Rights statement: © 2016 American Physical Society
Accepted author manuscript, 5.97 MB, PDF document
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Final published version
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Arbitrary qubit transformations on tuneable Rashba rings
AU - Kregar, A.
AU - Jefferson, John Henry
AU - Ramšak, A.
N1 - © 2016 American Physical Society
PY - 2016/2/23
Y1 - 2016/2/23
N2 - An exact solution is presented for the time-dependent wave function of an initial ground-state Kramers-doublet qubit that is driven around a quantum ring. We show that the initial qubit may be transformed to an arbitrary point on the Bloch sphere for an integral number of revolutions around the ring. Full coverage of the Bloch sphere is achieved by dividing the total rotation into segments, changing the rotation axis after each segment by an adiabatic shift in the Rashba spin-orbit interaction. Prospects and challenges for possible realizations are discussed for which rings based on InAs quantum wires are promising candidates.
AB - An exact solution is presented for the time-dependent wave function of an initial ground-state Kramers-doublet qubit that is driven around a quantum ring. We show that the initial qubit may be transformed to an arbitrary point on the Bloch sphere for an integral number of revolutions around the ring. Full coverage of the Bloch sphere is achieved by dividing the total rotation into segments, changing the rotation axis after each segment by an adiabatic shift in the Rashba spin-orbit interaction. Prospects and challenges for possible realizations are discussed for which rings based on InAs quantum wires are promising candidates.
U2 - 10.1103/PhysRevB.93.075432
DO - 10.1103/PhysRevB.93.075432
M3 - Journal article
VL - 93
JO - Physical review B
JF - Physical review B
SN - 1098-0121
IS - 7
M1 - 075432
ER -