Rights statement: © 2017 American Physical Society
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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 - Hyperfine and spin-orbit coupling effects on decay of spin-valley states in a carbon nanotube
AU - Pei, T
AU - Pályi, A
AU - Mergenthaler, M
AU - Ares, N
AU - Mavalankar, A
AU - Warner, J H
AU - Briggs, G A D
AU - Laird, E A
N1 - © 2017 American Physical Society
PY - 2017/4/28
Y1 - 2017/4/28
N2 - The decay of spin-valley states is studied in a suspended carbon nanotube double quantum dot via leakage current in Pauli blockade and via dephasing and decoherence of a qubit. From the magnetic field dependence of the leakage current, hyperfine and spin-orbit contributions to relaxation from blocked to unblocked states are identified and explained quantitatively by means of a simple model. The observed qubit dephasing rate is consistent with the hyperfine coupling strength extracted from this model and inconsistent with dephasing from charge noise. However, the qubit coherence time, although longer than previously achieved, is probably still limited by charge noise in the device.
AB - The decay of spin-valley states is studied in a suspended carbon nanotube double quantum dot via leakage current in Pauli blockade and via dephasing and decoherence of a qubit. From the magnetic field dependence of the leakage current, hyperfine and spin-orbit contributions to relaxation from blocked to unblocked states are identified and explained quantitatively by means of a simple model. The observed qubit dephasing rate is consistent with the hyperfine coupling strength extracted from this model and inconsistent with dephasing from charge noise. However, the qubit coherence time, although longer than previously achieved, is probably still limited by charge noise in the device.
U2 - 10.1103/PhysRevLett.118.177701
DO - 10.1103/PhysRevLett.118.177701
M3 - Journal article
VL - 118
JO - Physical review letters
JF - Physical review letters
SN - 0031-9007
IS - 17
M1 - 177701
ER -