U2 - 10.1103/PhysRevLett.111.060501
DO - 10.1103/PhysRevLett.111.060501
M3 - Journal article
C2 - 23971543
VL - 111
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 6
M1 - 060501
ER -
ID: 49889655